Silicone foam control composition

Claim 2

A composition consisting essentially of: (I) a silicone defoamer reaction product prepared by reacting at a temperature of 50° C. to 300° C., and in the presence of a catalytic amount of an equilibration catalyst for promoting the reaction, said catalyst being selected from alkali metal hydroxides, alkali metal silanolates, alkali metal alkoxides, quaternary ammonium hydroxides, and quaternary ammonium silanolates, (i) 100 parts by weight of at least one polyorganosiloxane selected from the group consisting of (A) a polyorganosiloxane having a viscosity of about 20 to 100,000 cS at 25° C. and being expressed by the general formula R 1 a SiO.sub.(4-a)/2 in which R 1 is a monovalent hydrocarbon or halogenated hydrocarbon group having 1 to 10 carbon atoms and a has an average value of 1.9 to 2.2 and (B) a polyorganosiloxane having a viscosity of 200 to about 100 million cS at 25° C. expressed by the general formula R 2 b (R 3 O) c SiO.sub.(4-b-c)/2 in which R 2 is a monovalent hydrocarbon or halogenated hydrocarbon group having 1 to 10 carbon atoms, R 3 is hydrogen or a monovalent hydrocarbon group having 1 to 10 carbon atoms, b has an average value of 1.9 to 2.2 and c has a sufficiently large value to give at least one --OR 3 group in each molecule, said --OR 3 group being present at least at the end of a molecular chain; (ii) 0.5 to 20 parts by weight of at least one resinous silicon compound selected from the group consisting of (a) an organosilicon compound of the general formula R 4 d SiX 4-4 in which R 4 is a monovalent hydrocarbon group having 1 to 5 carbon atoms, X is a hydrolyzable group and d has an average value of one or less, (b) a partially hydrolyzed condensate of said compound (a), (c) a siloxane resin consisting essentially of (CH 3 ) 3 SiO 1/2 units and SiO 4/2 units wherein the ration of (CH 3 ) 3 SiO 1/2 units to SiO 4/2 units is 0.4:1 to 1.2:1, and (d) a condensate of said compound (c) with said compound (a) or (b); and (iii) 0.5 to 30 parts by weight of a finely divided filler and (II) from about 20 to 200 parts by weight for each 100 parts by weight of said silicone defoamer reaction product (I) of a silicone-glycol copolymer having the average general formula ##STR6## wherein R 1 has been previously defined, Q is R 1 or G, j has a value of 1 to about 25, k has a value of 0 to about 200 and G is a polyoxyalkylene group having the average structure ##STR7## in which R is a divalent hydrocarbon group having 2 to about 20 carbon atoms, m has a value of about 7 to about 24, n has a value of 0 to about 24 and Z is selected from the group consisting of hydrogen, an alkyl radical having 1 to 6 carbon atoms and an acyl group having 2 to 6 carbon atoms.

Claim 3

The composition according to claim 1, wherein j is 1 to about 20, k is 0 to about 100 and said resinous silicon compound (ii) is selected from the group consisting of said partially hydrolyzed condensate (b), said siloxane resin (c) and said condensate (d).

Claim 4

The composition according to claim 2, wherein said silicone defoamer reaction product (I) additionally contains up to 20 parts by weight of: (v) a polyorganosiloxane having a viscosity of 5 to 200 cS at 25° C. and being expressed by the general formula R 6 e (R 9 O) f SiO 4-e-f )/2 in which R 6 is a monovalent hydrocarbon or halogenated hydrocarbon group having 1 to 10 carbon atoms, R 9 is hydrogen or a monovalent hydrocarbon group having 1 to 10 carbon atoms, e is from 1.9 to 2.2 and f has a sufficiently large value to give at least two --OR 9 groups in each molecule at the end of a molecular chain.

