Polymer foams
US6239187A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 1998 |
| Grant date | May 29, 2001 |
| Priority date | — |
| Expiry date | Sep 10, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2314/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to foams comprising cycloolefin copolymers. The foam of the invention comprises at least one cycloolefin copolymer which comprises PA1 from 0.1 to 100% by weight, based on the total mass of the cycloolefin copolymer, of polymerized units derived from one or more polycyclic olefins having one or more norbornene units and PA1 from 0 to 99% by weight, based on the total mass of the cycloolefin copolymer, of polymerized units derived from one or more acyclic olefins of the formula ##STR1## PA1 where R.sup.i, R.sup.ii, R.sup.iii and R.sup.iv are identical or different and are each a hydrogen atom, a linear, branched, saturated or unsaturated C.sub.1 -C.sub.20 -hydrocarbon radical or a C.sub.6 -C.sub.18 -aryl radical and PA2 from 0 to 99% by weight, based on the total mass of the cycloolefin copolymer, of polymerized units of one or more monocyclic olefins of the formula VIII ##STR2## PA2 where n is a number from 2 to 10, and voids which can contain one or more gaseous substances.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.