Aqueous akaline developable, UV curable urethane acrylate compounds and compositions useful for forming liquid 100 percent solids, solvent-free solder mask coatings
AssigneeM&T Chemicals Inc.
InventorsPaul L. K. Hung, Kenneth K. S. Tseng
Life of this patent
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Abstract
Aqueous alkaline developable, UV curable urethane acrylate compounds and compositions are particularly useful for making flexible, 100% solids, solvent-free solder mask coatings which are characterized by having screen-printable viscosities, rapid developability and advantageous performance characteristics.
Claims30
A liquid, UV curable, aqueous alkaline developable urethane acrylate compound comprising the reaction product of two moles each of an aliphatic or cycloaliphatic diisocyanate and a hydroxy extended alkyl acrylate monomer formed by reaction of a hydroxyalkyl acrylate and caprolactone with one mole of an alkylene polyol having 3-6 hydroxyl groups and 3-6 carbon atoms, and at least one-half mole of a dicarboxylic acid or anhydride per mole of said polyol.
A compound having the general formula:
- ##STR5## where n is 1-8, ##STR6## and a is 1-10, R.sub.1 is an aliphatic or cycloaliphatic group,
- m is 2-3,
- R.sub.2 is alkylene C.sub.1 -C.sub.6,
- y is 0-3,
- R.sub.3 is aliphatic or cycloaliphatic, saturated or unsaturated, or aromatic,
- z is 1-3;
- and
- .ltoreq. m+y+z.ltoreq.6.
A compound which is ##STR7## where a is 1-10, and
- n is 1-8.
A 100% solids, solvent-free, UV Curable aqueous developable composition comprising:
- (a) 10-50% by weight of a urethane acrylate compound which is the reaction product of (i) two moles each of an aliphatic or cycloaliphatic diisocyanate and (ii) a hydroxy extended-alkyl acrylate monomer formed by reaction of a hydroxyalkyl acrylate and caprolactone with (iii) one mole of an alkylene polyol carbon atoms, having 3-6 hydroxyl groups and 3-6 carbon atoms, and (iv) at least one mole of a carboxylic acid or anhydride per mole of said polyol;
- (b) 5-40% by weight of an aromatic urethane diacrylate formed by reaction of one mole of an aromatic diisocyanate and two moles of a hydroxyalkyl acrylate;
- (c) 2-30% by weight of an aliphatic or cycloaliphatic urethane diacrylate formed by reaction of one mole of an aliphatic or cycloaliphatic diisocyanate and two moles of a hydroxyalkyl acrylate;
- (d) 4-60% by weight of one or more reactive monomer diluents;
- and
- (e) 0.5-10% by weight of a photoinitiator.
Dependencies are inferred from the claim text.