Hologram forming sheet and process for producing the same

Details Hologram forming sheet and process for producing the same Hologram forming sheet and process for producing the same

1990-08-03

1993-04-06

Ryan, Patrick J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428916, 428915, 4285375, 428200, 264 25, 264 17, B32B 900

Patent

active

052002535

ABSTRACT:
A thin film of molten polypropylene resin extruded from a T die is pressed and cooled with a chill roll equipped with a hologram relief master plate on its peripheral surface, whereupon a hologram pattern is simultaneously formed as an integral part of the polypropylene resin sheet being molded. Since the polypropylene resin has a Rockwell hardness of at least 70, the hologram pattern formed in the resulting hologram forming sheet is less likely to be damaged or lost during subsequent processing.

REFERENCES:
patent: 4452842 (1984-06-01), Borges et al.
patent: 4684795 (1987-08-01), Colgate et al.
patent: 4728377 (1988-06-01), Gallagher
patent: 4856857 (1989-08-01), Takeuchi et al.
patent: 4971646 (1990-11-01), Schell et al.

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