Biodegradable cellulose ester composition and article

Details Biodegradable cellulose ester composition and article Biodegradable cellulose ester composition and article

1996-08-22

1998-02-24

Green, Anthony

Compositions: coating or plastic

Coating or plastic compositions

Carbohydrate or derivative containing

10617015, 10617026, 10617027, 10617051, 10617058, 1061711, 428532, 536 63, 536 69, C08L 108, C08L 110, C08L 112

Patent

active

057208034

ABSTRACT:
The composition comprising a cellulose ester including at least 10 weight % of a low-substituted cellulose ester having an average degree of substitu- tion not exceeding 2.15 and giving a 4-week decomposition rate of at least 60 weight % as determined using the amount of evolution of carbon dioxide as an indicator in accordance with ASTM 125209-91. The composition may contains a plasticizer, an aliphatic polyester, a photolysis accelerator such as anatase type titanium dioxide or a biodegradation accelerator such as organic acids and their esters. The low-substituted cellulose ester may be a cellulose ester having an average degree of polymerization from 50 to 250, an average degree of substitution from 1.0 to 2.15 and a residual alkali metal/alkaline earth metal-to-residual sulfuric acid equivalent ratio of 0.1 to 1.1. The biodegradable cellulose ester composition is suitable for the manufacture of various articles including fibrous articles such as tobacco filters.

REFERENCES:
patent: 3781381 (1973-12-01), Koleske et al.
patent: 4731122 (1988-03-01), Cortese et al.
patent: 5288318 (1994-02-01), Mayer et al.
patent: 5478677 (1995-12-01), Itoh et al.
patent: 5609677 (1997-03-01), Itoh et al.

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