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US 5,610,233 AGranted
Aqueous coating compositions containing cellulose esters
AssigneeEastman Chemical Company
InventorMahendra K. Sharma
Life of this patent
Estimating the term…
Abstract
This invention relates to aqueous coating compositions containing water soluble cellulose esters which are cross-linked with a resin system in the presence of an organic sulfonic acid catalyst for the formation of a film. The cellulose esters contain a low degree of substitution performed by solvolysis of cellulose esters of higher degree of substitution in the presence of a carboxylic acid catalyst.
Claims8
An aqueous coating composition comprising:
- (A) 1 to 60 weight percent of a water-soluble or water dispersible cellulose ester having a weight average molecular weight of 10,000 to 60,000, a hydroxyl value of 100 to 1,000, and an inherent viscosity of 0.05 to 1.5 dL/g, said cellulose ester containing a low degree of substitution in the range of 0.3 to 1.5;
- (B) 5 to 90 weight percent of an amino resin cross-linking agent;
- (C) 0.1 to 15 weight percent of an acid catalyst;
- and
- (D) 5 to 50 weight percent water,
- wherein the water-soluble or water dispersible cellulose ester when dissolved or dispersed in the water and mixed with the amino resin cross-linking agent in the presence of the acid catalyst forms a network of high molecular weight cross-linked polymer.
3 more elements
An aqueous coating composition comprising:
- (A) 5 to 50 weight percent of a water-soluble or water dispersible cellulose ester having a weight average molecular weight of 10,000 to 60,000, a hydroxyl value of 100 to 1,000, and an inherent viscosity of 0.05 to 1.5 dL/g, said cellulose ester containing a low degree of substitution in the range of 0.3 to 1.5;
- (B) 5 to 70 weight percent of an amino resin cross-linking agent;
- (C) 0.2 to 12 weight percent of an acid catalyst;
- and
- (D) 7 to 40 weight percent water,
- wherein the water-soluble or water dispersible cellulose ester when dissolved or dispersed in the water and mixed with the amino resin cross-linking agent in the presence of the acid catalyst forms a network of high molecular weight cross-linked polymer.
3 more elements
An aqueous coating composition comprising:
- (A) 10 to 35 weight percent of a water-soluble or water dispersible cellulose ester having a weight average molecular weight of 10,000 to 60,000, a hydroxyl value of 100 to 1,000, and an inherent viscosity of 0.05 to 1.5 dL/g, said cellulose ester containing a low degree of substitution in the range of 0.3 to 1.5;
- (B) 10 to 50 weight percent of an amino resin cross-linking agent;
- (C) 0.5 to 8 weight percent of an acid catalyst;
- and
- (D) 10 to 35 weight percent water,
- wherein the water-soluble or water dispersible cellulose ester when dissolved or dispersed in the water and mixed with the amino resin cross-linking agent in the presence of the acid catalyst forms a network of high molecular weight cross-linked polymer.
3 more elements
Dependencies are inferred from the claim text.