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Polyester Prepolymers

Inactive Publication Date: 2008-11-27
COVESTRO DEUTSCHLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]The object of the present invention was now to provide polyester-based, silane-curing polyurethanes which exhibit a sufficiently low viscosity, can be processed at ambient temperature and, when cured, achieve high cohesive strength with, at the same time, sufficiently high extensibility, which permits structural bonding.

Problems solved by technology

However, all these systems based on polyether polyols form flexible polymers with relatively low strength after curing, which are less suitable e.g. for structural bonding.
In this case, however, the isocyanate used is TMXDI, which is accessible only with difficulty and is therefore expensive.

Method used

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  • Polyester Prepolymers
  • Polyester Prepolymers
  • Polyester Prepolymers

Examples

Experimental program
Comparison scheme
Effect test

example 1 (

According to the Invention)

[0065]In a 5 l sulfonating beaker with a lid, stirrer, thermometer and nitrogen flow, 0.6 g dibutyltin dilaurate (Desmorapid Z®, Bayer MaterialScience AG, Leverkusen, Del.) were added to 2197.92 g of the polyester diol A and the mixture was heated to 60° C. 814.3 g isocyanatopropyltrimethoxysilane (Geniosil® GF40, Wacker AG, Burghausen) were then added dropwise over three hours and stirring was continued until an NCO content could no longer be detected by titration. The alkoxysilyl end group-containing polyurethane prepolymer obtained had a viscosity of 6,450 mPas (23° C.).

example 2 (

According to the Invention)

[0066]In a 10 l reactor with a lid, stirrer, thermometer and nitrogen flow, 0.5 g dibutyltin dilaurate (Desmorapid Z®, Bayer MaterialScience AG, Leverkusen, Del.) were added to 4470.2 g of the polyester diol B and the mixture was heated to 60° C. 529.3 g isocyanatopropyltrimethoxysilane (Geniosil® GF40, Wacker AG, Burghausen) were then added dropwise over half an hour and stirring was continued until an NCO content could no longer be detected by titration. The alkoxysilyl end group-containing polyurethane prepolymer obtained had a viscosity of 90,500 mPas (23° C.).

example 3 (

According to the Invention)

[0067]In a 5 l sulfonating beaker with a lid, stirrer, thermometer and nitrogen flow, 0.2 g dibutyltin dilaurate (Desmorapid® Z, Bayer MaterialScience AG, Leverkusen, Del.) were added to 2387.2 g of the polyester diol A and the mixture was heated to 60° C. Next, 117.6 g hexamethylene diisocyanate (Desmodur H®, Bayer MaterialScience AG, Leverkusen, Del.) were added first over half an hour and 557.1 g isocyanatopropyltrimethoxysilane (Geniosil® GF40, Wacker AG, Burghausen) were then added dropwise over an hour and stirring was continued until an NCO content could no longer be detected by titration. The alkoxysilyl end group-containing polyurethane prepolymer obtained had a viscosity of 25,100 mPas (23° C.).

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Abstract

The invention relates to prepolymers containing alkoxysilane groups based on special, low-viscosity polyester polyols, which exhibit particularly high tensile strength, a process for the production thereof and their use as a binder for adhesives, primers or coatings.

Description

RELATED APPLICATION[0001]This application claims benefit to German Patent Application No. 102007023197.2 filed May 22, 2007 the disclosure of which is incorporated by reference in its entirety.FIELD OF THE INVENTION[0002]The present invention relates to prepolymers containing alkoxysilane groups based on special, low-viscosity polyester polyols, which exhibit particularly high strength, a process for the production thereof and their application as a binder for adhesives, primers or coatings.BACKGROUND AND PRIOR ART[0003]Alkoxysilane-functional polyurethanes which cure via silane polycondensation have long been known. A review article on this topic can be found e.g. in “Adhesives Age” April 1995, pages 30 ff. (authors: Ta-Min Feng, B. A. Waldmann). Single-component polyurethanes of this type, which contain terminal alkoxysilane groups and which cure under the effect of moisture, are increasingly being used as flexible coating, sealing and adhesive compositions in the building trade a...

Claims

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Application Information

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IPC IPC(8): C08G71/04
CPCC08G18/10C08G18/3821C08G18/4241C08G18/718C09J175/06C08G18/289C08G18/00C08G18/42C08G18/61C08G18/83
Inventor LUDEWIG, MICHAELMATNER, MATHIAS
Owner COVESTRO DEUTSCHLAND AG
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