Catalysts
US4981827A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 27, 1988 |
| Grant date | Jan 1, 1991 |
| Priority date | — |
| Expiry date | Dec 27, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F4/42
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A catalyst for addition polymerisation comprising PA0 (a) an (initiator) first component of formula (I): EQU M(X.sub.m)(Y.sub.n)Zp (I) PA0 wherein PA0 M is Si, Ge or Sn PA0 m and p are each an integer and n is 0 or an integer such that (m+n+p)=4; PA0 X is QR.sup.1 R2.sup.2 where Q is N, P, As or P(=T)G.D where T is O or S and G and D are each independently a bond, O or S and R.sup.1 and R.sup.2 are each independently optionally substituted hydrocarbyl or together are optionally substituted hydrocarbadiyl which are inert in the process conditions of the present invention, or, when Q is P(=T)G.D as hereinbefore defined, R.sup.1 and R.sup.2 are each independently M(Y.sub.n)Z.sub.p as hereinbefore defined. PA0 Y is independently any group as defined for X, or any group selected from a group OA where A is optionally substituted hydrocarbyl inert in the process conditions of the present invention, or trialkylsilylalkyl; PA0 Z is independently any group as defined for Y, or an organic polymer radical comprising further M(Y.sub.n)Z.sub.p moieties; or PA0 p is 2 and Z.sub.2 is a group Z.sup.1.sub.8 of the formula - OSiR.sup.5 R.sup.6 OSiR.sup.7 R.sup.8 O-where R.sup.5, R.sup.6, R.sup.7 and …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.