Biodegradable cellulose ester composition and article

摘要

A cellulose ester composition is described which comprises (i) a cellulose ester having (a) an average degree of substitution not exceeding 2.15 and (b) an average polymerization degree of 50 to 250, and (c) having a 4-week decomposition rate of not less than 60 % by weight as determined using the amount of evolved carbon dioxide as an indicator in accordance with ASTM D 5209, or (ii) a cellulose ester having characteristics (a) and (b), and (d) having an equivalent ratio of residual alkali metal or alkaline earth metal to residual sulphuric acid in said cellulose ester 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.