Claims
- 1. A dispersible silicone composition comprising a blend of:
(I) a silicone composition prepared by reacting at a temperature of 50° C. to 300° C. a mixture comprising:
(i) 100 parts by weight of at least one polyorganosiloxane selected from
(A) a polyorganosiloxane having a viscosity of about 20 to 100,000 mm2/s at 25° C. and being expressed by the general formula R1aSiO(4−a)/2 in which R1 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, (B) a polyorganosiloxane having a viscosity of 200 to about 100 million mm2/s at 25° C. expressed by the general formula R2b(R3O)cSiO(4−b−c)/2 in which R2 is a monovalent hydrocarbon or halogenated hydrocarbon group having 1 to 10 carbon atoms, R3 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 —OR3 group in each molecule, at least one such —OR3 group being present at the end of the molecular chain, or (C) a mixture of (A) and (B); (ii) 0.5 to 20 parts by weight of at least one silicon compound selected from
(a) an organosilicon compound of the general formula R4dSiX4−d in which R4 is a monovalent hydrocarbon group having 1 to 5 carbon atoms, X is selected from a halogen atom or 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 comprising (CH3)3SiO½ units and SiO{fraction (4/2)} units wherein the ratio of (CH3)3SiO½ units to SiO{fraction (4/2)} units is 0.4:1 to 1.2:1, or (d) a condensate of said compound (c) with said compound (a) or (b); and (iii) a catalytic amount of a compound for promoting the reaction of components (i) and (ii); and (II) a polyisobutylene compound.
- 2. A composition according to claim 1, wherein polyorganosiloxane (A) is a trimethylsiloxy-terminated polydimethylsiloxane having a viscosity of about 350 to 15,000 mm 2/s at 25° C.
- 3. A composition according to claim 1, wherein polyorganosiloxane (B) is a hydroxyl-terminated polydimethylsiloxane having a viscosity of about 1,000 to 50,000 mm2/s at 25° C.
- 4. A composition according to claim 1, wherein silicon compound (ii) is selected from ethyl polysilicate or a siloxane resin copolymer comprising (CH3)3SiO½ units and SiO2 units in a molar ratio of approximately 0.4:1 to 1.2:1, respectively.
- 5. A composition according to claim 1, wherein the catalyst (iii) is selected from alkali metal hydroxides, alkali metal silanolates, alkali metal alkoxides, quaternary ammonium hydroxides, quaternary ammonium silanolates, quaternary phosphonium hydroxides, quaternary phosphonium silanolates, ammonium carbonate, or metal salts of organic acids.
- 6. A composition according to claim 1, wherein the mixture of (I) further comprises up to 30 parts by weight of: (iv) at least one finely divided filler.
- 7. A composition according to claim 6, wherein the finely divided filler (iv) is a hydrophobic silica having a surface area of about 50 to 300 m2/g.
- 8. A composition according to claim 1, wherein the mixture of (I) further comprises up to 20 parts by weight of: (v) a polyorganosiloxane having a viscosity of 5 to 200 mm2/s at 25° C. and being expressed by the general formula R6e(R9O)fSiO(4−e−f)/2 in which R6 is a monovalent hydrocarbon or halogenated hydrocarbon group having 1 to 10 carbon atoms, R9 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 —OR9 groups in each molecule at the end of a molecular chain.
- 9. A composition according to claim 6, wherein the mixture of (I) further comprises up to 20 parts by weight of: (v) a polyorganosiloxane having a viscosity of 5 to 200 mm2/s at 25° C. and being expressed by the general formula R6e(R9O)fSiO(4−e−f)/2 in which R6 is a monovalent hydrocarbon or halogenated hydrocarbon group having 1 to 10 carbon atoms, R9 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 —OR9 groups in each molecule at the end of a molecular chain.
- 10. A composition according to claim 8, wherein said polyorganosiloxane (v) is a hydroxyl-terminated polydimethylsiloxane having a viscosity of about 10 to 100 mm 2/s at 25° C.
- 11. A composition according to claim 9, wherein said polyorganosiloxane (v) is a hydroxyl-terminated polydimethylsiloxane having a viscosity of about 10 to 100 mm2/s at 25° C.
