Biodegradable oxidized cellulose esters

Details Biodegradable oxidized cellulose esters Biodegradable oxidized cellulose esters

Filed on

2005-12-13

Date issued

2010-02-16

Examiner

Jiang, Shaojia Anna (Department: 1623)

Patent Class

Drug, bio-affecting and body treating compositions

SubClass

Designated organic active ingredient containing

SubSubClass

Carbohydrate doai

Other Related Categories

C536S032000, C536S063000, C536S064000, C536S067000, C536S068000, C536S069000

Type

Reexamination Certificate

Status

active

Patent number

07662801

Description

ABSTRACT:
The present invention relates to the preparation of a series of oxidized cellulose esters suitable for use as a drug carrier in the development of biodegradable controlled and/or sustained release pharmaceutical, agricultural, and veterinary compositions, such as films, compacts, microspheres, and pellets. The esters are prepared by acylation of oxidized cellulose having at least 3% carboxyl groups. The resulting oxidized cellulose esters are soluble in aqueous alkaline solutions, water, and a variety of organic solvents.

REFERENCES:
patent: 2379917 (1945-07-01), Mark et al.
patent: 4590265 (1986-05-01), Bogan et al.
patent: 5008385 (1991-04-01), Diamantoglou
patent: 5970988 (1999-10-01), Buchanan et al.
patent: 5973139 (1999-10-01), Lee et al.
patent: 5981738 (1999-11-01), Cook et al.
Chemical Abstracts, vol. 51, No. 1, Jan. 10, 1957, Columbus, OH, US; Abstract No. 701g, Toshikazu Fujimura et al., “The Acetylation of oxycellulose” XP002210935, Abstract & Chem. High Polymers, vol. 12, 1955, pp. 315-321, XP008007015.

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