Aqueous dispersion useful in coatings containing hydrolyzed cellulose ester and acyrlic resin
AssigneeEastman Chemical Company
InventorsChung M. Kuo, Larry G. Curtis, Paul L. Lucas
Life of this patent
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Abstract
A stable aqueous dispersion and process for making the dispersion are provided containing hydrolyzed cellulose ester, organic solvent, water and acrylic resin having free acid functionalities that are at least partially neutralized. The dispersion is useful in coatings and can also contain surfactant and cross-linking agent.
Claims12
An aqueous dispersion composition comprising:
- (a) about 3 to 50 weight percent, hydrolyzed cellulose ester based on total solids;
- (b) about 40 to 95 weight percent acrylic resin, based on total solids, having free acid functionality that is at least partially neutralized;
- (c) about 0 to 10 weight percent surfactant based on total solids;
- (d) about 50 to 200 parts organic solvent per 100 parts hydrolyzed cellulose ester;
- and
- (e) an amount of water to render the dispersion usable in coating applications;
- wherein said hydrolyzed cellulose ester has a hydroxyl content of at least 3 weight percent based on the unit molecular weight of the hydrolyzed cellulose ester and the content of (a), (b), and (c) in the total composition is about 10 to 50 weight percent.
The dispersion composition according to claim wherein said cellulose acetate butyrate has a butyryl content of about 35 to 50 unit molecular weight percent and an acetyl content of less than 2 unit molecular weight percent.
A process for producing an aqueous dispersion comprising:
- (1) dissolving 100 parts hydrolyzed cellulose ester in 50 to 200 parts of an organic solvent to form a solution, so that the final amount of hydrolyzed cellulose ester is about 3 to 50 weight percent, based on total solids wherein the hydrolyzed cellulose ester has a hydroxyl content of at least 3 weight percent based on the unit molecular weight percent of the hydrolyzed cellulose ester;
- and
- (2) vigorously mixing water into said solution to form a dispersion wherein the mixing and amount of water are sufficient to render the dispersion usable in coating applications;
- wherein about 0 to 10 weight percent surfactant, based on total solids, is present in the solution prior to step (2) and about 40 to 95 weight percent acrylic resin, based on total solids, is present in the dispersion and having free acid functionality that is at least partially neutralized prior to contacting with water.
Dependencies are inferred from the claim text.