Moisture-curable, polyether urethanes with reactive silane groups and their use as sealants, adhesives and coatings

Abstract

A moisture-curable, alkoxysilane-functional polyether urethane containing a) 20 to 90% by weight, of a polyether urethane containing two or more reactive silane groups and one or more polyether segments, where the polyether segments have a number average molecular weight (Mn) of at least 3000 and a degree of unsaturati on of less than 0.04 milliequivalents / g, and the sum of Mn of all of the polyeth er segments per molecule averages 6000 to 20,000, and the reactive silane groups are incorporated by the reaction of an isocyanate group with a compound of formula (I) and b) 10 to 80% by weight, of a polyether urethane containing one react ive silane group and one or more polyether segments having Mn of 1000 to 15,000.

Description

[0001] Cross references to related patent applications [0002] This application is a continuation-in-part of US Patent Serial No. 10 / 160361 filed May 31,2002. technical field [0003] The present invention relates to moisture-curable urethanes containing reactive silyl groups and prepared from polyether polyols with low unsaturation, and to the use of these polyurethanes as sealants, adhesives and coatings. Background of the invention [0004] Polyether urethanes containing reactive silane groups, also known as silane-terminated polyurethanes (STP), and their use as sealants and adhesives are known, eg US patents 5554709, 4857623, 5227434 and 6197912 and described in WO 02 / 06367. Silane-terminated polyurethanes can be prepared by different methods. In one approach, silane-terminated polyurethanes are prepared by reacting a diisocyanate with a polyether polyol to form an isocyanate-terminated prepolymer, which is then react...

AI Technical Summary

Problems solved by technology

The application fails to recognize the need to use secondary amino functional silanes to incorporate reactive silyl groups

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