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Polyurethane elastomers comprising allophanate modified isocyanates

A technology of polyurethane elastomer and allophanate, applied in the field of polyurethane elastomer, can solve problems such as no working example

Inactive Publication Date: 2008-12-10
BAYER MATERIALSCIENCE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While various patents generally disclose cycloaliphatic isocyanates in a long list of isocyanates described as being suitable for the RIM process, few patents mention any working examples using cycloaliphatic isocyanates

Method used

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  • Polyurethane elastomers comprising allophanate modified isocyanates
  • Polyurethane elastomers comprising allophanate modified isocyanates
  • Polyurethane elastomers comprising allophanate modified isocyanates

Examples

Experimental program
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Effect test

Embodiment

[0087] Isocyanate A: An allophanate based on IPDI and isobutanol was prepared by mixing 15740 grams (142 equivalents) of IPDI with 971 grams (13 equivalents) of isobutanol. The resulting allophanate contained 30.55% NCO. A prepolymer of allophanate was prepared by mixing 16720 grams (103 equivalents) of the above allophanate with 1091 grams (4.3 equivalents) of trimethylolpropane. The NCO group content of the obtained prepolymer was 25.9% by weight.

[0088] Polyol A: Polyether polyol with a nominal functionality of about 3, a molecular weight of about 6000, an OH value of about 28, and a maximum unsaturation content of about 0.005 meq / g. The polyether polyol comprises the reaction product of glycerol and propylene oxide, contains about 20% EO capping, and is prepared in the presence of a double metal cyanide catalyst.

[0089] Polyol B: Crosslinking agent, functionality about 4, molecular weight about 350, OH value about 630, including propoxylated products of ethylen...

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Abstract

This invention relates to polyurethane elastomers and to a process for their production. These elastomers comprise the reaction product of a polyisocyanate component comprising an allophanate modified (cyclo)aliphatic polyisocyanate which has an NCO group content of about 15 to about 35% or a prepolymer thereof, with an isocyanate-reactive component comprising a low unsaturation polyether polyols, a low molecular weight organic compound containing two hydroxyl groups and which is free of amine groups, and, optionally, one or more organic compounds having a molecular weight of about 200 to about 500, a hydroxyl functionality of 3 to 4 and comprising an amine-initiated polyether polyol.

Description

Background of the invention [0001] The present invention relates to a polyurethane elastomer with improved weather resistance and a production method thereof. [0002] The production of polyurethane molded articles by reaction injection molding (ie RIM) technology is well known and described, for example, in US Patent 4,218,543. The RIM method involves a mold-filling technique by which highly active liquid starting components are mixed in a very short time using high-output, high-pressure metering equipment after they have been mixed in a so-called "fully controlled mixing head" Inject into the mold. [0003] In the production of polyurethane moldings by the RIM process, the reaction mixture generally comprises a part A based on a polyisocyanate and a part B based on an organic compound containing isocyanate-active hydrogen atoms, and suitable chain extenders, catalysts, Foaming agents and other additives. Polyisocyanates suitable for commercial RIM processes are aromatic i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/18C08G18/20C08G18/48C08G18/78
CPCC08G18/10C08G18/1858C08G18/2063C08G18/4866C08G18/7837C08G18/6674C08G18/18C08G18/48C08G18/78
Inventor S·J·哈拉辛R·R·罗斯勒C·L·金尼R·V·斯塔彻J·T·加勒特
Owner BAYER MATERIALSCIENCE AG
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