Th. Goldschmidt Ag

Siemens Aktiengesellschaft

Evonik Goldschmidt Corporation

Dietmar Wewers

Christian Weitemeyer

Dietmar Schaefer

Jurgen Jachmann

Andreas Weier

Peter Lersch

Wolfgang Rogler

Thomas Ebbrecht

Gotz Koerner

Georg Burkhart

Georg Markowz

Roland Hubel

Helmut Markert

Manfred Recksik

Bernhard Stapp

Frederic Zapf

Markus Rudek

Florian Zeller-Schuldes

Goetz-Robert Koerner

Juergen Jachmann

Stefan Busch

The invention relates to a process and to an apparatus for preparing polyether alcohols by alkoxylating alcohols, and also long-chain polyether alcohols having a narrow product distribution. The process is preferably carried out continuously in the liquid phase in a microstructured reactor. An alkylene oxide or different alkylene oxides are metered at one or more points into the channels of the microreactor. The channels are cooled with the aid of a cooling medium or heated with the aid of a heating medium.

Alkoxylations in microstructured capillary reactors

Organopolysiloxanes, which terminally, laterally or both have at least one group of the formula ##STR1## well as at least one acrylate group, linked over a bridge element to this group, is obtained by hydrosilylation of organopolysiloxanes with at least one SiH group by compounds, which have at least two acrylate groups, in equimolar amounts at a temperature of 60.degree. to 130.degree. C. in presence of rhodium catalysts. The rhodium catalysts cause a 1,2 addition to take place during the addition reaction between polyacrylates and hydrogen siloxanes.

Organopolysiloxanes, modified with acrylate groups in the presence of a

An abhesive coating composition is based on an organopolysiloxane having radiation-curing (meth)acrylate ester groups, which contains an additive that affects the degree of abhesiveness, the additive being obtained by the reaction of an MQ resin with a polysiloxane containing (meth)acrylate ester groups.

Abhesive coating composition with an additive, which affects the degree

Polyether siloxanes, which are linked to the polysiloxane backbone through Si--C bonds, are synthesized by reacting given polysiloxanes with a compound having at least one epoxide group in such amounts, that there are at least two epoxide groups per OH group, in the presence of Lewis acids at temperatures not exceeding 60.degree. C. or in the presence of complex catalysts, which accelerate the addition between epoxide groups and hydroxyl groups, at temperatures up to 140.degree. C., the reaction optionally being carried out in the presence of an inert solvent. The polyether siloxanes obtained have a defined functionality and are free of excess, unreacted polyol components.

Method for the synthesis of polyether siloxanes

Polysiloxanes of the general formula ##STR1## which contain at least one sulfatohexyl group linked by an Si--C bond are prepared wherein R.sup.1 is a methyl or phenyl group with the proviso that at least 90% of the R.sup.1 groups are methyl groups, R.sup.2 either is identical with R.sup.1 or is --(CH.sub.2).sub.6 --OSO.sub.3.sup.-.M.sup.+, M.sup.+ being an alkali, 1/2 alkaline earth or optionally an alkyl-substituted ammonium ion, R.sup.3 is identical with R.sup.1 or R.sup.2, with the proviso that at least one R.sup.2 or R.sup.3 group in the average molecule is a --(CH.sub.2).sub.6 --OSO3.sup.-.M.sup.+ group, 'a'=0 to 5 and b=0 to 5. A method for the synthesis of these compounds and their use as hydrolysis-resistant surfactants is also described.

Polysiloxanes with at least one sulfatohexyl group linked by an Si-C bond

Organopolysiloxanes having polyether and ester groups linked to a common spacer group, wherein the spacer group is linked through an SiC bond to the siloxane backbone and a method for the synthesis thereof are disclosed. These compounds are useful as additives for plastics, lacquers and binders for reducing the coefficient of sliding friction, for improving scratch resistance and increasing abhesiveness. If the compounds are esters of acrylic or methacrylic acid, they can be used as radiation-curable lacquers and coating compositions.

Organopolysiloxanes with polyether and ester groups linked to a common

2-(3'-butenyl)-3,4-dihydro-2H-pyrans of the general formula ##STR1## wherein R is a hydrogen group or an alkyl group with 1 to 6 carbon atoms. Methods for the synthesis of these compounds and their use as reactive modifiers or diluents for cationically curable monomers or polymers.

2-(3'-butenyl)-3,4-dihydro-2H-pyrans, their synthesis and use

Organopolysiloxanes are disclosed which contain, aside from methyl groups, alkyl groups with 1 to 20 carbon atoms, aryl groups or aralkyl groups, epoxy groups which are linked over Si--C bonds to silicon atoms of the polysiloxanes, and R.sup.3 OH groups, R.sup.3 being a divalent alkylene groups with 3 to 11 carbon atoms. The organopolysiloxanes have good compatibility with photoinitiators and adhesion and release properties which can be adjusted for the intended application by coordinating the long chain alkyl groups, the epoxy groups and the --R.sup.3 OH groups.

Curable organopolysiloxanes having epoxy groups, methods of synthesizing

A (meth)acrylate ester-modified organopolysiloxane composition, which is composed of several fractions of equilibrated (meth)acrylate ester-modified organopolysiloxanes that differ in the average number of silicon atoms in the mixture of molecules, is disclosed which contains

(Meth)acrylate ester-modified organopolysiloxanes

Novel polysiloxanes with (meth)acrylate groups and monocarboxylate groups and their use as radiation-curable abhesive coating matrials are disclosed. The modified polysiloxanes adhere well to the support that is to be coated and can be cured at a high rate on the support. The cured coating has good chemical and physical stabilities and a high flexibility. The abhesive properties can be adapted to the chemical character of the adhesives, so that the desired degree of abhesiveness is obtained.

Polysiloxanes with (meth)acrylate ester groups linked over SiC groups

Optical glass fibers are provided with a primary coating of organo-polysiloxanes, containing acrylic acid ester groups, corresponding to the general formula: ##STR1## where the primary coating is free of inert components capable of migration.

Optical glass fiber with a primary coating of acrylic acid ester

A method is disclosed for coating sheet-like supports by applying curable organopolysiloxanes, which have been modified with (meth)-acrylate ester groups, on the surface of the support and curing the modified organopolysiloxanes by the action of polymerizing high-energy radiation. Polysiloxanes with hydroxy-functional groups are employed for this purpose, which are obtained by reaction with, based on the hydroxyl groups, 0.4 to 0.9 molar amounts of (meth)acrylic acid and up to 0.6 molar amounts of monocarboxylic acids, which are free of double bonds (sum of the acids.ltoreq.1 molar).

Coating composition and method for coating sheet-like supports by

The present invention is directed to an optical glass fiber with a primary coating of organo-polysiloxanes containing acrylic acid ester groups which coating is inter alia hydrolysis stable and rapidly curable.

Optical glass fiber with a primary coating of organo-polysiloxanes

Polysiloxanes with (meth)acrylate ester groups linked over SiC groups are disclosed which are obtainable by the reaction of epoxy-functional polysiloxanes of the general formula ##STR1## in which R.sup.1 are the same or different low molecular alkyl groups with 1 to 4 carbon atoms or phenyl groups,

Polysiloxanes with (meth) acrylate ester groups linked through sic

A method is disclosed for the synthesis of SiH-containing organopolysiloxanes from the corresponding Si-halogen-containing organopolysiloxanes by the reaction with metal hydrides in a liquid reaction medium. The method has the following combiniation of characteristics:

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Bottrop, Germany

Dietmar Wewers