Biaxally-oriented polypropylene films containing a non-crystallizable, amorphous polyester layer, and method of making the same
First Claim
1. A method of making a multilayer film, comprising the steps of:
- (a) forming a core layer comprising a polypropylene film;
(b) monoaxially orienting the core layer in a first direction;
(c) providing at least one multilayer cap layer to at least one side of the core layer to provide a multilayer film, the cap layer comprising;
(i) a non-crystallizable, amorphous polyester layer comprising a sufficient proportion of a non-crystallizable, amorphous polyester to render the amorphous polyester layer non-crystallizable;
(ii) a first tie layer interposed between the polyester layer and the core layer, the first tie layer comprising an adhesive; and
, (d) orienting the multilayer film in a second direction transverse to the first direction.
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Accused Products
Abstract
A method of making a multilayer film is provided, including the steps of forming a core layer of a polypropylene film, monoaxially orienting the core layer in a first direction, and providing at least one multilayer cap layer to at least one side of the core layer to provide a multilayer film. The cap layer includes a non-crystallizable, amorphous polyester layer having a sufficient proportion of a non-crystallizable, amorphous polyester to render the amorphous polyester layer non-crystallizable and a first tie layer interposed between the polyester layer and the core layer, the first tie layer including an adhesive. The multilayer film is then oriented in a second direction transverse to the first direction.
122 Citations
26 Claims
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1. A method of making a multilayer film, comprising the steps of:
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(a) forming a core layer comprising a polypropylene film;
(b) monoaxially orienting the core layer in a first direction;
(c) providing at least one multilayer cap layer to at least one side of the core layer to provide a multilayer film, the cap layer comprising;
(i) a non-crystallizable, amorphous polyester layer comprising a sufficient proportion of a non-crystallizable, amorphous polyester to render the amorphous polyester layer non-crystallizable;
(ii) a first tie layer interposed between the polyester layer and the core layer, the first tie layer comprising an adhesive; and
,(d) orienting the multilayer film in a second direction transverse to the first direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A multilayer film, comprising:
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(a) a core layer comprising a polypropylene film monoaxially oriented in a first direction;
(c) at least one multilayer cap film provided on said core layer to provide a multilayer film, said cap film comprising;
(i) a non-crystallizable, amorphous polyester layer comprising a sufficient proportion of a non-crystallizable, amorphous polyester to render said amorphous polyester layer non-crystallizable; and
(ii) a first tie layer interposed between said polyester layer and said core layer, said first tie layer comprising an adhesive; and
,(d) said multilayer film oriented in a second direction transverse to said first direction.
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Specification