Ultraviolet curable formulations containing urethane acrylate monomers
AssigneeThiokol Corporation
InventorYuan C. Chu
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Abstract
A coating composition comprising a radiation curable oligomer and a reactive diluent having the formula: ##STR1## wherein R' is a monovalent aromatic or alkyl radical including from 4 to about 20 carbon atoms, R.sup.2 is a divalent alkyl radical including from about 2 to about 4 carbon atoms, and R.sup.3 is hydrogen or methyl. Addition of the reactive diluent not only reduces the viscosity of the uncured composition to an acceptable value for use as a coating but also surprisingly increases the elongation of the cured coating without reducing its tensile strength. Superior coatings for floor tiles, flooring, and other applications are thus provided.
Claims16
A radiation-curable coating composition, comprising:
- A. from about 25% to about 95% by weight of an oligomeric polyethylene adipate linked to terminal acrylate moieties by toluene urethane linkages, and B. from about 5% to about 75% by weight of a reactive diluent having the formula:
- ##STR6## wherein R' is a monovalent aromatic or alkyl radical including from 4 to about 20 carbon atoms, R.sup.2 is a divalent alkyl radical including from about 2 to about 4 carbon atoms, and R.sup.3 is hydrogen or methyl.
A method for reducing the viscosity of a radiation-curable coating material, comprising the steps of:
- A. providing a radiation-curable coating oligomer which is usually highly viscous;
- and
- B. adding to said coating oligomer a viscosity-reducing amount of a reactive diluent having the formula:
- ##STR7## wherein R' is a monovalent aromatic or alkyl radical including from about 4 to about 20 carbon atoms, R.sup.2 is a divalent alkyl radical including from about 2 to about 4 carbon atoms, and R.sup.3 is hydrogen or methyl.
Dependencies are inferred from the claim text.