- 12. A composition according to claim 1, wherein one end group of said polyisobutylene is a saturated group and another end group is selected from a saturated group or an unsaturated group and said polyisobutylene has a number average molecular weight of 20 about 200 to about 400.
- 13. A composition according to claim 12, wherein the saturated endgroup is independently selected from —C(CH3)3 or —CH2C(CH3)2H and the unsaturated endgroup is independently selected from —CH═C(CH3)2 or —CH═CH2.
- 14. A composition according to claim 1, wherein the composition further comprises at least one component selected from (III) a finely divided filler or (IV) at least one polyorganosiloxane selected from a trimethylsilyl-terminated polydimethylsiloxane having a viscosity of about 2 to 100 mm2/s at 25° C., a trimethylsilyl-terminated polydimethylsiloxane having a viscosity of about 100 to 100,000 mm2/s at 25° C., or a hydroxyl-terminated polydiorganosiloxane polymer having a viscosity of about 5 to 100,000 mm2/s at 25° C.
- 15. A composition according to claim 6, wherein the composition further comprises at least one component selected from (III) a finely divided filler or (IV) at least one polyorganosiloxane selected from a trimethylsilyl-terminated polydimethylsiloxane having a viscosity of about 2 to 100 mm2/s at 25° C, a trimethylsiloxy-terminated polydimethylsiloxane having a viscosity of about 100 to 100,000 mm2/s at 25° C., or a hydroxyl-terminated polydiorganosiloxane polymer having a viscosity of about 5 to 100,000 mm2/s at 25° C.
- 16. A composition according to claim 8, wherein the composition further comprises at least one component selected from (III) a finely divided filler or (IV) at least one polyorganosiloxane selected from a trimethylsilyl-terminated polydimethylsiloxane having a viscosity of about 2 to 100 mm2/s at 25° C., a trimethylsiloxy-terminated polydimethylsiloxane having a viscosity of about 100 to 100,000 mm2/s at 25° C., or a hydroxyl-terminated polydiorganosiloxane polymer having a viscosity of about 5 to 100,000 mm2/s at 25° C.
- 17. A composition according to claim 9, wherein the composition further comprises at least one component selected from (III) a finely divided filler or (IV) at least one polyorganosiloxane selected from a trimethylsilyl-terminated polydimethylsiloxane having a viscosity of about 2 to 100 mm2/s at 25° C., a trimethylsiloxy-terminated polydimethylsiloxane having a viscosity of about 100 to 100,000 mm2/s at 25° C., or a hydroxyl-terminated polydiorganosiloxane polymer having a viscosity of about 5 to 100,000 mm2/s at 25° C.
- 18. A composition according to claim 1, wherein the composition further comprises at least one component selected from (V) mineral oil or a mixture of (V) mineral oil and (VI) a saturated or unsaturated bisamide.
- 19. A composition according to claim 6, wherein the composition further comprises at least one component selected from (V) mineral oil or a mixture of (V) mineral oil and (VI) a saturated or unsaturated bisamide.
- 20. A composition according to claim 8, wherein the composition further comprises at least one component selected from (V) mineral oil or a mixture of (V) mineral oil and (VI) a saturated or unsaturated bisamide.
- 21. A composition according to claim 9, wherein the composition further comprises at least one component selected from (V) mineral oil or a mixture of (V) mineral oil and (VI) a saturated or unsaturated bisamide.
- 22. A method for controlling foam in a foam producing system comprising adding to the foam producing system the composition of claim 1.
- 23. A method for controlling foam in a foam producing system comprising adding to the foam producing system the composition of claim 6.
- 24. A method for controlling foam in a foam producing system comprising adding to the foam producing system the composition of claim 8.
- 25. A method for controlling foam in a foam producing system comprising adding to the foam producing system the composition of claim 9.
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This patent application is a continuation-in-part of U.S. patent application Ser. No. 08/635,119, filed Apr. 19, 1996, pending.
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
08635119 |
Apr 1996 |
US |
Child |
10256670 |
Sep 2002 |
US |