UV curable coating composition
AssigneeHenkel AG & Co. KGaA
InventorsAndrew Trevithick Slark, Mireia Diaz Simo
Life of this patent
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Abstract
The invention provides an isocyanate free UV curable hot melt composition which may be hardened upon exposure to UV radiation to provide a protective coating. The coating is particularly useful in wood-working and furniture applications.
Claims18
An isocyanate free, radiation curable hot melt coating composition comprising a solvent-free radiation curable polymer component;
- an oligomer component;
- a photoinitiator and optionally a monomer component, wherein
- the polymer component comprises poly(meth)acrylate segments and polyurethane segments, has a Mn>2000 g per mole and has at least one functional group polymerisable under UV radiation,
- the oligomeric component has Mn from 500 to 5000 g per mole and contains at least two functional groups polymerisable under UV radiation,
- the monomer component has Mn from 100 to 1000 g per mole and contains at least one functional group polymerisable under UV radiation, and
- the coating composition is solid at room temperature and has a melt viscosity greater than about 3700 cP at the coating composition application temperature.
An isocyanate free coating composition comprising a solvent-free radiation curable hot melt composition consisting essentially of 60%-95% of a polymer component, 5-40% of an oligomeric component and 0.1-10% of a photoinitiator, wherein
- the polymer component comprises poly(meth)acrylate segments and polyurethane segments, has a Mn>2000 g per mole and has at least one functional group polymerisable under UV radiation and
- the oligomeric component has Mn from 500 to 5000 g per mole and contains at least two functional groups polymerisable under UV radiation.
A hot melt, isocyanate free, solvent-free coating composition comprising a solvent-free, radiation curable polymer component, an oligomeric component, a monomer component, and a photoinitiator, wherein
- the polymer component comprises poly(meth)acrylate segments and polyurethane segments, has a Mn>2000 g per mole and has at least one functional group polymerisable under UV radiation,
- the oligomeric component has Mn from 500 to 5000 g per mole and contains at least two functional groups polymerisable under UV radiation,
- the monomer component has Mn from 100 to 1000 g per mole and contains at least one functional group polymerisable under UV radiation, and
- the coating composition has a melting point of about 70° C. to about 110° C. and the melt viscosity of the coating composition is greater than about 3700 cP at the coating composition application temperature.
Dependencies are inferred from the claim text.