Patent ID: 6683129
Filing Date: 2004-01-27
Classification: C08F

Abstract:
An aqueous emulsion comprising a water-dispersible copolymer characterized in that films formed from said water-dispersible copolymer are dispersible in water, yet non-dispersible in aqueous solutions containing 0.5% by weight or more of an inorganic salt, and wherein the water-dispersible copolymer comprises in percentages by weight:(A) from about 25% to about 80% of acidic ethylenically unsaturated monomer units, with the proviso that the acidic ethylenically unsaturated monomer units are not acrylic acid; (B) from about 10% to about 80% of ethylenically unsaturated monomer units selected from the group of monomer formulas consisting of: (i) CH2&boxH;C(R1)COR2; (i) R3OOCâ€”CH&boxH;CHâ€”COOR4; (iii) CH2&boxH;C(R5)OCOR6; (iv) CH2&boxH;C(COOR7)CH2COOR8; (v) CH3CH&boxH;CHCOOR9; (vi) R10C6H4CR11&boxH;CHR11; and (vii) R12CH&boxH;CHR13; â€ƒwherein R1 is hydrogen or methyl and R2 is â€”OZâ€² or â€”N(Zâ€³)(Zâ€³), wherein Zâ€² is an alkyl group having from 1 to 7 carbon atoms, and Zâ€³ is independently selected from the group consisting of hydrogen and alkyl groups having from 1 to 6 carbon atoms; R3 and R4 are independently hydrogen or an alkyl group having from 1 to 7 carbon atoms, with the proviso that R3 and R4 are not both hydrogen; R5 is hydrogen or methyl and R6 is an alkyl group having from 1 to 7 carbon atoms; R7 and R8 are independently hydrogen or an alkyl group having from 1 to 7 carbon atoms, with the proviso that R7 and R8 are not both hydrogen; R9 is an alkyl group having from 1 to 7 carbon atoms; R10 and R11 are hydrogen; and R12 and R13 are independently selected from the group consisting of hydrogen, â€”CN, â€”NHCHO, and an all group having from 1 to 7 carbon atoms; and (C) from about 10% to about 80% of ethylenically unsaturated monomer units selected from the group of monomer formulas consisting of; (i) CH2&boxH;C(Râ€²1)CORâ€²2; (ii) Râ€²3OOCâ€”CH&boxH;CHâ€”COORâ€²4; (iii) CH2&boxH;C(Râ€²5)OCORâ€²6; (iv) CH2&boxH;C(COORâ€²7)CH2COORâ€²8; (v) CH3CH&boxH;CHCOORâ€²9; (vi) Râ€²10C6H4CRâ€²11&boxH;CHRâ€²11; and (vii) Râ€²12CH&boxH;CHRâ€²13; â€ƒwherein Râ€²1 is hydrogen or methyl, and Râ€²2 is selected from the group consisting of â€”OZâ€², â€”N(Zâ€³)(Zâ€³), and â€”OZâ€²â€³OH, wherein Zâ€² is an alkyl group having from 8 to 18 carbon atoms; Zâ€³ is independently selected from the group consisting of alkyl groups having from 7 to 10 carbon atoms, dimethylamino alkyl groups having from 1 to 5 carbon atoms, and hydroxyalkyl groups having from 1 to 5 carbon atoms; and Zâ€²â€³ is an alkyl group having from 1 to 4 carbon atoms; Râ€²3 and Râ€²4 are independently an alkyl group having from 8 to 18 carbon atoms; Râ€²5 is hydrogen or methyl and Râ€²6 is an alkyl group having from 8 to 18 carbon atoms; Râ€²7 and Râ€²8 are independently an alkyl group having from 8 to 18 carbon atoms; Râ€²9 is an alkyl group having from 8 to 18 carbon atoms; Râ€²10 and Râ€²11 are independently an alkyl group having from 1 to 2 carbon atoms; Râ€²12 and Râ€²13 are independently selected from the group consisting of 2-pyrrolidinone, N-caprolactam, and an alkyl group having from 7 to 18 carbon atoms, with the proviso that R12 and R13 are not both 2-pyrrolidinone, are not both N-caprolactam, or are not a mixture thereof; and the copolymer has a weight average molecular weight greater than about 25,000 and is present in an amount from about 20% to about 70% by weight, based on the aqueous emulsion.