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AssigneeClariant Finance (BVI) Limited
InventorsChristoph Kayser, Gernold Botthof, Juergen Tonhauser, Michael Schaefer, Claudia Diemel, Karl-Heinz Heier
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The invention relates to the use of vinyl phosphonic acid or a salt thereof for improving the biodegradability of mixed polymers, comprising 25 to 99.5% by weight of structural units of one or more monomers selected from the group made of compounds of formula (1) and formula (3), where R1 and R2 independently are hydrogen or C1-C4-alkyl, formula (4), where n is 3, 4, or 5, and formula (5), where X is OH or for NR3R4, and R3 and R4 independently are H or C1 to C4-alkyl, in that 0.5 to 25% by weight of vinyl phosphonic acid is polymerized into the mixed polymer.
A copolymer with improved biodegradability comprising a vinylphosphonic acid or of a salt thereof as a monomer in an amount of 0.5 to 25% by weight, based on the weight of the copolymer, obtained by free-radical copolymerization of the compounds of the formulae (1), (3), (4), (5) and vinylphosphonic acid or salts thereof and contain from 75 to 99.5% by weight, based on the weight of the copolymer, of structural units of one or more monomers selected from the group consisting of compounds of the
A process for improving the biodegradability of copolymers which contain from 75 to 99.5% by weight, based on the weight of the copolymer, of structural units of one or more monomers selected from the group consisting of compounds of the
Dependencies are inferred from the claim text.