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AssigneeHooker Chemicals & Plastics Corporation
InventorAkio Takahashi
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An improved vinyl halide or vinyl halide copolymer containing up to 50 percent of a copolymer can be obtained by polymerizing in contact with an aliphatic hydrocarbon olefin homopolymer, copolymer or terpolymer in a process of bulk polymerizing comprising single stage or two-stage bulk polymerization wherein high speed agitation is used during the first stage and low speed agitation is used in the second stage. By polymerizing in the presence of the olefin polymer or copolymer, reduced particle size, reduced lump formation, and lower melt viscosity and improved impact strength can be obtained in the resin product. Small amounts of the olefin polymer or copolymer are effective in providing particle size control, reducing lump formation and eliminating scale build-up. Larger amounts of olefin polymer increase impact strength, reduce melt viscosity and provide excellent mold release properties in the final product.
In a process for the preparation of a vinyl chloride polymer comprising polymerizing in bulk in liquid phase in the presence of a trunk polymer and a free radical initiator compound for said polymerization, a vinyl halide monomer either alone or in combination with up to 50% by weight based on the total weight of monomer, of another ethylenically unsaturated monomer copolymerizable therewith, the improvement which comprises carrying out the polymerization in the presence of about 0.05% to about 20% by weight, based upon said vinyl halide monomer, of a trunk polymer consisting essentially of an olefin trunk polymer of at least two aliphatic hydrocarbon olefin monomers of 2 to 8 carbon atoms and no more than 15% by weight, based on the weight of said olefin polymer of an aliphatic hydrocarbon non-conjugated polyene of 4 to 18 carbon atoms, said olefin polymer being soluble, partially soluble, or dispersible in said monomer or monomers, and said olefin polymer having a weight average molecular weight of about 50,000 to about 1,000,000.
In the process for preparation of a vinyl chloride polymer comprising polymerizing in bulk in liquid phase in two stages in the presence of a trunk polymer and a free radical initiator compound for the polymerization, a vinyl chloride monomer, either alone or in combination with up to 50% by weight based on the total weight of monomer of another ethylenically unsaturated monomer copolymerizable therewith, the improvement of carrying out said polymerization in the presence of about 0.05% to about 20% by weight, based upon said vinyl chloride monomer, of a trunk polymer consisting essentially of an ethylene-propylene diene-modified terpolymer which is soluble, partially soluble or dispersible in said monomer or monomers, which has a weight average molecular weight of about 50,000 to 1,000,000, and wherein the diene is a non-conjugated diene present in an amount no more than 15% by weight, based on the weight of said terpolymer.
In the polymer product of a composition comprising a vinyl chloride monomer, either alone or in combination with up to 50% by weight based on the total weight of monomer, of another ethylenically unsaturated monomer copolymerizable therewith, and a trunk polymer, polymerized in bulk in liquid phase in the presence of a free radical initiator compound for the polymerization reaction, the improvement wherein said trunk polymer consists essentially of an olefin trunk polymer of at least two aliphatic hydrocarbon olefin monomers of 2 to 8 carbon atoms and no more than 15% by weight, based on the weight of said olefin polymer, of an aliphatic hydrocarbon non-conjugated polyene of 4 to 18 carbon atoms, said olefin polymer having a weight average molecular weight of about 50,000 to 1,000,000, the proportion of olefin polymer in said product being about 0.05% to about 20% by weight based on vinyl halide monomer units thereof.
In the polymer product of a composition comprising a vinyl chloride monomer and a trunk polymer, polymerized in bulk liquid phase in the presence of a free radical initiator compound for the polymerization reaction, the improvement wherein said trunk polymer consists essentially of an olefin trunk polymer of at least two aliphatic hydrocarbon olefin monomers of 2 to 8 carbon atoms and no more than 15% by weight, based on the weight of said olefin polymer of an aliphatic hydrocarbon non-conjugated polyene of 4 to 18 carbon atoms, said olefin polymer having a weight average molecular weight of about 50,000 to 1,000,000 and being present as a rubber and graft polymer disperse phase having a particle diameter of about 0.1 to about 0.5 microns, the proportion of olefin polymer in said product being about 1% to about 20% by weight based on vinyl halide monomer units thereof to impart high impact strength to said product.
Dependencies are inferred from the claim text.