Carbamated poly(vinyl alcohol) useful as a binder in elastomeric photopolymer compositions

• US 4,340,686 A
• Filed: 01/13/1981
• Issued: 07/20/1982
• Est. Priority Date: 05/29/1979
• Status: Expired due to Fees

• Current Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Original Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Inventors: Foss, Robert P.
• Primary Examiner(s): Levin, Stanford M.
• Application Number:
  US06/224,685
• Time in Patent Office: 553 Days
• Field of Search: 525/59, 525/61
• US Class Current: 525/59
• CPC Class Codes: C08F 16/06 Polyvinyl alcohol ; Vinyl alcohol
• CPC Class Codes: C08F 8/00 Chemical modification by after-treatment graft polymers, block polymers, crosslinking with unsaturated monomers or with polymers C08F251/00 - C08F299/00; of conjugated diene rubbers C08C
• CPC Class Codes: C08F 8/14 Esterification
• CPC Class Codes: C08F 8/30 Introducing nitrogen atoms or nitrogen-containing groups
• CPC Class Codes: G03F 7/033 the binders being polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
• CPC Class Codes: Y10S 430/106 Binder containing
• CPC Class Codes: Y10S 430/107 Polyamide or polyurethane
• CPC Class Codes: Y10S 430/11 Vinyl alcohol polymer or derivative

Abstract

Flexographic printing plates are prepared from photosensitive elastomeric compositions which comprise

(1) about 15 to about 89 percent by weight of a carbamated poly(vinyl alcohol) polymeric binder,

(2) about 10 to about 70 percent by weight of a compatible monomer, and

(3) about 0.1 to about 10 percent by weight of a free-radical generating system.

Claims

1. A carbamated poly(vinyl alcohol) which comprises 15 to 100 mole percent of recurring units having the formula ##STR10## wherein R is NH₂ in some recurring units and at least one of OR¹ and NHR¹ in the remaining recurring units, wherein the units which contain OR¹ and NHR¹ are derived by reaction of said units wherein R is NH₂ with R¹ OH, R¹ OH being an alcohol which has a boiling point of greater than 100°

C. at normal atmospheric pressure, with the proviso that said alcohol is compatible with said carbamated poly(vinyl alcohol), and the ratio of (OR¹ +NHR¹)/NH₂ is within the range of 0.05 to 1.0, and 0 to 85 mole percent of recurring units having a formula selected from the group consisting of ##STR11## with the proviso that no more than 12 mole percent of the recurring units have the formula ##STR12##

2. The carbamated poly(vinyl alcohol) of claim 1 wherein 30 to 50 mole percent of the recurring units have the formula ##STR13## the ratio of (OR¹ +NHR¹)/NH₂ is within the range of 0.1 to 0.3, and 50 to 70 mole percent of recurring units have a formula selected from the group consisting of ##STR14##