Polyamide ester rheological additive, a solution containing the additive and thickened compositions containing the additive
AssigneeRheox, Inc.
InventorsWilliam W. Reichert, Murray C. Cooperman
Life of this patent
Estimating the term…
Abstract
A polyamide (or oligomeric amide) ester rheological additive especially for organic solvent-based compositions comprises the reaction product of a defined polycarboxylic acid, a diamine, an alkoxylated polyol and a capping agent. The additive exhibits excellent efficiency and ease of dispersibility and is especially effective when first predispersed in an organic solvent. Organic solvent-based compositions which may be thickened by using the rheological additive are aliphatic, aromatic, and some moderately polar solvent-based compositions.
Claims14
A rheological additive comprising the reaction product of:
- a) polycarboxylic acid having at least 5 carbon atoms per acid group
- b) a first active hydrogen compound having the formula X.sub.m --R--Y.sub.n, wherein R represents a group containing from 2 to 12 carbon atoms, X and Y are groups independently selected from primary amino, secondary amino and hydroxyl, m and n are at least 1 and the sum of (m+n) is at least 2 and at least 90% of the X and Y groups participating in the reaction being primary amino, secondary amino and a mixture thereof;
- c) a second active hydrogen compound containing two active hydrogen functionalities wherein the hydrogen compound is represented by one of the following formulas:
- H--(OCH.sub.2 CH.sub.2).sub.n --OH
- wherein
- n=8-50 or ##STR4## wherein q+r=2-50, R.sub.1 is a long chain alkyl group C.sub.12 -C.sub.22, s is zero or one, and R is one of hydrogen, methyl and ethyl;
- and
- (d) capping agent.
A pre-dispersed mixture of a rheological additive in an organic solvent, said rheological additive comprising the reaction product of:
- a) polycarboxylic acid having at least 5 carbon atoms per acid group;
- b) a first active hydrogen compound having the formula X.sub.m --R--Y.sub.n, wherein R represents a group containing from 2 to 12 carbon atoms, X and Y are groups independently selected from primary amino, secondary amino and hydroxyl, m and n are at least 1 and the sum of (m+n) is at least 2 and at least 90% of the X and Y groups participating in the reaction being primary amino, secondary amino and a mixture thereof;
- c) a second active hydrogen compound containing two active hydrogen functionalities wherein the hydrogen compound is represented by one of the following formulas:
- H--(OCH.sub.2 CH.sub.2).sub.n --OH
- wherein
- n=8-50 or;
- ##STR5## wherein q+r=2-50, R.sub.1 is a long chain alkyl group C.sub.12 -C.sub.22, is zero or one, and R is one of hydrogen, methyl and ethyl, and
- d) capping agent.
A thickened organic composition containing the rheological additive in an amount sufficient to prevent formation of large agglomerates as may develop during storage, said rheological additive comprising the reaction product of:
- a) polycarboxylic acid having at least 5 carbon atoms per acid group
- b) a first active hydrogen compound having the formula X.sub.m --R--Y.sub.a, wherein R represents a group containing from 2 to 12 carbon atoms, X and Y are groups independently selected from primary amino, secondary amino and hydroxyl, m and n are at least 1 and the sum of (m+n) is at least 2;
- c) a second active hydrogen compound containing two active hydrogen functionalities wherein the hydrogen compound is represented by one of the following formulas:
- H--(OCH.sub.2 CH.sub.2).sub.n OH
- wherein
- n=8-50 or ##STR6## wherein q+r=2-50, R.sub.2 is a long chain alkyl group C.sub.12 -C.sub.22, s is zero or one, and R is one of hydrogen, methyl and ethyl, and
- (d) capping agent.
Dependencies are inferred from the claim text.