Fatty acid vinyl ester copolymers with wax qualities
AssigneeWacker Chemie AG
InventorsChristian Bruckmeier, Barbara Moser, Marina Bareuther
Life of this patent
Estimating the term…
Abstract
Subject-matter of the invention are processes for preparing fatty acid vinyl ester copolymers by radically initiated polymerization of a) one or more vinyl esters of carboxylic acids having 16 to 22 carbon atoms and b) one or more vinyl esters of carboxylic acids having 2 to 15 carbon atoms, with one or more vinyl esters a) and one or more vinyl esters b) being metered in during the polymerization, characterized in that during the polymerization either the metering rate of vinyl ester a) or the metering rate of vinyl ester b) is reduced and the metering rate of the other of the two vinyl esters, a) or b), is increased.
Claims18
A method for preparing fatty acid vinyl ester copolymers by free-radical initiated polymerization of
- a) one or more vinyl esters of carboxylic acids having 16 to 22 carbon atoms and
- b) one or more vinyl esters of carboxylic acids having 2 to 15 carbon atoms,
- wherein the one or more vinyl esters a) and the one or more vinyl esters b) are metered in during the polymerization, and
- during the polymerization either a metered addition rate of vinyl ester a) or a metered addition rate of vinyl ester b) is reduced and the metered addition rate of the other of the two vinyl esters a) or b) is increased.
A fatty acid vinyl ester copolymer obtained by free-radical initiated polymerization of
- a) one or more vinyl esters of carboxylic acids having 16 to 22 carbon atoms and
- b) one or more vinyl esters of carboxylic acids having 2 to 15 carbon atoms, wherein:
- (i) the one or more vinyl esters a) and the one or more vinyl esters b) are metered in during the polymerization;
- (ii) during the polymerization either a metered addition rate of vinyl esters a) or a metered addition rate of vinyl esters b) is reduced and the metered addition rate of the other of the two vinyl esters a) or b) is increased;
- (iii) 15 to 50% by weight of total vinyl esters V1) used are metered in up to a time point at which 1 to 10% of total vinyl esters V2) used are metered in;
- and/or 30 to 70% by weight of the total vinyl esters V1) used are metered in up to a time point at which 20 to 30% by weight of the total vinyl esters V2) used are metered in;
- (iv) the one or more vinyl esters a) or b), whose metered addition rate is reduced during the polymerization, is referred to as vinyl ester V1) and the one or more vinyl esters a) or b), whose metered addition rate is increased during the polymerization, is referred to as vinyl ester V2);
- and
- (v) the fatty acid vinyl ester copolymer is a gradient polymer comprising a gradient in a distribution of units of vinyl esters a) and vinyl esters b) along a polymer chain thereof.
Dependencies are inferred from the claim text.