Process for polymerizing methacrylic acid ester monomers
US5180799A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1990 |
| Grant date | Jan 19, 1993 |
| Priority date | — |
| Expiry date | Dec 21, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F4/50
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for addition polymerization of vinylic (in particular methacrylic) monomers at a temperature in the range of -20.degree. to 60.degree. c., in the presence of a catalyst comprising: PA0 (a) a first component of empirical formula (I): EQU MT (I) PA0 wherein PA1 M is an alkali metal atom; and PA1 T is bulky hydrocarbyl which contains at least 4 carbon atoms and is optionally substituted by one or more pendent substituents, or hetero-substituted hydrocarbyl, each of which is inert in the process conditions; and PA0 (b) a (co-catalyst) second component comprising a compound of empirical formula (II): EQU Q(X.sub.m) (Y.sub.n) Zp (II) PA0 wherein PA1 Q is Al, B or Zn; PA1 m, n and p are each 0 or an integer such that (m+n+p)=2 or 3 (depending on the appropriate valency of Q; and PA1 X, Y and Z are each independently optionally substituted bulky hydrocarbyl, or PA1 X and Y together are optionally substituted hydrocarbadiyl, and Z is optionally substituted bulky hydrocarbyl, PA0 all of which groups are inert in the process conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.