Process for producing substrate for optical recording medium

Details Process for producing substrate for optical recording medium Process for producing substrate for optical recording medium

1984-10-23

1986-02-18

Ozaja, Donald

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Composite or multiple layer

264 25, 264106, 264219, 264261, 264337, 428 64, 428414, 430271, 430273, B29D 1100

Patent

active

045713146

ABSTRACT:
A process for producing a substrate for optical recording medium (optical disk recording medium), which comprises coating at least one inner surface of a casting mold with a radiation-curable or thermosetting resin, curing the resin to form a coating film on the mold surface or surfaces, casting into the mold an epoxy resin composition comprising an alicyclic epoxy resin or a mixture of an alicyclic epoxy resin and an aromatic epoxy resin, an organic polybasic acid anhydride, a curing accelerator and an anti-discoloring (anti-oxidative) agent, curing the epoxy resin composition to transfer the coating film of the mold to the surface of the cured product of the epoxy resin composition, thereby forming a double or triple layer cast laminate. The above casting mold may have a mold-releasing film on the inner surfaces and the coating film may be formed on this mold-releasing film.

REFERENCES:
patent: 3629388 (1971-12-01), Wolfe et al.
patent: 4199421 (1980-04-01), Kamada et al.
patent: 4374077 (1983-02-01), Kerfeld

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