Claim 5

The composition according to claim 3, wherein said polyorganosiloxane (A) is a trimethylsilyl-terminated polydimethylsiloxane having a viscosity of about 350 to 15,000 cS at 25° C., said polyorganosiloxane (B) is a hydroxyl-terminated polydimethylsiloxane having a viscosity of about 1,000 to 50,000 cS at 25° C., said polyorganosiloxane (v) is a hydroxyl-terminated polydimethylsiloxane having a viscosity of about 10 to 50 cS at 25° C. and wherein R 1 is a methyl radical.

Claim 6

The composition according to claim 4, further comprising from about 1 to 15 parts by weight for each 100 parts by weight of said silicone defoamer reaction product (I) of: (III) a finely divided filler.

Claim 7

The composition according to claim 5, wherein said finely divided filler (iii) and said finely divided filler (III) are each silica and said resinous silicon compound (ii) is selected from the group consisting of alkyl polysilicates in which the alkyl group has 1 to 5 carbon atoms and said siloxane resin (c).

Claim 8

The composition according to claim 6, further comprising from about 10 to 100 parts by weight for each 100 parts by weight of said silicone defoamer reaction product (I) of: (IV) at least one polyorganosiloxane selected from the group consisting of a trimethylsilyl-terminated polydimethylsiloxane having a viscosity of about 2 to 100 cS at 25° C. and a trimethylsilyl-terminated polydimethylsiloxane having a viscosity of about 150 to 100,000 cS at 25° C.

Claim 9

The composition according to claim 4, wherein said resinous silicon compound (ii) is selected from the group consisting of alkyl polysilicates in which the alkyl group has 1 to 5 carbon atoms and said siloxane resin (c).

Claim 10

The composition according to claim 8, further comprising from about 10 to 100 parts by weight for each 100 parts by weight of said silicone defoamer reaction product (I) of: (IV) at least one polyorganosiloxane selected from the group consisting of a trimethylsilyl-terminated polydimethylsiloxane having a viscosity of about 2 to 100 cS at 25° C. and a trimethylsilyl-terminated polydimethylsiloxane having a viscosity of about 150 to 100,000 cS at 25° C.

Claim 11

The composition according to claim 2, wherein said polyorganosiloxane (A) is a trimethylsilyl-terminated polydimethylsiloxane having a viscosity of about 350 to 15,000 cS at 25° C., said polyorganosiloxane (B) is a hydroxyl-terminated polydimethylsiloxane having a viscosity of about 1,000 to 50,000 cS at 25° C., and wherein R 1 is a methyl radical.

Claim 12

The composition according to claim 1, further comprising from about 1 to 15 parts by weight for each 100 parts by weight of said silicone defoamer reaction product (I) of: (III) a finely divided filler.

Claim 13

The composition according to claim 11, wherein said finely divided filler (iii) and said finely divided filler (III) are each silica and said resinous silicon compound (ii) is selected from the group consisting of alkyl polysilicates in which the alkyl group has 1 to 5 carbon atoms and said siloxane resin (c).

Claim 14

The composition according to claim 12, wherein said silicone glycol (II) has the formula ##STR8## wherein Me denotes a methyl radical, R is selected from the group consisting of trimethylene and isobutylene, j has a value of 1 to 10, k has a value of 0 to 100, m is 7 to 12, n is less than or equal to m, and wherein said resinous silicon compound (ii) is selected from the group consisting of ethyl polysilicate and a siloxane resin copolymer consisting essentially of (CH 3 ) 3 SiO 1/2 units and SiO 2 units in a molar ratio of approximately 0.75:1.

Claim 15

The composition according to claim 10, wherein said resinous silicon compound (ii) is selected from the group consisting of alkyl polysilicates in which the alkyl group has 1 to 5 carbon atoms and said siloxane resin (c), and said filler (iii) is silica.

Claim 16

In a process of controlling foam in an aqueous foaming system which includes the addition of a foam control agent to said system, the improvement comprising using as the foam control agent the composition of claim 1.

Claim 17

The process of claim 15, wherein said aqueous foaming system has a pH less than about 3.

Claim 18

The process of claim 15, wherein said aqueous foaming system is selected from the group consisting of phosphoric acid and sulphite process pulping media.

