Acylation process
AssigneeRhodia Acetow GmbH
InventorsJana Lubkoll, Armin Stein
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Abstract
The invention concerns a process for the manufacture of an acylated polymer composition comprising amylose and/or amylopectin, comprising a pre-treatment step in the presence of an acid, and optionally one additive selected from the group of a hydroxycarboxylic acid and a salt in combination with a polycarboxylic acid. After pre-treatment, the polymer is acylated and, preferably, subjected to a post-treatment step with an acid. The products obtained are useful as additives in varnishes, lacquers, coatings, thickeners, adhesives or binders, and preferably inks.
Claims20
A process for the manufacture of an acylated polymer composition comprising acylated amylose and/or acylated amylopectin, having a viscosity from between 10 to 200 mPas (35 w % in EtOAc at 25° C.), the method comprising:
- (a) pre-treating a polymer composition comprising amylose and/or amylopectin with an aqueous phase comprising one first additive selected from the group consisting of at least one acid A having a pKa of equal to or less than 4.8 at 25° C. and an enzyme, and optionally one or more second additives selected from the group consisting of at least one salt in combination with at least one polycarboxylic acid and at least one hydroxycarboxylic acid, to swell the amylose and/or amylopectin forming swollen amylose and/or swollen amylopectin;
- (b) reacting the pre-treated polymer composition comprising the swollen amylose and/or swollen amylopectin with an acylating agent to provide an acylated polymer composition comprising amylose and/or amylopectin;
- and
- (c) reacting the acylated polymer composition obtained in step (b) with at least one acid A′ with a pKa of equal to or less than 4.8 at 25° C., in the presence of water to partially hydrolyze the acylated polymer obtained in step (b),
- wherein the acylated polymer composition has a degree of substitution (DS) in the range of from 2.0 to 2.9.
A process for the manufacture of an acylated polymer composition comprising acylated amylose and/or acylated amylopectin, having a viscosity from between 10 to 200 mPas (35 w % in EtOAc at 25° C.), which comprises:
- (a) pre-treating a polymer composition comprising amylose and/or amylopectin with an aqueous phase comprising at least one acid A having a pKa of equal to or less than 4.8 at 25° C., and optionally one or more additives selected from the group consistinq of at least one salt in combination with at least one polycarboxylic acid and at least one hydroxycarboxylic acid, where the at least one acid A is added in an amount of equal to or greater than 0.01 weight percent;
- (b) reacting the pre-treated polymer composition with an acylating agent to provide an acylated polymer composition comprising amylose and/or amylopectin;
- and
- (c) reacting the acylated polymer composition obtained in step (b) with at least one acid A′ with a pKa of equal to or less than 4.8 at 25° C., in the presence of water to partially hydrolyze the acylated polymer obtained in step (b),
- wherein the acylated polymer composition has a degree of substitution (DS) in the range of from 2.0 to 2.9.
Dependencies are inferred from the claim text.