Completely light-shielding packaging material for photosensitive

Details Completely light-shielding packaging material for photosensitive Completely light-shielding packaging material for photosensitive

1996-12-06

1999-11-09

Chen, Vivian

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428 352, 428 357, 428213, 428215, 428323, 428515, 428516, 428523, 428910, 2065241, B32B 702, B32B 2708, B32B 2720, B32B 2732

Patent

active

059810483

ABSTRACT:
A completely light-shielding packaging material for a photosensitive material obtained on laminating two sorts of separately molded light shielding thermoplastic resin films of different properties on the photosensitive material side and on its outer side via an adhesive layer. The outer thermoplastic resin film is a polypropylene-based resin film at least containing a light-shielding material and a homopolypropylene resin or an .alpha.-olefin containing polypropylene-based resin and having a Young's modulus in the longitudinal direction of 150 to 600 kg/mm.sup.2 and a thickness of 15 to 80 .mu.m. The inner thermoplastic resin film is a polyolefin-based resin film at least containing a light-shielding material, an ethylene copolymer resin and a polyolefin resin, and having a Young's modulus in the longitudinal direction of not higher than 120 kg/mm.sup.2 and a thickness of 20 to 150 .mu.m. This material has physical strength, heat-sealing performance, and amenability to bag making. Light-shielding bag for photosensitive material is produced.

REFERENCES:
patent: 4452846 (1984-06-01), Akao
patent: 4579781 (1986-04-01), Akao
patent: 4701359 (1987-10-01), Akao
patent: 4780357 (1988-10-01), Akao
patent: 5075163 (1991-12-01), Akao
patent: 5492741 (1996-02-01), Akao et al.
Schut, Jan H., "Enter A New Generation of Polyolefins." Plastics, pp. 15-17, Nov. 1991.

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