Hollow foamed blow-molded article
US8435615B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 14, 2011 |
| Grant date | May 7, 2013 |
| Priority date | — |
| Expiry date | Oct 14, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/1397
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A hollow foamed blow-molded article has a polypropylene-based resin foam layer, wherein the polypropylene-based resin foam layer has an equilibrium compliance Je0 of 2.0×10−3 Pa−1 or more and a swell S of 2.5 or less, wherein the foam layer has an apparent density “d” of 0.20 to 0.65 g/cm3 and a ratio a/c of an average cell diameter “a” in the thickness direction of the molded article to an average cell diameter “c” in the longitudinal direction of the molded article of 0.1 to 0.5. The hollow foamed blow-molded article has an average molded article thickness T of 1 to 5 mm and a variation coefficient Cv of the molded article thickness of 50% or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.