Method including producing a stencil from layer of dichromate-se

Details Method including producing a stencil from layer of dichromate-se Method including producing a stencil from layer of dichromate-se

1984-12-21

1985-12-31

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

156644, 1566591, 1566611, 156904, 430 28, 430270, 430325, C23F 102, B44C 122, C03C 1500, C03C 2506

Patent

active

045619310

ABSTRACT:
A method for producing a stencil of PVA (polyvinyl alcohol) including applying and heat-drying to a surface a coating of an aqueous composition of PVA and dichromate sensitizer, and then exposing and developing the dried coating. The aqueous composition includes a fluorescein-type dye or combination of dyes in such proportions as to substantially reduce heat-hardening of the dried coating. The method is particularly useful for preparing etch-resistant stencils used in preparing precision-etched products, such as apertured masks for use in cathode-ray tubes.

REFERENCES:
patent: 3074794 (1963-01-01), Oster
patent: 4255504 (1981-03-01), Hakala
patent: 4339528 (1982-07-01), Goldman
patent: 4339529 (1982-07-01), Goldman
patent: 4401508 (1983-08-01), Ritt

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