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Thermoplastic polyurethane containing structural units of polyester and polyether diols

A thermoplastic polyurethane and structural unit technology, applied in the field of thermoplastic polyurethane, can solve the problems of minimization of water absorption and wet strength, undisclosed TPU's moisture resistance and optical/light transmission properties, etc.

Inactive Publication Date: 2014-05-14
LUBRIZOL ADVANCED MATERIALS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nothing is disclosed about improving the moisture resistance and optical / light transmission properties of these TPU's, and it is always desirable to improve the combination of physical and optical transparency properties of TPU's, including minimizing water absorption and wet strength

Method used

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  • Thermoplastic polyurethane containing structural units of polyester and polyether diols
  • Thermoplastic polyurethane containing structural units of polyester and polyether diols
  • Thermoplastic polyurethane containing structural units of polyester and polyether diols

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0060] Test 1-3

[0061] Store MDI in a refrigerator before use (to minimize dimer formation) and allow to return to room temperature under dry conditions. All other materials were dried in a thermal vacuum oven before use. Laboratory synthesis was performed in a Haake disperser (70 cc mixing tank) and the viscosity of the reaction components was determined using a standard torque measuring device. The stoichiometry strictly followed the MDI equivalent excess a.5%. MDI was added to the mixer and heated to 110°C to melt the MDI. The diol or diol blend and a small amount of catalyst are then slowly added to the MDI with stirring (-40 rpm). The mixer was then heated to 150°C under nitrogen and mixed to complete the prepolymerization between the MDI and diol. At the end of this period, no increase in torque was measured, meaning that the urethane polymer did not undergo significant chain extension. The polymer was obtained by slowly adding the BDO chain extender to the prepo...

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Abstract

The invention relates to a thermoplastic polyurethane containing structural units of polyester and polyether diols. The present invention is a transparent thermoplastic polyurethane (TPU) comprising structural units of: a.) a diisocyanate; b.1) a polyester diol and b.2) a specific polyether diol and c.) a chain extender. The TPU has good combinations of light transmission and clarity, tensile strength, low temperature flexibility, and high moisture vapor transition rates compared to other commercial or known TPUs. A preferred example composition is a TPU that is based on MDI as the diisocyanate monomer, polycaprolactone as a polyester diol, an EO capped EO / PO polyether diol containing less than 20% EO, and butanediol as chain extender. These composition have good combinations of clarity, tensile strength, hydrolytic stability and processability compared to TPUs prepared using either polyester or polyether diols alone or the combination with a higher EO polyether diol.

Description

[0001] This application is a divisional application of the Chinese patent application with the application number 200680036103.7, the application date is September 22, 2006, and the invention title is "thermoplastic polyurethane containing polyester and polyether diol structural units". technical field [0002] The present invention relates to improved thermoplastic polyurethanes (TPU's), preferably elastomeric, preferably transparent, comprising a combination of suitable amounts of polyester diols and polyether diols having a specified ethylene oxide content, having a beneficial combination of physical properties formed structural unit. Background technique [0003] TPU's are prepared by reacting a diisocyanate compound, a polyglycol, and a difunctional chain extender, as is known in the art. In this context, the term TPU also refers to the somewhat less preferred thermoplastic polyurethane urea, or by making diisocyanate "TPUU's" prepared by reacting compounds with amines...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/32A43B13/04
CPCC08G18/10C08G18/4018C08G18/4837C08G18/664C08G18/6674C08G2410/00C08G18/3206
Inventor M·F·索南夏因J·M·考克斯H·R·范德瓦尔B·L·文特
Owner LUBRIZOL ADVANCED MATERIALS INC
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