Composition and process for improving heat and weathering stability of segmented polyurethane polymers

A technology of polyurethane and composition, applied in the field of stabilized segmented polyurethane

Inactive Publication Date: 2011-04-20
CIBA SPECIALTY CHEM HLDG INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems with spandex fibers are their heat sensitivity, weatherability for outdoor applications and discoloration under gas fading conditions

Method used

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  • Composition and process for improving heat and weathering stability of segmented polyurethane polymers
  • Composition and process for improving heat and weathering stability of segmented polyurethane polymers
  • Composition and process for improving heat and weathering stability of segmented polyurethane polymers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0054] The following examples illustrate the invention.

[0055] Experimental conditions

[0056] raw material and abbreviation :

[0057] PTMEG is poly(tetramethylene ether) glycol alcohol

[0058] MDI is 4,4-methylene-bis(phenylisocyanate)

[0059] DMAC is N,N-dimethylacetamide,

[0060] Ethylenediamine, diethylamine.

[0061] Preparation of spandex

[0062] PTMEG and MDI were mixed at a ratio of 1.58 moles of MDI per mole of polyether polyol and held at about 60°C for 120 minutes to produce an isocyanate-terminated polyether. The prepolymer was cooled and dissolved in DMAC to give a mixture containing 40% solids. At room temperature, the mixture of ethylenediamine and diethylamine in DMAC was slowly poured into the above mixture, cooled in a water bath and vigorously stirred.

[0063] The resulting segmented polyurethane solution was stirred at 100°C for 5 minutes and had 29% solids.

[0064] A portion of the solution is taken from the bulk polyurethane soluti...

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Abstract

The present invention relates to the stabilization of segmented polyurethanes by the addition of a combination of antioxidants, benzofuranones and or sterically hindered amines and a hydrazine or hydrazide.

Description

technical field [0001] The present invention relates to the stabilization of segmented polyurethanes by addition of antioxidants, benzofuranones and / or mixtures of sterically hindered amines and hydrazines or hydrazides. Background technique [0002] Segmented polyurethane is widely used as a substitute for elastic fibers such as vulcanized rubber. Such fibers are known under the name Spandex fibers (Spandex fibers) (H.G. Elias Makromoleküle, 3 rd edition1975, Hüthig and Wepf, Basel and Heidelberg). The main problems with spandex fibers are their heat sensitivity, weatherability for outdoor applications and discoloration under gas fading conditions. [0003] Therefore, spandex fibers are nowadays stabilized with different stabilizers to improve their properties. A common approach is to stabilize with phenolic antioxidants. Further improvements can be accomplished by adding phenolic antioxidants and benzofuranone type stabilizers, as described for example in Research Disc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/04C08K5/3435C08K5/1535C08K5/24C08K5/13
CPCC08G18/4854C08G18/10C08K5/005C08K5/13C08G18/3228C08L75/08C08L75/04C08K5/1535C08L2666/78
Inventor S·M·陈C·S·戈M·朱奈迪
Owner CIBA SPECIALTY CHEM HLDG INC
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