Process for forming polylactide expanded bead foam
US11739190B2 · kind B2 · utility
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2References
13Claims
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Key dates
| Filing date | Aug 21, 2019 |
| Grant date | Aug 29, 2023 |
| Priority date | — |
| Expiry date | Sep 6, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2467/04
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Expanded poly(lactide) (PLA) beads are made by pressurizing PLA beads with carbon dioxide at approximately room temperature, heating the beads under pressure to 90 to 160 C to saturate and partially crystallize the beads, and then depressurizing and cooling the beads. The PLA beads contain a blend of PLLA and PDLA in certain ratios. The beads are useful for making expanded bead foam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.