Coating processes – Electrical product produced – Welding electrode
Patent
1979-11-16
1981-06-23
Newsome, John H.
Coating processes
Electrical product produced
Welding electrode
427 541, 427355, 156245, 156246, 156272, B05D 306
Patent
active
042750911
ABSTRACT:
The invention relates to a method of reproducing plastics record carriers, in particular duplicating video records. According to the invention, a metal die is used which is provided with a thin-liquid molding resin of a particular composition which can be polymerized by radiation. A radiation-pervious substrate which is manufactured from synthetic material, for example polymethylmethacrylate, is provided on the molding resin. The molding resin is exposed to light via the substrate after which the cured molding resin together with the substrate connected thereto is removed from the die. The molding 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 molding resin is aprotic and has a functionality as regards unsaturatedness which is between the values 2 and 6. A suitable molding resin contains mono-, tri- or tetra esters of acylic acid. The molding 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 master 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 herefrom which are provided in a simpler manner with a flat stiffening plate. The invention also extends to the molding resin, substrate and die used in the method, as well as to the resulting plastics record carriers.
REFERENCES:
patent: 2361082 (1944-10-01), Brown
patent: 3607380 (1971-09-01), Thams
patent: 3684348 (1972-08-01), Rowland
patent: 3935359 (1976-01-01), Rowland
patent: 4042654 (1977-08-01), Leszyk et al.
patent: 4113894 (1978-09-01), Koch
Kramer et al., "Eduology", vol. 4, No. 1, 1973.
De Jonge Jelis
Dijkstra Rinse
Lippits Gerardus J. M.
Op Het Veld Adriaan J. G.
Van Den Broek Arnoldus J. M.
Newsome John H.
Spain Norman N.
U.S. Philips Corporation
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