Film and method of making film

A technology of blown film and cast film, applied in the field of film and its manufacture

Inactive Publication Date: 2008-09-17
MILLIKEN & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Film and method of making film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Calcium HHPA in LLDPE

[0054] To a linear low density polyethylene (LLDPE) common in the film industry with a density of 0.917 g / cm3 was applied 1000 ppm of the following mixture of HHPA calcium compounds:

[0055]

[0056] Also add above-mentioned compound and standard stabilizing package (500ppm 1010, 1000ppm Irgafos 168 and 800ppm zinc stearate). The resulting mixture was physically mixed, twin-screw compounded, and pelletized. The resulting composite resin was then fabricated into films with a thickness of 25 microns using standard blown film processes at a blow-up ratio of 2.5. The resulting film has the following properties:

[0057] Table I. Physical properties of LLDPE blown film

[0058] sample

yield stress

(psi)

breaking stress

(psi)

%Elongation

@break

1% Secant Die

Volume (psi)

Elmendorf

tear (g)

Falling Dart

strike (g)

ASTM

method

D882

D882

...

Embodiment 2

[0062] Example 2: Calcium HHPA in MDPE

[0063] Apply 1000ppm calcium HHPA and standard stabilization pack (500ppm 1010, 1000ppm Irgafos 168 and 800ppm zinc stearate). The resulting mixture was physically mixed, twin-screw compounded, and pelletized. The resulting composite resin was then fabricated into films with a thickness of 25 microns using standard blown film processes at a blow-up ratio of approximately 2.5.

[0064] The resulting film has the following properties:

[0065] Table III. Physical properties of MDPE blown film

[0066] sample

yield stress

(psi)

breaking stress

(psi)

%Elongation

@break

1% Secant Die

Volume (psi)

Elmendorf

tear (g)

Falling Dart

strike (g)

ASTM

method

D882

D882

D882

D882

D1922

D1709

control

2394 / 2466

3580 / 3027

476 / 589

45.2 / 48.3

43 / 331

76

Clarified

...

Embodiment 3

[0071] Calcium HHPA in various types of polyethylene

[0072] Add 1000ppm HHPA calcium to several types of polyethylene (PE) and standard stabilization packs (500ppm 1010, 1000ppm Irgafos 168 and 800ppm zinc stearate). The resulting mixture was physically mixed, single-screw compounded, and pelletized. The resulting composite resin was then fabricated into films with a thickness of 50 microns using standard blown film processes at a blow-up ratio of approximately 2.0. The resulting film has the following optical properties:

[0073] Table V. Optical properties of PE with different comonomer types and catalysts

[0074] resin

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Abstract

A film article comprising a polyethylene polymer or copolymer and a cycloaliphatic metal salt is disclosed. A method of making a blown and a cast polyethylene film is shown. The film may also include various additives that are employed to improve the properties of the film, including stearate-containing compounds. Additives employed in one embodiment of the invention may reduce the percent haze of film formed in the process, thereby providing desirably low levels of haze. Zinc stearate is one additive that can be employed in making a low haze polyethylene film.

Description

technical field Background technique [0001] Polymer compositions can be melted to make a wide variety of articles. These articles may include films, fibers and tubes. A variety of polymer processing techniques are known, including extrusion, blow molding, molding, compression, and injection, in which molten polymer is cooled and shaped into solids. Each process has its own specific physical and chemical effects on the polymer. Furthermore, each process can be tailored to achieve exactly the desired properties from the polymer using the minimum amount of energy and at the maximum production rate. Often, the use of one compound or formulation in one type of polymer processing technique does not predict that the same formulation can be used successfully in another type of processing technique. Extensive trial and error is required to determine whether a particular formulation is suitable for a particular type of polymer process. [0002] Thermoplastic compositions must exhi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K5/098C08K5/00C08J5/18
CPCC08K5/098C08J5/18C08J2323/04C08L23/04C08K5/00
Inventor W·S·兰伯特S·沃尔特斯L·里特D·L·多森P·范赫克C·S·克舍尔
Owner MILLIKEN & CO
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