Abstract:
NOVEL CROSS-LINKING AGENTS ARE DISCLOSED WHICH CAN BE COMBINED WITH PLASTICALLY SHAPABLE ORGANO-POLYSILOXANES; THE RESULTING NOVEL MIXTURES OR COMPOSITIONS BEING STORAGE STABLE UNDER EXCLUSION OF ALL MOISTURE. THE CROSSLINKING REACTION TAKES PLACE ON EXPOSURE OF THE COMPOSITIONS TO WATER, ATMOSPHERIC HUMIDITY SUFFICING, AT TEMPERATAURES BELOW 50*C. THE COMPOSITIONS ARE ESPECIALLY ADAPTED TO BE USED FOR THE FILLING OF JOINTS AND AS SEALING MATERIALS IN THE BUILDING INDUSTRY. THE ELASTOMERS RESULTING THEREFROM HAVE AN INCREASED ADHESION TO THE SUBSTRATE SAVING THE EXPENDITURE OF PRIMING. THE NOVEL COMPOSITIONS COMPRISE: (A) AN A,W-DIHYDROXY-POLY-(DIMETHYL-SILOXANE) WHICH, IN ADDITION TO ITS DIORGANO-SILOXANE UNITS, MAY CONTAIN UP TO 10 MOL-PERCENT OF SILOXANE UNITS HAVING THE FORMULA CH3SIO3/2, AND MAY BE ADMIXED WITH FILLERS AND AN A,W-BIS-(TRIMETHYL-SILOXY) - POLY - (DIMETHYL-SILOXANE); AND (B) A CROSS-LINKING AGENT HAVING THE FORMULA
(RO-)3SI-CH(R'')-N(R")-R''"
IN WHICH R IS AN ALKYL RADICAL WITH 1 TO 4 CARBON ATOMS; R'' IS A HYDROGEN ATOM, AN ALKYL RADICAL WITH 1 TO 6 CARBON ATOMS OR A PHENYL RADICAL; R" IS A HYDROGEN ATOM OR A METHYL RADICAL; AND R''" IS A HYDROGEN ATOM, AN ALKYL, CYCLOALKYL, AMINOALKYL, (METHYLAMINO)-ALKYL OR (DIMETHYLAMINO)-ALKYL RADICAL WITH 1 TO 6 CARBON ATOMS IN ITS ALKYL GROUP, OR A RADICAL HAVING THE FORMULA (RO-)3SICH(R'')-OR THE FORMULA
Abstract:
New organosilyl- and carbamate-modified urea derivatives have the formula IN WHICH R and R'' are monovalent hydrocarbon radicals, R'''' and R'''''' are hydrogen atoms or monovalent hydrocarbon radicals, Q'' is a bivalent hydrocarbon radical, Q is a monovalent to hexavalent hydrocarbon radical, a is 0, 1, 2 or 3, n is 2, 3 or 4, b is zero or an integer from 1 to 200, and c is the valency number of Q. These urea derivatives are prepared by reacting at a temperature of from -20* to 150* C an aminoalkyl-silane derivative of the formula WITH AN ISOCYANATE-MODIFIED CARBAMIC ACID ESTER OF THE FORMULA The products are to be used as priming agents imparting adhesion to synthetic resins on siliceous surfaces, as surfactants and as intermediates for organo-polysiloxane resins.
Abstract:
New organosilyl-modified carbamic acid esters have the formula IN WHICH R, R'' and R'''''' are monovalent hydrocarbon radicals, R'''' is a hydrogen atom a methyl radical or a phenyl radical, Q is a monovalent to hexavalent hydrocarbon radical having up to 6 carbon atoms, a is 0, 1, 2 or 3, n is 2, 3 or 4, b is zero or an integer from 1 to 200, and c is the valency number of Q. These carbamic acid derivates are prepared by reacting at a temperature of from 20* to 150* C., an aminomethyl-silane derivative of the formula WITH A CHLOROFORMIC ACID ESTER OF THE FORMULA IN THE PRESENCE OF A TERTIARY AMINE. The products are to be used as priming agents imparting adhesion to synthetic resins on siliceous surfaces, as surfactants and as intermediates for organo-polysiloxane resins.
