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US 5,223,546 AGranted
High polymer network
AssigneeMitsui Toatsu Chemicals, Inc.
InventorsKenji Morita, Kohichi Uchiki, Hosei Shinoda
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AssigneeMitsui Toatsu Chemicals, Inc.
InventorsKenji Morita, Kohichi Uchiki, Hosei Shinoda
Estimating the term…
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 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.
A degradable high polymer network having mesh structure comprising fibrous branches of polylactic acid or a lactic acid-hydroxycarboxylic acid copolymer.
A degradable high polymer network having mesh structure comprising fibrous branches of the high polymer and obtained by the process comprising 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.
Dependencies are inferred from the claim text.