Plural mold process for producing non-uniform pellicles

Details Plural mold process for producing non-uniform pellicles Plural mold process for producing non-uniform pellicles

1975-11-12

1980-01-29

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Gas or vapor deposition of article forming material onto...

264101, 264310, 528396, B29D 700

Patent

active

041861647

ABSTRACT:
Pellicles of p-xylylene polymer of non-uniform thickness are prepared between a plurality of mold plates having planar or contoured mold surfaces by positioning the mold surfaces apart with respect to each other so as to form a passage therebetween, and, while providing a pattern of non-uniform pressure between, and/or temperature on, the mold surfaces, directing a stream of vapors of p-xylylene monomer through such passage so as to cause the monomer to condense and polymerize on the mold surfaces in a non-uniform manner in response to such pattern of pressure and/or temperature.
The mold plates are held stationary, and/or are rotated, in the vapor condensation zone, during the pellicle forming operation.

REFERENCES:
patent: 3068510 (1962-12-01), Coleman
patent: 3120450 (1964-02-01), Diefendorf et al.
patent: 3301707 (1967-01-01), Loeb et al.
patent: 3379803 (1968-04-01), Tittmann et al.
patent: 3472795 (1969-10-01), Tittmann et al.
patent: 3627569 (1971-12-01), Beecham
patent: 3658954 (1972-04-01), Broadbent

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