Modified expanded bead and foam molded article of expanded beads
US12202951B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 2020 |
| Grant date | Jan 21, 2025 |
| Priority date | — |
| Expiry date | Jan 6, 2042 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2423/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A modified expanded bead that includes an expanded bead which includes a specific base polymer (β) and a coating layer which includes a specific base polymer (α). The coating layer covers at least part of an outer surface of the expanded bead. The melting point Tα of the base polymer (α) and the melting point Tβ of the base polymer (β) satisfy a relationship of 0≤Tα−Tβ≤20. When the modified expanded bead is cut into two halves along a cutting plane to form two half portions and thereafter one of the two half portions is cut along planes perpendicular to the cutting plane to form ten small pieces, outermost pieces among the ten small pieces have a xylene-insoluble content (B) which is less than a xylene-insoluble content (A) in the half portion and the xylene-insoluble content (A) is 10-80% by mass.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.