Sulphonyltetrazoles as chemical blowing agents
US4126590A · kind A · utility
4Cited by
2References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 28, 1977 |
| Grant date | Nov 21, 1978 |
| Priority date | — |
| Expiry date | Oct 28, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J9/108
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Sulfonyltetrazoles of formula I, ##STR1## wherein n is 1 or 2, A is alkylene and R is a mono- or divalent hydrocarbon residue, are usable as blowing agents for thermoplastic polymers. These compounds decompose at temperatures above 200.degree. C, therefore they can be used preferably for foaming thermoplasts of higher softening temperature such as aromatic polycarbonates, polyesters or polyethers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.