C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/122, 402/182
C08F 20/20 (2006.01) G03F 7/00 (2006.01) G11B 3/70 (2006.01) G11B 23/00 (2006.01)
Patent
CA 1111194
ABSTRACT: The invention relates to a method of repro- ducing plastics record carriers, in particular dupli- cating video records. According to the invention, a metal die is used which is provided with a thin-liquid moulding resin of a particular composition which can be polymerized by radiation. A radiation-pervious substrate which is manufactured from synthetic ma- terial, for example polymethylmethacrylate, is pro- vided on the moulding resin. The moulding resin is exposed to light via the substrate after which the cured moulding resin together with the substrate con- nected thereto is removed from the die. The moulding resin used in the process comprises low-molecular monomers or oligomers which contain on an average 25-70% by weight of hydrocarbon groups and/or phenyl groups. The moulding resin is aprotic and has a functionality as regards unsaturatedness which is between the values 2 and 6. A suitable moulding resin contains mono-, tri- or tetra esters of acylic acid. The moulding resin preferably has a swelling capacity with respect to the substrate and for that purpose preferably comprises a vinylmonomer. The metal die used in the method preferably is a quite flat die which is obtained by providing the mastor disk which is a flat glass plate with information track with a nickel layer, gluing hereon a flat stiffening plate and then removing the master disk. The resulting father disk may be used as a die. Alternatively, further metal copies may be made here from which are provided in a simpler manner with a flat stiffening plate. The invention also extends to the moulding resin, substrate and die used in the method, as well as to the resulting plastics record carriers.
288224
de Jonge Jelis
Dijkstra Rinse
Lippits Gerardus J.m.
Op Het Veld Adriaan J.g.
Van Den Broek Arnoldus J.m.
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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