Method of forming finished edge of plural-layer optical membrane

Details Method of forming finished edge of plural-layer optical membrane Method of forming finished edge of plural-layer optical membrane

1992-01-09

1993-12-21

Dang, Thi

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

156652, 156655, 156668, B29D 1100

Patent

active

052718034

ABSTRACT:
A method of forming a finished edge on a plural-layer optical membrane is disclosed. The method involves dissolving a desired portion of an outer layer with a solvent that dissolves the outer layer but has no substantial effect on a first next layer, and repeating the dissolving for a corresponding portion of such first next layer with a solvent that dissolves the first next layer but has no substantial effect on the outer layer. The plural-layer membrane may include five layers with a pair of opposing outer layers of a fluoropolymer-based polymer, a pair of intermediate layers of polymers chosen from the group consisting of polyvinylnaphthalene, polymethylstyrene, or polystyrene, and a core layer of a nitrocellulose-based polymer. The solvents for dissolving each layer are freon for the outer layers, toluene or xylene for the intermediate layers, and acetone for the core layer.

REFERENCES:
patent: 3186883 (1962-11-01), Frantzen
patent: 3614822 (1971-10-01), Brown
patent: 4240869 (1980-12-01), Diepers
patent: 4738746 (1988-04-01), Clarion
patent: 4818336 (1989-04-01), Rosetti
patent: 4944838 (1990-07-01), Koch et al.

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