Syndiotactic polybutadiene composition for a photosensitive printing plate
AssigneeUniroyal, Inc.
InventorsMilton Farber, John R. Worns
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Abstract
A photopolymer elastomeric article designed to be used primarily in a flexographic printing system comprising: a polymer matrix made up of a mixture of syndiotactic 1,2-polybutadiene and cis-1,4-polyisoprene; a photoinitiator, which is a compound, which when irradiated, will initiate polymerization and/or crosslinking; and optionally, 0-3 phr of photopolymerizable, ethylenically unsaturated crosslinking agent, as typified by esters of acrylic or methacrylic acid.
Claims26
An elastomeric composition for making a printing plate comprising (A) a mixture of syndiotactic 1,2-polybutadiene (SBD) and cis-1,4-polyisoprene (cis-IR);
- (B) between about 0.1 and 5 phr of a photoinitiator activatable by actinic radiation;
- and (C) from 0 to 3 phr of a photopolymerizable ethylenically unsaturated compound, wherein (A) comprises 30 to 75% cis-IR and correspondingly 70 to 25% SBD by weight.
An elastomeric composition for making a printing plate consisting of a mixture of syndiotactic 1,2, polybutadiene (SBD) and cis-1,4, polyisoprene (cis-IR) and between about 0.1 and 5 phr of a photoinitiator activatable by actinic radiation, wherein (A) contains between 30 and 75% by weight of cis-IR and correspondingly, 70 to 25% SBD by weight.
Dependencies are inferred from the claim text.