Linear polyethylene shrink films

Patent 4532189 Issued on July 30, 1985. Estimated Expiration Date:

November 18, 2003. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3212635

3524795

3595735

Process for the production of high impact compositions of polyethylene and polypropylene block copolymers
Patent #: 3937758
Issued on: 02/10/1976
Inventor: Castagna

Hydrocarbon interpolymer compositions
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Coextruded heat sealable laminar thermoplastic films
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Patent #: 4151318
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Flexible packaging films of high density polyethylene capable of forming easily openable heatseals
Patent #: 4188441
Issued on: 02/12/1980
Inventor: Cook

Multi-layer polyolefin shrink film
Patent #: 4194039
Issued on: 03/18/1980
Inventor: Mueller

Composition for write-on key tag and sticker
Patent #: 4199638
Issued on: 04/22/1980
Inventor: McKee

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Inventor

Mueller, Walter B.

Assignee

W. R. Grace & Co., Cryovac Div.

Application

No. 06/553230 filed on 11/18/1983

US Classes:

428/516, Monoolefin polymer264/171.28, Polyamide (e.g., nylon,, etc.) or addition polymer of at least one monoethylenically unsaturated monomer (e.g., polyethylene, polypropylene, polystyrene, etc.) containing layer428/347, Heat sealable428/451, Next to addition polymer from unsaturated monomers, or aldehyde or ketone condensation product428/518, Next to vinyl or vinylidene chloride polymer428/520, Ester, halide or nitrile of addition polymer428/910, PRODUCT WITH MOLECULAR ORIENTATION428/913MATERIAL DESIGNED TO BE RESPONSIVE TO TEMPERATURE, LIGHT, MOISTURE, ETC.

Examiners

Primary: Ives, Patricia C.

Attorney, Agent or Firm

International Classes

B32B 27/32 (20060101)
G02B 6/44 (20060101)

Abstract

A multi-layered thermoplastic film having improved physical characteristics is formulated through utilization of a linear low density polyethylene or linear medium density polyethylene resin as a core and/or an intermediate layer constituent.