Claims
- 1. In the method of imparting water repellency to paper and textile fabric substrates which comprises contacting the substrates with a water-dispersible aqueous emulsion of an epoxy-silicone having the formula:
- MD.sub.x U.sub.y M'.sub.q
- wherein D represents an R.sub.2 SiO unit in which R is a monovalent hydrocarbon radical free of acetylenic unsaturation; U represents a unit selected from the class consisting of ##STR10## in which R is as defined above and R' a monovalent organic radical containing at least one vicinal epoxy group, ##STR11## M and M' are in each occurrence an endblocking unit having the formula ##STR12## in which R" is a monovalent hydrocarbon radical free of olefinic unsaturation, R' is as defined above, a has a value from 0 to 1 inclusive, q has a value of 1 when U is an ##STR13## unit and a value of (y + 1) when U is an R'SiO.sub.3/2 unit, x is an integer having a value of from 10 to about 10.sup.5, y is an integer having a value of from 1 to about 10.sup.2, the sum of x, y and q being such that the epoxy-silicone compound MD.sub.x U.sub.y M' has a molecular weight of from about 10.sup.3 to about 10.sup.6 and the ratio of epoxy-containing units to units containing no epoxy groups is within the range of from about 0.001 to 0.5, said epoxy-silicone being employed in an amount of from about 0.01 to about 4 weight % based on the weight of dry substrate, the improvement which consists of producing an aqueous emulsion for application to said substrates by emulsifying said epoxy-silicone in water using about 1 to 25 weight %, based on the weight of said epoxy-silicone, of an anionic sulfonate emulsifier capable of producing an aqueous emulsion of said epoxy-silicone having a maximum water absorption on paper at 49.degree. C. for 3 minutes of about 0.6 g./100 cm.sup.2 when measured by the Cobb Test in accordance with TAPPI-T-441.
- 2. Method claimed in claim 1 wherein the anionic sulfonate emulsifier is selected from the group consisting of salts of an alkylaryl sulfonic acid, alkali metal salts of a dialkyl sulfosuccinic acid, alkali metal salts of an alkylaryl polyether sulfonic acid, alkali metal salts of an alkyl naphthalene sulfonic acid, and alkali metal salts of an alkane sulfonic acid.
- 3. Method claimed in claim 2 wherein the emulsifier is a salt of an alkylaryl sulfonic acid.
- 4. Method claimed in claim 3 wherein the salt is an alkali metal salt.
- 5. Method claimed in claim 3 wherein the salt is a morpholine salt.
- 6. Method claimed in claim 3 wherein the salt is an alkanolamine salt.
- 7. Method claimed in claim 2 wherein the emulsifier is an alkali metal dialkyl sulfosuccinate.
- 8. Method claimed in claim 2 wherein the emulsifier is an alkylaryl polyether alkali metal sulfonate salt.
- 9. Method claimed in claim 2 wherein the emulsifier is an alkyl naphthalene sulfonate alkali metal salt.
- 10. Method claimed in claim 1 wherein the emulsifier is an alkane sulfonate.
- 11. Composition suitable for imparting water repellency to paper and textile fabric substrate consisting of a water-dispersible aqueous emulsion of an epoxy-silicone having the formula:
- MD.sub.x U.sub.y M'.sub.q
- wherein D represents a R.sub.2 SiO unit in which R is a monovalent hydrocarbon radical free of acetylenic unsaturation; U represents a unit selected from the class consisting of ##STR14## in which R is as defined above and R' is a monovalent organic radical containing at least one vicinal epoxy group, ##STR15## M and M' are in each occurrence an end blocking unit having the formula: ##STR16## in which R" is a monovalent hydrocarbon radical free of olefinic unsaturation, R' is as defined above, a has a value from 0 to 1 inclusive, has a value of 1 when U is an ##STR17## unit and a value of (y + 1) when U is an R'SiO.sub.3/2 unit, x is an integer having a value of from 10 to about 10.sup.5, y is an integer having a value of from 1 to about 10.sup.2, the sum of x, y, and q being such that the epoxy-silicone compound MD.sub.x U.sub.y M'.sub.q has a molecular weight of from about 10.sup.3 to about 10.sup.6 and the ratio of epoxy-containing units to units containing no epoxy groups is within the range of from about 0.001 to 0.5, said epoxy-silicone being employed in an amount of from about 0.01 to about 4 weight % based on the weight of dry substrate, emulsified in water with about 1 to about 25 weight % of an anionic sulfonate emulsifier, based on the weight of the epoxy-silicone, capable of producing an aqueous emulsion of said epoxy-silicone having a maximum water absorption on paper at 49.degree. C. for 3 minutes of about 0.6 g./100 cm.sup.2 when measured by the Cobb Test in accordance with TAPPI-T-441.
- 12. Composition claimed in claim 11 wherein the anionic sulfonate emulsifier is selected from the group consisting of salts of an alkylaryl sulfonic acid, alkali metal salts of a dialkyl sulfosuccinic acid, alkali metal salts of an alkylaryl polyether sulfonic acid, alkali metal salts of an alkyl naphthalene sulfonic acid, and alkali metal salts of an alkane sulfonic acid.
- 13. Composition claimed in claim 12 wherein the emulsifier is a salt of an alkylaryl sulfonic acid.
- 14. Composition claimed in claim 13 wherein the salt is an alkali metal salt.
- 15. Composition claimed in claim 13 wherein the salt is an alkanolamine salt.
- 16. Composition claimed in claim 12 wherein the emulsifier is an alkali metal salt of a dialkyl sulfosuccinic acid.
- 17. Composition claimed in claim 12 wherein the emulsifier is an alkali metal salt alkylaryl polyether sulfonic acid.
- 18. Composition claimed in claim 12 wherein the emulsifier is an alkali metal salt of an alkyl naphthalene sulfonic acid.
- 19. Composition claimed in claim 12 wherein the emulsifier is an alkali metal salt of an alkane sulfonic acid.
Parent Case Info
This is a continuation-in-part of Ser. No. 521,512 filed Nov. 6, 1974, now abandoned.
US Referenced Citations (8)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
521512 |
Nov 1974 |
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