Ethylene copolymer modified oriented polypropylene

A technology of copolymer and polypropylene, applied in the field of fibers, can solve the problems of physical properties, toughness, elongation at break, etc.

Inactive Publication Date: 2007-03-07
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for conventional polypropylene compositions, higher draw ratios and reduced denier may result in unacceptably lower physical properties such as tensile load at break, tenacity (tensile stress at break) and elongation at break

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] The present invention relates to the enhancement of mechanical properties of stretched polypropylene films and tapes, such as tensile breaking load, tensile modulus, toughness (tensile breaking stress) and elongation at break (%), and relates to the strengthening of melt-spun polypropylene fibers The toughness and elongation at break (%). One or more of these enhancements can be achieved by adding a small percentage (about 0.1-30% by weight or about 1-15% by weight) of an ethylene copolymer such as ethylene / vinyl acetate dimer, ethylene / vinyl acetate tripolymer meta-copolymers, ethylene / alkyl (meth)acrylate dimers, ethylene / alkyl (meth)acrylate terpolymers, functionalized ethylene copolymers, ethylene / acid copolymers and their salts, in combination into polypropylene formulations for the production of films and fibers (the polypropylene formulations may optionally contain other substances selected from fillers such as CaCO 3 and additives such as UV stabilizers, pigmen...

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PUM

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Abstract

The present invention discloses oriented films, tapes and melt-spun fibers prepared from compositions comprising (a) at least one polypropylene polymer; and (b) at least one ethylene copolymer, such as ethylene / acetic acid Vinyl ester dimer, ethylene / vinyl acetate terpolymer, ethylene / alkyl (meth)acrylate dimer, ethylene / alkyl (meth)acrylate terpolymer, functionalized ethylene copolymer compounds, ethylene / acid copolymers and their salts. The films, tapes and fibers exhibit improved tensile properties, such as tensile strength and elongation at break, compared to unmodified polypropylene compositions. Also disclosed are woven, nonwoven, and knitted fabrics prepared from the oriented melt-spun fibers, as well as methods of producing the slit film fibers of the present invention.

Description

[0001] The present invention relates to films, tapes and fibers, which may optionally be oriented, comprising polypropylene and ethylene copolymers; to woven, non-woven and knitted fabrics prepared from said fibers; to the preparation of films, tapes and fibers according to the invention Methods. Background technique [0002] Oriented films comprising polypropylene can be formed from molten polymers by a number of methods known in the art. For example, in cast film extrusion, a flat film may be extruded into a cooling water bath or onto chilled rolls for quenching. Alternatively, in blown film extrusion, a tubular blown film can be extruded through an annular die and air quenched. The film can be oriented in one direction by thermal stretching with a tensioning device and annealing. The film can also be oriented in two directions (machine direction and transverse direction) by means of suitable tensioning devices. Oriented polypropylene film is suitable for a variety of pac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L23/10C08K3/26
CPCC08J2323/10D01D5/42C08J5/18D01F6/46
Inventor L·P·罗兰S·L·萨米尔斯H·T·泰
Owner EI DU PONT DE NEMOURS & CO
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