Polymer compositions for the production of articles of biodegradable plastics material and methods of their preparation
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United States of America Patent
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Nov 2, 1993
Grant Date -
N/A
app pub date -
Mar 27, 1991
filing date -
Aug 7, 1989
priority date (Note) -
Expired
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Abstract
Polymer compositions useful for the production of articles of biodegradable plastics material with improved biodegradability include destructed starch and a polymer selected from the group consisting of ethylene-vinyl alcohol, polyvinyl alcohol and mixtures thereof wherein at least a portion of the said polymer is modified by the substitution of from 0.1 to 5 molar % of the functional alcohol groups in the polymer chain by X groups in which X is an oxo or an alkyl carbonyl group in which the alkyl group contains from 1 to 4 carbon atoms.
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