Claims
- 1. A method of manufacturing a die particularly adapted for the manufacture of a plastics information carrier containing an information track readable by an optical beam or similar reading means by:
- (a) directly applying to a metal surface of a rigid, substantially flat die, which surface contains the negative of the desired information track, a thin layer of a thickness of 0.2-300 microns of a light-curable polymerizable liquid having a viscosity of from 1 to 100 cP and comprising low molecular weight acrylic monomers or a mixture of low molecular weight acrylic monomers and acrylic oligomers, which liquid contains 25-70% by weight of unsaturated hydrocarbon and/or phenyl groups, has an average functionality in regard to unsaturatedness of between 2.1 and 6, is at least substantially aprotic and consists for at least 95% of monomers having a maximum average molecular weight of about 400;
- (b) applying to the exposed surface of said thin layer of polymerizable liquid a thin light-pervious plastic substrate;
- (c) exposing said thin layer of polymerizable liquid to light radiation through said substrate for a time sufficient to cause said thin layer of polymerizable liquid to cure to a solid state adhering to said substrate thereby producing a laminate of said substrate and said cured layer containing the desired optically readable information readily removable from said die without effect on said laminate or said die; and
- (d) removing said laminate from said die,
- said method comprising providing on one major surface of a flat glass plate said information track, electrolessly depositing on said surface of said flat glass plate containing said information track a first metal layer by electroless deposition and then, depositing, by electrodeposition, a second metal layer on said first metal layer, causing a flat stiffening plate to adhere to the surface of said second metal layer remote from said first metal layer and removing said glass plate from the first metal layer thereby forming a flat father disc having a free metal surface containing the negative of said information track and suitable for use as a die.
- 2. The method of claim 1 wherein the overall thickness of the two metal layers is not more than 150 .mu.m.
- 3. A substantially flat die obtained by the method of claim 1, the macroscopic flatness of which differs at a maximum 10 microns from the theoretical flat surface of the die.
Priority Claims (1)
Number |
Date |
Country |
Kind |
7611395 |
Oct 1976 |
NLX |
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Parent Case Info
This is a division of application Ser. No. 95,130 filed Nov. 16, 1979, now U.S. Pat. No. 4,275,091 which is in turn a continuation of application Ser. No. 887,188 filed Mar. 16, 1978 now abandoned which application is in turn a division of application Ser. No. 774,973, filed Mar. 7, 1977, and now abandoned.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
4188433 |
Dijkstra et al. |
Feb 1980 |
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4272574 |
Lippits et al. |
Jun 1981 |
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4298975 |
van der Veen et al. |
Nov 1981 |
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4363844 |
Lewis et al. |
Dec 1982 |
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Divisions (2)
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Number |
Date |
Country |
Parent |
95130 |
Nov 1979 |
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Parent |
774973 |
Mar 1977 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
887188 |
Mar 1978 |
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