Polyester-containing biaxially-oriented polypropylene films
AssigneeApplied Extrusion Technologies, Inc.
InventorsAlan M. Davis, John H. Lawrence, Tung-Yao Weng
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Abstract
Polyester-containing multilayer biaxially-oriented polypropylene films are provided. According to the invention, a two- or three-layer polyester-containing cap layer is bonded to a monoaxially oriented polypropylene core, followed by orientation of the resulting composite in a direction transverse to the direction of orientation of the core layer. At least one tie layer is interposed between the core and the polyester. Advantageously, the polyester contains silicone fluid as a processing aid.
Claims14
A biaxially-oriented multilayer film having a core layer comprising a polyolefin film, at least one silicone-fluid-containing polyester layer, and at least one tie layer interposed between the core and polyolefin layers prepared by the steps of:
- (a) forming a core layer comprising a polypropylene film;
- (b) monoaxially orienting the core layer in a first direction;
- (c) coating or laminating a multilayer cap film to at least one side of the monoaxially oriented core layer to provide a multilayer film, said cap film comprising at least one polyester layer and at least a first tie layer with said first tie layer interposed between said polyester layer and said core layer, said first tie layer comprising a polyolefin adhesive, and said polyester layer containing sufficient silicone fluid to impart substantially uniform stretching characteristics thereto;
- (d) orienting said multilayer film of step (c) in a second direction transverse to said first direction to provide a biaxially-oriented multilayer film;
- and,
- (e) thereafter metallizing an outer surface of said multilayer film opposite said polyester layer.
A biaxially-oriented multilayer film having a core layer comprising a polyolefin film, at least one silicone-fluid-containing polyester layer, and at least one tie layer interposed between the core and polyolefin layers prepared by the steps of:
- (a) forming a core layer comprising a polypropylene film, said core layer containing at least one incompatible inorganic mineral in an amount sufficient to render said core substantially opaque;
- (b) monoaxially orienting the core layer in a first direction;
- (c) coating or laminating a multilayer cap film to at least one side of the monoaxially oriented core layer to provide a multilayer film, said cap film comprising at least one polyester layer and at least a first tie layer with said first tie layer interposed between said polyester layer and said core layer, said first tie layer comprising a polyolefin adhesive, and said polyester layer containing sufficient silicone fluid to impart substantially uniform stretching characteristics thereto;
- and,
- (d) orienting said multilayer film of step (c) in a second direction transverse to said first direction to provide a biaxially-oriented multilayer film.
A biaxially-oriented multilayer film having a core layer comprising a polyolefin film, at least one silicone-fluid-containing polyester layer, and at least one tie layer interposed between the core and polyolefin layers prepared by the steps of:
- (a) forming a core layer comprising a polypropylene film;
- (b) monoaxially orienting the core layer in a first direction;
- (c) coating or laminating a multilayer cap film to at least one side of the monoaxially oriented core layer to provide a multilayer film, said cap film comprising at least one polyester layer and at least a first tie layer with said first tie layer interposed between said polyester layer and said core layer, said first tie layer comprising a polyolefin adhesive, and said polyester layer containing sufficient silicone fluid to impart substantially uniform stretching characteristics thereto;
- and,
- (d) orienting said multilayer film of step (c) in a second direction transverse to said first direction to provide a biaxially-oriented multilayerfilm, wherein said multilayer film contains at least one additive selected from the group consisting of antioxidants, lubricants, surfactants, antistats, slip agents, antiblock agents, nucleating agents, coupling agents, coated minerals, pigments, and dyes.
A biaxially-oriented multilayer film having a core layer comprising a polyolefin film, at least one silicone-fluid-containing polyester layer, and at least one tie layer interposed between the core and polyolefin layers prepared by the steps of:
- (a) forming a core layer comprising a polypropylene film;
- (b) monoaxially orienting the core layer in a first direction;
- (c) coating or laminating a multilayer cap film to at least one side of the monoaxially oriented core layer to provide a multilayer film, said cap film comprising at least one polyester layer and at least a first tie layer with said first tie layer interposed between said polyester layer and said core layer, said first tie layer comprising an adhesive selected from the group consisting of copolymers of ethylene with at least one carboxylic acid or carboxylic acid anhydride and terpolymers of ethylene, an ester, and a carboxylic acid or carboxylic acid anhydride, and said polyester layer containing sufficient silicone fluid to impart substantially uniform stretching characteristics thereto;
- and,
- (d) orienting said multilayer film of step (c) in a second direction transverse to said first direction to provide a biaxially-oriented multilayer film.
Dependencies are inferred from the claim text.