Appeal No. 1997-3282
Application No. 08/189,314
Appellant's invention relates to an improvement in
release liners or films used in the tape industry to provide a
release surface such that a tape can be unwound from a roll
without the adhesive sticking to the backside of the tape
(specification, pages 1-2). More particularly, the invention,
as defined in independent claim 1, is directed to a sheet
material having a pressure-sensitive acrylate-based adhesive
film and a release film wherein the release film has at least
a first layer of a polyolefin polymer having a density of no
greater than about 0.90 g/cc and a CDBI (composition 1
distribution breadth index) of greater than about 70 percent.
Alternatively, the invention, as defined in independent claim
12, is directed to a sheet material having a pressure-
sensitive acrylate-based adhesive film and a multi-layer
release film, wherein the pressure-sensitive adhesive film is
1The CDBI is defined as the weight percent of the
copolymer molecule, having a comonomer content within 50
percent (i.e. + 50%) of the median total molar comonomer
content. The CDBI and the method for its determination is
described in U.S. Patent No. 5,206,075 (specification, page
3).
2
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