Patent · US Active

Methods of manufacture of polylactic acid foams

US8283389B2 · kind B2 · utility

0Cited by

2References

25Claims

0Family size

Assignee

BIOPOLYMER NETWORK LIMITED · NZ

Inventors

Michael Witt · Ludwigshafen, DE
Samir Shah · Ahmedabad, IN

Key dates

Filing date	Jan 30, 2008
Grant date	Oct 9, 2012
Priority date	—
Expiry date	Nov 7, 2028

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J2367/04
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

Method of forming a composition comprising impregnated polylactic acid (PLA) resin beads, by impregnating PLA resin beads with CO2. The method is carried out by contacting the beads with liquid CO2, and holding the impregnated beads at a temperature and pressure that prevents the beads from foaming while allowing the level of impregnated CO2 to reduce to about 4 to 20 weight % relative to the total weight of the beads and CO2.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.