Biodegradable gas barrier container and process for...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...

Reexamination Certificate

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C524S395000, C524S445000, C524S447000, C524S449000, C524S451000

Reexamination Certificate

active

07981957

ABSTRACT:
A biodegradable gas barrier vessel comprising 100 parts of mass of a biodegradable polyester resin having a polylactic acid content of not less than 50% by mass and 0.1 to 10 parts by mass of a phyllosilicate. The degree of crystallization as measured by X-ray diffractometry is not less than 15%, and the coefficient of oxygen permeation as measured under conditions of 20° C. and relative humidity 90% is not more than 50 ml·mm/m2·day·MPa. Since the biodegradable polyester resin reinforced with the phyllosilicate has excellent heat resistance, the molded product can be heat treated at an elevated temperature. Such enhanced heat treatment conditions can further enhance the degree of crystallization of the polyester resin and thus can contribute to significantly improved gas barrier properties.

REFERENCES:
patent: 5866645 (1999-02-01), Pinnavaia et al.
patent: 2003/0149156 (2003-08-01), Okamoto et al.
patent: 2005/0043462 (2005-02-01), Yamada et al.
patent: 2002-241667 (2002-08-01), None
patent: 2003-82212 (2003-03-01), None
patent: 2003082212 (2003-03-01), None
patent: 2003-113326 (2003-04-01), None

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