Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Patent
1992-12-07
1994-04-19
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
528 14, 528 15, 528 18, 528 19, 528 17, 528 21, 528 31, C08G 7706
Patent
active
053046218
DESCRIPTION:
BRIEF SUMMARY
The invention relates to organo(poly)siloxanes containing terminal siloxane units having organyloxy and hydrogen groups, to processes for their preparation and their use in organo(poly)siloxane compositions which are stable on storage in the absence of water but can be crosslinked in the presence of water at as low as room temperature with the elimination of alcohols to give elastomers, and to processes for the preparation of organo(poly)siloxane elastomers by crosslinking of compositions which are crosslinkable by adduct formation of Si-bound hydrogen with SiC-bound radicals having an aliphatic carbon-carbon multiple bond.
U.S. Pat. No. 4,755,578 (G. M. Lucas, General Electric Company; issued on Jul. 5, 1988) describes compositions containing diorganopolysiloxanes which contain terminal siloxane units having organyloxy groups, which compositions are stable on storage in the absence of water and can be crosslinked in the presence of moisture with the elimination of alcohol to give elastomers. These compositions contain a metal catalyst, in particular tin compounds, for accelerating the crosslinking rate, which, however, substantially impairs the storage stability of these compositions.
German Offenlegungsschrift 3,801,389 (Wacker-Chemie GmbH; issued on Jul. 27, 1989) and the corresponding U.S. application Ser. No. 29 3909 (filed on Jan. 6, 1989) describe organopolysiloxane compositions which are crosslinkable with the elimination of alcohols to give elastomers, which compositions are stabilised by means of salts from main and sub group II containing branched carboxylic acids. However, compositions of this type in general have a very low crosslinking rate, which makes it necessary to add metal compounds, such as, for example, tin compounds, as condensation catalyst for acceleration. However, this frequently impairs the storage stability, so that compositions of this type no longer cure or only cure at a very slow rate after an extended period of storage.
A large number of processes for the preparation of organopolysiloxane elastomers by crosslinking of compositions which are crosslinkable by adduct formation of Si-bound hydrogen with SiC-bound radicals having an aliphatic carbon-carbon multiple bond, in which the addition reaction is in general carried out in the presence of a catalyst, are known. However, the elastomer-forming compositions have in most cases very poor adhesion on a number of substrates, as a result of which many attempts have already been made to improve adhesion. To this end, the corresponding substrates were, for example, provided with a primer before applying these elastomer-forming compositions. However, such a procedure is not very desirable, since it involves additional process steps, such as application and drying. Another possibility is to incorporate substances having an adhesive action in the elastomer-forming compositions of this type before their application on the particular substrate or to modify the polymers contained in the elastomer-forming compositions with organic functions in a suitable manner. In this context, reference may be made, for example, to U.S. Pat. No. 4,737,562 (Dow Corning Corp.; issued on Apr. 12, 1988), U.S. Pat. No. 4,329,273 (General Electric Company; issued on May 11, 1982) and U.S. Pat. No. 3,996,195 (Shinetsu Chemical Company; issued on Dec. 7, 1976). In most cases, these substances having adhesive action or the adhesion-improving organic function cause substantial inhibition of the crosslinking catalyst, which in general is a metal from sub group VIII and compounds thereof, so that it is necessary to employ high temperatures for rapid vulcanisation and rapid development of the adhesive action.
The invention relates to organo(poly)siloxanes containing terminal siloxane units having organyloxy and hydrogen groups.
The organo(poly)siloxanes according to the invention containing terminal siloxane units having organyloxy and hydrogen groups are preferably those of the formula ##STR1## in which R, R.sup.1 and R.sup.2, independently of one another, can eac
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Absmaier Petra
Braun Rudolf
Brennenstuhl Werner
Mueller Johann
Staiger Gerhard
Connaughton Martin
Marquis Melvyn I.
Wacker-Chemie GmbH
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