Polyurethane/urea for producing spandex and its production method

A polyurethane, prepolymer technology, applied in the field of spandex elastic fibers, can solve the problem of not providing

Inactive Publication Date: 2003-12-17
BAYER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] U.S. Patent 5,340,902 discloses that unsaturation levels below 0.03 meq/g are advantageous in the production of spandex, but does not pr

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] 1340 gm of polyol A, 987 gm of polyol B and 139.2 gm of polyol C were mixed and dehydrated in vacuo at 120°C for 1 hour. After cooling to room temperature, 50 ppm of ZNO was mixed into the polyol blend. 508.7 g of MDI were added at 55°C. The reaction mixture was heated at 80° C. for 110 minutes until the NCO content of the prepolymer was 2.04%.

[0085] At 60°C, 1275.6 gm of DMAc was added to the prepolymer and the mixture was cooled to 25°C. The homogenized mixture of prepolymer and DMAc had an NCO content of 1.40%. With rapid mixing, 14.96 gm of EDA, 7.80 gm of IPDA, 1.56 gm of DEA and 2331 gm of DMAc were added to 1706 gm of the diluted prepolymer. After one hour of mixing, the resulting solution had a viscosity of 61 Pa.s. An additional 64 gm of the diluted prepolymer was added and mixed for 30 minutes. At this point, the viscosity of the solution is 72 Pa.s.

[0086] To this viscous polymer solution was added 0.3% by weight of magnesium stearate, 2.0% by weig...

Embodiment 2-3

[0089] The procedure of Example 1 was repeated using the starting materials listed in Table 1 in the relative amounts listed in Table 1 . The properties of each polymer solution and fibers made from these solutions are listed in Table 1.

[0090] Example

[0091] 1 Actual Strength = strength based on actual denier at break.

Embodiment 4-5

[0095] The procedure of Example 1 was repeated using the starting materials listed in Table 2 in the relative amounts listed in Table 2. The properties of the prepolymers and fibers produced from those prepolymers are also listed in Table 2.

[0096] Example

4

5

Equivalent %, Polyol D

20.6

20.6

% by weight, polyol D

45.6

45.6

Equivalent %, Polyol B

44.9

44.9

% by weight, polyol B

49.7

49.7

Equivalent %, Polyol C

34.5

34.5

% by weight, polyol C

4.7

4.7

Overall molecular weight of the blend (Da)

1800

1800

NCO:OH

1.8

1.8

Prepolymer viscosity Pa·s

(50°C)

21.1

21.1

prepolymer catalyst

50ppm ZNO

50ppm ZNO

EDA, mol%

82.5

97.5

IPDA, mol%

15

0

DEA, mol%

2.5

2.5

...

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PUM

PropertyMeasurementUnit
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Abstract

Segmented polyurethane/ureas useful for the production of spandex are produced by chain extending, in the presence of a solvent, an isocyanate-terminated prepolymer prepared by reacting a stoichiometric excess of an isocyanate with an isocyanate-reactive component which includes: (1) from about 5 to about 30 equivalent percent of a polyoxypropylene diol having a molecular weight of at least 1500 Da and an unsaturation level less than or equal to 0.03 meq/g; (2) from about 20 to about 60 equivalent percent of a polytetramethylene ether glycol having a molecular weight less than 1000 Da; and (3) from about 25 to about 65 equivalent percent of a polytetramethylene ether glycol having a molecular weight greater than or equal to 1000 Da.

Description

technical field [0001] The present invention relates to segmented polyurethane / urea, which has excellent elastic, mechanical and thermal properties, to fibers made of such polyurethane / urea and to the production process of such polyurethane / urea and fiber. More specifically, the present invention relates to polyurethane / urea and spandex fibers produced by chain extension of isocyanate-terminated prepolymers in the presence of solvents. The isocyanate-terminated prepolymers are derived from isocyanate-reactive components comprising high molecular weight polytetramethylene ether glycol (PTMEG), low molecular weight PTMEG and up to 30 equivalents based on total isocyanate-reactive components % of low unsaturation, high molecular weight polyoxyalkylene glycols. Background technique [0002] Polyurethane / urea in the form of fibers and films has been widely used in the textile industry. The term "spandex" is commonly used to describe these polyurethaneureas, which are long-chain...

Claims

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Application Information

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IPC IPC(8): C08G18/12C08G18/22C08G18/32C08G18/48D01F6/70
CPCC08G18/4854C08G18/222D01F6/70C08G18/4866C08G18/4808C08G18/12Y10S528/906C08G18/3234C08G18/48
Inventor B·D·劳里
Owner BAYER CORP
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