Dimer fatty acid-polyester diol-based polymer, containing isocyanate groups

A technology of isocyanate group and diisocyanate, which is applied in the field of isocyanate group-containing polymers based on dimer fatty acid polyester diol, can solve the problems of complex preparation, poor extrudability, high viscosity, etc.

Pending Publication Date: 2021-08-31
SIKA TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction product is extremely viscous and complex to prepare
Due to poor extrudability, it is not suitable for adhesives that can be applied at room temperature and does not achieve the desired adhesion on residual adhesive bead

Method used

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  • Dimer fatty acid-polyester diol-based polymer, containing isocyanate groups
  • Dimer fatty acid-polyester diol-based polymer, containing isocyanate groups
  • Dimer fatty acid-polyester diol-based polymer, containing isocyanate groups

Examples

Experimental program
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Embodiment

[0183] Examples are described below, which explain the present invention in more detail. The invention is of course not limited to the described embodiments.

[0184] "Normal climate" (NK) means a temperature of 23±1° C. and a relative air humidity of 50±5%.

[0185] Chemicals used were from Sigma-Aldrich Chemie GmbH if not stated otherwise.

[0186] Polyols used:

[0187] 1837: Amorphous polyester diol based on dimerized fatty acids, OH number 110 mg KOH / g, liquid at room temperature (from Croda)

[0188] 1838: Amorphous polyester diol based on dimerized fatty acids, OH number 56 mg KOH / g, liquid at room temperature (from Croda)

[0189] 3196: Amorphous polyester diol based on dimerized fatty acids, OH number 37 mg KOH / g, liquid at room temperature (from Croda)

[0190] 3197: Amorphous polyester diol based on dimerized fatty acids, OH number 56 mg KOH / g, liquid at room temperature (from Croda)

[0191] 5031BT: Ethylene oxide-terminated polyoxypropylene triol s...

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Abstract

The present invention relates to a polyester urethane polymer containing isocyanate groups and being liquid at ambient temperature, obtained by reacting at least one monomeric diisocyanate and a dimer fatty acid-based polyester diol having an OH-number ranging between 28 and 120 mg KOH / g in a NCO / OH ratio of at least 3 / 1, and by subsequently removing a large part of the monomeric diisocyanate by means of a suitable separation process, characterised in that said polymer has an NCO content ranging between 1.5 and 6 % by wt. and a maximum monomeric diisocyanate content of 0.5 % by wt. The invention also relates to the use of said polymer as an adhesion promoter and to moisture-curing polyurethane compositions containing said polymer. The polymer according to the invention is easy to use. It permits the production of moisture-curing polyurethane compositions for application in ambient temperatures, having improved properties in terms of open time, adhesion, application and weather resistance, with unchanged good properties of storage stability, curing rate, strength, ductility, elasticity and hazardous material classification. Compositions of this type are particularly suitable for use as elastic adhesives in replacement glass for vehicles.

Description

technical field [0001] The present invention relates to isocyanate group-containing polymers having a low monomer content and their use in moisture-curing polyurethane compositions, in particular as adhesives for vehicle glass replacement. Background technique [0002] Polyurethane-based curable compositions are often used as adhesives, for example in vehicle construction, to achieve elastic bonds. Good properties are required for this, especially with regard to storage stability, applicability, open time, curing speed, adhesion, strength, elasticity, weather resistance and hazardous substance classification. [0003] One-component moisture-curing systems are popular, especially because of their ease of handling. In general, such systems show good adhesive properties. But when applied to certain substrates, good adhesion can be difficult to achieve. An example of this is the bonding of replacement glass in vehicles, where the body flange as substrate not only includes are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/48C08G18/76C08K3/04C08K3/26C08G18/10C08K5/103C08G18/42C09J175/04C08G18/75
CPCC08G18/10C08G18/4233C08G18/4238C08G18/4825C08G18/4841C08G18/755C08G18/7671C08K3/04C08K5/103C08K2003/265C09J175/04C08K5/0016C08G18/307C08K3/26C08G2170/00C08G2190/00C08L75/06
Inventor S·雷曼N·库比M·施伦普夫
Owner SIKA TECH AG
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