Low temperature process for the preparation of graft copolymer dispersions
AssigneeBASF Wyandotte Corporation
InventorsGerhard G. Ramlow, Louis C. Pizzini, John T. Patton, Jr.
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Abstract
Graft copolymer dispersions of improved viscosity and superior particle size distribution are prepared by the in situ polymerization of vinyl monomers in unsaturation-containing polyols in the presence of a free-radical catalyst and certain chain transferring agents at temperatures below 100.degree. C. The dispersions are low viscous liquids which may be advantageously employed in the preparation of polyurethanes.
Claims8
In a process for the preparation of graft copolymer dispersions which comprises the in situ polymerization of from 1% to 30% by weight based on the weight of polyol mixture of a vinyl monomer or mixture of said monomers in a co-reactive unsaturation-containing polyol mixture containing from 0.1 mole to 3.0 moles of unsaturation per mole of polyol mixture in the presence of from 0.05% to 5% by weight based on the weight of said vinyl monomer of a free radical catalyst, the improvement which comprises carrying out the polymerization at a temperature below 100.degree.C. and in the presence of from 0.1% to 2% by weight based on the weight of vinyl monomer of an alkyl mercaptan chain transferring agent.
Dependencies are inferred from the claim text.