Ultra-violet light curable compositions for abrasion resistant articles
AssigneeMinnesota Mining and Manufacturing Company
InventorRamon F. Hegel
Life of this patent
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Abstract
Inherently highly abrasion-resistant cast articles are prepared by polymerizing a composition comprising (I) as a first component from 0 to 100 parts of urethane polyacrylic ester and (II) as a second component, correspondingly from 100 to 0 parts of a composition containing (A) 30 to 60% by weight of a polyacrylic ester having 4 to 10 acryloyloxy groups, (B) 20 to 70% by weight of a polymerization shrinkage modifier, and (C) 0 to 30% of a diluent monomer. A source of free-radicals may be added to the composition.
Claims25
An article comprising a polymerized resin derived from (I) at least 45 parts by weight of a urethane polyacrylic ester first component having the formula ##STR10## wherein:
- R.sup.1 has the valence "a" and is the residue remaining after the removal of --NCO groups from an organic polyisocyanate;
- R.sup.2 has the valence b+1 and is a polyvalent aliphatic group having 4 to 10 carbon atoms;
- R.sup.3 is --H or --CH.sub.3 ;
- a is a number having a value of at least 2;
- and
- b is an integer of 3 to 5,
- (II) at most 55 parts by weight of a second component containing (A) from 30 to 60% by weight of a polyacrylic ester, (B) from 20 to 70% by weight of a polymerization shrinkage modifier, and (C) from 0 to 30% by weight of a diluent monomer, and (III) from 0 to 5% by weight of I plus II of a source of free radicals, said article having an inherent abrasion resistance to 000 steel wool of at least 140 kPa.
Dependencies are inferred from the claim text.