Claim 19

The process of claim 15, wherein said aqueous foaming system is a bauxite digestion medium.

Claim 20

In a process of controlling foam in an aqueous foaming system which includes the addition of a foam control agent to said system, the improvement comprising using as the foam control agent the composition of claim 2.

Claim 21

The process of claim 19, wherein said aqueous foaming system has a pH less than about 3.

Claim 22

The process of claim 19, wherein said aqueous foaming system is selected from the group consisting of phosphoric acid and sulphite proceee pulping media.

Claim 23

In a process of controlling foam in an aqueous foaming system which includes the addition of a foam control agent to said system, the improvement comprising using as the foam control agent the composition of claim 4.

Claim 24

In a process of controlling foam in an aqueous foaming system which includes the addition of a foam control agent to said system, the improvement comprising using as the foam control agent the composition of claim 7.

Claim 25

In a process of controlling foam in an aqueous foaming system which includes the addition of a foam control agent to said system, the improvement comprising using as the foam control agent the composition of claim 9.

Claim 26

In a process of controlling foam in an aqueous foaming system which includes the addition of a foam control agent to said system, the improvement comprising using as the foam control agent the composition of claim 10.

Claim 27

The process of claim 15, wherein said aqueous foaming system has a pH greater than about 12.

Claim 28

The process of claim 26, wherein said aqueous foaming system is a kraft process black liquor.

Claim 29

The process of claim 19, wherein said aqueous foaming system has a pH greater than about 12.

Claim 30

The process of claim 28, wherein said aqueous foaming system is a kraft process of black liquor.

Claim 31

In a process of controlling foam in an aqueous foaming system which includes the addition of a foam control agent to said system, the improvement comprising using as the foam control agent the composition of claim 13.

Claim 32

In a process of controlling foam in an aqueous foaming system which includes the addition of a foam control agent to said system, the improvement comprising using as the foam control agent the composition of claim 14.

Claim 33

In a process of controlling foam in a flexographic ink which includes the addition of a foam control agent to said system, the improvement comprising using as the foam control agent a composition consisting essentially of: (I) a silicone defoamer reaction product prepared by reacting at a temperature of 50° C. to 300° C., and in the presence of a catalytic amount of an equilibration catalyst for promoting the reaction, said catalyst being selected from alkali metal hydroxides, alkali metal silanolates, alkali metal alkoxides, quaternary ammonium hydroxides, and quaternary ammonium silanolates, (i) 100 parts by weight of at least one polyorganosiloxane selected from the group consisting of (A) a polyorganosiloxane having a viscosity of about 20 to 100,000 cS at 25° C. and being expressed by the general formula R 1 a SiO.sub.(4-a)/2 in which R 1 is a monovalent hydrocarbon or halogenated hydrocarbon group having 1 to 10 carbon atoms and a has an average value of 1.9 to 2.2 and (B) a polyorganosiloxane having a viscosity of 200 to about 100 million cS at 25° C. expressed by the general formual R 2 b (R 3 O) c SiO.sub.(4-b-c)/2 in which R 2 is a monovalent hydrocarbon or halogenated hydocarbon group having 1 to 10 carbon atoms, R 3 is hydrogen or a monovalent hydrocarbon group having 1 to 10 carbon atoms, b has an average value of 1.9 to 2.2 and c has a sufficiently large value to give at least one --OR 3 group in each molecule, said --OR 3 group being present at least at the end of a molecular chain; (ii) 0.5 to 20 parts by weight of at least one resinous silicon compound selected from the group consisting of (a) an organosilicon compound of the general formula R 4 d SiX 4-d in which R 4 is a monovalent hydrocarbon group having 1 to 5 carbon atoms, X is a hydrolyzable group and d has an average value of one or less, (b) a partially hydrolyzed condensate of said compound (a), (c) a siloxane resin consisting essentially of (CH 3 ) 3 SiO 1/2 units and SiO 4/2 units wherein the ratio of (CH 3 ) 3 SiO 1/2 units to SiO 4/2 units is 0.4:1 to 1.2:1, and (d) a condensate of said compound (c) with said compound (a) or (b); and (iii) 0.5 to 30 parts by weight of a finely divided filler and (II) from about 20 to 200 parts by weight for each 100 parts by weight of said silicone defoamer reaction product (I) of a silicone-glycol copolymer having the average general formula ##STR9## wherein R 1 has been previously defined, Q is R 1 or G, j has a value of 1 to about 150, k has a value of 0 to about 400 and G is a polyoxyalkylene group having the average structure ##STR10## in which R is a divalent hydrocarbon group having 2 to about 20 carbon atoms, m has a value of about 4 to about 50, n has a value of 0 to about 50 and Z is selected from the group consisting of hydrogen, an alkyl radical having 1 to 6 carbon atoms and an acyl group having 2 to 6 carbon atoms.

