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Low haze thermoplastic polyurethane using co-chain extenders

A technology of thermoplastic polyurethane and chain extender, which is applied in transportation and packaging, thin material processing, etc.

Active Publication Date: 2011-04-06
LUBRIZOL ADVANCED MATERIALS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there has been little disclosure in the past about improving the transparency of these TPUs

Method used

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  • Low haze thermoplastic polyurethane using co-chain extenders

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0054] Indicative levels of feedstock were provided from tanks using tubes, pumps, and flow meters to control flow and provide the proper ratio to the feed port of the extruder.

[0055] The diisocyanate was MDI, 4,4'-diphenylmethane diisocyanate, available as ISONATE 125MMDI (trademark of The Dow Chemical Company).

[0056] The diol used in this experiment is polycaprolactone diol, purchased from Dow Chemical Company (The DowChemical Company), prepared by the reaction of e-caprolactone, using 1,4 butanediol as initiator, and having Molecular weight of 2,000.

[0057] BDO is 1,4-butanediol obtained from BASF Corporation.

[0058] The second linear chain extender was PDO, 1,3-propanediol (99.7%), available from the Shell Chemical Company.

[0059] The cyclic chain extender, CHDM, was 1,4-cyclohexanedimethanol, available as CHDM-D from the Eastman Chemical Company.

[0060] The catalyst was stannous octoate (Dabco T-9 from Air Products & Chemicals, Inc) and was used at a leve...

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Abstract

The present invention is a low haze thermoplastic polyurethane (TPU) comprising structural units of a diisocyanate; a diol and three different chain extenders (butanediol chain extender; a different linear diol co-chain-extender and a cyclic co-chain-extender). The TPU has good combinations of light transmission and clarity, low temperature flexibility, and high moisture vapor transition rates compared to other commercial or known TPUs. The preferred composition is a TPU that is based on polycaprolactone as diol, MDI as the diisocyanate monomer, butanediol chain extender, 1,3 propanediol linear chain co- extender and cyclohexanedimethanol cyclic chain co-extenders, and has good clarity and tensile strength.

Description

[0001] This application claims the benefit of US Provisional Application No. 60 / 748,720, filed December 9, 2005. technical field [0002] The present invention relates to low haze thermoplastic polyurethanes (TPU) based on the combination of three different chain extender structural units. Background technique [0003] It is well known in the art that TPU is prepared by reacting a diisocyanate compound, a polymeric diol, and a difunctional chain extender. In this context, unless otherwise expressly defined or limited by context to urethane products that are merely diols with chain extenders having only hydroxyl-reactive moieties, the term TPU also refers A chain extender compound reaction, or a thermoplastic polyurethane urea, or "TPUU," prepared by reacting a diisocyanate compound with a hydroxyl-containing chain extender compound and an amine. [0004] Polyester diols are known to provide highly desirable TPUs with good physical properties, hardness and abrasion resistanc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/32C08G18/65
CPCC08G18/0895C08G18/664C08G18/4277C08G18/7671C08G18/088C08G18/3212Y10T428/31547
Inventor H·法拉F·小莱尔马
Owner LUBRIZOL ADVANCED MATERIALS INC
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