abstract |
A process is disclosed for stabilising copolymers of maleic acid or maleic anhydride and vinyl alkyl ethers so that they do not lose their molecular weight in an aqueous solution or in a solution of organic solvent. For that purpose, 0.001 to 10 % by weight, in relation to the copolymers, of a reducing agent, a tertiary butyl group-containing phenol or their mixtures are added to the copolymers. |