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Aliphatic thermoplastic polyurethane and its application

A polyurethane, thermoplastic molding technology, applied in the field of compositions containing aliphatic polyurethane, can solve problems such as thermal instability

Inactive Publication Date: 2002-10-23
BAYER AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0063] However, the TPU comparison sample is either very tear-resistant, so it cannot be used as a mask such as an airbag, especially as an invisible integral component of the instrument panel, or it is less stable to heat (Comparison 4)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0022] The TPU of the present invention can be prepared by different methods, which are equally applicable.

[0023] TPUs according to the invention based on two different aliphatic diisocyanates "A1" (HDI) and "A2" (aliphatic diisocyanates other than HDI) can be prepared, for example, by reaction processes leading to TPU "A1-2". But it is also possible to prepare TPU "A1" based on aliphatic diisocyanate "A1" in a known manner, and then prepare TPU "A2" based on aliphatic diisocyanate "A2" separately, and the remaining components B to E are not added. changed. Finally, TPU "A1" and TPU "A2" are mixed together in a known manner and in the desired proportions to form TPU "A1-2" (for example, using an extruder or kneader).

[0024] The inventive TPUs based on polyol mixtures can be produced analogously by using polyol mixtures (polyol B1 and polyol B2), for example in a mixing unit, in a reaction process leading to TPU "B1-2". Second, it is also possible to prepare TPU "B1" bas...

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PUM

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Abstract

Flexible thermoplastic polyurethane comprises: <??>(A) hexamethylenedi-isocyanate; <??>(B) polyoxypropylene glycol, polyoxyethylene glycol and / or poly-(oxypropylene / oxyethylene) glycol with a mol. wt. of 2500-10000; and <??>(C) chain extenders with a molecular weight of 60-500. <??>Flexible thermoplastic polyurethane (I) comprises: <??>(A) mixture of (mol%) hexamethylenedi-isocyanate (HDI) (100-70) and other aliphatic di-isocyanates (0-30); <??>(B) mixture of (b1) polyoxypropylene glycol, polyoxyethylene glycol and / or copolyoxyalkylene diols based on propylene oxide and ethylene oxide (100-70), with a number-average molecular weight (Mn) of 2500-10000 and (b2) other polyols (0-30) with an Mn of 600-10000; <??>(C) chain extenders with an Mn of 60-500; <??>(D) catalysts (optionally); and <??>(E) additives (optionally). <??>These components are reacted with a ratio of (A):(B) = (1.5:1)-(30:1) and an NCO index of 95-105. <??>An Independent claim is also included for flexible molded products made from (I).

Description

technical field [0001] The present invention relates to thermoplastic molding compositions and more particularly to compositions containing aliphatic polyurethanes. Summary of the invention [0002] A soft (70-90 Shore A hardness) aliphatic thermoplastic polyurethane (TPU) is disclosed. The TPU of the present invention is characterized in that it has reduced mechanical strength combined with a high heat deflection temperature and a high melting point. Background technique [0003] Since aromatic thermoplastic polyurethanes (aromatic TPUs) are formed from aromatic diisocyanates, they are not lightfast. When producing moldings of a specific color, severe yellowing occurs due to exposure to light, and even black moldings have varying degrees of color and luster. [0004] The use of aliphatic thermoplastic polyurethanes (TPU) in automotive interior equipment, for example in dashboard panels, is already known (eg DE-C 42 03 307). Of course, it is desirable to obtain a unifor...

Claims

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Application Information

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IPC IPC(8): C08J5/00C08G18/48C08G18/66C08G18/73C08G71/04
CPCC08G18/6674C08G18/73C08G71/04
Inventor W·考夫霍德H·佩尔林斯H·G·霍佩W·雷里
Owner BAYER AG
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