Method of preparing cellulose esters
AssigneeEastman Kodak Company
InventorBrice S. Wininger
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Abstract
Disclosed is a method of preparing lower fatty acid esters of cellulose which comprises esterifying at a temperature of between about 75.degree. C. and about 110.degree. C. a cellulose compound having esterifiable hydroxyl groups with an esterifying bath comprising an organic acid anhydride, a diluent, and from about 0.3% to about 3.0% by weight, based on the weight of cellulose, of a catalyst selected from p-toluene sulfonic acid, methane sulfonic acid, methane disulfonic acid or m-benzene disulfonic acid.
Claims6
A method of preparing lower fatty acid esters of cellulose which comprises esterifying at a temperature of between about 75.degree. C. and about 110.degree. C. a cellulose compound having esterifiable hydroxyl groups with an esterifying bath comprising an organic acid anhydride, a diluent, and from about 0.3% to about 3.0% by weight, based on the weight of cellulose, of a catalyst selected from the group consisting of p-toluene sulfonic acid, methane sulfonic acid, methane disulfonic acid and m-benzene disulfonic acid, the weight ratio of said bath to the cellulose being between about 5:1 to about 10:1.
A method of preparing lower fatty acid esters of cellulose which comprises esterifying at a temperature of between about 85.degree. C. and about 95.degree. C. a cellulose compound having esterifiable hydroxyl groups with an esterifying bath comprising an organic acid anhydride, a diluent, and from about 0.5% to about 1.0% by weight, based on the weight of cellulose, of a catalyst selected from the group consisting of p-toluene sulfonic acid, methane sulfonic acid, methane disulfonic acid and m-benzene disulfonic acid, the weight ratio of said bath to the cellulose being between about 5:1 to about 10:1.
Dependencies are inferred from the claim text.