Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – By casting liquids on a solid supporting or shaping surface
Patent
1976-10-07
1979-01-09
Lowe, James B.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
By casting liquids on a solid supporting or shaping surface
264 39, 264237, 425224, 425230, B29D 714, B29D 722
Patent
active
041338618
ABSTRACT:
An improvement in the process for continuously manufacturing a methyl methacrylate polymer plate by polymerizing the monomer in a casting space defined by the confronting surfaces of two endless belts running in face-to-face relationship with each other is provided. The improvement is characterized in that the belts are first passed through a first polymerization zone wherein the belts are contacted by hot water, the belts leaving this zone are freed from water clinging to their surfaces, and the belts are then passed through a second polymerizing zone having a temperature above 100.degree. C and forming the polymer plate which is then cooled at a controlled rate prior to withdrawal from the belts. The plate product has an improved heat distortion temperature.
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Lowe James B.
Mitsubishi Rayon Co. Ltd.
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