Process for foaming plastics
US4288560A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 1980 |
| Grant date | Sep 8, 1981 |
| Priority date | — |
| Expiry date | Aug 25, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J9/08
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for foaming thermoplastic materials by adding to the plastics material 0.05 to 5 percent by weight of a dioxazolone of the formula I ##STR1## in which n is 1, 2 or 3, and when n is 1 PA1 R is C.sub.1 -C.sub.12 -alkyl, C.sub.2 -C.sub.12 -alkenyl, C.sub.7 -C.sub.9 -aralkyl, C.sub.3 -C.sub.6 -cycloalkyl, C.sub.6 -C.sub.10 -aryl, or phenyl substituted by C.sub.1 -C.sub.9 -alkyl, halogen, C.sub.1 -C.sub.9 -alkoxy or nitro, or it is a heterocyclic radical, or when n is 2 PA1 R is C.sub.1 -C.sub.8 -alkylene, ethenylene, m- or p-phenylene, m- or p-halophenylene, biphenylene, oxy-bis-(p-phenylene), 2,5-thienylene, 2,5-furylene, 2,6-pyridylene or naphthylene, or when n is 3 PA1 R is phenenyl, and subsequently heating the mixture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.