Polymer resulting from the cure of a preformed chromene-containing mixture
US5155196A · kind A · utility
24Cited by
28References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1990 |
| Grant date | Oct 13, 1992 |
| Priority date | — |
| Expiry date | Jun 1, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D311/58
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
This invention relates to a solvent process for the conversion of aromatic propargyl ethers into chromenes. The process can be catalyzed with copper or zinc salts. The preferred salt is cuprous chloride. The most preferred solvent is a dichlorobenzene. The invention also relates to chromene products formed using the process and to the polymerization of that chromene product and its polymerized product, the latter product having substantially improved flexural modulus and flexural strength properties. The polymerized product is also moisture insensitive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.