Extruded styrene resin foams, and methods for producing the same
US6696504B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1999 |
| Grant date | Feb 24, 2004 |
| Priority date | — |
| Expiry date | Dec 23, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/91
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Production of extruded styrene resin foams which are excellent in environmental compatibility and retain highly efficient thermal insulation property and have appropriate strength properties is disclosed which is characterized by using as a blowing agent a blowing agent comprising mainly 40% by weight or more and 85% by weight or less, based on the whole amount of the blowing agent, of at least one ether selected from the group consisting of dimethyl ether, methyl ethyl ether and diethyl ether, and 15% by weight or more and 60% by weight or less, based on the whole amount of the blowing agent, of at least one saturated hydrocarbon selected from the group consisting of saturated hydrocarbons having 3 to 5 carbon atoms. The production is further characterized by providing a more desirable cell structure such as a specified shape of cells or the presence of larger and smaller cells.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.