Eastman-kodak Company

Other

Eastman Chemical Company

Benedict M Lee

James E Harris

Jessica Dee Posey-Dowty

Chung-Ming Kuo

Larry Gerald Curtis

Charles S Winebarger

Gary W Gibson

A process for preparing a carboxylated cellulose ester from oxidized cellulose is described. The carboxylated cellulose esters have improved solvent solubility and coating resin compatibility when compared to cellulose esters made from regular grade cellulose. The process comprises activating the oxidized cellulose with water. The activated oxidized cellulose is then dehydrated by displacing the water with acetic acid and optionally displacing at least some of the acetic acid with butyric acid or propionic acid. After dehydration the activated cellulose is reacted with an esterifying reagent in the presence of a catalyst at about 0.degree. C. The temperature is gradually increased to a level sufficient to complete reaction and to obtain an intrinsic viscosity ranging from about 0.2 to about 1.6 dl/g. The reacted solution is then hydrolyzed to obtain a hydroxyl content ranging from about 0.05 to about 1.0. The catalyst is neutralized with a neutralizing agent and the solution is optionally filtered and the carboxylated cellulose ester is then precipitated with a precipitating agent. The invention also relates to carboxylated cellulose esters prepared by the process described above as well as high solids coating compositions containing carboxylated cellulose esters made by the above process.

Carboxylated cellulose esters

A method for producing ultra fine denier cellulose acetate fibers that entails spinning a spinning solution containing adequately high amounts of cellulose acetate in acetone wherein the cellulose acetate has a falling ball viscosity of 15 to 70 seconds wherein the spinning is conducted through spinnerettes having holes that have a diameter of less than 36 microns followed by drying at a temperature of about 50.degree. to 80.degree. C. at a draw ratio of 0.9 to 1.7.

Process for the production of fine denier cellulose acetate fibers

Disclosed is a novel tobacco smoke filter material comprising a filter element such as cellulose acetate crimped tow having at least about 1 weight percent of micro acicular crystals of a compound such as sodium carbonate present on the surfaces of the filter element. Also disclosed is a process for preparation of such tobacco smoke filter material comprising immersing the filter element in a solution of the compound capable of forming the micro acicular crystals, followed by removing the filter element from the solution and removing residual liquid, thereby forming the novel tobacco smoke filter material.

Process for the production of tobacco smoke filters

Disclosed is a novel process of preparing tobacco smoke filter material, wherein an acidic compound such as citric acid is dissolved in a cellulose acetate spinning solution prior to spinning the filaments of the filter material.

Tobacco smoke filter material and process for production thereof

Disclosed is a novel process of preparing tobacco smoke filter material, wherein an acidic compound such as citric acid is dissolved in a cellulose acetate spinning solution (dope) prior to spinning the filaments of the filter material.

Disclosed is a novel tobacco smoke filter material comprising a filter element such as cellulose acetate crimped tow having at least about 1 weight percent of micro acicular crystals of a compound such as sodium carbonate present on the surfaces of the filter element. Also disclosed is a process for preparation of such tobacco smoke filter material.

Tobacco smoke filters and process for production thereof

Device for connection to the outlet end of a gas jet tow puddler for puddling filamentary tow into a container, the device having a downwardly sloped gas-impervious plate positioned downstream from the gaseous jet outlet and against which filamentary tow impinges, becomes slowed and then cascades downwardly therealong; and a gas-impervious cylindrical shell opposed to and spaced from the exit end of the downwardly sloped plate and against which the filamentary tow travels from the downwardly sloped plate for subsequent slowing and movement therealong and then dropping from the cylindrical shell into the container below.

Tow deflector device for puddling jet

Filamentary tow is puddled into a container from an air jet through an air dissipator apparatus, which slows the air-propelled tow by the tow impinging upon the dog-legged surfaces along the flow path within the apparatus and ricocheting therefrom while the propelling air is dissipated from the tow as the tow moves along the flow path and out of the apparatus for subsequent disposition into a container or the like that may be positioned below the air jet and the air dissipator apparatus connected to the end of the air jet.

Growing community of inventors

Kingsport, TN, United States of America

Benedict M Lee