EP0217501A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Improved silicone foam-control agent
Assignee: Dow Silicones UK Ltd
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Filing: 1986-07-23
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Granted: —
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Expires: 2006-07-23
Abstract
Abstract A foam control composition, which gives improved performance in high foaming detergent compositions, comprises (A) a liquid siloxane component which has a viscosity at 25 DEG C of at least 7 x 10<-><3> m<2>/s and which has been obtained by mixing and heating a triorganosiloxane-endblocked polydiorganosiloxane, a polydiorganosiloxane having at least one terminal silanol group and an organosiloxane resin, comprising monovalent and tetravalent siloxy units and having at least one silanol group per molecule, and (B) a finely divided filler having its surface made hydrophobic. Also described is a method for making such foam control compositions and detergent compositions containing such foam control compositions.
Inventors
- 👤 Vivian Brian John
- 👤 George Christopher Sawicki
- 👤 Reginald Pope
- 👤 Robert James Scampton
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 05:31
CPC Classifications
B; B01; B01D; B01D19/00; B01D19/02; B01D19/04; B01D19/0404; B01D19/0409
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
150 words
A foam control composition comprising (A) a liquid siloxane component and (B) a finely divided filler having its surface rendered hydrophobic, characterised in that the liquid siloxane component (A) has a viscosity at 25°C of at least 7 x 10- 3 m 2 /s and is obtained by mixing (1) 100 parts by weight of a polydiorganosiloxane having triorganosiloxy end groups, (2) from 10 to 125 parts by weight of a polydiorganosiloxane having at least one terminal silanol group and at least 40 Si atoms, and (3) from 0.5 to 10 parts by weight of an organopolysiloxane resin comprising R" 3 SiO 0.5 units and Si0 2 units in a ratio of from 0.5:1 to 1.2:1 and in which R" denotes a. monovalent hydrocarbon group containing from 1 to 6 carbon atoms, said resin having on average at least one silicon-bonded hydroxyl group per molecule, and thereafter heating the mixture.
Claim 2
Dependent Claim
150 words
A foam control composition comprising (A) a liquid siloxane component and (B) a finely divided filler having its surface rendered hydrophobic, characterised in that the liquid siloxane component (A) has a viscosity at 25°C of at least 7 x 10- 3 m 2 /s and is obtained by mixing (1) 100 parts by weight of a polydiorganosiloxane having triorganosiloxy end groups, (2) from 10 to 125 parts by weight of a polydiorganosiloxane having at least one terminal silanol group and at least 40 Si atoms, and (3) from 0.5 to 10 parts by weight of an organopolysiloxane resin comprising R" 3 SiO 0.5 units and Si0 2 units in a ratio of from 0.5:1 to 1.2:1 and in which R" denotes a. monovalent hydrocarbon group containing from 1 to 6 carbon atoms, said resin having on average at least one silicon-bonded hydroxyl group per molecule, and thereafter heating the mixture.
Claim 3
Dependent Claim
19 words
A foam control composition according to Claim 1 further characterised in that polydiorganosiloxane (1) is a trimethylsiloxy endblocked polydimethylsiloxane.
Claim 4
Dependent Claim
43 words
A foam control composition according to either one of Claims 1 or 2 further characterised in that polydiorganosiloxane (1) has a viscosity at 25°C in the range of 3 x 10 -4 m 2 /s to 6 x 10- 2 m 2 /s.
Claim 5
Dependent Claim
53 words
A foam control composition according to any one of the preceding claims further characterised in that polydiorganosiloxane (2) has one hydroxyl group on each terminal silicon atom, substantially all other substituents are alkyl radicals containing from 1 to 8 carbon atoms and has from 400 to 1000 silicon atoms in the siloxane chain.
Claim 6
Dependent Claim
29 words
A foam control composition according to any one of the preceding claims further characterised in that polydiorganosiloxane (2) has from 500 to 900 silicon atoms in the siloxane chain.
Claim 7
Dependent Claim
42 words
A foam control composition according to any one of the preceding claims further characterised in that liquid siloxane component (A) has a viscosity at 25°C of from 1 x 10- 2 m 2 /s to 3 x 10- 2 m 2 /s.
Claim 8
Dependent Claim
36 words
A foam composition according to any one of the preceding claims further characterised in that from 3 to 15 percent by weight of filler is used based on the total weight of the foam control composition.
Claim 9
Independent Claim
181 words
A method of making a foam control composition characterised in that the method comprises (I) forming a mixture comprising (a) 100 parts by weight of a polydiorganosiloxane having triorganosiloxy end groups, (b) from 10 to 125 parts by weight of a polydiorganosiloxane having at least one terminal silanol group and at least 40 Si atoms, and (c) sufficient within the range from 0.5 to 10 parts by weight of an organopolysiloxane resin comprising R" 3 SiO 0.5 units and Si02 units in a ratio of from 0.5:1 to 1.2:1 and in which R" denotes a monovalent hydrocarbon group containing from 1 to 6 carbon atoms, said resin having on average at least one silicon-bonded hydroxyl group per molecule in order to obtain a liquid siloxane component which, after the heating step (II), has a viscosity at 25°C of at least 7 x 10- 3 m 2 /s and subsequently (II) heating the mixture obtained by step] - (I) and (III) adding thereto a finely divided filler having a surface which has been rendered hydrophobic by contact with a filler treating agent.
