Aqueous emulsions containing hydrophilic silicone-organic copolymers
First Claim
1. An aqueous emulsion containing a hydrophilic, water-absorbing, silicone-organic copolymer elastomer consisting essentially of the product obtained upon reacting(A) from 50 to 95 parts by weight of at least one block copolymer of the formula ##STR7## wherein a is an integer of from 4 to 49, inclusive,b is an integer of from 0 to 15, inclusive,c is an integer having a value of from 2 to 4, inclusive,d is an integer of from 0 to 25, inclusive,e is an integer of from 5 to 50 inclusived+e is no greater than 50 and e is greater than or equal to d,f is 0 or 1,f'"'"' is 0 or 1,f+f'"'"'+b is at least 2,R is a monovalent hydrocarbon or halohydrocarbon radical of from 1 to 6 inclusive carbon atoms which is free of aliphatic unsaturation,R'"'"' is a methyl or a phenyl radical,Z is a monovalent radical selected from the group consisting of CH2 ═
- CR"COOR"'"'"'NHCOO--, CH2 ═
CHCH2 NHCOO-- and CH2 ═
CR"COO--,R" is an alkyl radical of from 1 to 4 inclusive carbon atoms or hydrogen, andR"'"'"' is a divalent hydrocarbon radical of from 1 to 6 inclusive carbon atoms with(B) from 5 to 50 parts by weight of at least one substantially water insoluble aliphatically unsaturated organic monomer which is compatible with said (A), said reaction being conducted under free radical polymerization conditions in the presence of water and an effective amount of a surfactant and wherein the dry elastomer obtained upon removal of the water is hydrophilic and capable of absorbing at least 3% by weight of water based upon the total weight of said elastomer.
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Abstract
This present invention provides aqueous emulsions which are capable of depositing coatings and membranes of hydrophilic, water-absorbing silicone-organic polymer elastomers. The elastomers are free radical polymerized copolymers of (A) from 50 to 95 parts by weight of block copolymers containing polydiorganosiloxane segments and polyalkyleneoxy segments which block copolymers contain terminal aliphatically unsaturated groups such as those derived from the reaction of isocyanatoethyl methacrylate with terminal free hydroxyl groups present on the polyalkyleneoxy segments and (B) from 5 to 50 parts by weight of at least one substantially water insoluble aliphatically unsaturated organic monomer which is compatible with (A) such as methyl methacrylate. The aqueous emulsions are useful for forming coatings and membranes of the above elastomers and also provide a vehicle for the deposition of coatings of such elastomers which are capable of controllably releasing bioactive agents such as insecticides or herbicides which are dispersed within the elastomer film deposited from the aqueous emulsion.
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12 Claims
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1. An aqueous emulsion containing a hydrophilic, water-absorbing, silicone-organic copolymer elastomer consisting essentially of the product obtained upon reacting
(A) from 50 to 95 parts by weight of at least one block copolymer of the formula ##STR7## wherein a is an integer of from 4 to 49, inclusive, b is an integer of from 0 to 15, inclusive, c is an integer having a value of from 2 to 4, inclusive, d is an integer of from 0 to 25, inclusive, e is an integer of from 5 to 50 inclusive d+e is no greater than 50 and e is greater than or equal to d, f is 0 or 1, f'"'"' is 0 or 1, f+f'"'"'+b is at least 2, R is a monovalent hydrocarbon or halohydrocarbon radical of from 1 to 6 inclusive carbon atoms which is free of aliphatic unsaturation, R'"'"' is a methyl or a phenyl radical, Z is a monovalent radical selected from the group consisting of CH2 ═ - CR"COOR"'"'"'NHCOO--, CH2 ═
CHCH2 NHCOO-- and CH2 ═
CR"COO--,R" is an alkyl radical of from 1 to 4 inclusive carbon atoms or hydrogen, and R"'"'"' is a divalent hydrocarbon radical of from 1 to 6 inclusive carbon atoms with (B) from 5 to 50 parts by weight of at least one substantially water insoluble aliphatically unsaturated organic monomer which is compatible with said (A), said reaction being conducted under free radical polymerization conditions in the presence of water and an effective amount of a surfactant and wherein the dry elastomer obtained upon removal of the water is hydrophilic and capable of absorbing at least 3% by weight of water based upon the total weight of said elastomer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- CR"COOR"'"'"'NHCOO--, CH2 ═
Specification