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Fibers made from copolymers of propylene/alpha-olefins

A technology of interpolymer, propylene, applied in the field of fibers made of propylene/α-olefin interpolymer, which can solve problems such as lack of chlorine resistance

Active Publication Date: 2015-02-25
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These properties, especially the lack of chlorine resistance, can lead to significant disadvantages of spandex in apparel applications such as swimwear and white clothing that need to be washed in the presence of chlorine bleach

Method used

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  • Fibers made from copolymers of propylene/alpha-olefins
  • Fibers made from copolymers of propylene/alpha-olefins
  • Fibers made from copolymers of propylene/alpha-olefins

Examples

Experimental program
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Effect test

preparation example Construction

[0109] where TX is the preparative ATREF elution temperature (preferably expressed in Kelvin) of the i-th fraction, P X is the propylene mole fraction of the i fraction, which can be determined by NMR or IR as described above. P AB is the propylene mole fraction of the overall propylene / α-olefin interpolymer (before fractionation), which can also be determined by NMR or IR. T A and P A is the ATREF elution temperature and propylene mole fraction of the pure "hard segment" (which refers to the crystalline segment of the interpolymer). As a first-order approximation, if the actual value of the "hard segment" cannot be obtained, T A and P A Values ​​are set as those for polypropylene homopolymer.

[0110] T AB for the same composition and with P AB ATREF temperature of random copolymers of propylene mole fraction. T AB It can be calculated by the following equation:

[0111] LnP AB =α / T AB +β

[0112] where α and β are two constants that can be determined by a calib...

Embodiment 1

[0239] A propylene / ethylene block copolymer having a composition of about 12% by weight ethylene and about 88% by weight propylene (soft segment) was melt spun into fine fibers (less than about 4 denier / filament) using a spunbond unit. ), under the conditions of ASTM D 1238, 230°C / 2.16 kg, the melt flow rate (MFR) was measured to be about 25g / 10min, and about 0.877g / cm 3 The overall density, with an estimated hard segment content of about 30% and a soft segment content of about 70%. The melt spinning temperature is about 245° C., the throughput is about 0.5 ghm (gram / minute / hole), and the fiber in the melt is drawn from a spinneret diameter of about 600 microns to each filament from Fiber diameters of about 2 to less than about 4 denier. The resulting nonwoven fabric is then thermally bonded at a temperature of about 200 to 220° C. and a pressure sufficient to point bond the fibers. The mechanical properties of the individual fibers were determined and had a tensile strength...

Embodiment 2

[0241]The propylene / ethylene block copolymer was melt spun into about 40 denier fibers (monofilaments) using a spunbond unit, the copolymer having about 12 wt. % ethylene and about 88 wt. Under the condition of one kilogram, its melt flow rate (MFR) was determined to be about 9g / 10min, and about 0.875g / cm 3 , with an estimated hard segment content of about 30% and a soft segment content of about 70%. The melt spinning temperature was about 245°C, and the fiber was drawn in the melt from a spinneret diameter of about 800 microns to a fiber diameter equivalent to 40 denier at a take-up speed of about 550 m / min. The mechanical properties of this fiber in the form of a spool (before crosslinking) were determined and it had a tensile strength of about 1 to 1.5 g / denier, an elongation at break of 450 to 500%, a permanent set of about 40 to 60% ( 5 cycles at 300% strain, BISFA method) and a melting point of about 160°C.

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Abstract

The invention relates to functionalized interpolymers derived from base olefin interpolymers, which are prepared by polymerizing one or more monomers or mixtures of monomers, such as ethylene and one or more comonomers, to form an interpolymer products having unique physical properties. The functionalized olefin interpolymers contain two or more differing regions or segments (blocks), resulting in unique processing and physical properties.

Description

technical field [0001] The present invention relates to fibers made from propylene / alpha-olefin copolymers, methods of making the fibers, and products made from the fibers. Background technique [0002] Fibers are generally classified according to their diameter. Monofilament fibers are generally defined as having an individual fiber diameter greater than about 15 denier, usually greater than about 30 denier per filament. Fine fibers generally refer to fibers having a diameter of less than about 15 denier per filament. Microdenier fibers are generally defined as fibers having a diameter of less than 100 microns. Fibers can also be classified by their method of manufacture, such as monofilaments, continuously wound fine filaments, rayon or chopped fibers, spunbond fibers, and meltblown fibers. [0003] Fibers with excellent elasticity are needed to make various fabrics, which can then be used to make many durable articles, such as sportswear and upholstery. Elasticity is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/30C08F295/00C08F297/08C08F4/646D04H3/00C08F2/38C08F4/659C08F4/6592C08F10/00C08F110/02C08F210/06C08F210/16D04H3/005
CPCC08F297/08C08F297/083C08F295/00C08F10/00C08F297/086C08F4/659C08L23/10C08F4/65908C08L23/0815C08F2410/01C08F110/02C08F210/16C08F4/65912C08F10/14C08L53/005C08L53/00C08F210/06C08L2205/02D01F6/30C08F4/65904C08L2666/02C08L2666/06C08L2666/04C08F2500/09C08F2500/03C08F2500/12C08F2500/20C08F210/08C08F210/14C08F2500/11C08F2500/21C08L23/16D01F6/46D01F8/06C08J2323/14D10B2321/022
Inventor 彭宏Y-Y.D.齐A·赛恩陈红宇R·M·帕特B·C·波恩Y.W.张赖世耀A·C·常A·K·陶法斯
Owner DOW GLOBAL TECH LLC
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