Treatment of paper and textile fabrics with emulsified epoxy-silicones
AssigneeUnion Carbide Corporation
InventorsGordon Carlton Johnson, Richard Bruce Metzler
Life of this patent
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Abstract
Paper and textile fabric substrates have been rendered water repellent by treatment of water-dispersible aqueous emulsions of epoxy-silicones where the emulsifying agent is an anionic sulfonate emulsifier, which is capable of forming stable aqueous emulsions of epoxy-silicones, which cure rapidly without curing catalysts.
Claims19
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.
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.
Dependencies are inferred from the claim text.