Cloth-like polymeric films
Assignee3M Innovative Properties Company
InventorsJeffery Jackson, Dennis L. Krueger
Life of this patent
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Abstract
A polymeric film having a plurality of perforations is described. The polymeric film provides a strong, high-tensile strength material that permits hand tearing of the film along one or two axes. In specific implementations, the polymeric film is incorporated into a multi-layer film having cloth-like properties of strength and tear propagation, and is suitable for use various adhesive tape applications. Methods of making the polymeric film are also disclosed.
Claims61
A composite polymeric film comprising:
- (a) an oriented first polymeric film having first and second surfaces and a plurality of perforations through the first and second surfaces, the perforations having a raised ridge at their boundaries;
- and
- (b) a second polymeric film applied to either the first or second surface of the first polymeric film and substantially covering the perforations in the first polymeric film.
A polymeric sheet comprising:
- a polymeric film having a first and second surface;
- and
- a plurality of perforations in the polymeric film extending through the first and second surfaces, the perforations each defining an open area therewithin and having a raised ridge at their boundaries, and the perforations having a length greater than their width;
- wherein the perforations are arranged such that an extension of the major axis of each of perforation extends through an adjacent perforation.
A composite polymeric sheet comprising:
- a first polymeric material having a plurality of perforations having a raised ridge at their boundaries;
- and
- a second polymeric material affixed to the first polymeric material,
- wherein the composite polymeric sheet has a tear propagation force at least 10 percent of the tear initiation force in at least one direction.
A method of making a composite polymeric film, the method comprising:
- (a) providing an oriented polymeric film comprising a first polymeric composition;
- (b) perforating the oriented film, the perforations having a raised ridge at their boundaries;
- (c) applying a second polymeric composition to the oriented polymeric film.
A composite polymeric film comprising:
- (a) an oriented first polymeric film having first and second surfaces and a plurality of perforations through the first and second surfaces, the perforations having a raised ridge at their boundaries;
- and
- (b) a second polymeric film applied to either the first or second surface of the first polymeric film and substantially covering the perforations in the first polymeric film wherein the composite polymeric film is hand tearable in two perpendicular directions.
A composite polymeric film comprising:
- (a) an oriented first polymeric film having first and second surfaces and a plurality of perforations through the first and second surfaces, the perforations each defining an open area therewithin in the first film and having a raised ridge at their boundaries;
- and
- (b) a second polymeric film applied to either the first or second surface of the first polymeric film and substantially covering the perforations in the first polymeric film.
A composite polymeric film comprising:
- (a) an oriented first polymeric film having first and second surfaces and a plurality of perforations through the first and second surfaces, the perforations having a raised ridge at their boundaries;
- (b) a second polymeric film applied to either the first or second surface of the first polymeric film and substantially covering the perforations in the first polymeric film;
- and
- (c) an adhesive composition positioned on an exterior surface of the composite polymeric film.
Dependencies are inferred from the claim text.