Polyethylene foams and methods of their production
US6376059B1 · kind B1 · utility
66Cited by
34References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 2, 1999 |
| Grant date | Apr 23, 2002 |
| Priority date | — |
| Expiry date | Feb 2, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/253
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
High-density polyethylene (HDPE) foams that are essentially free of residual chemical blowing agents and reaction-by-products of chemical blowing agent are provided. The HDPE foams can be either microcellular foams or conventional foams. She foams can be produced in extrusion, injection molding, and blow molding processes that utilize a physical blowing agent. Specific die designs useful for making high quality foams are described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.