Claim 34

In a process of controlling foam in a flexographic ink which includes the addition of a foam control agent to said system, the improvement comprising using as the foam control agent a composition consisting essentially of: (I) a silicone defoamer reaction product prepared by reacting at a temperature of 50° C. to 300° C., and in the presence of a catalytic amount of an equilibration catalyst for promoting the reaction, said catalyst being selected from alkali metal hydroxides, alkali metal silanolates, alkali metal alkoxides, quaternary ammonium hydroxides, and quaternary ammonium silanolates, (i) 100 parts by weight of at least one polyorganosiloxane selected from the group consisting of (A) a polyorganosiloxane having a viscosity of about 20 to 100,000 cS at 25° C. and being expressed by the general formula R 1 a SiO.sub.(4-a)/2 in which R 1 is a monovalent hydrocarbon or halogenated hydrocarbon group having 1 to 10 carbon atoms and a has an average value of 1.9 to 2.2 and (B) a polyorganosiloxane having a viscosity of 200 to about 100 million cS at 25° C. expressed by the general formual R 2 b (R 3 O) c SiO.sub.(4-b-c)/2 in which R 2 is a monovalent hydrocarbon or halogenated hydocarbon group having 1 to 10 carbon atoms, R 3 is hydrogen or a monovalent hydrocarbon group having 1 to 10 carbon atoms, b has an average value of 1.9 to 2.2 and c has a sufficiently large value to give at least one --OR 3 group in each molecule, said --OR 3 group being present at least at the end of a molecular chain; (ii) 0.5 to 20 parts by weight of at least one resinous silicon compound selected from the group consisting of (a) an organosilicon compound of the general formula R 4 d SiX 4-d in which R 4 is a monovalent hydrocarbon group having 1 to 5 carbon atoms, X is a hydrolyzable group and d has an average value of one or less, (b) a partially hydrolyzed condensate of said compound (a), (c) a siloxane resin consisting essentially of (CH 3 ) 3 SiO 1/2 units and SiO 4/2 units wherein the ratio of (CH 3 ) 3 SiO 1/2 units to SiO 4/2 units is 0.4:1 to 1.2:1, and (d) a condensate of said compound (c) with said compound (a) or (b); and (iii) 0.5 to 30 parts by weight of a finely divided filler and (II) from about 20 to 200 parts by weight for each 100 parts by weight of said silicone defoamer reaction product (I) of a silicone-glycol copolymer having the average general formula ##STR9## wherein R 1 has been previously defined, Q is R 1 or G, j has a value of 1 to about 150, k has a value of 0 to about 400 and G is a polyoxyalkylene group having the average structure ##STR10## in which R is a divalent hydrocarbon group having 2 to about 20 carbon atoms, m has a value of about 4 to about 50, n has a value of 0 to about 50 and Z is selected from the group consisting of hydrogen, an alkyl radical having 1 to 6 carbon atoms and an acyl group having 2 to 6 carbon atoms.

