Biaxially oriented opaque polyolefin multi-layer film

Details Biaxially oriented opaque polyolefin multi-layer film Biaxially oriented opaque polyolefin multi-layer film

1987-09-11

1991-01-08

Sluby, P. C.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428349, 428447, 428331, 428330, 428516, 428906, 26421112, 427 39, B32B 2708, B29C 4516

Patent

active

049834479

ABSTRACT:
An opaque polyolefin film having a base layer composed essentially of propylene polymers and having sealing layers present on both sides, composed essentially of sealable olefin polymers, is disclosed. From about 0.2% to 1.5% by weight, relative to the layer of polydialkylsiloxane is incorporated in one of the two sealing layers, and this layer has not been subjected to corona treatment. The other sealing layer has been subjected to corona treatment and has polydialkylsiloxane, not incorporated, but present on the outer surface of this layer, the polydialkylsiloxane having been transferred to this layer by contact between the sealing layer in which polydialkylsiloxane is incorporated. The relative polydialkylsiloxane occupancy of this layer, which is determined by means of ESCA spectroscopy, is not more than 15. The three-layer opaque polyolefin film is prepared by the coextrusion process. It is particularly suitable for use as a packaging film on high-speed packaging machines.

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Ullmanns Encyklopaedie der Technischen Chemie, 4th Ed., vol. 2, pp. 539-553.

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