Thermoplastic polyurethane tape

A thermoplastic polyurethane and isocyanate-based technology, applied in the field of thermoplastic polyurethane belts, can solve the problems of low strength, undisclosed copolymerization ratio, and unrecorded elongation recovery, etc., and achieve good recovery and small residual strain.

Inactive Publication Date: 2010-07-14
ASAHI KASEI FIBERS CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent Document 1 describes the copolymerization of 4.2 mol% neopentyl glycol-based polyether diol, and Patent Document 2 describes the use of 3.4 mol% polyurethane copolymerized polyether diol, but they do not disclose due to the low copolymerization rate. Urethane tape with significantly improved mechanical properties such as strength, elongation, and elastic recovery when formed into a tape or film
In addition, Patent Document 3 describes polyurethane using a copolymerized polyol of THF and 3-alkyltetrahydrofuran, but does not describe the elongation recovery property during stretching and stretching.
In addition, Patent Document 4 describes the improvement of the elastic function of polyurethane copolymerized with 8 to 85 mol% of neopentyl glycol and / or 3-methyl-1,5-pentanediol, but there is no disclosure about thermoplastic polyurethane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] As the polyalkylene ether glycol (ii), PTXG1800 manufactured by ASAHI KASEI FIBERS CORPORATION was used. Copolymerization composition M of PTXG1800 B / (M A +M B ) is 0.1. 1400 g of PTXG and 389.4 g of 4,4'-diphenylmethane diisocyanate were reacted under nitrogen flow at 80° C. for 180 minutes while stirring to obtain a polyurethane prepolymer having isocyanate groups at both ends. Next, this prepolymer was rapidly cooled to 25° C., and 35 g of 1,4-butanediol was added to the prepolymer, followed by stirring for 30 minutes. Polyurethane with a viscosity of 117000 mPa·s (25° C.) was obtained.

[0070] This polyurethane was mixed with 9 g of AO-60 manufactured by ADEKA CORPORATION as an antioxidant and 9 g of LA-36 manufactured by ADEKA CORPORATION as an anti-yellowing agent, and discharged on a Teflon (registered trademark) tray.

[0071] The polyurethane was annealed in a hot-air oven at 130° C. for 3 hours in a state where the polyurethane was loaded on a Teflon (r...

Embodiment 2

[0078]The polyurethane resin powder obtained in Example 1 was melt-extruded and shaped with a twin-screw extruder KZW15TW-45HG manufactured by TECHNOVEL CORPORATION. At a die temperature of 200° C., it was extruded into a film form from a T-die with a width of 150 mm and a lip width of 1.0 mm at an injection rate of 12.4 g / min. It was wound up with a metal roll cooled to 15° C. at a roll speed of 0.5 m / min to obtain a film with a thickness of 250 μm.

[0079] This film was slit and processed to obtain tapes with a width of 6 mm. This tape was fixed with a clip in a 4-fold cold-stretched state, and heat-treated in a hot air oven at 70° C. for 30 minutes.

[0080] The tape had a good residual strain of 18% after 300% elongation at 20°C. The stress at 100% elongation of this tape was 4.02 MPa.

Embodiment 3

[0090] The polyurethane resin powder prepared in Example 1 was melt-extruded and shaped with a 50 mmφ single-screw extruder. At a die temperature of 200° C., it was extruded into a strip form at an injection rate of 80 g / min from a slot die having a width of 30 mm and a thickness of 0.2 mm. It is wound on a metal roll cooled to 15° C., and taken up at a roll speed of 30 m / min and a take-up speed of 120 m / min. A tape with a thickness of 110 μm was obtained.

[0091] The tape had a good residual strain of 25% after 300% elongation at 20°C. In addition, the recovery rate after repeating the 300% elongation recovery at -10°C three times was good at 90%.

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Abstract

The object is to provide a thermoplastic polyurethane tape having an excellent elasticity function. The polyurethane tape is a thermoplastic polyurethane tape characterized by having a residual strain of 5 to 40% after stretching by 300% at 20 DEG C, preferably having a rate of recovery of 85% or higher after repeating the 300%-stretching / recovery cycle three times at -10 DEG C.

Description

technical field [0001] The present invention relates to thermoplastic polyurethane tapes with good elastic properties. Background technique [0002] Urethane belts are thinner and lighter than rubber, but have the same strength as rubber, excellent wear resistance, etc., and have excellent stretch characteristics. In addition, they have better weather resistance and oil resistance than rubber, so they are widely used in interior belts. Shirt material, outerwear material, sports material and clothing material, etc. [0003] However, further improvements are expected for various elastic functions. For example, it is used in sportswear such as underwear, tights, swimsuits and tights, T-shirts or polo shirts, etc., or in place of cotton and braid, to suppress the shoulders of knitted (cut sew) When it is loose and used as a reinforcing material for cloth, there is a problem that unevenness remains in the cloth after taking off the clothes because the recovery property is poor ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08G18/48
CPCC08G18/10C08J5/18C08J2375/08C08G18/4858C08G18/3206C08G18/48C08L75/04
Inventor 吉田晓小岛润一
Owner ASAHI KASEI FIBERS CORPORATION
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