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US 4,902,772 AGranted
Dispersion polymerisation process
AssigneeImperial Chemical Industries PLC
InventorsNeil Carter, Brian P. Griffin, William A. MacDonald, Timothy G. Ryan
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AssigneeImperial Chemical Industries PLC
InventorsNeil Carter, Brian P. Griffin, William A. MacDonald, Timothy G. Ryan
Estimating the term…
A process of polymerizing a polymerizable material in an inert organic liquid medium, in which the polymer formed from the monomer or monomers is insoluble, comprising dispersing the polymerizable material in the organic liquid in the presence of a finely, divided particulate material comprising an inorganic portion insoluble in the organic liquid medium and in combination therewith, preferably by covalent or ionic bonding, hydrocarbon chains containing at least 8 carbon atoms, the hydrocarbon chains being soluble in the organic liquid medium and heating the mixture to polymerize the polymerizable material to a required degree of polymerization. The process provides a means of stabilizing dispersion polymerizations which need to be carried out at very high temperatures to effect the polymerization.
A process for the production of a condensation polymer dispersed in an inert organic liquid medium, comprising mixing reactants for forming the condensation polymer in the organic liquid in the presence of a finely divided particulate material having at least 95% by weight of particles with at least one dimension less than 1 micron and comprising an inorganic portion insoluble in the organic liquid medium, and in combination therewith hydrcarbon chains containing at least 8 carbon atoms, the hydrocarbon chains being at least partially soluble in the organic liquid medium, and heating the mixture to produce a condensation polymer of a required degree of polymerisation in the form of stably deflocculated, polymer particles.
Dependencies are inferred from the claim text.