Microcellular foams of semi-crystaline polymeric materials
US5160674A · kind A · utility
151Cited by
22References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 22, 1990 |
| Grant date | Nov 3, 1992 |
| Priority date | — |
| Expiry date | Mar 22, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/13
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for producing microcellular foam from a semi-crystalline polymeric material. The material is heated to its melting point at an elevated pressure and then saturated with a uniform concentration of a gas. The pressure is then lowered causing bubble nucleation and growth within the material. The material is then quenched to prevent further foaming. Bubbles on the order of 5 .mu.m in diameter are produced with a bubble density of approximately 10.sup.10 bubbles/cm.sup.3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.