Robert A Brunner

US Patent:

40355713, Jul 12, 1977

Filed:

Sep 24, 1975

Appl. No.:

5/616453

Inventors:

Robert H. Brunner - Yonkers NY
Paul Kraft - Spring Valley NY

Assignee:

Stauffer Chemical Company - Westport CT

International Classification:

C08F22012
C08F22068
C08F23002

US Classification:

526275

Abstract:

Fire retardant copolymers of: (1) a bis (hydrocarbyl) vinylphosphonate, (2) a monomer which contains one ethylenically unsaturated bond, and (3) acrylic or methacrylic acid are disclosed. These copolymers are useful in a variety of applications, including as coatings, and as additives for enhancing the fire retardancy of thermoplastics.

US Patent:

39911357, Nov 9, 1976

Filed:

Jun 4, 1975

Appl. No.:

5/583811

Inventors:

Paul Kraft - Spring Valley NY
Adam F. Kopacki - Westwood NY
Robert Brunner - Yonkers NY

Assignee:

Stauffer Chemical Company - Westport CT

International Classification:

C08L 2722
C08L 3102
C08L 5106
C08L 6300

US Classification:

260876R

Abstract:

A process is disclosed for preparing a polyacrylate-modified polyvinyl chloride processing aid for polyvinyl chloride by sequentially polymerizing the vinyl chloride and the desired acrylate ester monomer. Thus, a conventional vinyl chloride suspension polymerization is conducted at a controlled rate of agitation and in the presence of a specified concentration of suspending agent and is then halted at or near its completion; unreacted vinyl chloride monomer is removed, a minor proportion of an acrylate ester monomer, e. g. , methyl methacrylate, which has been pre-mixed with a fresh supply of a free radical initiating catalyst is added and polymerization is resumed and continued until the acrylate ester monomer polymerizes in and/or on the particles of the previously polymerized polyvinyl chloride. The polyacrylate-modified PVC thereby recovered is an effective aid for processing conventional PVC, or it can be processed per se since it is suitable for calendering or extruding.