Process for preparing narrow molecular weight distribution syndiotactic polymers or copolymers of unsaturated carboxylic acid esters
US5218064A · kind A · utility
11Cited by
6References
4Claims
0Family size
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Key dates
| Filing date | Apr 29, 1992 |
| Grant date | Jun 8, 1993 |
| Priority date | — |
| Expiry date | Apr 29, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F20/12
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for preparing a narrow molecular weight distribution syndiotactic polymer or copolymer of an unsaturated carboxylic acid ester (e.g., acrylate or methacryrate) by using, as an initiator, at least one organometallic compound of the group consisting of (a) trivalent organic Y compounds, and (b) trivalent organic lanthanide (La, Ce, Pr, Nd, Pm, Sm, Eu, Ga, Tb, Dy, Ho, Er, Tm, Yb, Lu) compounds, or a combination thereof with an organoaluminum compound having the formula: EQU AlR.sub.n X.sub.3-n wherein R is an aliphatic hydrocarbon group, X is a halogen element, and n is an integer of 1 to 3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.