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US 2004/0106786 A1Published application
Alkylene oxide modified hardwood cellulose
AssigneeRayonier Inc.
InventorsKarl D. Sears, Wendy Hendricks
Life of this patent
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Abstract
Disclosed is a process for producing reactive cellulose for use in the manufacture of cellulose acetate having superior clarity by mercerizing hardwood cellulosic material and reacting it with an hydroxyalkylating agent to a degree of molar substitution ranging from 0.04 to 0.15 per anhydroglucose unit in cellulose.
Claims7
A process for the preparation of cellulose acetate-comprising:
- mercerizing cellulosic material derived from hardwood in a caustic mercerizing solution to produce mercerized hardwood cellulose;
- reacting the mercerized hardwood cellulose with an alkylene oxide hydroxyalkylating agent to a degree of substitution of the cellulose ranging from 0.04 to 0.15 to form a reactive mercerized hardwood cellulose, said degree of substitution being insufficient to render said mercerized hardwood cellulose appreciably soluble in water;
- recovering said reactive substantially water insoluble mercerized hardwood cellulose and acetylating it to form cellulose acetate.
Dependencies are inferred from the claim text.