# US 10,370,466 B2 · Processing aid and blend employing the processing aid for achieving effective orientation of an extruded film layer and a biaxially oriented film including such film layer

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- Number: US 10,370,466 B2
- Document ID: US10370466B2
- Status: Granted
- Kind: B2
- Application number: 15/544,991
- Filed: 2016-01-21
- Published: 2018-01-11
- Granted: 2019-08-06
- Earliest claimed: 2015-01-21
- Assignees: Tagleef Industries Inc.
- Applicants: Taghleef Industries Inc.
- Inventors: Anthony J. Denicola, Jr.; Andrew F. Wilkie
- Web page: https://patentgrep.com/patent/US10370466B2

## CPC

- C08F 110/06: Propene
- B32B 27/08: of synthetic resin
- B32B 27/327: {comprising polyolefins obtained by a metallocene or single-site catalyst}
- B32B 37/15: with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
- C08J 5/18: Manufacture of films or sheets
- C08L 23/10: Homopolymers or copolymers of propene
- C08L 23/12: Polypropene
- B32B 2307/518: bi-axially
- B32B 2307/54: Yield strength; Tensile strength
- B32B 2307/704: Crystalline
- B32B 2391/00: Waxes
- C08J 2323/12: Polypropene
- C08J 2423/12: Polypropene
- C08J 2491/06: Waxes
- C08L 2203/16: used for films
- C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
- C08L 2205/12: containing additives being liquid crystalline or anisotropic in the melt
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

Processing aid for aiding in orienting an extruded film layer including a preponderance, by weight, of a high crystalline polypropylene is a crystalline polypropylene wax. An oriented film layer including a blend of crystalline polypropylene wax and high crystallinity polypropylene homopolymer is part of the invention. The invention includes a method of forming an oriented film layer including a preponderance by weight of a high crystallinity polypropylene and includes the steps of blending a high crystallinity polypropylene with a crystalline polypropylene wax, directing the blend through an extruder to form a film layer and then orienting the film layer. The invention includes a biaxially oriented, multi-layer film including a base layer and at least one skin layer. The base layer includes a blend of crystalline metallocene catalyzed polypropylene wax and a high crystallinity polypropylene.

## Claims

### Claim 1

An oriented film layer including a blend of a crystalline polypropylene wax and a high crystallinity polypropylene homopolymer.

### Claim 2 (depends on 1)

The oriented film layer of claim 1, said crystalline polypropylene wax being a crystalline metallocene catalyzed polypropylene wax.

### Claim 3 (depends on 1)

The oriented film layer of claim 1, including less than 10%, by weight, of the crystalline polypropylene wax.

### Claim 4 (depends on 2)

The oriented film layer of claim 2, wherein said crystalline polypropylene wax is a crystalline metallocene catalyzed polypropylene wax.

### Claim 5 (depends on 1)

The oriented film layer of claim 1, including less than 10%, by weight, of the crystalline polypropylene wax and over 90% of the high crystallinity polypropylene homopolymer.

### Claim 6 (depends on 5)

The oriented film layer of claim 5, said crystalline polypropylene wax being a crystalline metallocene catalyzed polypropylene wax.