Flexographic printing plate comprising photosensitive elastomer polymer composition

• US 5,223,375 A
• Filed: 07/15/1991
• Issued: 06/29/1993
• Est. Priority Date: 07/15/1991
• Status: Expired due to Term

• Current Assignee: PT Sub, Inc.
• Original Assignee: W R Grace & Company - CONN (Standard Industries Holdings, Inc.)
• Inventors: Berrier, Arthur L., Kanga, Rustom S.
• Primary Examiner(s): McCamish, Marion E.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US07/729,976
• Time in Patent Office: 715 Days
• Field of Search: 430/281, 430/288, 430/286, 430/907, 430/300, 522/6
• US Class Current: 430/281.1
• CPC Class Codes: C08F 297/00 Macromolecular compounds obtained by successively polymerising different monomer systems using a catalyst of the ionic or coordination type without deactivating the intermediate polymer
• CPC Class Codes: C08F 297/02 using a catalyst of the anionic type
• CPC Class Codes: C08F 8/44 Preparation of metal salts or ammonium salts
• CPC Class Codes: Y10S 430/108 Polyolefin or halogen containing

Abstract

Flexographic photosensitive printing plates are made with formulations comprising triblock polymers of poly(vinylpyridine)-poly(butadiene) or poly(isoprene)poly(vinylpyridine). The polymers may be quaternized. When made with quaternized polymers, the plates after imaging with UV may be developed in aqueous solutions.

Claims

1. Photosensitive flexographic printing plate comprising a backing, and thereon a layer of a mixture comprising a triblock polymer of the structure ABA or A'"'"'BA'"'"', a photosensitive unsaturated compound, and a photoinitiator;

where

A is ##STR4## A'"'"' is ##STR5## B is ##STR6## X is a leaving group;

R, R¹, and R³ are independently H or 1-8 carbon alkyl;

R² is H, 1-8 carbon alkyl, or aralkyl;

a has a value in the range of about 50-1,000;

b has a value in the range of about 500-10,000.

2. A printing plate according to claim 1 wherein the triblock polymer has the structure ABA.

3. A printing plate according to claim 1 wherein the triblock polymer has the structure A'"'"'BA'"'"'.

4. A printing plate according to claim 1 where R³ is H.

5. A printing plate according to claim 1 where R³ is methyl.

6. A printing plate according to claim 1 where A'"'"' is quaternized poly(4-vinylpyridine), R² is methyl;

X is iodide or bromide;

R³ is H or methyl;

a is about 70-475; and

b is about 1200-6000 where R³ is H and is about 1000-5000 where R³ is methyl.

7. A printing plate according to claim 1 wherein the photosensitive unsaturated compound is hexanediol dimethacrylate.