Biodegradable cellulose ester composition and article

Compositions: coating or plastic – Coating or plastic compositions – Carbohydrate or derivative containing

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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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