摘要:
Anhydride-functional organo(poly)siloxanes having average units of the general formula ##EQU1## in which the R(s) are the same or different and represent a monovalent hydrocarbon radical or a monovalent halogenated hydrocarbon radical having from 1 to 18 carbon atom(s) per radical, A represents a radical of the formula ##STR1## in which R.sup.1 represents a hydrogen atom or a monovalent hydrocarbon radical or a monovalent halogenated hydrocarbon radical having from 1 to 12 carbon atom(s) per radical and R.sup.2 represents a hydrogen atom or a monovalent hydrocarbon radical having from 1 to 12 carbon atom(s) per radical, or the two radicals R and R.sup.2 together represent a divalent hyrocarbon radical having from 3 to 5 carbon atoms per radical, R.sup.3 represents a hydrogen atom or a monovalent hydrocarbon radical having from 1 to 4 carbon atom(s) per radical, with the proviso that R.sup.3 is a hydrogen atom if the two radicals R.sup.1 and R.sup.2 together represent a divalent hydrocarbon radical having from 3 to 5 carbon atoms per radical, R.sup.4, which may be the same or different, represent a hydrogen atom, a halogen atom or a cyano radical, a is 0 or 1, with an average of from 0.003 to 1.0, b is 0, 1, 2 or 3, with an average of from 0.05 to 2.5, and the sum of a+b is an average which is not greater than 3, with the proviso that at least one A radical is present per molecule.
摘要:
Thermally stable, crosslinked epoxy resins are obtained by crosslinking an epoxy resin with a silicon compound containing a basic nitrogen which is bonded to silicon via carbon and to which at least 1 hydrogen atom is bonded directly to the nitrogen atom, and thereafter conditioning the crosslinked epoxy resin.
摘要:
The Thermocurable compositions which contain(A) at least one mercaptoalkyl-containing compound which contains at least two SiC-bonded radicals per molecule of the general formulaHS--R.sup.2 -- (I) where R.sup.2 represents a divalent hydrocarbon radical having from 1 to 8 carbon atom(s) per radical, selected from the group consisting mercaptoalkyl-containing organopolysiloxanes and cocondensates of mercaptoalkyl-containing organosilicon compounds containing groups capable of condensation, and hydroxyl-containing organic compounds,(B) at least one vinyl-containing compound which is compatible with constituent (A) and contains at least two groups per molecule of the general formulaR.sup.4 CH.dbd.CR.sup.3 C(O)O-- (II) where R.sup.3 represents a hydrogen atom or a methyl radical, and R.sup.4 represents a hydrogen atom or an alkyl radical having from 1 to 3 carbon atom(s) per radical, and(C) a mixture of a strong organic base selected from the group consisting of quaternary ammonium hydroxides, quaternary ammonium alkoxides, tertiary, secondary and primary amines, and a weak protonic acid.
摘要:
Organopolysiloxane modified organic polymers are prepared by reacting organic polymers containing C-bonded hydroxyl groups with organopolysiloxanes containing Si-bonded hydroxyl groups and/or alkyl groups which are bonded to silicon via oxygen in the presence of water in excess of any formed during the reaction.