Process for producing expandable beads of polymethyl methacrylat

Details Process for producing expandable beads of polymethyl methacrylat Process for producing expandable beads of polymethyl methacrylat

1976-11-19

1978-01-10

Kight, III, John

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C08J 900

Patent

active

040678270

ABSTRACT:
A process for improving the production of polymethyl methacrylate beads or copolymeric methyl methacrylate and vinyl beads wherein the monomer is polymerized in the presence of a foaming agent and foaming agent stabilizer and within an atmosphere of inert gas, such as nitrogen, at a pressure of at least 4 kg/cm.sup.2.G. The polymerizatin is pressurized after the reaction has proceeded to a conversion ratio of from 30 to 70%. The process essentially eliminates aggregation and "sticking together" of the beads produced thereby.

REFERENCES:
patent: 3615972 (1971-04-01), Morehouse et al.
patent: 3736273 (1973-05-01), Hatano et al.

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