Abstract:
NOVEL CYCLIC THIOUREA DERIVATIVES CONTAINING SILICON ATOMS HAVE THE GENERAL FORMULA WHEREIN R IS A HYDROCARBON RADICAL OPTIONALLY BEING INTERRUPTED BY OXYGEN ATOMS IN ETHER LINKAGES, R'' AND R" (SAME OR DIFFERENT) ARE HYDROCARBON RADICALS, HALOHYDROCARBON RADICALS, CYANOHYDROCARBON RADICALS, OR ALKOXY RADICALS, AND R''" IS A HYDROCARBON RADICAL. THE COMPOUNDS ARE USEFUL AS CROSS-LINKING AGENTS AND AS INTERMEDOATES FOR CARBOFUNCTIONAL SILOXANES. THESE 2,5-DIAZA-3-SILACYCLOPENTATHIONES CAN BE PRODUCED, ACCORDING TO THE INVENTION, BY REACTING AN AMINOMETHYLALKOXYSILANE OF THE GENERAL FORMULA
R"''-NH-CH2-SI(-R'')(-R")-O-X
(R'', R" AND R''" AS ABOVE; X =ALKYL) AT A TEMPERATURE BETWEEN 0 AND 250*C. WITH AN ISOTHIOCYANATE OF THE GENERAL FORMULA RNCS (R AS ABOVE) AND RECOVERING THE PRODUCT BY DISTILLATION UNDER REDCUED PRESSURE OR BY FILTRATION. THESE PRODUCTS ARE SUITABLE AS INTERMEDIATES FOR CARBOFUNCTIONAL ORGANOPOLYSILOXANES AND AS CROSS-LINKING AGENTS IN WATER-REACTIVE ORGANOPOLYSILOXANE PREPARATIONS.
Abstract:
New carbofunctional organosilanes which may be regarded as alkoxysilyl- and glycidyl ether-substituted carbamate-modified urea derivatives having the formula
are obtained by reacting an aminomethyl-alkoxysilane of the formula
with an epoxy-organo-isocyanate of the formula
at a temperature below 50*C. In these formulae R is alkyl; R'' is alkyl, cyclohexyl or phenyl; R'''' is alkylene or cycloalkylene; n is 1, 2 or 3. The products are utilizable for priming silicious surfaces and for cross-linking convertible organopolysiloxanes.
Abstract:
This invention discloses a silyl-substituted urea derivative of controlled reactivity, high storage stability and which improve the properties of the cross-linked end products obtained by the prior art. The silyl-substituted urea comprises the general formula:
WHEREIN R represents a C1-C18 alkyl, C4-C14 cycloalkyl or a phenyl radical, R'' represents a C1-C10 alkyl, C4-C10 cycloalkyl or C6-C10 aryl radical which may be halogenated or cyano-substituted, R'''' represents a hydrogen atom or a methyl or phenyl radical; R'''''' represents a hydrogen atom or a C1-C18 alkyl, C4-C14 cycloalkyl or C6-C14 aryl radical which may be halogenated or cyano-substituted; Q'' represents an alkyl radical containing from 4 to 12 carbon atoms with a valency of (b + 1) or a C4-C14 cycloalkyl, C7-C15 arylalkyl, C6-C14 aryl or C8 alkylaryl radical, all of which radicals have a valency of (b + 1); Q represents a c-valent radical which has been obtained by the removal of C HX groups from a compound with a molecular weight of 200 to 150,000, preferably from 4000 to 80,000, which contains ester, amide, urethane, thioether, acetal, urea, hydrazodicarbonamide, hydrazide and/or carbonate groups and may also contain additional ether groups; A 0, 1 OR 2; B 1 TO 7, PREFERABLY 1 OR 2; C 1 TO 8, PREFERABLY 2 OR 3 AND X O, S, NH or N-Y- (Y C1-C8 alkyl radicals).
