Cellulose derivatives having gel-like rheological properties...

Details Cellulose derivatives having gel-like rheological properties... Cellulose derivatives having gel-like rheological properties...

2005-10-25

2005-10-25

Price, Elvis O. (Department: 1623)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbohydrates or derivatives

C536S084000, C536S090000, C536S091000, C536S095000, C536S096000

Reexamination Certificate

active

06958393

ABSTRACT:
A description is given of cellulose derivatives having gel-like rheological properties in aqueous solution characterized in that:a) cellulose is alkalized with aqueous alkali metal hydroxide solution in the presence of a suspension medium,b) the alkalized cellulose is reacted with one or more alkylene oxides,c) then reacted with an alkyl halide present in the suspension mediumd) subsequently or simultaneously the alkalized cellulose is reacted with a crosslinking agent in an amount of 0.0001 to 0.05 eq, where the unit “eq” represents the molar ratio of crosslinking agent relative to the anhydroglucose unit (AGU) of the cellulose used, ande) after, if appropriate, further addition of alkali metal hydroxide and/or alkylating agent, the resultant irreversibly crosslinked cellulose derivative is separated off from the reaction mixture, if appropriate purified and dried.

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Dannhorn et al. (EP 1180526 A1) (Process for the preparation of alkyl hydroxyalkyl cellulose) (Abstract Sent).
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