Polyolefin-extrusion coating compositions having good coatability, good adhesion to the substrate, and good chill roll release
AssigneeEastman Chemical Company
InventorsRay Edwards, Bruce W. Foster
Life of this patent
Estimating the term…
Abstract
Disclosed is a novel polyethylene composition that is a blend of a polyethylene component having defined properties, a specific quantity of a defined tackifying resin and a very specific minute quantity of a unique amide of a fatty acid. The novel composition can be used in a process for extrusion coating at high speeds and relatively low extrusion coating temperatures with good adhesion to the substrate and dramatically improved chill roll release.
Claims17
A process for the low-temperature extrusion coating of a substrate with a polyethylene film having a thickness of at least about 0.0075 mm, said process comprising:
- applying a polyethylene extrusion coating composition to at least one surface of said substrate by extrusion coating at a temperature in the range of 175.degree. to 290.degree. C., said polyethylene extrusion coating composition comprising;
- (a) a polyethylene component having a melt index in the range of about 2 to 100 dg per minute at 190.degree. C. and having a sufficiently broad molecular weight distribution so that the resulting composition is capable of being extrusion coated at a temperature in the range of 175.degree. C. to 290.degree. C.,
- (b) about 2 to 20 weight percent, based on the total weight, of a tackifying resin having a RBSP in the range of about 100.degree. to 140.degree. C., and
- (c) about 0.03 to 0.07 weight percent, based on the total weight of the fatty acid amide, erucamide.
An article of manufacture comprising a substrate having adhered thereto a polyethylene composition comprising:
- (a) a polyethylene component having a melt index in the range of about 2 up to 100 dg per minute at 190.degree. C. and having a sufficiently broad molecular weight distribution so that the resulting composition is capable of being extrusion coated at a temperature in the range of 175.degree. up to 290.degree. C.,
- (b) about 2 up to 20 weight percent of a tackifying resin having a RBSP in the range of about 100.degree. up to 140.degree. C., and
- (c) about 0.03 to 0.07 weight percent of the fatty acid amide, erucamide.
Dependencies are inferred from the claim text.