The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 18, 1986
Filed:
Oct. 23, 1984
Sumitomo Bakelite Company Limited, Tokyo, JP;
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.