METHOD OF OBTAINING SMALL PARTICLE SIZE POLYMERS AND COPOLYMERS OF VINYL CHLORIDE BY BULK POLYMERIZATION

• US 3,810,958 A
• Filed: 05/08/1972
• Issued: 05/14/1974
• Est. Priority Date: 05/08/1972
• Status: Expired due to Term

• Current Assignee: Occidental Chemical Corporation (Occidental Petroleum Corporation)
• Original Assignee: Lemper A, Takahashi A
• Inventors: TAKAHASHI A, LEMPER A
• Application Number:
  US05/251,098
• Time in Patent Office: 736 Days
• US Class Current: 526/201
• CPC Class Codes: C08F 214/00 Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
• CPC Class Codes: C08F 255/00 Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00

Abstract

IN A PROCESS OF BULK POLYMERIZATION INVOLVING TWO-STAGE POLYMERIZATION WHEREIN HIGH SPEED AGITATION IS USED DURING THE FIRST STAGE AND SLOW SPEED AGITATION IS USED IN THE SECOND STAGE, THE POLYMERIZATION IN THE FIRST STAGE IS CONDUCTED IN CONTACT WITH A SYRENE-BUTADIENE RUBBER POLYMER. BY THE BOVEL POLYMERIZATION METHODS, SMALL PARTICLE SIZE POLYVINYL CHLORIDE HOMOPOLYMERS OR COPOLYMERS ARE PRODUCED WHICH ARE USEFUL AS EXTENDER RESINS IN LASTISOLS.

Claims