Claim 35

A composition consisting essentially of: (I) a silicone defoamer reaction product prepared by reacting at a temperature of 50° C. to 300° C., and in the presence of a catalytic amount of an equilibration catalyst for promoting the reaction, said catalyst being selected from alkali metal hydroxides, alkali metal silonalates, alkali metal alkoxides, quaternary ammonium hydroxides, and quaternary ammonium silanolates, 100parts by weight of at least one polyorganosiloxane selected from the group consisting of (A) a trimethylsilyl-terminated polydimethylsiloxane having a viscosity of about 350 to 15,000 cS at 25° C. and being expressed by the general formula R 1 a SiO.sub.(4-a)/2 in which R 1 is a methyl radical and a has an average value of 1.9 to 2.2 and (B) a hydroxyl-terminated polydimethylsiloxane having a viscosity of about 1,000 to about 50,000 cS at 25° C. expressed by the general formula R 2 b (R 3 O) c SiO.sub.(4-b-c)/2 in which R 2 is a monovalent hydrocarbon or halogenated hydrocarbon group having 1 to 10 carbon atoms, R 3 is a hydrogen or a monovalent hydrocarbon group having 1 to 10 carbon atoms, b has an average value of 1.9 to 2.2 and C has a sufficiently large value to give at least one --OR 3 group in each molecule, said --OR 3 group being present at least at the end of a molecular chain; (ii) 0.5 to 20 parts by weight of a resinous silicon compound selected from the group consisting of ethyl polysilicate and a siloxane resin copolymer consisting essentially of (CH 3 ) 3 SiO 1/2 units and SiO 2 units in a molar ratio of approximately 0.75:1; and (iii) 0.5 to 30 parts by weight of silica; and (v) 0 to 20 parts by weight of hydroxyl-terminated polydimethylsiloxane having a viscosity of about 10 to 50 cS at 25° C. and being expressed by the general formula R 6 e (R 9 O) f SiO.sub.(4-e-f)/2 in which R 6 is a monovalent hydrocarbon or halogenated hydrocarbon group having 1 to 10 carbon atoms, R 9 is a hydrogen or a monovalent hydrocarbon group having 1 to 10 carbon atoms, e is from 1.9 to 2.2 and f has a sufficiently large value to give at least two --OR 9 groups in each molecule at the end of a molecular chain; and (II) from about 20 to 200 parts by weight for each 100 parts by weight of said silicone defoamer reaction product (I) of a silicone-glycol copolymer having the average general formula ##STR11## wherein Me denotes a methyl radical, R is selected from the group consisting of trimethylene and isobutylene, j has a value of 1 to 10, k has a value of 0 to 100, m is 7 to 12, n is less than or equal to m; and (III) about 1 to 15 parts by weight for each 100 parts by weight of said silicone defoamer reaction product (I) of silica.

