Acylation process
AssigneeSOLVAY ACETOW GmbH
InventorsJana Lubkoll, Armin Stein
Life of this patent
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Abstract
A process for the manufacture of an acylated polymer composition including amylose and/or amylopectin, including 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.
Claims22
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 comprising 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 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 a first acylated polymer composition comprising acylated amylose and/or acylated amylopectin with a degree of substitution (DS) of greater than 2.9;
- and (c) reacting the first 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 produce a final acylated polymer composition comprising acylated amylose and/or acylated amylopectin having a DS in the range consisting of 2.05 to 2.75.
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 comprising 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 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 a first acylated polymer composition comprising acylated amylose and/or acylated amylopectin with a degree of substitution (DS) of greater than 2.9;
- 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 produce a final acylated polymer composition comprising acylated amylose and/or acylated amylopectin having a DS in the range consisting of 2.05 to 2.85.
An acylated polymer composition comprising acylated amylose and/or acylated amylopectin, having a viscosity equal to or greater than 50 mPas (10 w % in Triacetin at 30° C.), which is made by a process comprising the following steps:
- (a) pre-treating a polymer composition comprising amylose and/or amylopectin with an aqueous phase comprising 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 to swell the amylose and/or amylopectin;
- (b) reacting the pre-treated polymer composition with an acylating agent to provide an produce a first acylated polymer composition comprising acylated amylose and/or acylated amylopectin with a degree of substitution (DS) of greater than 2.9;
- and
- (c) reacting the first 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 produce the final acylated polymer composition comprising acylated amylose and/or acylated amylopectin having a DS in the range consisting of 2.05 to 2.85.
An acylated polymer composition comprising acylated amylose and/or acylated amylopectin, having a degree of substitution (DS) in the range consisting of from 2.05 to 2.85 and which has a EtOH tolerance of equal to or lower than 60% (v/v).
Dependencies are inferred from the claim text.