Method of applying a transparent magnetic layer to a web or shee

Details Method of applying a transparent magnetic layer to a web or shee Method of applying a transparent magnetic layer to a web or shee

1994-11-28

1996-11-12

Huff, Mark F.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Structurally defined

430496, 430140, 430523, 427131, 428694BS, G03C 176

Patent

active

055738974

ABSTRACT:
A method is provided for applying a magnetic layer onto a polymeric sheet or web material comprising the steps of
(i) simultaneously coextruding a non magnetic "dummy" layer and a magnetic layer onto said polymeric sheet or web material, said non magnetic "dummy" layer being closest to the support
(ii) drying the coextruded layers characterised in that the sum of the wet coating thickness of said "dummy" layer (Th.sub.dum) and of the wet coating thickness of said magnetic layer (Th.sub.mag) fulfils the equation 25 .mu.m.ltoreq.Th.sub.dum +Th.sub.mag .ltoreq.100 .mu.m and that the ratio of (Th.sub.mag) to (Th.sub.dum) fulfils the equation 0.01.ltoreq.Th.sub.mag /Th.sub.dum .ltoreq.1.

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patent: 5215874 (1993-06-01), Sakakibara
patent: 5250404 (1993-10-01), Sakakibara
patent: 5387464 (1995-02-01), Kato et al.
patent: 5389418 (1995-02-01), Ota et al.

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