Process for preparation of light-diffusing methacrylic resin pla

Details Process for preparation of light-diffusing methacrylic resin pla Process for preparation of light-diffusing methacrylic resin pla

1987-05-12

1989-06-13

Lowe, James

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 16, 264 73, B29C 3916, B29D 1100

Patent

active

048391255

ABSTRACT:
Light-diffusing methacrylic plates are continuously prepared by casting a polymerizable material composed of methyl methacrylate or a partially polymerized product thereof with 0.2 to 3.0% by weight of a light diffusing material between two belts. The belts are separated by an average distance l but are capable of both compression and expansion relative to this average separation. The method involves applying compression at at least one point in the casting space to reduce the separation distance and then allowing expansion back to a maximum distance wherein the maximum spacing between the belts is from (l+1) mm to (l+0.2) mm and the minimum spacing during compression is from (l-1) mm to (l-0.2) mm.

REFERENCES:
patent: 3410934 (1968-11-01), Kuritzkes et al.
patent: 3422178 (1969-01-01), Junker et al.
patent: 3600490 (1971-08-01), Billingsley et al.
patent: 4041120 (1977-08-01), Oshima et al.
patent: 4232078 (1980-11-01), Kamada
patent: 4415509 (1983-11-01), Toyooka et al.
Patent Abstracts of Japan, vol. 4, No. 80 (M-15), [562], Jun. 10, 1980, M. Field.

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