Optical disc base plate and process for producing the same

Details Optical disc base plate and process for producing the same Optical disc base plate and process for producing the same

1986-07-22

1989-03-14

Bleutge, John C.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

522 96, 522181, 526301, 264 14, 264 22, C08F 250, C08F 2058, C08F 2020, B32B 302

Patent

active

048123463

ABSTRACT:
The invention discloses an optical disc base plate obtained by curing with irradiation of light a light- or radiation-curable resin composition in which a photopolymerization initiator is contained in an amount of 0.5 to 5 parts by weight per 100 parts by weight of a resin composition comprising the compounds (1), (2) and (3) mixed in amounts falling in the area defined by lines A-B-C-D-E-A in the triangular diagram of FIG. 1, and a process for producing an optical disc base plate which comprises arranging a stamper carrying an information pattern thereon and a light-transmittable flat plate in opposition to each other so as to form a space therebetween, dividing said space into a main space and a resin reservoiring space by a notching ring provided to the light-transmittable plate so as to form a small clearance at a part of the space, casting a light-curable resin into the entirety of the main space and a part of the resin reservoiring space from an inlet, and curing the resin by irradiation of energy from an external energy source.

REFERENCES:
patent: 3899611 (1975-08-01), Hall
patent: 3989609 (1976-11-01), Brack
patent: 4214965 (1980-07-01), Rowe
patent: 4218294 (1980-10-01), Brack
patent: 4329421 (1982-05-01), Wisnosky
patent: 4348456 (1982-09-01), Imanaka
patent: 4456659 (1984-06-01), Sudo
patent: 4544625 (1985-10-01), Ishimaru
patent: 4650845 (1987-03-01), Hegel

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