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Abstract

The invention relates to a method for reacting polymers (A) comprising hydroxyl groups and which have repetitive structural units of general formula (I), wherein D represents a direct bond between the polymer backbone and a hydroxyl group, a C₁- to C₆-alkene group, a C₅- to C₁₂-arylene group, an oxyalkylene group of formula —O—R²—, an ester group of formula —C(O)—O—R²— or an amide group of formula —C(O)—N(R⁸)R²—, R² represents a C₂- to C₁₀-alkene group, R⁸ represents hydrogen or an optionally substituted C₂- to C₁₀-alkyl group and n represents a number between 3 and 5000, with carboxylic acids B1) of formula (II) or carboxylic acid esters B2) of formula (III) R¹—COOH (II) R¹—COOR⁷ (III), wherein R¹ represents a hydrocarbon group having 2 to 50 C atoms, and R⁷ represents a C₁C₄-alkyl group, in which the polymers (A); comprising the hydroxyl groups are exposed to microwaves in the presence of carboxylic acids of formula (II) or carboxylic acid esters of formula (III) and in the presence of water. The reaction mixture is heated to temperatures over 100° C. by microwave rays.

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First Claim