Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Patent
1993-12-17
1995-05-30
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
528 30, 528 32, 522 99, 522 66, C08G 7712
Patent
active
054202221
DESCRIPTION:
BRIEF SUMMARY
The invention relates to organo(poly)siloxane compositions which can be crosslinked both on access of moisture And by irradiation, and to their use for the production of coatings.
Organo(poly)siloxane compositions which cure via two different crosslinking mechanisms are in general called dual systems and are already known.
One problem of purely moisture-curing organo(poly)siloxane formulations is that the rate of the curing reaction of these formulations depends on the diffusion of water through the surface. Above a certain layer thickness, complete curing can no longer proceed as rapidly as on the surface, for example within a few seconds, so that the curable organo(poly)siloxane formulation of this type cannot be used for applications where the glueing or sealing properties of the substance must be achieved within a short time. On the other hand, radiation-curable organo(poly)siloxane mixtures have the disadvantage that although they cure rapidly where they are exposed to direct radiation, curing progresses only slowly in the shadow regions.
To avoid these disadvantages, attempts have therefore been made to combine both types of crosslinking. Reference may be made in this context to EP-A 182,941 (Loctite Corp.; published 4th Jun. 1986), U.S. Pat. No. 4,699,802 (Loctite Corp.; published 13th Oct. 1987), EP-A 315,342 (Dow Cotming Corp.; published 10th May 1989) and EP-A 332,400 (Shin-Etsu Chemical Co., Ltd.; published 13th Sep. 1989), in which organo(poly)siloxane compositions which also contain, in addition to units having acrylic functional groups or acrylamide functional groups, hydrolysable groups, such as alkoxy radicals, are described. U.S. Pat. No. 4,579,636 (Shin-Etsu Chemical Co., Ltd.; published 1st Apr. 1986) moreover describes compositions which are obtained by mixing hydroxyl-terminated organo(poly)siloxane with vinyltrialkoxysilane and organo(poly)siloxanes having mercapto functional groups and can be crosslinked by radiation and also by moisture. U.S. Pat. No. 4,889,905 (Toray Silicone Co., Ltd.; published 26th Dec. 1989) moreover describes compositions which can be cured by irradiation and are composed of an organo(poly)siloxane containing alkenyl functional groups, an organo(poly)siloxane containing mercapto functional groups and an organosilicon compound which contains both alkenyl groups and alkoxy groups.
There was the object of providing curable organo(poly)siloxane compositions.
The invention relates to organo(poly)siloxane compositions which contain
(A) units of the formula identical or different and denote a monovalent, optionally substituted hydrocarbon radical and a is 1 or 2, (B) siloxane units which are crosslinkable by irradiation of the formula (II) and/or (III), and if appropriate (C) siloxane units which act as a photoinitiator of the formula (V).
R.sup.1 and R.sup.2 are in each case independently of one another preferably a monovalent, optionally substituted hydrocarbon radical having 1 to 13 carbon atom(s).
Examples of hydrocarbon radicals having 1 to 13 carbon atom(s) are alkyl radicals, such as the methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, tert-butyl, n-pentyl, iso-pentyl, neo-pentyl and tert-pentyl radical, hexyl radicals, such as the n-hexyl radical, heptyl radicals, such as the n-heptyl radical, octyl radicals, such as the n-octyl radical, and iso-octyl radicals, such as the 2,2,4-trimethylpentyl radical, nonyl radicals, such as the n-nonyl radical, decyl radicals, such as the n-decyl radical, and dodecyl radicals, such as the n-dodecyl radical; alkenyl radicals, such as the vinyl and the allyl radical; cycloalkyl radicals, such as cyclopentyl, cyclohexyl and cycloheptyl radicals and methylcyclohexyl radicals; aryl radicals, such as the phenyl and the naphthyl radical; alkaryl radicals, such as o-, m- and p-tolyl radicals, xylyl radicals and ethylphenyl radicals; and aralkyl radicals, such as the benzyl radical and the alpha- and the .beta.-phenethyl radical.
Examples of substituted hydrocarbon radicals are alkoxyalkyl radicals, such as the methoxyethyl
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Brennenstuhl Werner
Mueller Johann
Stepp Michael
Connaughton Martin
Marquis Melvyn I.
Wacker-Chemie GmbH
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