Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1996-12-09
1998-04-28
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
526204, 526217, C08K 520
Patent
active
057445435
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a one-component reactive adhesive based on an aerobic adhesive.
DISCUSSION OF RELATED ART
Aerobic adhesives are known. Thus, DE 38 29 438 and DE 38 29 461, for example, describe ethylenically unsaturated polymerizable compounds which polymerize on exposure to oxygen through the presence of a certain activator system. The activator system consists of N-alkyl-substituted tertiary aryl amines containing at least one aliphatic CH bond in the .alpha.-position, for example dimethyl aniline or dimethyl-p-toluidine, a metal compound soluble in the system to accelerate the drying of unsaturated oils and a carboxylic acid with a pKs value of 0.9 to 7. Preferred drying agents are metal compounds which occur in several valency stages, more particularly metal compounds of cobalt, manganese or iron. The carboxylic acids are monomeric or polymeric carboxylic acids, preferably ethylenically unsaturated monocarboxylic or dicarboxylic acids, such as acrylic acid, methacrylic acid and maleic acid. The free carboxylic acid may be replaced by a hydrolyzable derivative, for example an anhydride.
DE-OSS 40 00 776 and 41 23 194 describe radical-polymerizable multicomponent mixtures of olefinically unsaturated compounds which contain hydrazones as initiators and which are stable in storage in the absence of air. The main component of the initiator consists of alkyl, cycloalkyl or aryl hydrazones of aliphatic, cycloaliphatic or aromatic aldehydes or ketones which are capable of forming hydroperoxides. The initiator system preferably also contains soluble metal compounds of the type used for drying unsaturated oils, for example compounds of copper or manganese, more particularly divalent or trivalent iron. Reducing agents with an accelerating effect on the radical polymerization, for example hydroxy ketones, may also be present.
DE 43 30 354 describes radical-polymerizable compositions of olefinically unsaturated compounds which polymerize on exposure to air through the presence of certain furanones. In their case, too, soluble metal compounds, more particularly iron, cobalt and manganese, act as activator.
Other aerobic adhesives containing dihydropyridines in the initiator system are described in patent applications IE 91/741 and IE 91/742 in the name of Loctite.
These known aerobic adhesives form effective bonds in a short time. However, there are also applications which require relatively high strength both at the beginning of bonding and after curing.
Accordingly, the problem addressed by the present invention was to raise the property level of aerobic adhesives, more particularly in regard to ultimate strength, but also in regard to early strength.
DESCRIPTION OF THE INVENTION
The solution provided by the invention is defined in the claims and is essentially characterized in that the adhesive contains isocyanate and/or silane groups as further active groups. These additional functional groups may either be directly chemically attached to the radical-polymerizable olefinically unsaturated monomers or may form independent compounds. In the latter case, the compounds in question are known from one-component polyurethane adhesives. These are moisture-crosslinking systems of polyisocyanates which are normally produced from polyols of relatively high molecular weight with more than the stoichiometric quantity of isocyanate (so-called isocyanate polyurethanes). It is also known that corresponding polyisocyanate compounds can be reacted with alkoxysilane compounds to form alkoxysilane-terminated polyurethanes. The NCO groups may be more or less completely replaced by silane groups. Monomers such as these and their use in reactive adhesives are known.
Alkoxysilane-terminated moisture-curing polyurethanes are described, for example, in DE 36 29 237. They are produced by initially reacting OH-terminated diols and/or triols with diisocyanates to form NCO-terminated polyurethanes with an NCO functionality of at least 2. Some of the NCO groups in aliphatic alcohols are then reacted to
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Bolte Gerd
Fischer Herbert
Huver Thomas
Klauck Wolfgang
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Meder Martin G.
Sarofim N.
Schofer Joseph L.
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