Process for manufacturing polymers of bicyclo [2.2.1] heptene-2 and its substitution derivatives
US4020021A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1975 |
| Grant date | Apr 26, 1977 |
| Priority date | — |
| Expiry date | Mar 25, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/909
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Process for manufacturing finely divided polymers of bicyclo [2.2.1] heptene-2 compound comprising the steps of incompletely polymerizing said bicyclo [2.2.1] heptene-2 compound by the ring opening polymerizing technique in the presence of a catalyst system selected from the group comprising a compound of a noble metal of the platinum family and an alcohol-reducing solvent and tungsten hexachloride, an aluminum alkyl and an aromatic solvent, under superatmospheric pressure and in the presence of a quantity of solvent at least equal to that necessary for the solution of said catalyst system and abruptly reducing said pressure at a temperature higher than the vaporization temperature of the reaction mixture under said reduced pressure, whereby an expansion, a division and at least partial drying of the resulting polymer is obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.