AND OPTIONALLY FURTHER STRUCTURAL UNITS OF THE FORMULA R''A-SI-O/4-A WHEREIN HOWEVER AT LEAT ONE OF EVERY THOUSAND STRUCTURAL UNITS CORRESPONDS TO THE FIRST OF THE ABOVE FORMULAE. IN THESE FORMULAE R'' AND R" ARE MONOVALENT HYDROCARBON RADICALS OF UP TO 10 CARBON ATOMS, R" IS A HYDROGEN ATOM, AMETHYL RADICAL OR A PHENYL RADICAL. Q IS A MONOVALENT TO HEXAVALENT HYDROCARBON RADICAL HAVING UP TO 6 CARBON ATOMS, M IS 0, 1 OR 2, N IS 2, 3 OR 4, A IS 0, 1, 2 OR 3, B IS ZERO OR AN INTEGER FROM 1 TO 200, AND C IS THE VALENCY NUMBER OF Q. THESE CARBAMIC ACID DERIVATIVES ARE PREPARED EITHER BY HYDROLYZING A CORESPONDING, ALKOXYSILY-SUBSTIUTED CARBAMIC ACID ESTER, OPTIONALLY IN ADMIXTURE WITH HYDROCABON-SUBSTITUTED ALKOXYSILANES, OR BY REACTING A CORRESPONDING AMINOMETHYL-SUBSTITUTED POLYSILOXANE WITH A CHLOROFORMIC ACID ESTER OF THE FORMULA (CL-COO-(CNH2N-O)B)C-Q IN THE PRESENCE OF A TERTIARY AMINE. THE PRODUCTS ARE TO BE USED AS PRIMING AGENTS IMPARTING ADHESION TO SYNTHETIC RESINS ON SILICEOUS SURFACES, AS SURFACTANTS AND AS INTERMEDIATES FOR ORGANO-POLYSIOLOXANE RESINS.
AND OPTIONALLY FURTHER STRUCTURAL UNITS OF THE FORMULA
(R'')A-SI-O(4-A/2)
WHEREIN HOWEVER AT LEAST ONE OF A THOUSAND STRUCTURAL UNITS CORRESPONDS TO THE FIRST OF THE ABOVE FORMULAE. IN THESE FORMULAE R'' IS A M ONOVALENT HYDROCARBON RADICAL, R" AND R" ARE HYDROGEN ATOMS OR MONOVALENT HYDROCARBON RADICALS, Q'' IS A BIVALENT HYDROCARBON RADICAL, Q IS A MONOVALENT TO HEXAVALENT HYDROCARBON RADICAL, M IS 0, 1 OR 2, N IS 2, 3 OR 4, A IS 0, 1, 2 OR 3, B IS ZERO OR AN INTERGER FROM 1 TO 200, AND C IS THE VALENCY NUMBER OF Q. THESE UREA DERIVATIVES ARE PREPARED EITHER BY HYDROLYZING A CORRESPONDING ALKOXYSILYL-SUBSTITUTED CARBAMATEMODIFIED UREA DERIVATIVE, OPTIONALLY IN ADMIXTURE WITH HYDROCARBON-SUBSTITUTED ALKOXYSILANES, OR BY REACTING A CORRESPONDING AMINOLKYL-SUBSTITUTED POLYSILOXANE WITH AN ISOCYANATE-MODIFIED CARBAMIC ACID ESTER OF THE FORMULA
(O-CN-Q''-NH-COO-(CNH2N-O)B)C-Q
THE PRODUCTS ARE TO BE USED AS PRIMING AGENTS IMPARTING ADHESION TO SYNTHETIC RESINS ON SILICEOUS SURFACES, AS SURFACTANTS AND AS INTERMEDIATES FOR ORGANO-POLYSILOXANE RESINS.
Abstract:
Novel cross-linking agents are disclosed which can be combined with plastically shapable organopolysiloxanes; the resulting novel mixtures or compositions being storage stable under exclusion of all moisture. The cross-linking reaction takes place on exposure of the compositions to water, atmospheric humidity sufficing, at temperatures below 50* C. The compositions are especially adapted to be used for the filling of joints and as sealing materials in the building industry. The elastomers resulting therefrom have an increased adhesion to the substrate saving the expenditure of priming, and are transparent. The novel compositions comprise: A. an Alpha , omega -dihydroxy-poly-(diorgano-siloxane) which, in addition to its diorganosiloxane units, may contain up to 10 mol-percent of siloxane units having the formula CH3SiO3/2, and may be admixed with fillers and an Alpha , omega -bis(trimethyl-siloxy)-poly-(diorgano-siloxane); and B. a cross-linking agent having the formula ((RO-)3Si-CH(R''))nNQ3 n IN WHICH N IS 2 OR 3, R is an alkyl radical with 1 to 4 carbon atoms, R'' is a hydrogen atom, an alkyl radical with 1 to 6 carbon atoms, a cyclohexyl radical a phenyl radical, and Q is an alkyl or alkenyl radical with 2 to 4 carbon atoms, an aralkyl radical with 7 to 10 carbon atoms, a dimethylaminoalkyl radical with 2 to 4 carbon atoms in its alkylene group, or a methoxy- or ethoxyethyl or -propyl radical.