B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/1040, 154/140
B29C 47/04 (2006.01) B29C 55/12 (2006.01) B32B 27/20 (2006.01)
Patent
CA 1289709
IMPROVED OPAQUE FILM COMPOSITIONS ABSTRACT An opaque, biaxially oriented film structure is described which comprises: an expanded thermoplastic polymer matrix core layer within which is located a minor amount of a light-absorbing pigment and a strata of voids; positioned at least substantially within at least a substantial number of said voids is at least one void-initiating particle which is phase distinct and incompatible with the matrix material, the void space occupied by said particle being substantially less than the volume of said void, with one generally cross-sectional dimension of said particle, at least approximating a corresponding cross-sectional dimension of said void; the population of voids in said core and the thickness of said core being such as to cause a degree of opacity of less than 15% light transmission; and at least one void-free thermoplastic skin layer affixed to a surface of the core layer, said skin layer(s) being of a thickness such that the outer surfaces thereof do not, at least substantially, manifest the surface irregularities of said core layer.
544850
Ashcraft Charles Ray
Paul Hee Chung Park
Spitz Joseph James
Ashcraft Charles Ray
Gowling Lafleur Henderson Llp
Mobil Oil Corporation
Paul Hee Chung Park
Spitz Joseph James
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