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Method for preparing a thermoplastic polyurethane having a low glass transition temperature

A thermoplastic polyurethane, caprolactone technology, applied in the field of thermoplastic polyurethane, can solve the problems of impairing cold flexibility, unsatisfactory mechanical properties, indivisibility, etc.

Pending Publication Date: 2020-07-24
BASF SE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Existing methods of preparing TPU and TPU itself have not documented soft phase crystallization which impairs cold flexibility at low temperatures
Additionally, the unsatisfactory mechanical properties associated with these TPUs (especially at very low T g value below) indivisible

Method used

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  • Method for preparing a thermoplastic polyurethane having a low glass transition temperature
  • Method for preparing a thermoplastic polyurethane having a low glass transition temperature
  • Method for preparing a thermoplastic polyurethane having a low glass transition temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0315] Examples and Comparative Examples

[0316] 1. Compound

[0317] Polyester polyol

[0318]

[0319] Polyisocyanate - 4,4'-MDI from BASF with an isocyanate content of 33.5% by weight.

[0320] low molecular weight diols

[0321] CE 1 1,6-Hexanediol

[0322] CE 2 1,4-Butanediol

[0323] Obtained from Sigma Aldrich

[0324] additive

[0325] AD 1 Phenolic antioxidant stabilizer purchased from BASF

[0326] 2. Standard method

[0327]

[0328] For T determined by dynamic mechanical thermal analysis according to DIN EN ISO 6721-1:2011-08 g , all values ​​given in this application were determined at a heating rate of 2 K / min and in 1 Hz torsional mode. Unlike the DIN specification, the temperature was adjusted in steps of 5 K with 35 s steps, which corresponds to a continuous heating rate of 2 K / min. Tests were carried out with samples having a width:thickness ratio of 1:6.

[0329] 3. Conventional TPU synthesis

[0330] In a 3.5 liter metal vessel, the polyo...

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Abstract

The present invention is directed to a method for preparing a thermoplastic polyurethane having a low glass transition temperature. The process according to the present invention comprises the steps of providing at least one polyol composition (P) comprising a poly-Epsilon-caprolactone polyol (P1), and a second polyol (P2) which is different from the first polyol (P1), and reacting the at least one polyol composition (P) with at least one polyisocyanate (P1) and at least one low molecular weight diol (CE) optionally in the presence of at least one catalyst (CA) and / or at least one additive (AD) to obtain a thermoplastic polyurethane. The present invention is also directed to the thermoplastic polyurethane obtained according to the process of the prestn invention and the use thereof in extruded articles and injection molded articles.

Description

[0001] The present invention relates to a process for the preparation of thermoplastic polyurethanes having a low glass transition temperature Background technique [0002] Polyurethanes are extremely important industrially due to their excellent mechanical properties and ability to be prepared at low cost. Their mechanical properties can be varied widely by using components of different chemical structures. The growth of thermoplastic polyurethanes relies heavily on cheap and available raw materials - polyisocyanates, polyols and chain extenders. [0003] Polyurethane elastomers are divided into castable polyurethane, grindable polyurethane and thermoplastic polyurethane. Castable and thermoplastic polyurethanes are known as representative examples of block elastomers such as thermoplastic elastomers, and have rubber elasticity and abrasion resistance as well as strength. [0004] Polyols are the largest volume raw materials used in thermoplastic polyurethane applications. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/76C08G18/32C08G18/42
CPCC08G18/664C08G18/7671C08G18/3203C08G18/4244C08G18/4277C08G2110/0058C08G2110/0066C08J9/16C08J2375/04C08J9/125C08J9/18C08J2203/10
Inventor J·波彭伯格S·里克特E·波瑟尔特
Owner BASF SE
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