Expanded material and laminate

Details Expanded material and laminate Expanded material and laminate

1996-11-26

2000-03-14

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

528361, C08J 900

Patent

active

060373849

ABSTRACT:
The present invention provides a biodegradable expanded material having excellent expandability, moldability, impact resistance, heat resistance and storage stability. The present invention also provides a process for the preparation of the foregoing expanded material. The present invention further provides a laminate of a non-expanded material layer and an expanded material layer prepared from the foregoing expanded material which exhibits excellent impact resistance and heat resistance and an excellent transparency in the non-expanded material even after heat treatment so that a pattern printed on the inner side of the non-expanded material layer can be clearly viewed from the outside. A novel expanded material is provided made of a hydroxycarboxylic acid based polyester having a weight-average molecular weight of from 20,000 to 400,000 comprising as structural units a structural unit derived from hydroxycarboxylic acid, a structural unit derived from molecular weight increasing agent and/or a structural unit derived from polymerization catalyst deactivator.

REFERENCES:
patent: 5314927 (1994-05-01), Kondo et al.
patent: 5321052 (1994-06-01), Taka
patent: 5362765 (1994-11-01), Taka
patent: 5661193 (1997-08-01), Khemani

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