Patents Assigned to Huels Silicone GmbH
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Patent number: 6069220Abstract: A continuous method for producing polyorganosiloxanes by multiple-step hydrolysis and condensation of alkoxysilanes in the presence of hydrogen chloride and/or of a compound that has at least one SiCl group, and an organic solvent immiscible with water.Type: GrantFiled: January 4, 1999Date of Patent: May 30, 2000Assignee: Huels Silicone GmbHInventors: Sabine Hoffmann, Klaus Kaeppler
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Patent number: 6018011Abstract: The present invention relates to a polyorganosiloxane having at least one dialkoxyorganosiloxy group, where the organo radical is a substituted amidoalkyl radical.Type: GrantFiled: June 17, 1998Date of Patent: January 25, 2000Assignee: Huels Silicone GmbHInventors: Uwe Scheim, Peter Jenkner, Robert Lehnert
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Patent number: 5973057Abstract: Deaggregated highly disperse silicic acid, in which the average particle size is less than 100 nm, preferably less than 50 nm, is prepared by extremely high mechanical stress. The deaggregated silicic acid is employed as a filler in silicone rubber mixtures.Type: GrantFiled: December 22, 1997Date of Patent: October 26, 1999Assignee: Huels Silicone GmbHInventors: Peter Schoeley, Ralf Winkler, Harald Schickmann
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Patent number: 5969057Abstract: Adhesive room temperature vulcanizing silicone rubber compositions based on polydiorganosiloxanes, which cross-link by means of condensation are good adhesives. The compounds contain, in addition to the conventional components, the combination of at least one hydrolyzable alkylsilalne and at least one branched polysiloxane.Type: GrantFiled: April 28, 1997Date of Patent: October 19, 1999Assignee: Huels Silicone GmbHInventors: Peter Schoeley, Gisela Liesch, Cornelia Sczepanski, Ulrich Michel
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Patent number: 5919883Abstract: The invention relates to a process for preparing polyorganosiloxanes which comprise substantially no cyclic components and have uniform molecular weight distribution by reacting organosilicon compounds which have no condensable groups in the presence of a catalyst which exclusively promotes equilibration and suppresses formation of cyclic components. The resulting polyorganosiloxanes have a linear or branched structure. They can either be used immediately, for example in silicone rubbers and silicone greases, as components in release agents, in impregnating agents, in antifoams, etc., or are starting compounds for preparing organofunctionally modified polysiloxanes which are obtained by hydrosilylation of the polyorganosiloxanes with hydrocarbons and/or organic polymers.Type: GrantFiled: August 15, 1997Date of Patent: July 6, 1999Assignee: Huels Silicone GmbHInventors: Uwe Dittrich, Holger Rautschek, Harald Schickmann
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Patent number: 5773548Abstract: The invention relates to a catalyst for preparing organosiloxanes and polyorganosiloxanes which are obtained primarily by polycondensation processes. The catalyst of the invention is a reaction product of phosphonitrilic chloride with a compound of the general formula ?R.sub.3 SiO(R.sub.2 SiO).sub.m !.sub.3 P.dbd.O (I), where R are, independently of one another, identical or different, unsaturated and/or saturated monovalent hydrocarbon radicals having from 1 to 6 carbon atoms or hydrogen, with the proviso that only one hydrogen atom is bound to each silicon atom and m has a value between 0 and 1000. Volatile chlorine-containing silicon compounds formed during the reaction can, if required, be completely or partially removed.Type: GrantFiled: January 11, 1996Date of Patent: June 30, 1998Assignee: Huels Silicone GmbHInventors: Harald Schickmann, Robert Lehnert, Heinz-Dieter Wendt, Holger Rautschek, Harald Roesler, Hans-Guenther Srebny
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Patent number: 5741839Abstract: Storage-stable, alkoxy-crosslinking RTV1 systems that contain carbodiimides as stabilizers.Type: GrantFiled: May 2, 1996Date of Patent: April 21, 1998Assignee: Huels Silicone GmbHInventor: Uwe Scheim
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Patent number: 5708113Abstract: The invention relates to catalysts for the preparation and processing of polyorganosiloxanes, in particular for processing silicone resins, for example for solvent-free production of mica insulating materials. The catalysts are silanized organometallic compounds.Type: GrantFiled: January 23, 1997Date of Patent: January 13, 1998Assignee: Huels Silicone GmbHInventors: Gunter Beuschel, Holger Rautschek, Gisela Liesch
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Patent number: 5674938Abstract: Liquid polysiloxanes are used in defoamant preparations, as diffusion-resistant plasticizer oils, separation agents, or impregnation agents. The liquid polysiloxanes are obtained by reacting:(1) 100 parts by weight of the hydrolysis product of dimethyldichlorosilane having a viscosity of less than 200 mm.sup.2 /sec at 25.degree. C.;(2) 1-100 parts by weight of a polydiorganosiloxane having a viscosity of less than 200 mm.sup.2 /sec at 25.degree. C., of formula (I)R.sup.3.sub.c SiO.sub.(4-c)/2, (I)where each R.sup.3 is independently a substituted or unsubstituted hydrocarbon group with 1-30 carbon atoms, and c has mean value 1.9-3.0; and(3) 0.1-20 parts by weight of one or more compounds (a)-(d),where (a) is a silicon compound of formula (II)R.sup.4.sub.d SiX.sub.(4-d), (II)where R.sup.Type: GrantFiled: December 13, 1994Date of Patent: October 7, 1997Assignee: Huels Silicone GmbHInventors: Holger Rautschek, Rosemarie Guehne, Harald Schickmann
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Patent number: 5561209Abstract: A process for preparing polyorganosiloxanes having a viscosity ranging from 0.2 to 10,000 Pas (at 20.degree. C.) by reaction of low molecular polyorganosiloxanols with each other or with oligomeric siloxanes in the presence of a catalyst system in a thin layer evaporator is disclosed. These products are silicone oils and silicone rubber polymers or starting materials for further modifications. The process is carried out at temperatures ranging from 80.degree. to 200.degree. C. and pressures ranging from 1 to 1000 mbar (abs.). The advantages include prevention of recycling through milder reaction conditions and reduction in the accumulation of intermediate fractions during product conversions.Type: GrantFiled: June 7, 1995Date of Patent: October 1, 1996Assignee: Huels Silicone GmbHInventors: Wolf Pieschnick, Harald Schickmann, Dieter Behnisch