Imperial Chemical Industries Limited

Anthony Pickering

Peter J Runciman

Denis G Ballard

Nicholas J Walton

Andrew J Thorne

Rowena J Sellens

Dennis G Ballard

An extrusion polymerization process is described in which the polymerization of vinylic monomers, in particular acrylic monomers, is carried out in bulk in an extruder. The polymerization reaction is catalysed by a catalyst composition comprising an initiator, e.g. a ureido substituted silane, and a co-catalyst which is a salt providing a source of anions, e.g. fluoride ions.

Process for extrusion polymerization of acrylic monomers

A catalyst for addition polymerization comprising

Catalysts

A catalyst for addition polymerization comprising:

A catalyst for addition polymerisation comprising

A polymerization process which comprises contacting at least one polar acrylic type or maleimide monomer under polymerization conditions with (i) a tetracoordinate organosilicon, organotin or organogermanium initiator having at leasst one initiating site and (ii) a co-catalyst which is a complex obtained by the interaction of a source of fluoride, bifluoride, cyanide or azide ions or a Lewis acid with a complexing agent.

Rate-moderated group transfer polymerization

A polymerization process which comprises contacting at least one polar acrylic type or maleimide monomer under polymerization conditions with (i) a tetracoordinate organosilicon, organotin or organogermanium initiator having at least one initiating site, (ii) a co-catalyst which is a source of fluoride, bifluoride, cyanide or azide ions or a Lewis acid, and (iii) from 0.1 to 10% by weight, based on the weight of monomer, of acetonitrile.

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Kingsley, United Kingdom

Anthony Pickering