Gilbert M Witschard, Age 63306 Summit Ave, Buffalo, NY 14214

4137216, Jan 30, 1979

Jun 29, 1977

5/811215

Anthony L. Lemper - Tonawanda NY
Gilbert Witschard - Grand Island NY
Victor A. Pattison - Clarence Center NY

Hooker Chemicals & Plastics Corp. - Niagara Falls NY

C08K 906
C08K 900
C08F25500
C08F25506

260 4214

An improved polyvinyl halide or a vinyl halide copolymer containing up to 50 percent of a comonomer can be obtained by post polymerizing in a single stage or two-stage bulk process in contact with a base polymer, the same or different monomer as the monomer used to form the base polymer. Compositions produced by the process of the invention are useful in making films, coated fabrics and molded objects. The liquid phase post polymerization process of the invention is applicable to base polymers in powder form prepared by emulsion, suspension and bulk polymerization processes. The base polymer can be present in a polymerization mixture in which only a partial amount of monomer has been converted to base polymer such as in a two-stage polymerization process or the base polymer can be used in dry, solid form. Polymers of the invention have improved bulk density and reduced plasticizer uptake and can be used to prepare fabric coatings. Copolymers prepared by the novel post-polymerization process of the invention which show increased impact strength in addition to improved bulk density and reduced plasticizer uptake are useful in the preparation of molding compounds.

3970612, Jul 20, 1976

Dec 30, 1974

5/537518

Gilbert Witschard - Grand Island NY

Hooker Chemicals & Plastics Corporation - Niagara Falls NY

C08F 202
C08F 240
C08F 1406
C08F25904

526 86

Vinyl halide homopolymers, copolymers and graft polymers of substantially lower molecular weight are obtained when polymerization is carried out in the presence of an organotin mercaptide ester and an organic azo initiator. The products are faster fusing and have lower melt viscosities than corresponding polymers of the same molecular weight prepared by high temperature molecular weight reduction methods. The low molecular weight and excellent fusion characteristics of the products render these polymers particularly useful in molding, extrusion, and coating applications.

4423188, Dec 27, 1983

Mar 8, 1982

6/355425

Gilbert Witschard - Grand Island NY

Occidental Chemical Corporation - Niagara Falls NY

C08L 5100
C08L 5300

525 71

A polymer blend capable of being molded to an impact resistant, substantially transparent or translucent article which comprises a vinyl halide homopolymer or copolymer, a conventional impact resistance enhancing polymer agent for polyvinyl halide wherein the monomer units consist essentially of methyl methacrylate, 1,3-butadiene and styrene residues and a thermoplastic block elastomer wherein the essential and predominant monomer units are the residue of a mono-alkenyl aromatic hydrocarbon and the residue of an alkadiene hydrocarbon. The thermoplastic elastomer is normally incompatible with the vinyl halide polymer or copolymer. The vinyl halide polymer or copolymer constitutes the major proportion of said blend and the block and methacrylate polymers together constitute a minor proportion of the composition. The weight ratio of block polymer to methacrylate polymer is about 1:5 to about 5:1.

4192828, Mar 11, 1980

Mar 31, 1978

5/892226

Gilbert Witschard - Grand Island NY

Hooker Chemicals & Plastics Corp. - Niagara Falls NY

C08L 5302
C08L 5708

525 83

Mixtures of vinyl halide-graft-polyolefin polymer compositions with a minor proportion of a monoalkenyl arene-hydrocarbon alkadiene block thermoplastic elastomer which are capable of being molded to impact-resistant articles exhibit enhancement of low temperature impact resistance on ageing.

4413092, Nov 1, 1983

Feb 24, 1982

6/351792

Gilbert Witschard - Grand Island NY

Occidental Chemical Corporation - Niagara Falls NY

C08L 2706
C08L 5302
C08L 5502

525 71

A polymer blend capable of being molded to an impact resistant, article which comprises a vinyl halide homopolymer or copolymer, a conventional impact resistant enhancing polymer agent for polyvinyl halide wherein the monomer units consist essentially of acrylonitrile, 1,3-butadiene and styrene residues and a thermoplastic block elastomer wherein the essential and predominant monomer units are the residue of a mono-alkenyl aromatic hydrocarbon and the residue of an alkadiene hydrocarbon. The thermoplastic elastomer is normally incompatible with the vinyl halide polymer or copolymer. The vinyl halide polymer or copolymer constitutes the major proportion of said blend and the block and methacrylate polymers together constitute a minor proportion of the composition. The weight ratio of block polymer to acrylonitrile-butadiene-styrene polymer is preferably about 1:5 to about 5:1. Preferably an acrylonitrile-butadiene-styrene polymer having about the same refractive index as that of the vinyl halide resin is employed to obtain a substantially transparent or transluscent molded article.

4319002, Mar 9, 1982

Jul 28, 1980

6/172929

Gilbert Witschard - Grand Island NY

Hooker Chemicals & Plastics Corp. - Niagara Falls NY

C08L 5100
C08L 5300

525 71

A polymer blend capable of being molded to an impact resistant, substantially transparent or translucent article which comprises a vinyl halide homopolymer or copolymer, a conventional impact resistance enhancing polymer agent for polyvinyl halide wherein the monomer units consist essentially of methyl methacrylate, 1,3-butadiene and styrene residues and a thermoplastic block elastomer wherein the essential and predominant monomer units are the residue of a mono-alkenyl aromatic hydrocarbon and the residue of an alkadiene hydrocarbon. The thermoplastic elastomer is normally incompatible with the vinyl halide polymer or copolymer. The vinyl halide polymer or copolymer constitutes the major proportion of said blend and the block and methacrylate polymers together constitute a minor proportion of the composition. The weight ratio of block polymer to methacrylate polymer is about 1:5 to about 5:1.

4155899, May 22, 1979

Aug 4, 1976

5/711672

Anthony L. Lemper - Tonawanda NY
Gilbert Witschard - Grand Island NY
Victor A. Pattison - Clarence Center NY

Hooker Chemicals & Plastics Corp. - Niagara Falls NY

C08F25500
C08F 202
C08F 1400

260 4253

An improved polyvinyl halide or a polyvinyl halide copolymer containing up to 50 percent of a comonomer can be obtained by post polymerizing in a single stage or two-stage bulk process in contact with a base polymer, the same or different monomer as the monomer used to form the base polymer. Compositions produced by the process of the invention are useful in making films, coated fabrics and molded objects. The liquid phase post polymerization process of the invention is applicable to base polymers in powder form prepared by emulsion, suspension and bulk polymerization processes. The base polymer can be present in a polymerization mixture in which only a partial amount of monomer has been converted to base polymer such as in a two-stage polymerization process or the base polymer can be used in dry, solid form. Polymers of the invention have improved bulk density and reduced plasticizer uptake and can be used to prepare fabric coatings. Copolymers prepared by the novel post-polymerization process of the invention which show increased impact strength in addition to improved bulk density and reduced plasticizer uptake are useful in the preparation of molding compounds.