Supports for printing plates
First Claim
1. In a support for use in making a printing plate using a liquid photosensitive resin selected from the group consisting of polyester resin, polyurethane resin and mixtures thereof, the support comprising (A) a base plate, (B) an adhesive layer formed on the surface of the base plate, and (C) an activating layer formed on the surface of the adhesive layer;
- the improvement wherein the activating layer (C) comprises as an activating agent a phosphorus compound (a) selected from the group consisting of tertiary phosphite compound (a-i) and tertiary phosphine compound (a-ii) in an amount of about 10-100 weight percent and having a thickness of 0.1-50 microns.
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Abstract
An improved support comprising (A) a base plate and (B) an adhesive layer formed on the surface of the base plate is provided for making a printing plate from a liquid photosensitive resin. The improvement resides in the inclusion of a tertiary phosphite or tertiary phosphine in the adhesive layer. The improved adhesive layer acts to give reliefs of a good shoulder shape, and this action can be retained over long periods of time.
In an alternative embodiment, an activating layer (C) containing a tertiary phosphite or tertiary phosphine is formed on the adhesive layer.
13 Citations
25 Claims
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1. In a support for use in making a printing plate using a liquid photosensitive resin selected from the group consisting of polyester resin, polyurethane resin and mixtures thereof, the support comprising (A) a base plate, (B) an adhesive layer formed on the surface of the base plate, and (C) an activating layer formed on the surface of the adhesive layer;
- the improvement wherein the activating layer (C) comprises as an activating agent a phosphorus compound (a) selected from the group consisting of tertiary phosphite compound (a-i) and tertiary phosphine compound (a-ii) in an amount of about 10-100 weight percent and having a thickness of 0.1-50 microns.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 10, 11)
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8. In a support for use in making a printing plate using a liquid photosensitive resin, the support comprising (A) a base plate and (B) an adhesive layer formed on the surface of the base plate;
- the improvement wherein the adhesive layer (B) comprises as an activating agent for liquid photosensitive resins a phosphorus compound (a) selected from the group consisting of tertiary phosphite compounds (a-i) and teritary phosphine compounds (a-ii) in an amount of about 10-100 weight percent and having a thickness of 0.1-50 microns.
- View Dependent Claims (9)
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12. The combination of a light-sensitive element support and a liquid photosensitive resin for use in making a printing plate comprising as the support (A) a base plate, (B) an adhesive layer formed on the surface of the base plate, and (C) an activating layer formed on the surface of the adhesive layer and comprising a phosphorus compound (a) selected from the group consisting of tertiary phosphite compound (a-i) and tertiary phosphine compound (a-ii) in an amount of about 10-100 weight percent and having a thickness of 0.1-50 microns;
- said liquid photosensitive resin being in the form of a layer overlying said activating layer (C), said liquid photosensitive resin being selected from the group consisting of polyester resin, polyurethane resin and mixtures thereof.
- View Dependent Claims (13, 14, 15, 16, 17, 18, 24, 25)
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19. The combination of a light-sensitive element support and a liquid photosensitive resin for use in making a printing plate comprising as the support (a) a base plate and (B) an adhesive layer formed on the surface of the base plate, said adhesive layer comprising an activating agent for said liquid photosensitive resin which is a phosphorus compound (a) selected from the group consisting of tertiary phosphite compound (a-i) and tertiary phosphine compound (a-ii) in an amount of about 10-100 weight percent and an adhesive, said layer having a thickness of about 0.1 to 50 microns;
- said liquid photosensitive resin being in the form of a layer overlying said adhesive layer (B), said liquid photosensitive resin being selected from the group consisting of polyester resin, polyurethane resin and mixtures thereof.
- View Dependent Claims (20, 21, 22, 23)
Specification