Patent ID: 6713584
Filing Date: 2004-03-30
Classification: C08F

Abstract:
A method of preparing a polymer which includes at least one polymerisable double bond which comprises:(i) mixing together a monofunctional monomer having one polymerisable double bond per molecule with 0.3-100% w/w (of the weight of the monofunctional monomer) of a polyfunctional monomer having ea least two polymerisable double bonds per molecule and from 0.0001-50% w/w (of the weight of the monofunctional monomer) of a chain transfer agent and optionally a free-radical polymerisation initiator, said monofunctional monomer comprising at least one of methyl (meth)acrylate, n-butyl (meth)acrylate, iso-butyl (meth)acrylate, t-butyl (meth)acrylate or methacrylic acid and said polyfunctional monomer comprising at least one of bi-functional (meth)acrylates, tri-functional (meth)acrylates, tetra-functional (meth)acrylates, penta-functional (meth)acrylates, hexa-functional (meth)acrylates, oligomers or polymers having at least two polymerisable (meth)acrylate groups per molecule, and mixtures thereof (ii) reacting said mixture to form a polymer, and (iii) terminating the polymerisation reaction when 80 to 98% of the polymerisable double bonds present in the mixture have reacted to form polymer.