Catalysts
US5081091A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 1990 |
| Grant date | Jan 14, 1992 |
| Priority date | — |
| Expiry date | Jun 25, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F4/42
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A catalyst for addition polymerization comprising PA1 (a) an (initiator) first component comprising a plurality of atoms M as hereinafter defined, each in a moiety of formula (I): EQU MX(Y.sub.n)Z.sub.p (I) PA1 wherein PA1 M is Si, Ge or Sn PA1 n is 0 or an integer, and p is an integer such that (n+p)=3; PA1 X is a diradical ##STR1## bound via Q to M where PA1 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, PA1 R.sup.1 is optionally substituted hydrocarbyl, or, when Q is P, M(Y.sub.n)Z.sub.p as herein defined, PA1 R.sup.2 is optionally substituted hydrocarbadiyl, or PA1 R.sup.1 and R.sup.2 together are hydrocarbatriyl, PA1 all such R.sup.1 and R.sup.2 being inert in the conditions of the process of the present invention; and PA1 R.sup.2 being linked directly or indirectly to any group as defined for X, or an organic radical comprising further moieties of formula (I), or one or more M(Y.sub.n)Zp moieties as herein defined; and PA1 Y and Z are independently any group A or OA where A is optionally substituted hydrocarbyl inert in the conditions of the process of the present invention, or Y is optionally substituted trialkylsilylalkyl; and…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.