Claim 36

A composition consisting essentially of: (I) a silicone defoamer reaction product prepared by reacting at a temperature of 50° C. to 300° C., and in the presence of a catalytic amount of an equilibration catalyst for promoting the reaction, said catalyst being selected from alkali metal hydroxides, alkali metal silonalates, alkali metal alkoxides, quaternary ammonium hydroxides, and quaternary ammonium silanolates, 100parts by weight of at least one polyorganosiloxane selected from the group consisting of (A) a trimethylsilyl-terminated polydimethylsiloxane having a viscosity of about 350 to 15,000 cS at 25° C. and being expressed by the general formula R 1 a SiO.sub.(4-a)/2 in which R 1 is a methyl radical and a has an average value of 1.9 to 2.2 and (B) a hydroxyl-terminated polydimethylsiloxane having a viscosity of about 1,000 to about 50,000 cS at 25° C. expressed by the general formula R 2 b (R 3 O) c SiO.sub.(4-b-c)/2 in which R 2 is a monovalent hydrocarbon or halogenated hydrocarbon group having 1 to 10 carbon atoms, R 3 is a hydrogen or a monovalent hydrocarbon group having 1 to 10 carbon atoms, b has an average value of 1.9 to 2.2 and C has a sufficiently large value to give at least one --OR 3 group in each molecule, said --OR 3 group being present at least at the end of a molecular chain; (ii) 0.5 to 20 parts by weight of a resinous silicon compound selected from the group consisting of ethyl polysilicate and a siloxane resin copolymer consisting essentially of (CH 3 ) 3 SiO 1/2 units and SiO 2 units in a molar ratio of approximately 0.75:1; and (iii) 0.5 to 30 parts by weight of silica; and (v) 0 to 20 parts by weight of hydroxyl-terminated polydimethylsiloxane having a viscosity of about 10 to 50 cS at 25° C. and being expressed by the general formula R 6 e (R 9 O) f SiO.sub.(4-e-f)/2 in which R 6 is a monovalent hydrocarbon or halogenated hydrocarbon group having 1 to 10 carbon atoms, R 9 is a hydrogen or a monovalent hydrocarbon group having 1 to 10 carbon atoms, e is from 1.9 to 2.2 and f has a sufficiently large value to give at least two --OR 9 groups in each molecule at the end of a molecular chain; and (II) from about 20 to 200 parts by weight for each 100 parts by weight of said silicone defoamer reaction product (I) of a silicone-glycol copolymer having the average general formula ##STR11## wherein Me denotes a methyl radical, R is selected from the group consisting of trimethylene and isobutylene, j has a value of 1 to 10, k has a value of 0 to 100, m is 7 to 12, n is less than or equal to m; and (III) about 1 to 15 parts by weight for each 100 parts by weight of said silicone defoamer reaction product (I) of silica.

Claim 37

A composition consisting essentially of: (I) a silicone defoamer reaction product prepared by reacting at a temperature of 50° C. to 300° C., and in the presence of a catalytic amount of an equilibration catalyst for promoting the reaction, said catalyst being selected from alkali metal hydroxides, alkali metal silanolates, alkali metal alkoxides, quaternary ammonium hydroxides, and quaternary ammonium silanolates, (i) 100 parts by weight of at least one polyorganosiloxane selected from the group consisting of (A) a trimethylsilyl-terminated polydimethylsiloxane having a viscosity of asbout 350 to 15,000 cS at 25° C. and being expressed by the general formula R 1 a SiO.sub.(4-a)/2 in which R 1 is a methyl radical and a has an average value of 1.9 to 2.2 and (B) a hydroxyl-terminated polydimethylsiloxane having a viscosity of about 1,000 to about 50,000 cS at 2520 C. expressed by the general formula R 2 b (R 3 O) c SiO 4-b-c )/2 in which R 2 is a monovalent hydrocarbonor halogenated hydrocarbon group having 1 to 10 carbon atoms, R 3 is hydrogen or a monovalent hydrocarbon group having 1 to 10 carbon atoms, b has an average value of 1.9 to 2.2 and c has a sufficiently large value to give at least one --OR 3 group in each molecule, said --OR 3 group being present at least at the end of a molecular chain; (ii) 0.5 to 20 parts by weightof a resinous silicon compound selected from the group consisting of ethyl polysilicate and a siloxane resin copolymer consisting essentially of (CH 3 ) 3 SiO 1/2 units and SiO 2 units in a molar ratio of approximately 0.75:1; and (iii) 0.5 to 30 parts byweight of a finely divided filler; and (v) 0 to 20 parts by weigt of a hydroxyl-terminated polydimethylsiloxane having a viscosityof about 10 to 50 cS at 25° C. and being expressed by the general formula R 6 e (R 9 O) f SiO.sub.(4-e-e)/2 in which R 6 is a monovalent hydrocarbon or halogenated hydrocarbon grouphaving 1 to 10 carbon atoms, R 9 is a hydrogen or a monovalent hydrocarbon group having 1 to10 carbon atoms, e is from 1.9 to 2.2 and f has a sufficiently large value to give at least two --OR 9 groups in each molecule at the end of a molecular chain; and (II) from about 20 to 200 parts by weightfor each 100 parts by weight of said silicone defoamer reaction product (I) of a silicone-glycol copolymer having the average general formula ##STR12## wherein Me denotes a methyl radical, R is selected from the group consisting of trimethylene and isobutylene, j has a value of 1 to 10, k has a value of 0 to 100, m is 7 to 12, n is less than or equal to m.

