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Improved flash-spun sheet material

A sheet and filamentary technology, applied in flash spinning, adding pigments to spinning solution, spinning, etc., can solve the problems of insufficient flexibility, excessive weight and volume of printed sheets, etc.

Inactive Publication Date: 2000-04-05
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heavier sheet also makes the printed sheet too heavy and bulky and not flexible enough

Method used

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Examples

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Embodiment

[0045] In the above description and the following non-limiting examples, the following test methods were used to determine the characteristics and properties given. ASTM refers to the American Society for Testing and Materials, and TAPPI refers to the Technical Association of the Pulp and Paper Industries. ISO refers to the International Organization for Standardization, while ANSI refers to the American National Standards Institute.

[0046] Basis weight, determined in accordance with ASTM D-3776 (which method is hereby incorporated by reference) and expressed in g / m 2 is given for the unit. The basis weights given in the following examples are each based on the average of at least 12 measurements made on the sheet.

[0047] The delamination strength of the sheet samples is determined using a constant rate of extension tensile tester, such as an Instron benchtop tensile tester. For a 1.0 inch (2.54 cm) x 8.0 inch (20.32 cm) sample, separation and delamination were induced ...

example 7～12

[0089] In Examples 7-12, the flash-spinning and bonding of polyethylene ultrafine plexifilamentary film fibril sheets was essentially the same as described in Comparative Examples 3-5, except that the polyethylene was mixed with the solvent before Titanium dioxide from Example 1 was added to polyethylene.

[0090] In Examples 7-9, masterbatches were prepared by mixing R104-type neutralized rutile titanium dioxide into the high-density polyethylene in Comparative Examples 3-5 at an incorporation ratio of 50% by weight of the polymer. The masterbatch was obtained under the tradename White HDPE MB 510710 from Ampacet Europe S.A. (Messancy, Belgium) in the form of pellets. This masterbatch was then tumble mixed with the polyethylene of Comparative Examples 3-5 to form a mixture consisting of 96% polyethylene and 4% rutile titanium dioxide. The mixture was added to the spinning medium of Comparative Examples 3-5 in the same ratio as that of Comparative Examples 3-5 to prepare a sp...

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Abstract

There is provided an improved sheet composed of bonded ultrafine plexifilamentary film-fibril bundles spun from polyolefin and pigment. The polyolefin accounts for at least 90% of the weight of the fibril bundle, and the pigment accounts for 0.05-10% of the weight of the fibril bundle. The sheet has high opacity even after bonding to a delamination strength greater than 120 N / m. The pigments in the sheet can be titanium dioxide, black pigments or colored pigments.

Description

field of invention [0001] The present invention relates to sheets made from ultrafine plexifilamentary film-fibril bundles obtained by flash spinning (flash spinning or flash spinning) of polymers. More particularly, the present invention relates to an ultrafine plexifilamentary sheet wherein the physical properties of the sheet are improved by adding a small amount of pigment to the polymer prior to flash spinning. Background of the invention [0002] The technique of flash spinning ultrafine plexifilamentary film-fibrils from polymers in solution or dispersion form is known in the art. The term "ultrafine plexifilamentary" refers to a three-dimensional overall network of many thin ribbon-like film-fibril elements of random length, the average thickness of the elements is less than about 4 μm and the fibril The average value of the width is less than about 25 μm. In ultrafine plexifilamentary structures, the membrane-fibril units are generally coextensi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/46D01D5/11D01F1/04D01F6/04D01F6/06D01F6/30D04H1/72D04H3/00D04H3/16D06F33/00D06F33/02
CPCD01F1/04D01F6/30D01F6/04D01D5/11D04H3/166D01F6/06D04H1/724Y10T442/608Y10T442/642D04H3/16
Inventor D·M·哈尔里斯D·J·麦金蒂S·K·鲁戴斯
Owner EI DU PONT DE NEMOURS & CO
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