Eastman-kodak Company

Eastman Chemical Company

Richard T Bogan

Chung-Ming Kuo

Kevin J Edgar

Richard J Brewer

Richard H Wang

Chung M Kuo

Claude M Shelton

The present invention relates to a process for preparing cellulose esters having a total DS/AGU of 0.1 to 3.0, said process consisting of contacting the following:

Direct process for the production of cellulose esters

The present invention relates to a process for preparing cellulose esters having a total DS/AGU of 0.1 to 3.0, said process comprising contacting the following:

The specification discloses a process for the manufacture of cellulose acetate. The process reacts, at a temperature suitable for acetylation, an acetic acid activated pretreated cellulose raw material containing 100 parts cellulose by dry weight, and 0.5 to 40 parts of a bisulfate catalyst by dry weight of the cellulose. The bisulfate catalyst is selected from lithium bisulfate, sodium bisulfate, and potassium bisulfate. To enhance mixing with the activated and pretreated cellulose, the catalyst may be mixed with 2 to 4 parts of acetic anhydride by dry weight of the cellulose, and 4 to 6 parts of acetic acid by dry weight of the cellulose. In a further embodiment, 0.05 to 10 parts of a strong Bronsted acid by weight of the dry cellulose may be added as a co-catalyst.

Process for the manufacture of cellulose acetate

The present invention provides a novel cellulosic material and a process for preparing the same. The cellulosic material is a carboxylated cellulose ester material having an acid number of at least about 5, an inherent viscosity of from about 0.01 to about 1.00 and wherein the anhydroglucose units thereof have ring substituents comprising by weight based on total polymer weight, of from about 0.05 to about 20% hydroxyl groups, from about 0.5 to about 44% acetyl groups, from 0 to about 54% butyryl groups, from 0 to about 47% propionyl groups, from about 0.4 to about 4.0% total carboxyl groups wherein from about 20% to about 100% of these carboxyl groups are non-saponifiable backbone, and wherein the material has a lactone level of from about 4.52.times.10.sup.-5 to about 6.13.times.10.sup.-4. The carboxylated cellulose esters of the present invention are prepared by reacting a cellulose ester with ozone at a temperature of about 25.degree. to 80.degree. C. for a period of time sufficient to yield the carboxylated cellulose ester product. Also disclosed are end use applications for the carboxylated cellulose esters, such as metal coatings, pigment dispersions, wood coatings, inks, etc.

Carboxylated cellulose ester and manufacture thereof

Improved method for bleaching cellulose esters, such as cellulose acetate, cellulose acetate propionate and cellulose acetate butyrate, by adding during the hydrolysis reaction of the cellulose ester at from 80.degree. C. to 150.degree. C. a bleaching agent mixture of hydrogen peroxide and at least one monopersulfate salt selected from the group consisting of sodium, potassium and lithium or mixtures thereof.

High temperature bleaching method for cellulose esters

This invention is directed to processable cellulose esters having excellent adhesion to metal substrates and weatherability. These commercially useful cellulose ester compositions can be molded, extruded over metal foils, shaped and otherwise processed in a thermoplastic condition at elevated temperatures to provide products having improved ultraviolet light stability or weatherability and good color stability.

Processable cellulose ester compositions

Improved method for preparing cellulose acetate powder, particularly extrusion-grade powder, by direct precipitation, with the precipitation step occurring at a temperature of about 65.degree. C. to about 95.degree. C. and with the coagulating agent subsequently being removed from the resulting liquid powder slurry also at a temperature of about 65.degree. C. to about 95.degree. C.; and the cellulose acetate powder product resulting from the improved method, the powder being particularly adapted to take up plasticizer up to about 50 percent by weight and still flow uniformly without caking or becoming tacky.

Direct precipitation method for producing extrusion-grade cellulose

This invention is directed to a new thermal stabilizer system for cellulose esters and their commercially useful formulated compositions which can be molded, shaped and otherwise processed in a thermoplastic condition at elevated temperatures to provide products having (1) better molecular weight retention and (2) less discoloration after thermal processing when compared to similar cellulose ester compositions containing prior art stabilizers.

Cyclic phosphonite stabilized cellulose ester compositions

A melt phase process for the preparation of emulsifiable polyethylene waxes by reacting polyethylene waxes with an unsaturated polycarboxylic component in the presence of a free radical source in the substantial absence of oxygen.

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Kingsport, TN, United States of America

Richard T Bogan