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Isocyanate-group-containing polymer having a low content of monomeric diisocyanates

A diisocyanate, isocyanate-based technology, applied in the direction of polyurea/polyurethane adhesive, bonding method, adhesive type, etc., to achieve the effect of good creep resistance, good leveling, high tear propagation resistance

Pending Publication Date: 2021-03-23
SIKA TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This polymer is in principle suitable as a basis for one-component elastic polyurethane sealants and adhesives, but the products obtained from it still need to be improved with regard to stretchability and tear propagation resistance

Method used

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  • Isocyanate-group-containing polymer having a low content of monomeric diisocyanates
  • Isocyanate-group-containing polymer having a low content of monomeric diisocyanates
  • Isocyanate-group-containing polymer having a low content of monomeric diisocyanates

Examples

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Embodiment

[0176] Examples are described below, which explain the present invention in more detail. The invention is of course not limited to the described embodiments.

[0177] "Normal climate" ("NK") means a temperature of 23±1° C. and a relative air humidity of 50±5%.

[0178] Chemical reagents used were obtained from Sigma-Aldrich if not stated otherwise.

[0179] Polyols used:

[0180] 5031BT: ethylene oxide-terminated polyoxypropylene triol starting from glycerol with an OH value of 28 mg KOH / g and an OH functionality of about 2.3 (from Covestro);

[0181] Average molecular weight M determined by GPC n is about 6000g / mol

[0182] 6300: polyoxypropylene triol starting from glycerol, OH number 28 mg KOH / g, OH functionality >2.9 (from Covestro);

[0183] Average molecular weight M determined by GPC n is about 6700g / mol

[0184] CP 4755: ethylene oxide-terminated polyoxypropylene triol starting from glycerol with an OH value of 35 mgKOH / g and an OH functionality of about ...

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Abstract

The invention relates to an isocyanate group-containing polyether urethane polymer having an NCO content in the range from 1.3 to 1.9 wt% and a content of monomeric diisocyanates of not more than 0.5wt%, derived from the reaction of at least one monomeric aromatic diisocyanate and a polyether triol having an average OH functionality in the range from 2.2 to 2.6, an OH number in the range from 25to 32 mg KOH / g in an NCO / OH ratio of at least 3:1 and subsequent removal of a majority of the monomeric diisocyanates by means of a suitable separation process, and moisture-curing polyurethane compositions having a content of monomeric diisocyanates of less than 0.1 wt% containing said polymer. The polymer according to the invention allows very storage-stable moisture-curing polyurethane compositions, which are safe to handle even without special protective measures, are easy to process, have a long open time, cure rapidly to provide an elastic material of high extensibility and elasticity with high strength, high tear propagation resistance, good low-temperature flexibility, good adhesion properties and high resistance, in particular with respect to heat and UV radiation. Such polyurethane compositions are in particular suitable as elastic adhesives, sealants, and coatings.

Description

technical field [0001] The present invention relates to polymers with low monomer content for moisture-curing polyurethane compositions and their use as elastic adhesives, sealants and coatings. Background technique [0002] Polyurethane compositions crosslinked by reaction of isocyanate groups with moisture or water, curing in the process to form elastomers, used especially as elastic adhesives, sealants or coatings in the construction industry and manufacturing industry, e.g. during assembly For bonding assemblies, for filling joints, as a floor coating or as a roof sealant. Due to its good adhesion and elasticity, it perfectly damps and eliminates forces acting on the substrate, eg due to vibrations or temperature changes. [0003] Such polyurethane compositions comprise, as binder, polymers containing isocyanate groups which are produced by the reaction of polyols with monomeric diisocyanates. The polymers thus obtained contain a residual content of monomeric diisocyan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/48C08G18/76C08G18/10C09D175/08C08G18/30C08G18/32C08G18/42C09J175/08C08G18/24
CPCC08G18/4829C08G18/7671C09D175/08C09J175/08C08G18/10C08G18/246C08G18/307C08G18/3256C08G18/42C08G18/4825C08G18/4841C08G18/4866C08G2190/00C08G18/82C08G18/325C09D175/12C09J5/00C09J175/12C09J2475/00C08K2003/265C08K3/26C08K3/04C08K5/11C08K3/22C08K5/12
Inventor M·施伦普夫S·雷曼B·杜尔米克
Owner SIKA TECH AG
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