USE OF VINYL PHOSPHONIC ACID FOR PRODUCING BIODEGRADABLE MIXED POLYMERS AND THE USE THEREOF FOR EXPLORING AND EXTRACTING PETROLEUM AND NATURAL GAS

摘要

A process for improving the biodegradability of copolymers which contain from 75 to 99.5% by weight, based oh the weight of the copolymer, of structural units of one or more monomers selected from the group consisting of compounds of the formula (1) formula (3) in which R1 and R2, independently of one another, are hydrogen or C1-C4-alkyl, formula (4) In which n is 3, 4 or 5, and formula (5) in which X is OH or NR3R4, and R3 and R4, independently of one another, are H or C1-C4-alkyl, by copolymerizing vinylphosphonic acid or a salt thereof in the copolymer in an amount of 0.5 to 25% by weight, based on the weight of the copolymer.