Acylation process
AssigneeSOLVAY 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 a hydroxycarboxylic acid, subsequent acylation and, preferably, a post-treatment step with an acid. The products obtained are useful as additives in inks, varnishes, lacquers, coatings, thickeners, adhesives or binders.
Claims18
A process for the manufacture of an acylated polymer composition comprising acylated amylose and/or acylated amylopectin, having a viscosity of equal to or greater than 50 mPas (10 w % in Triacetin at 30° C.), the process comprises:
- (a) pre-treating by contacting a polymer composition comprising amylose and/or amylopectin with an aqueous phase consisting of 5 to 20 weight % water, one 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 additionally at least one hydroxycarboxylic acid, and optionally at least one organic solvent selected from the group consisting of dichloromethane and toluene, to swell the amylose and/or amylopectin;
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- (b) reacting the pre-treated polymer composition with an acylating agent until complete dissolution of the slurry formed initially in step (a) to produce the acylated polymer composition comprising the acylated amylose and/or acylated amylopectin.
A process for the manufacture of an acylated polymer composition comprising acylated amylose and/or acylated amylopectin, having a viscosity of equal to or greater than 50 mPas (10 w % in Triacetin at 30° C.), the process comprises:
- (a) pre-treating by contacting a polymer composition comprising amylose and/or amylopectin with an aqueous phase consisting of 5 to 20 weight % water, one 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 additionally at least one hydroxycarboxylic acid, and optionally at least one organic solvent selected from the group consisting of dichloromethane and toluene, to swell the amylose and/or amylopectin;
- (b) reacting the pre-treated polymer composition with an acylating agent until complete dissolution of the slurry formed initially in step (a) to produce the acylated polymer composition;
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- (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.
Dependencies are inferred from the claim text.