Claim 38

A composition consisting essentially of: (I) a silicone defoamer reaction product prepared by reacting at a temperature of 50° C. to 300° C., and in the presence of a catalytic amount of an equilibration catalyst for promoting the reaction, said catalyst being selected from alkali metal hydroxides, alkali metal silanolates, alkali metal alkoxides, quaternary ammonium hydroxides, and quaternary ammonium silanolates, (i) 100 parts by weight of at least one polyorganosiloxane selected from the group consisting of (A) a trimethylsilyl-terminated polydimethylsiloxane having a viscosity of asbout 350 to 15,000 cS at 25° C. and being expressed by the general formula R 1 a SiO.sub.(4-a)/2 in which R 1 is a methyl radical and a has an average value of 1.9 to 2.2 and (B) a hydroxyl-terminated polydimethylsiloxane having a viscosity of about 1,000 to about 50,000 cS at 2520 C. expressed by the general formula R 2 b (R 3 O) c SiO 4-b-c )/2 in which R 2 is a monovalent hydrocarbonor halogenated hydrocarbon group having 1 to 10 carbon atoms, R 3 is hydrogen or a monovalent hydrocarbon group having 1 to 10 carbon atoms, b has an average value of 1.9 to 2.2 and c has a sufficiently large value to give at least one --OR 3 group in each molecule, said --OR 3 group being present at least at the end of a molecular chain; (ii) 0.5 to 20 parts by weightof a resinous silicon compound selected from the group consisting of ethyl polysilicate and a siloxane resin copolymer consisting essentially of (CH 3 ) 3 SiO 1/2 units and SiO 2 units in a molar ratio of approximately 0.75:1; and (iii) 0.5 to 30 parts byweight of a finely divided filler; and (v) 0 to 20 parts by weigt of a hydroxyl-terminated polydimethylsiloxane having a viscosityof about 10 to 50 cS at 25° C. and being expressed by the general formula R 6 e (R 9 O) f SiO.sub.(4-e-e)/2 in which R 6 is a monovalent hydrocarbon or halogenated hydrocarbon grouphaving 1 to 10 carbon atoms, R 9 is a hydrogen or a monovalent hydrocarbon group having 1 to10 carbon atoms, e is from 1.9 to 2.2 and f has a sufficiently large value to give at least two --OR 9 groups in each molecule at the end of a molecular chain; and (II) from about 20 to 200 parts by weightfor each 100 parts by weight of said silicone defoamer reaction product (I) of a silicone-glycol copolymer having the average general formula ##STR12## wherein Me denotes a methyl radical, R is selected from the group consisting of trimethylene and isobutylene, j has a value of 1 to 10, k has a value of 0 to 100, m is 7 to 12, n is less than or equal to m.