Claim 10
Independent Claim
181 words
A method of making a foam control composition characterised in that the method comprises (I) forming a mixture comprising (a) 100 parts by weight of a polydiorganosiloxane having triorganosiloxy end groups, (b) from 10 to 125 parts by weight of a polydiorganosiloxane having at least one terminal silanol group and at least 40 Si atoms, and (c) sufficient within the range from 0.5 to 10 parts by weight of an organopolysiloxane resin comprising R" 3 SiO 0.5 units and Si02 units in a ratio of from 0.5:1 to 1.2:1 and in which R" denotes a monovalent hydrocarbon group containing from 1 to 6 carbon atoms, said resin having on average at least one silicon-bonded hydroxyl group per molecule in order to obtain a liquid siloxane component which, after the heating step (II), has a viscosity at 25°C of at least 7 x 10- 3 m 2 /s and subsequently (II) heating the mixture obtained by step] - (I) and (III) adding thereto a finely divided filler having a surface which has been rendered hydrophobic by contact with a filler treating agent.
Claim 11
Dependent Claim
23 words
A method for making foam control composition according to Claim 8 further characterised in that there is added a catalyst during step (II).
Claim 12
Dependent Claim
44 words
A detergent composition comprising (1) 100 parts by weight of a detergent component and (2) from 0.05 to 5 parts by weight of a foam control composition characterised in that the foam control composition is according to any one of Claims 1 to 7..
Claim 13
Dependent Claim
51 words
A detergent composition comprising (1) 100 parts by weight of a detergent component and (2) from 0.05 to 5 parts by weight of a foam control composition according to any one of Claims 1 to 7 further characterised in that at least a part of the foam control composition is encapsulated.
Claim 14
Dependent Claim
3 words
CLAIMS FOR AUSTRIA
Claim 15
Independent Claim
185 words
A method of making a foam control composition characterised in that the method comprises (I) forming a mixture comprising (a) 100 parts by weight of a polydiorganosiloxane having triorganosiloxane end groups, (b) from 10 to 125 parts by weight of a polydiorganosiloxane having at least one terminal silanol group and at least 40 Si atoms, and (c) sufficient in range from 0.5 to 10 parts by weight of an organopolysiloxane resin comprising R" 3 SiO 0.5 units and Si02 units in a ratio of from 0.5:1 to 1.2:1 and in which R" denotes a monovalent hydrocarbon group containing from 1 to 6 carbon atoms, said resin having on average at least one silicon-bonded hydroxyl group per molecule in order to obtain a liquid siloxane component which, after the heating step (II), has a viscosity at 25°C of at least 7 x 10- 3 m 2 /s and subsequently (II) heating the mixture obtained by step (I) and (III) adding thereto a finely divided filler having a surface which has been rendered hydrophobic or which is subsequently rendered hydrophobic by contact with a filler treating agent.
Claim 16
Independent Claim
185 words
A method of making a foam control composition characterised in that the method comprises (I) forming a mixture comprising (a) 100 parts by weight of a polydiorganosiloxane having triorganosiloxane end groups, (b) from 10 to 125 parts by weight of a polydiorganosiloxane having at least one terminal silanol group and at least 40 Si atoms, and (c) sufficient in range from 0.5 to 10 parts by weight of an organopolysiloxane resin comprising R" 3 SiO 0.5 units and Si02 units in a ratio of from 0.5:1 to 1.2:1 and in which R" denotes a monovalent hydrocarbon group containing from 1 to 6 carbon atoms, said resin having on average at least one silicon-bonded hydroxyl group per molecule in order to obtain a liquid siloxane component which, after the heating step (II), has a viscosity at 25°C of at least 7 x 10- 3 m 2 /s and subsequently (II) heating the mixture obtained by step (I) and (III) adding thereto a finely divided filler having a surface which has been rendered hydrophobic or which is subsequently rendered hydrophobic by contact with a filler treating agent.
Claim 17
Dependent Claim
23 words
A method for making a foam control composition according to Claim 1 further characterised in that polydiorganosiloxane (a) is a trimethylsiloxy endblocked polydimethylsiloxane.
Claim 18
Independent Claim
47 words
A method for making a foam control composition according to either one of Claims 1 or 2 further characterised in that polydiorganosiloxane (a) has a viscosity at 25°C in the range of 3 x 10 -4 m 2 /s to 6 x 10 -2 m 2 /s.
Claim 19
Independent Claim
57 words
A method for making a foam control composition according to any one of the preceding claims further characterised in that polydiorganosiloxane (b) has one hydroxyl group on each terminal silicon atom, substantially all other substituents are alkyl radicals containing from 1 to 8 carbon atoms and has from 400 to 1000 silicon atoms in the siloxane chain.
Claim 20
Independent Claim
34 words
A method for making a foam control composition according to any one of the preceding claims further characterised in that in polydiorganosiloxane (b) has from 500 to 900 silicon atoms in the siloxane chain.
Claim 21
Independent Claim
49 words
A method of making a foam control composition according to any one of the preceding claims further characterised in that liquid siloxane component obtained by steps (I) and (II) has a viscosity at 25°C of from 1 x 10 -2 m'/s to 3 x 10- 2 m 2 /s.
Claim 22
Independent Claim
41 words
A method of making a foam control composition according to. any one of the preceding claims further characterised in that from 3 to 15 percent by weight of filler is used based on the total weight of the foam control composition.
Claim 23
Independent Claim
28 words
A method for making a foam control composition according to any one of the preceding claims further characterised in that there is added a catalyst during step (II).
References Cited (Backward Citations)
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