Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1998-03-24
2000-02-15
Moore, Margaret G.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
528 33, 524588, 524862, 156329, 156327, 156326, C09J20110
Patent
active
060254165
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a two-component adhesive/sealant based on silane-terminated prepolymers, to a process for its production and to its use for the elastic bonding of two or more like and/or different substrates.
BACKGROUND OF THE INVENTION
In the metal-processing industry, the vehicle industry, the utility-vehicle industry and their supplier industries, in the repair of motor vehicles and in the building industry, like or different metallic and non-metallic substrates are often adhesively or sealingly joined to one another. Various one-component and two-component adhesives/sealants are already available for this purpose. One-component adhesives/sealants are generally preferred by users because no mixing or metering errors can occur in use. In the bonding of non-porous substrates, the use of one-component moisture-curing adhesives/sealants is very limited on account of their very slow curing rate. Both one-component adhesives/sealants and conventional two-component adhesives/sealants curing at room temperature are very much in need of improvement in another respect: immediately after the parts to be joined have been fitted together, they have a very poor early strength so that the joined parts first have to be mechanically fixed until the bond has developed sufficient strength.
Accordingly, the problem addressed by the present invention was to provide adhesive/sealant compositions which, immediately after application and fitting of the parts to be joined, would have such high early strength that, in almost every application, there would be no need for mechanical fixing.
DETAILED DESCRIPTION OF THE INVENTION
It has now been found that two-component adhesives/sealants based on silane-terminated prepolymers, of which component A is a one-component moisture-curing adhesive/sealant while component B is a crosslinker and/or accelerator for component A, satisfy these requirements in a surprisingly effective manner. The adhesives/sealants according to the invention not only have high early strength, they also show such favorable adhesion behavior on a number of metallic and non-metallic substrates that there is generally no need for surface preparation with a so-called primer.
Silane-terminated prepolymers in the context of the invention are polymers with molecular weights in the range from 1,000 to 50,000 which contain at least one reactive terminal group corresponding to the following formula: ##STR1## in which A is a 1.5- to 4-functional residue of a polyether, polyester, (meth)acrylate polymer, polybutadiene or polyisobutylene, n is a number of 1 to 4 and the substituents R.sup.1 to R.sup.3 are non-hydrolyzable C.sub.1-4 alkyl groups and/or hydrolyzing alkoxy, acetoxy, oxime ether or amide groups. In a preferred embodiment, at least two of these substituents are hydrolyzable.
The production of moisture-curing compositions containing reactive silane groups which harden at room temperature from acrylate or methacrylate derivatives is described, for example, in JP-B-84/78221, JP-B-84/78222, U.S. Pat. Nos. 4,491,650 and 4,567,107.
In principle, the particularly preferred silane-terminated prepolymers based on polyethers may be produced in various ways: compounds, for example allyl chloride, in an ether synthesis to form polyethers containing terminal olefinic double bonds which, in turn, are reacted with hydrosilane compounds containing hydrolyzable groups, for example HSi(OCH.sub.3).sub.3, in a hydrosilylation reaction catalyzed, for example, by transition metals belonging to the 8th group to form silane-terminated polyethers. groups are reacted with a mercaptosilane, for example with 3-mercaptopropyl trialkoxysilane. diisocyanates or polyisocyanates and the products of this reaction are reacted with aminofunctional silanes or mercaptofunctional silanes to form silane-terminated prepolymers.
Another method comprises reacting hydroxyfunctional polyethers with isocyanate-functional silanes such as, for example, 3-isocyanatopropyl trimethoxysilane.
These production processes and the use of the silane-ter
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Proebster Manfred
Schumacher Werner
Harper Stephen D.
Henkel Teroson GmbH
Jaeschke Wayne C.
Moore Margaret G.
Szoke Ernest G.
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