Minnesota Mining and Manufacturing Company

James J Pedginski

Albert I Everaerts

Ronald Wayne Ausen

Thomas P Hanschen

Steven S Kantner

Walter R Romanko

Stephen W Bany

Raymond R Rivera

James E Sax

Ronald B Birkholz

Roy Wong

Andrew H Wong

The present invention provides a release coated film, an adhesive tape comprising a release coated film, and processes for preparing the same. The fluoropolymer release layer comprises a graft copolymer of (i) a base polymer containing polymerized units derived from monomers having terminal olefinic double bonds, and (ii) a moiety comprising a fluoroaliphatic group. The film may be coextruded and may subsequently be oriented in at least one direction. Alternately, the release coating can be extrusion coated onto a backing and may be subsequently oriented if the backing is orientable. Adhesives may be coated onto the release coated films either before or after orientation, or they may be coextruded along with the release coating and/or backing.

Extrudable release coating

A tape comprising a biaxially-oriented backing made from a polymeric film bearing on one major surface thereof a layer of pressure-sensitive adhesive and on the other major surface thereof a layer of low-adhesion backsize composition. The backing and the layer of pressure-sensitive adhesive intermix so as to form a commingled layer between them. This invention also provides a process of preparing pressure-sensitive adhesive tape comprising the steps of (1) providing an extruded polymeric film backing, (2) orienting said backing in the machine direction, (3) applying a low-adhesion backsize layer to one major surface of said backing, (4) applying a pressure-sensitive adhesive layer to the major surface of said backing not bearing the low-adhesion backsize layer, (5) orienting the layer-bearing backing in the transverse direction by heating and cross-stretching the layer-bearing backing, (6) winding the machine direction oriented, transverse direction oriented, layer-bearing backing onto a roll, and (7) optionally, converting the machine direction oriented, transverse direction oriented, layer-bearing backing to form a tape.

Pressure-sensitive adhesive tape and a process for producing same

A tape comprising a biaxially-oriented backing made from a polymeric film bearing on one major surface thereof a layer of pressure-sensitive adhesive and on the other major surface thereof a layer of low-adhesive backsize composition. The backing and the layer of pressure-sensitive adhesive intermix so as to form a commingled layer between them. This invention also provides a process of preparing pressure-sensitive adhesive tape comprising the steps of (1) providing an extruded polymeric film backing, (2) orienting said backing in the machine direction, (3) applying a low-adhesive backsize layer to one major surface of said backing, (4) applying a pressure-sensitive adhesive layer to the major surface of said backing not bearing the low-adhesion backsize layer, (5) orienting the layer-bearing backing in the transverse direction by heating and cross-stretching the layer-bearing backing, (6) winding the machine direction oriented, transverse direction oriented, layer-bearing backing onto a roll, and (7) optionally, converting the machine direction oriented, transverse direction oriented, layer-bearing backing to form a tape.

Processs for producing pressure-sensitive adhesive tape

A tape comprising a polypropylene backing coated on one surface with an adhesive. The backing is biaxially oriented to provide a secant modulus of elasticity measured at one percent elongation in its longitudinal direction of at least about 25.times.10.sup.5 kilopascals, will break before it can be stretched in its longitudinal direction by about 55 percent and can be transversely cut by forces of less than about 13 newtons on the cutters of commercially available tabletop tape dispensers.

Dispensable polypropylene adhesive-coated tape

Growing community of inventors

Stillwater, MN, United States of America

James J Pedginski