Nucleating agents for thermoplastic resins
US5032621A · kind A · utility
20Cited by
6References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 30, 1989 |
| Grant date | Jul 16, 1991 |
| Priority date | — |
| Expiry date | Oct 30, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/908
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
This invention relates to the use of a special class of sulfonic and phosphonic acids, and salts of the acids, to give improved nucleation for foam extrusion of thermoplastics using either dissolved gas or chemical blowing agents to produce foam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.