Aqueous coating composition

Claim 2

AN AQUEOUS COATING COMPOSITION COMPRISING A WATERSOLUBLE OR WATER-DISPERSIBLE COPOLYMER PREPARED BY ADDITON REACTING WITH AT LEAST ONE A,B-UNSATURATED DICARBOXYLIC COMPOUND A LIQUID COPOLYMER COMPRIDING 90-50% BY WEIGHT OF 1,3-PENTADIENE UNITS AND 10-50% BY WEIGHT OF 1,3-BUTADIENE UNITS AND HAVING AN AVERAGE MOLECULAR WEIGHT OF 500-5,000, THE LIQUID COPOLYMER HAVING BEEN PREPARED BY THE COPOLYMERIZATION OF 1,3-PENTADIENE AND 1,3-BUTADIENE IN THE PRESENCE OF A FRIEDEL-CRAFTS TYPE CATALYST, AND NEUTRALIZATION OF THE THUSOBTAINED MODIFIED COPOLYMER TO MAKE IT SOLUBLE OR DISPERSIBLE IN WATER.

Claim 3

An aqueous coating composition as claimed in claim 1, wherein the Alpha , Beta -unsaturated dicarboxylic compound is represented by the general formula

Claim 4

An aqueous coating composition as claimed in claim 1, wherein the Alpha , Beta -unsaturated dicarboxylic compound is a member selected from the group consisting of maleic acid, maleic anhydride, chloromaleic anhydride, citraconic anhydride, 1,2-diethylmaleic anhydride, monomethyl maleate and monoethyl maleate.

Claim 5

An aqueous coating composition as claimed in claim 1, wherein the liquid copolymer further comprises units derived from at least one other olefin in amounts of not more than 20% by weight of the total of the 1,3-pentadiene and 1,3-butadiene units.

Claim 6

An aqueous coating composition as claimed in claim 4, wherein the other olefin is a member selected from the group consisting of butene-1, isobutylene, isoprene, 2-methylbutene-2 and cyclopentene.

Claim 7

A process for the preparation of an aqueous coating composition comprising the steps of copolymerizing, in the presence of a Friedel-Crafts type catalyst, a monomer reactant selected from the group consisting of 1,3-pentadiene and 1,3-butadiene; and 1,3-pentadiene, 1,3-butadiene and at least one other olefin copolymerizable with said dienes, under such conditions that the resulting copolymer comprises 90-50 parts by weight of 1,3-pentadiene polymerization units, 10-50 parts by weight of 1,3-butadiene and not more than about 20 parts by weight of the other olefin polymerization units and has an average molecular weight of 500-5,000; addition reacting the thus-obtained copolymer with at least one Alpha , Beta -unsaturated dicarboxylic compound; and then neutralizing the thus-modified copolymer to make it soluble or dispersible in water.

Claim 8

A process for the preparation of an aqueous coating composition comprising the steps of copolymerizing, in the presence of a Friedel-Crafts type catalyst, a monomer reactant selected from the group consisting of 1,3-pentadiene and 1,3-butadiene; and 1,3-pentadiene, 1,3-butadiene and at least one other olefin copolymerizable with said dienes, under such conditions that the resulting copolymer comprises 90-50 parts by weight of 1,3-pentadiene polymerization units, 10-50 parts by weight of 1,3-butadiene and not more than about 20 parts by weight of the other olefin polymerization units and has an average molecular weight of 500-5,000; addition reacting the thus-obtained copolymer with at least one Alpha , Beta -unsaturated dicarboxylic compound; and then neutralizing the thus-modified copolymer to make it soluble or dispersible in water.

Claim 9

A process as claimed in claim 6, wherein the other olefin is a member selected from the group consisting of maleic acid, maleic anhydride, chloromaleic anhydride, citraconic anhydride, 1,2-diethylmaleic anhydride, monomethyl maleate and monoethyl maleate.

Claim 10

A process as claimed in claim 6, wherein the Alpha , Beta -unsaturated dicarboxylic compound is represented by the general formula

Claim 11

A process as claimed in claim 6, wherein the Alpha , Beta -unsaturated dicarboxylic compound is a member selected from the group consisting of maleic acid, maleic anhydride, chloromaleic anhydride, citraconic anhydride, 1,2-diethylmaleic anhydride, monomethyl maleate and monoethyl maleate.

Claim 12

A process as claimed in claim 6, wherein the copolymer to be addition reacted and the Alpha , Beta -unsaturated dicarboxylic compound are used in ratios by weight of from 100 : 3 to 100 : 100.

Claim 13

A process as claimed in claim 6, wherein the addition reaction is effected at 50* - 300*C for 1/12 - 10 hours.

Claim 14

A process as claimed in claim 8, wherein the copolymer to be addition reacted and the Alpha , Beta -unsaturated dicarBoxylic compound are used in ratios by weight of from 100 : 3 to 100 : 100.

Claim 15

A process as claimed in claim 10, wherein the addition reaction is effected at 50* - 300*C for 1/12 - 10 hours.