Polypropylene-based resin expanded beads and polypropylene-based resin expanded beads molded article
US11732101B2 · kind B2 · utility
0Cited by
4References
7Claims
0Family size
Assignee
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Key dates
| Filing date | Jan 21, 2021 |
| Grant date | Aug 22, 2023 |
| Priority date | — |
| Expiry date | Jan 21, 2041 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2423/14
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An expanded bead having a through hole and including a foamed core layer which defines the through hole therein and which is constituted of a resin composition containing two kinds of polypropylene-based resins having different melting points, and a cover layer covering the foamed core layer and constituted of a polyolefin-based resin. The expanded bead gives a DSC curve in which an endothermic peak intrinsic to the resin composition and another endothermic peak on a higher temperature side thereof appear in a specific heat of fusion ratio. Molded articles include a multiplicity of the expanded beads.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.