Foam control composition

Claim 2

A composition which consists essentially of 1. 50 to 98.9 percent by weight of a base oil selected from the group consisting of polyoxypropylene polymers and polyoxypropylene-polyoxyethylene copolymers having molecular weights in the range of 500 to 6000, and siloxane glycol copolymers having the general formulae (a) R.sub.a Si {(OSiMe.sub.2).sub.n (OSiMeG).sub.b OSiMe.sub.2 G}.sub.4.sub.-a, (b) R.sub.a Si {(OSiMe.sub.2).sub.n (OSiMeG).sub.c OSiMe.sub.3 }.sub.4.sub.-a, (c) GMe.sub.2 Si(OSiMe.sub.2).sub.n (OSiMeG).sub.b OSiMe.sub.2 G, and (d) Me.sub.3 Si(OSiMe.sub.2).sub.n (OSiMeG).sub.c OSiMe.sub.3 in which formulae R is a hydrocarbon radical free of aliphatic unsaturation and contains from 1 to 10 carbon atoms, Me is a methyl radical, G is a radical of the structure --D(OR') m A wherein D is an alkylene radical containing from 1 to 30 carbon atoms, R' is an alkylene radical containing from 2 to 10 carbon atoms, m has a value of at least 1, and A is a capping group, a has a value of 0 or 1, n has a value of at least 12, b has a value of 0 to 50, and c has a value of 1 to 50, 2.

Claim 3

1 to 40 percent by weight of a foam control agent which consists essentially of 88 to 95 parts by weight of a liquid polydimethylsiloxane having a viscosity of at least 20 centistokes at 25°C., 5 to 10 parts by weight of silica, and 0 to 2 parts by weight of a siloxane resin consisting essentially of SiO 2 units and (CH 3 ) 3 SiO 1/2 units the ratio of the SiO 2 units to the (CH 3 ) 3 SiO 1/2 units being in the range of 1:0.4 to 1:1.2, and 3. 0.1 to 10 percent by weight of a dispersing agent which maintains (2) dispersed in (1) and which is a siloxane copolymer selected from the group consisting of i. polydimethylsiloxane-organic copolymers in which the polydimethylsiloxane portion has a molecular weight of at least 2000 and the organic portion consists essentially of a polyoxypropylene polymer having a molecular weight of at least 800 or a polyoxyethylene-polyoxypropylene copolymer having a molecular weight of at least 1500, said organic portion being attached to silicon atoms via silicon-carbon bonds, and ii. polydimethylsiloxane-organic copolymers which are the reaction products produced by heating a mixture of a polydimethylsiloxane containing silicon bonded hydrogen atoms having a molecular weight of at least 1500 and a hydroxylated polyoxypropylene having a molecular weight of at least 800 or a hydroxylated polyoxyethylene-polyoxypropylene copolymer having a

Claim 4

1 to 40 percent by weight of a foam control agent which consists essentially of 88 to 95 parts by weight of a liquid polydimethylsiloxane having a viscosity of at least 20 centistokes at 25°C., 5 to 10 parts by weight of silica, and 0 to 2 parts by weight of a siloxane resin consisting essentially of SiO 2 units and (CH 3 ) 3 SiO 1/2 units the ratio of the SiO 2 units to the (CH 3 ) 3 SiO 1/2 units being in the range of 1:0.4 to 1:1.2, and 3. 0.1 to 10 percent by weight of a dispersing agent which maintains (2) dispersed in (1) and which is a siloxane copolymer selected from the group consisting of i. polydimethylsiloxane-organic copolymers in which the polydimethylsiloxane portion has a molecular weight of at least 2000 and the organic portion consists essentially of a polyoxypropylene polymer having a molecular weight of at least 800 or a polyoxyethylene-polyoxypropylene copolymer having a molecular weight of at least 1500, said organic portion being attached to silicon atoms via silicon-carbon bonds, and ii. polydimethylsiloxane-organic copolymers which are the reaction products produced by heating a mixture of a polydimethylsiloxane containing silicon bonded hydrogen atoms having a molecular weight of at least 1500 and a hydroxylated polyoxypropylene having a molecular weight of at least 800 or a hydroxylated polyoxyethylene-polyoxypropylene copolymer having a

Claim 5

molecular weight of at least 1500. 2. A composition as defined in claim 1 wherein (1) is a polyoxypropylene polymer, in (2) the liquid polydimethylsiloxane has a viscosity in the range of 20 to 2000 centistokes, and (3) is a reaction product (ii).

Claim 6

A composition as defined in claim 1 wherein (1) is a mixture of a polyoxypropylene polymer and a siloxane glycol copolymer (d), in (2) the liquid polydimethylsiloxane has a viscosity in the range of 20 to 2000 centistokes, and (3) is a reaction product (ii).

Claim 7

A composition as defined in claim 3 wherein the siloxane glycol copolymer (d) has the general formula MeSi(OSiMe 2 ) 75 (OSiMeG) 7 OSiMe 3 wherein G is --(CH 2 ) 3 (OC 2 H 4 ) 24 (OC 3 H 6 ) 24 OOCCH 3 .

Claim 8

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

Claim 9

In a process of controlling foam which includes the addition of a foam control agent to the system in which the foaming is to be controlled, the improvement comprising using the composition of claim 3 as the foam control agent.

Claim 10

A composition as defined in claim 1 wherein (1) is a polyoxypropylene polymer, in (2) the liquid polydimethylsiloxane has a viscosity in the range of 20 to 2000 centistokes, and (3) is a reaction product (i).

Claim 11

A composition as defined in claim 1 wherein (1) is a mixture of a polyoxyropylene polymer and a siloxane glycol copolymer (d), in (2) the liquid polydimethylsiloxane has a viscosity in the range of 20 to 2000 centistokes, and (3) is a reaction product (i).

Claim 12

A composition as defined in claim 8 wherein the siloxane glycol copolymer (d) has the general formula MeSi(OSiMe 2 ) 75 (OSiMeG) 7 OSiMe 3 wherein G is --(CH 2 ) 3 (OC 2 H 4 ) 24 (OC 3 H 6 ) 24 OOCCH 3 .

Claim 13

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