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US 5,667,937 AGranted
Method of solid imaging a photohardenable composition utilizing argon laser at 351 nm and 364 nm
AssigneeE. I. Du Pont de Nemours and Company
InventorsJohn Alan Lawton, Jonathan V. Caspar
Life of this patent
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Abstract
A combination of a photoacid precursor and sensitizer for use with multiple wavelengths of an argon ion laser.
Claims2
A method of solid imaging a photohardenable composition containing (a) an epoxy, (b) a photoacid precursor which is a triarylsulfonium salt and (c) a sensitizer selected from the group consisting of 1,12 benzoperylene, 1,6 diphenyl hexatriene and 1,8 diphenyl octratetraene by exposing said composition to an argon laser at wavelengths of both 351 nm and 364 nm
- with the proviso that
- (i) when the sensitizer is 1,12 benzoperylene its weight ratio to the salt is not greater than 0.041,
- (ii) when the sensitizer is 1,6 diphenyl hexatriene its weight ratio to the salt is not greater than 0.005, and
- (iii) when the sensitizer is 1,8 diphenyl octratetraene its weight ratio to the salt is not greater than 0.009.
1 more element
Dependencies are inferred from the claim text.