Back to results
US 4,304,923 AGranted
Photopolymerizable oligomer
AssigneeMinnesota Mining and Manufacturing Company
InventorAlan D. Rousseau
Life of this patent
Estimating the term…
Abstract
Ethylenically unsaturated polymerizable oligomers, which are particularly useful in printing plate compositions, comprise backbones formed by the removal of hydrogen from hydroxyl groups and having bonded thereto both carboxylic acid groups and ethylenically unsaturated, free radical polymerizable groups, these last two groups bonded to the backbone through the reaction of isocyanate groups.
Claims7
A polymerizable oligomer of the formula ##STR13## wherein E is an ethylenically unsaturated, free radical polymerizable group,
- D is the residue of a polyisocyanate having at least two of its isocyanate groups reacted to form ##STR14## bonded to E and R, R is the residue of a polyol having at least a+b hydroxyl groups, the residue formed by removal of hydrogen from the hydroxyl groups, said polyol having a number average molecular weight between 90 and 10,000,
- A is a carboxylic acid containing group,
- a is a number having an average value between 2 and 20, and
- b is a number having an average value between 0.3 and 10.
1 more element
Dependencies are inferred from the claim text.