Abrasion resistant coating for foamed plastic substrates
AssigneeOwens-Illinois, Inc.
InventorEdgardo Santiago
Life of this patent
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Abstract
A protective coating composition is applied to the decorated and/or printed surface of a foamed plastic substrate to provide abrasion resistance, high gloss, and lubricity. Preferably, the composition is comprised of a water-based mixture of polyurethane resin and emulsified polyethylene resin, the latter being emulsified with an ionic or non-ionic emulsifier. The composition is especially useful for application over the exterior of foamed plastic surfaces which have been decorated and/or printed with printing inks prior to fabrication of the material into plastic articles.
Claims6
A synthetic varnish composition adapted to be applied by conventional printing techniques and equipment to films of foamed plastic substrates to provide an adherent, lubricious, abrasion resistant, protective coating thereon, said composition comprising an emulsified aqueous mixture of polyurethane resin and polyethylene resin having a solids ratio ranging from 1:9 to 1:1, said polyethylene resin being emulsified with a non-ionic or anionic emulsifying agent, and up to 30% by weight of a low molecular weight alcohol, the amount of said alcohol being sufficient to depress the surface tension and coefficient of friction of said composition to improve printability and lubricity thereof and provide long-term shelf stability to said composition, the viscosity of said composition ranging from about 18 to 35 seconds as measured by Zahn Cup No. 2 at 65.degree. to 85.degree. F.
A synthetic varnish composition adapted to be applied by conventional printing techniques and equipment to films of foamed plastic substrates to provide an adherent, lubricious, abrasion resistant, protective coating thereon, said composition consisting essentially of an emulsified aqueous mixture of polyurethane resin and polyethylene resin having a solids ratio of about 1:1, said polyethylene resin being emulsified with a non-ionic emulsifying agent consisting essentially of nonylphenoxy poly(ethyleneoxy)ethanol, and up to 30% by weight of isopropyl alcohol, the amount of said isopropyl alcohol being sufficient to depress the surface tension and coefficient of friction of said composition to improve printability and lubricity thereof and provide long-term shelf stability to said composition, the viscosity of said composition ranging from about 18 to 35 seconds as measured by Zahn Cup No. 2 at 65.degree. to 85.degree. F.
Dependencies are inferred from the claim text.