Claim 39

A composition consisting essentially of: (I) a silicone defoamer reaction product prepared by reacting at a temperature of 50° C. to 300° C., and in the presence of a catalytic amount of an equilibration catalyst for promoting the reaction, said catalyst being selected from alkali metal hydroxides, alkali metal silanolates, alkali metal alkoxides, quaternary ammonium hydroxides, and quaternary ammonium silanolates, (i) 100 parts by weight of at least one polyorganosiloxane selected from the group consisting of (A) a trimethylsilyl-terminated polydimethylsiloxane having a viscosity of about 350 to 15,000 cS at 25° C. and being expressed by the general formula R 1 a SiO.sub.(4-a)/2 in which R 1 is a methyl radical and a has an average value of 1.9 to 2.2 and (B) a hydroxyl-terminated polydimethylsiloxane having a viscosity of about 1,000 to about 50,000 cS at 25° C. expressed by the general formula R 2 b R 3 O) c SiO.sub.(4-b-)/2 in which R 2 is a monovalent hydrocarbon or halogenated hydrocarbon group having 1 to 10 carbon atoms, R 3 is hydrogen or a monovalent hydrocarbon group having 1 to 10 carbon atoms, b has an average value of 1.9 to 2.2 and c has a sufficiently large value to give at least one --OR 3 group in each molecule, said --OR 3 group being present at least at the end of a molecular chain; (ii) 0.5 to20 parts by weight of a resinous silicon compound selected from the group consisting of ethyl polysilicate and a siloxane resin copolymer consisting essentially of (CH 3 ) 3 SiO 1/2 units and SiO 2 units in a molar ratio of approximately 0.75:1; and (iii) 0.5 to 30 parts by weight of silica; and (II) from about 20 200 parts by weight for each 100 parts by weight of said silicone defoamer reaction product (I) of a silicone-glycol copolymer having the average general formula ##STR13## wherein Me denotes a methyl radical, R is selected from the group consisting of trimethylene and isobutylene, j has a value of 1 to 10, k has a value of 0 to 100, m is 7 to 12, n is less than or equal to m.

Claim 40

A composition consisting essentially of: (I) a silicone defoamer reaction product prepared by reacting at a temperature of 50° C. to 300° C., and in the presence of a catalytic amount of an equilibration catalyst for promoting the reaction, said catalyst being selected from alkali metal hydroxides, alkali metal silanolates, alkali metal alkoxides, quaternary ammonium hydroxides, and quaternary ammonium silanolates, (i) 100 parts by weight of at least one polyorganosiloxane selected from the group consisting of (A) a trimethylsilyl-terminated polydimethylsiloxane having a viscosity of about 350 to 15,000 cS at 25° C. and being expressed by the general formula R 1 a SiO.sub.(4-a)/2 in which R 1 is a methyl radical and a has an average value of 1.9 to 2.2 and (B) a hydroxyl-terminated polydimethylsiloxane having a viscosity of about 1,000 to about 50,000 cS at 25° C. expressed by the general formula R 2 b R 3 O) c SiO.sub.(4-b-)/2 in which R 2 is a monovalent hydrocarbon or halogenated hydrocarbon group having 1 to 10 carbon atoms, R 3 is hydrogen or a monovalent hydrocarbon group having 1 to 10 carbon atoms, b has an average value of 1.9 to 2.2 and c has a sufficiently large value to give at least one --OR 3 group in each molecule, said --OR 3 group being present at least at the end of a molecular chain; (ii) 0.5 to20 parts by weight of a resinous silicon compound selected from the group consisting of ethyl polysilicate and a siloxane resin copolymer consisting essentially of (CH 3 ) 3 SiO 1/2 units and SiO 2 units in a molar ratio of approximately 0.75:1; and (iii) 0.5 to 30 parts by weight of silica; and (II) from about 20 200 parts by weight for each 100 parts by weight of said silicone defoamer reaction product (I) of a silicone-glycol copolymer having the average general formula ##STR13## wherein Me denotes a methyl radical, R is selected from the group consisting of trimethylene and isobutylene, j has a value of 1 to 10, k has a value of 0 to 100, m is 7 to 12, n is less than or equal to m.

Claim 41

In a process of controlling foam in an aqueous foaming system which includes the addition of a foam control agent to said system, the improvement comprising using as the foam control agent the composition of claim 33.

Claim 42

The process of claim 36, wherein said aqueous foaming system has a pH greater and about 12.

Claim 43

In a process of controlling foam in an aqueous foaming system which includes the addition of a foam control agent to said system, the improvement comprising using as the foam control agent the composition of claim 34.

Claim 44

In a process of controlling foam in an aqueous foaming system which includes the addition of a form control agent to said system, the improvement comprising using as the foam control agent the composition of claim 35.

Claim 45

The process of claim 22, wherein said aqueous foaming system has a pH greater than about 12.