Polymer composition containing processing aid

Details Polymer composition containing processing aid Polymer composition containing processing aid

1975-06-04

1976-11-09

Tillman, Murray

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260 174R, 260 23EP, 260 23XA, 260 2850, 260 457P, 260 4575T, 260 4575R, 260 4575K, 260 458NZ, 260 4585R, 260836, 260878R, 260884, 260885, C08L 2722, C08L 3102, C08L 5106, C08L 6300

Patent

active

039911357

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.

REFERENCES:
patent: 3504053 (1970-03-01), Williams
patent: 3764638 (1973-10-01), Hwa et al.

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