Abstract: A film for print laminates comprises a film substrate and a heat-sensitive adhesive resin layer made of polyethylene, a copolymer containing at least 70 wt % of ethylene or a mixture of polymers at least 70 wt. % in total ethylene content. The resin layer is surface-treated by corona discharge in a nitrogen gas atmosphere having an oxygen concentration of less than 20.9 vol. % and has incorporated therein 0.2 to 5 wt. % of a finely divided white material having a mean particle size of 0.2 to 20 microns. When laminated to a print such as printed paper, the film permits the print to retain its original finish and color free of changes despite the lamination.
Abstract: A pressure-sensitive adhesive tape comprising a plurality of superimposed layers, at least one outer layer being a pressure-sensitive adhesive layer, contiguous layers defining an interface therebetween, each of the layers comprising a photopolymerized matrix of polymeric chains; the polymeric chains extending from the matrix of one of the layers through the interface into the matrix of a contiguous layer; the polymeric chains comprising polymerized monomers having migrated from the matrix of each contiguous layer prior to polymerization, whereby the layers cannot be delaminated.
Type:
Grant
Filed:
August 17, 1987
Date of Patent:
April 4, 1989
Assignee:
Minnesota Mining and Manufacturing Company
Inventors:
Patrick G. Zimmerman, Gordon G. Johnson, Susan L. Korpela, Caroline L. Vernon