Method for curing polymers containing one or more carboxy or anhydride functions by means of polymers having hydroxyamide groups, and compositions

Claim 1

A method of curing addition polymers having carboxy groups, carboxylic anhydrides or salts of said carboxy groups which comprises the steps of (1 ) mixing said polymer with a different addition polymer containing two or more pendant β-hydroxyalkyl amide groups of the formula: ##STR10## wherein R 1 is hydrogen, alkyl having 1 to 5 carbon atoms, or hydroxyalkyl having from 1 to 5 carbon atoms; R 2 and R 3 are the same or different radicals selected from hydrogen, straight or branched chain alkyl having from 1 to 5 carbon atoms, or one of the R 2 and one of the R 3 radicals joined together with the carbon atoms to which they are attached form cycloalkyl and (2) heating the mixture at a temperature of from about 125° to 400° C. until a cured polymer is obtained.

Claim 2

A method of curing addition polymers having carboxy groups, carboxylic anhydrides or salts of said carboxy groups which comprises the steps of (1 ) mixing said polymer with a different addition polymer containing two or more pendant β-hydroxyalkyl amide groups of the formula: ##STR10## wherein R 1 is hydrogen, alkyl having 1 to 5 carbon atoms, or hydroxyalkyl having from 1 to 5 carbon atoms; R 2 and R 3 are the same or different radicals selected from hydrogen, straight or branched chain alkyl having from 1 to 5 carbon atoms, or one of the R 2 and one of the R 3 radicals joined together with the carbon atoms to which they are attached form cycloalkyl and (2) heating the mixture at a temperature of from about 125° to 400° C. until a cured polymer is obtained.

Claim 11

A method of curing addition polymers having carboxy groups, carboxylic anhydride groups, or salts thereof, with a different addition polymer containing two or more pendant β-hydroxyalkyl amide groups of the formula: ##STR13## wherein R 3 is H or --CH 3 , the carboxy, carboxylic anhydride groups, or salts thereof are in a copolymer prepared with a minor proportion of at least one ethylenically unsaturated acid monomer selected from acrylic acid, methacrylic acid, crotonic acid, maleic acid, 2-methyl maleic acid, itaconic acid, 2-methyl itaconic acid, β-methylene glutaric acid, maleic anhydride, itaconic anhydride, acrylic anhydride, and methacrylic anhydride, in which the ratio of a salt, carboxy, or anhydride functional groups to hydroxy functional groups is between about 0.5 and about 2 parts of hydroxy function per 1 part of carboxy function, wherein one anhydride group is equal to two carboxy functions, and the curing temperature is in the range of 125° to 175° C., and wherein a liquid selected from aromatic or aliphatic compounds, water, dimethyl formamide, dimethyl sulfoxide, ethers, esters, and alcohols is employed as the medium for carrying the mixture.

Claim 12

A method of curing addition polymers having carboxy groups, carboxylic anhydride groups, or salts thereof, with a different addition polymer containing two or more pendant β-hydroxyalkyl amide groups of the formula: ##STR13## wherein R 3 is H or --CH 3 , the carboxy, carboxylic anhydride groups, or salts thereof are in a copolymer prepared with a minor proportion of at least one ethylenically unsaturated acid monomer selected from acrylic acid, methacrylic acid, crotonic acid, maleic acid, 2-methyl maleic acid, itaconic acid, 2-methyl itaconic acid, β-methylene glutaric acid, maleic anhydride, itaconic anhydride, acrylic anhydride, and methacrylic anhydride, in which the ratio of a salt, carboxy, or anhydride functional groups to hydroxy functional groups is between about 0.5 and about 2 parts of hydroxy function per 1 part of carboxy function, wherein one anhydride group is equal to two carboxy functions, and the curing temperature is in the range of 125° to 175° C., and wherein a liquid selected from aromatic or aliphatic compounds, water, dimethyl formamide, dimethyl sulfoxide, ethers, esters, and alcohols is employed as the medium for carrying the mixture.