Polymerization of difunctional ring compounds
US4690992A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1986 |
| Grant date | Sep 1, 1987 |
| Priority date | — |
| Expiry date | Apr 24, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F17/00
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A difunctional monomer containing a strained olefin ring and an unstrained olefin, ether group or other group polymerizable with Lewis acid or Ziegler-Natta coordination catalyst by forming a complex of the monomer and Cp.sub.2 TiCH.sub.2 (Cp is .eta..sup.5 --C.sub.5 H.sub.5) and heating the complex in presence of excess monomer to above the decomposition point. A controlled, selective opening of the ring with the strained olefin occurs to form a linear, soluble polymer having the non-polymerized group pendant from the chain. An improved catalyst is formed by preparing the catalyst with a base such as 4-dimethylaminopyridine that forms an insoluble adduct with AlR.sub.2 Cl which is precipitated and removed. Aluminum can also be eliminated by using a precursor of the formula: ##STR1## When compound (5) is reacted with monomer, the catalyst-monomer complex forms by elimination of a volatile component (isobutylene when R.sup.1 is Me and R is H) which is removed by venting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.