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Crosslinkable siloxane-urea copolymers

A technology of copolymers and compositions, applied in the field of diisocyanates, can solve problems such as functional failure and deformation

Inactive Publication Date: 2007-09-19
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that the bond of the adhesive is reversible when the temperature is raised above said softening point
Furthermore, the bonding of moldings or adhesives made from such polymers is prone to cold flow, since hydrogen bonds can continuously separate and reconnect even below the softening point, so deformations and the resulting Failure of required functionality
Accordingly, its field of application is limited to applications where no elevated temperatures and / or no forces are applied to the thermoplastic elastomer

Method used

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  • Crosslinkable siloxane-urea copolymers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0252] 18.3 g of a trimer of 1,6-hexamethylene diisocyanate (commercially available under the trade name Desmodur(R) N3600 from Bayer AG, Germany) were mixed with 3.9 g of hydroxyethyl acrylate and 20 mg of a bismuth compound (available under the name Borchi(R) Kat VP0244 from Borchers GmbH , 40764 Langenfeld, Germany) was stirred at 40° C. for 4 hours in the absence of light. The system was stabilized by adding 1000 ppm of 2,6-di-tert-butyl-4-methylphenol. The properties of the products as monoacrylates and diisocyanates have been tested 13 C NMR spectroscopy was confirmed.

Embodiment 2

[0254] 18.3 g of a trimer of 1,6-hexamethylene diisocyanate (commercially available under the trade name Desmodur(R) N3600 from Bayer, Germany) was mixed with 4.5 g of hydroxyethyl methacrylate and 20 mg of a bismuth compound (under the name Borchi(R) KatVP 0244 from Borchers GmbH, 40764 Langenfeld, Germany) was stirred at 40° C. for 4 hours in the absence of light. The system was stabilized by adding 1000 ppm of 2,6-di-tert-butyl-4-methylphenol. The properties of the products as monoacrylates and diisocyanates have been tested 13 C NMR spectroscopic measurements confirmed.

Embodiment 3

[0256] A trimer of 18.3 g of 1,6-hexamethylene diisocyanate (commercially available under the trade name Desmodur(R) N3600 from Bayer, Germany) was mixed with 6.4 g of 2-(tert-butylamino)ethyl methacrylate in the absence of light Stir at 40°C for 4 hours. The system was stabilized by adding 1000 ppm of 2,6-di-tert-butyl-4-methylphenol. The properties of the products as monoacrylates and diisocyanates have been tested 13 C NMR spectroscopy was confirmed.

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Abstract

The invention relates to diisocyanates comprising radiation-curable groups and organopolysiloxane-polyurea block copolymers of general formula (II), which can be obtained therefrom and can be crosslinked using radiation. In said formula (II), (A) can be identical or different and represents a unit of formula (III), (B) can be identical or different and represents a unit of formula (IV), and (C) can be identical or different and represents a unit of formula (V), the radicals and indices having the meanings indicated in claim 1, provided that at least one radical L is supplied in the molecule while the individual blocks (A), (B), and (C) can be statistically distributed in the polymer.

Description

technical field [0001] The present invention relates to diisocyanates having radiation-crosslinkable groups, to the radiation-crosslinkable organopolysiloxane-polyurea block copolymers obtainable therefrom, and to their use. Background technique [0002] Organopolysiloxane-polyurea segmented copolymers are known and can be prepared, for example, from aminoalkyl-terminated siloxanes and diisocyanates. [0003] The formation of hydrogen bonds between the urea groups allows such polymers to be thermoplastic elastomers; that is, they are plastic above the softening point and below the softening point they have elastic characteristics. Thus, for example, they can be used as hot-melt adhesives. Its disadvantage is that the bond of the adhesive is reversible when the temperature is raised above said softening point. Furthermore, the bonding of moldings or adhesives made from such polymers is prone to cold flow, since hydrogen bonds can continuously separate and reconnect even bel...

Claims

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Application Information

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IPC IPC(8): C08G77/458C08G18/61C08G18/67
CPCC07C265/14C08G18/61C08G77/458C08G18/8175C08G18/792C08G18/67
Inventor 沃尔夫冈·齐凯
Owner WACKER CHEM GMBH