Filing Information

Inventor(s)	William R. Berggren · Shelby J. Brownley ·
Assignee(s)	Minnesota Mining and Manufacturing Co. ·  View assignee updates
Attorney/Agent(s)	Cruzan Alexander ·
Primary Examiner	Jack P. Brammer ·
Application Number	US6158951
Filing date	06/19/1980
Issue date	09/22/1981
Predicted expiration date	10/18/1998
U.S. Classifications	430/253  · 204/159.23  ·
International Classifications	G03C 1112  ·
Kind Code	A
International Classifications	430253;260;271;273;280;281;322 ·
Related U.S. Application Data	CROSS REFERENCE TO RELATED APPLICATION This is a continuation-in-part of copending application Ser. No. 67,322 filed Oct. 18, 1978, now abandoned.

Patent Family

Abstract

An imageable composite dry-transfer sheet that comprises (a) a cover sheet transmissive to actinic radiation that has at least one oleophilic surface, (b) a photopolymerizable layer on the oleophilic surface of the cover sheet that comprises a cationically polymerizable organic material, a cationic photopolymerization initiator, and, optionally, a thermoplastic hydrocarbon resin that is chemically inert to said organic material and said initiator and (c) a base sheet with an oleophobic surface on the photopolymerizable layer wherein, after image-wise exposure to activating radiation, the interfacial adhesion of the unexposed areas of the photopolymerizable layer is greater for the cover sheet than for the base sheet; the interfacial adhesion of the exposed areas of the photopolymerizable layer is greater for the base sheet than for the cover sheet; and wherein, after separation of the cover and base sheets, the unexposed areas of the photopolymerizable layer are rendered burnishable by subsequent exposure to activating radiation through the cover sheet.

Independent Claims | See all claims (31)

1. 1. An imageable composite dry-transfer sheet that comprises (a) a cover sheet that is transmissive to activating radiation and has at least one oleophilic surface, (b) a photopolymerizable layer on the oleophilic surface of said cover sheet that comprises a cationically polymerizable organic material, and from about 0.1 to 10 parts by weight per 100 parts by weight of said organic material of a cationic photopolymerization initiator, and (c) a base sheet that has an oleophobic surface in contact with said photopolymerizable layer;wherein said photopolymerizable layer has a complex shear modulus of, at most, 1.times.10.sup.6 dyne/cm.sup.2 ; andwherein, after image-wise exposure to activating radiation, the interfacial adhesion of the unexposed areas of said photopolymerizable layer is greater for said cover sheet than for said base sheet; the interfacial adhesion of the exposed areas of said photopolymerizable layer is greater for said base sheet than for said cover sheet; andwherein, after separation of said cover and said base sheets, the unexposed areas of said layer are rendered burnishable by subsequent exposure to activating radiation through said cover sheet.