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AssigneeHuels Aktiengesellschaft
InventorsGuenther Bernhardt, Klaus-Dieter Steffen, Margret Haas, Heinz Kragl
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The invention relates to a process for preparing N,N'-disubstituted p-quinonediimines of general formula I ##STR1## wherein a corresponding N,N'-disubstituted p-phenylenediamine is oxidized in alkaline/alcoholic solution, and also their use. The invention further provides organosilanes containing methacryloxy or acryloxy groups and having general formula II ##STR2## where R.sup.3 is a hydrogen atom or a methyl group and R.sup.4 and R.sup.5 are identical or different alkyl groups having from 1 to 4 carbon atoms and m is equal to 0 or 1 or 2, which organosilanes contain N,N'-disubstituted p-quinonediimines. Processes for preparing and stabilizing organosilanes of general formula II are described.
An organosilane containing methacryloxy or acryloxy groups and having formula II ##STR22## wherein R.sup.3 is a hydrogen atom or a methyl group, R.sup.4 and R.sup.5 are identical or different alkyl groups having from 1 to 4 carbon atoms, and m is equal to 0, 1 or 2, which contains as a stabilizer one or more N,N-disubstituted p-quinonediimines of formula I ##STR23## wherein R.sup.1 and R.sup.2 are identical or different and are each a phenyl group, a straight-chain or branched alkyl group having from 3 to 8 carbon atoms or a cyclohexyl group.
A process for stabilizing an organosilane containing methacryloxy or acryloxy groups and having formula II ##STR26## wherein R.sup.3 is a hydrogen atom or a methyl group, R.sup.4 and R.sup.5 are identical or different alkyl groups having from 1 to 4 carbon atoms, and m is equal to 0, 1 or 2, comprising adding to said organosilane a N,N'-disubstituted p-quinonediimine of formula I ##STR27## wherein R.sup.1 and R.sup.2 are identical or different and are each a phenyl group, a straight-chain or branched alkyl group having from 3 to 8 carbon atoms or a cyclohexyl group.
A phase-transfer catalysis process for preparing an organosilane containing methacryloxy or acryloxy groups and having formula II ##STR31## wherein R.sup.3 is a hydrogen atom or a methyl group, R.sup.4 and R.sup.5 are identical or different alkyl groups having from 1 to 4 carbon atoms, and m is equal to 0, 1 or 2, comprising stabilizing said crude organosilane during a phase-transfer catalysis process with a N,N'-disubstituted p-quinonediimine of formula I ##STR32## wherein R.sup.1 and R.sup.2 are identical or different and are each a phenyl group, a straight-chain or branched alkyl group having from 3 to 8 carbon atoms or a cyclohexyl group.
Dependencies are inferred from the claim text.