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filingDate 1979-05-09-04:00^^<http://www.w3.org/2001/XMLSchema#date>
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publicationDate 1980-01-09-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber EP-0006432-A2
titleOfInvention Process for preparing heat-curable polysiloxane resins
abstract OR' eine Alkoxygruppe von primären oder sekundären aliphatischen Alkoholen mit 1 bis 4 C-Atomen, R 2 eine Alkyl- und/oder Phenylgruppe ist. a einen Wert von 1,0 bis 1,5, b einen Wert von 0,1 bis 0,7 hat, mit niedermolekularen mehrwertigen Alkoholen, wie Äthylenglykol. Trimethyloläthan und Trimethylolpropan oder einem Gemisch dieser Alkohole, bei Temperaturen von 100 bis 160°C gegebenenfalls in Gegenwart an sich bekannter Umesterungskatalysatoren und Lösungsmitteln unter Entfernung des Alkohols R 1 OH in einem solchen Mengenverhältnis, dass einer SiOR 1 -Gruppe etwa eine COH-Gruppe entspricht und die Reaktion bei einem Umsetzungsgrad von 25 bis 80% durch Abkühlen auf eine Temperatur 100°C abgebrochen wird. Die erfindungsgemäss hergestellten Siliconharze sind in unausgehärtetem Zustand praktisch unbegrenzt lagerfähig, ohne dass sich die Viskosität der Produkte oder ihrer Lösungen verändert. Sie haben eine ausgezeichnete Pigmentverträglichkeit und hohe Aushärtungsgeschwindigkeit Die ausgehärteten Siliconharze verbinden hohe Thermostabilität mit guter Elastizität und guter Haftung auf metallischem Untergrund. The invention relates to a process for the production of thermosetting silicone resins by reacting siloxanes of the general formula wherein OR 'an alkoxy group of primary or secondary aliphatic alcohols with 1 to 4 carbon atoms, R 2 is an alkyl and / or phenyl group. a a value from 1.0 to 1.5, b has a value of 0.1 to 0.7, with low molecular weight polyhydric alcohols, such as ethylene glycol. Trimethylolethane and trimethylolpropane or a mixture of these alcohols, at temperatures from 100 to 160 ° C., optionally in the presence of known transesterification catalysts and solvents, with removal of the alcohol R 1 OH in such a ratio that an SiOR 1 group corresponds approximately to one COH group and the reaction is stopped at a degree of conversion of 25 to 80% by cooling to a temperature of 100 ° C. The silicone resins produced according to the invention can be stored practically indefinitely in the uncured state without the viscosity of the products or their solutions changing. They have excellent pigment compatibility and high curing speed. The cured silicone resins combine high thermal stability with good elasticity and good adhesion to metallic substrates.
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http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0679677-A3
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http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0157318-A3
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