Process for preparing a degradable high polymer network

Details Process for preparing a degradable high polymer network Process for preparing a degradable high polymer network

1993-01-15

1993-08-24

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 95, 521 97, 521182, C08J 910

Patent

active

052389685

ABSTRACT:
A degradable polymer network obtained by adding from 0.2 to 10 parts by weight of a foaming agent to 100 parts by weight of a polylactic acid-base resin composition comprising from 80 to 100% by weight of polylactic acid or a lactic acid-hydroxycarboxylic acid copolymer and from 0 to 20% by weight of a plasticizer, conducting melt-foaming extrusion of resulting mixture, and opening the foam cells in the extrudate. The high polymer network is characterized in suitable flexibility and hydrolyzability and thus useful as a material for absorbing of oils and body fluids, screens for sunlight, heat-insulating materials, filter media and packaging materials; and does not accumulate as industrial wastes because of hydrolyzability in the natural environment, even though abandoned after use.

REFERENCES:
patent: 1995970 (1935-03-01), Dorough
patent: 4181983 (1980-01-01), Kulkarni
patent: 4702917 (1987-10-01), Schindler
patent: 4719246 (1988-01-01), Murdock et al.
patent: 4766182 (1988-08-01), Murdock et al.
"WPIL Week" 2289, AN89-161889.
J.P.-A-1 104635 Apr. 21, 1989.

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