Patents by Inventor Rudolf Stephan
Rudolf Stephan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 6367275Abstract: Method of cooling air in under-roof spaces of buildings, comprising the following steps: a) mixing water, cement, aluminium powder and a material selected from sand, gravel and the like, into a smooth mixture; b) spreading the smooth mixture over the roof to obtain a uniform layer of porous concrete; c) drying the layer; and d) soaking the layer with water.Type: GrantFiled: January 26, 1999Date of Patent: April 9, 2002Assignee: Luigi RivaInventor: Rudolf Stephan
-
Patent number: 4788253Abstract: The invention relates to a thermoplastic molding material of an elastomeric polymer A, a shell B grafted to the polymer A, and a copolymer C as rigid matrix. The amount of polymer A is 1 to 25 percent by weight based on the weight of A+B+C. It has a glass transition temperature, Tg, of less than 0.degree. C. and an average particle size of 200 to 750 nanometers (d.sub.50 value of the integral mass distribution) and is composed of: 50 to 99.9 percent by weight of at least one alkylacrylate with 1 to 8 carbon atoms in the alkyl radical and 0.1 to 5 percent by weight of a polyfunctional monomer which has a crosslinking action. Grafting shell B represents 5 to 40 percent by weight based on A+B+C and is composed of at least one of the monomers of the group of(b.sub.1) vinylaromatic monomers, and(b.sub.2) the ethylenically unsaturated monomers.Grafting shell B is prepared in two stages with 30 to 70 percent by weight of the monomers b.sub.Type: GrantFiled: April 17, 1987Date of Patent: November 29, 1988Assignee: BASF AktiengesellschaftInventors: Juergen Hambrecht, Burghard Schmitt, Johann Swoboda, Georg Wassmuth, Claus Bernhard, Rudolf Stephan
-
Patent number: 4634734Abstract: The invention relates to a thermoplastic molding material of an elastomeric polymer A, a shell B grafted to the polymer A, and a copolymer C as rigid matrix. The amount of polymer A is 1 to 25 percent by weight based on the weight of A+B+C. It has a glass transition temperature, Tg, of less than 0.degree. C. and an average particle size of 200 to 750 nanometers (d.sub.50 value of the integral mass distribution) and is composed of: 50 to 99.9 percent by weight of at least one alkylacrylate with 1 to 8 carbon atoms in the alkyl radical and 0.1 to 5 percent by weight of a polyfunctional monomer which has a crosslinking action. Grafting shell B represents 5 to 40 percent by weight based on A+B+C and is composed of at least one of the monomers of the group of(b.sub.1) vinylaromatic monomers, and(b.sub.2) the ethylenically unsaturated monomers.Grafting shell B is prepared in two stages with 30 to 70 percent by weight of the monomers b.sub.Type: GrantFiled: February 15, 1984Date of Patent: January 6, 1987Assignee: BASF AktiengesellschaftInventors: Juergen Hambrecht, Burghard Schmitt, Johann Swoboda, Georg Wassmuth, Claus Bernhard, Rudolf Stephan
-
Patent number: 4468353Abstract: An improvement in the alkoxylation of a compound having a reactive methylene group by contacting said compound with an orthoformic acid trialkyl ester in the presence of a catalyst, the improvement residing in employing at least 1.6 moles of orthoformic acid ester per mole of compound having a reactive methylene group and carrying out the process in the presence of a catalyst of the group of aliphatic carboxylic acids, anhydrides of aliphatic carboxylic acids, aromatic sulphonic acids, alkali metal alcoholates and alkanolamines.Type: GrantFiled: September 30, 1982Date of Patent: August 28, 1984Assignee: Dynamit Nobel AGInventors: Otto Ackermann, Dieter Bretzinger, Herbert Schneidewind, Rudolf Stephan
-
Patent number: 4442263Abstract: Thermoplastic molding materials contain a copolymer A and a graft copolymer B. The copolymer A is a hard component comprising one or more copolymers of styrene and/or .alpha.-methylstyrene with from 20 to 40% by weight of acrylonitrile.The graft copolymer B comprises one or more crosslinked acrylate polymer with a mean particle size of 0.5-0.8 .mu.m (d.sub.50 value of the cumulative mass distribution), a particle distribution, expressed by the ratio ##EQU1## in the range Q.gtoreq.0.6, and a glass transition temperature Tg below 0.degree. C. A mixture of styrene and acrylonitrile in a weight ratio from 88:12 to 65:35 is grafted onto this rubber.Type: GrantFiled: July 16, 1982Date of Patent: April 10, 1984Assignee: BASF AktiengesellschaftInventors: Franz Brandstetter, Juergen Hambrecht, Rudolf Stephan, Heinz-Juergen Overhoff, Josef Schwaab, Claus Bernhard, Johann Swoboda, Adolf Echte
-
Patent number: 4433102Abstract: A thermoplastic molding material contains 50-90% by weight of a hard component A comprising one or more copolymers of styrene and/or .alpha.-methylstyrene with acrylonitrile, and 50-10% by weight of a graft copolymer B comprising 40-80% by weight of a crosslinked acrylate polymer which has a mean particle size greater than 0.8 .mu.m (d.sub.50 value of the cumulative mass distribution) and onto which 20-60% by weight of a mixture of styrene and acrylonitrile in a weight ratio of from 88:12 to 65:35 is grafted.The novel molding material is used for the production of moldings.Type: GrantFiled: July 19, 1982Date of Patent: February 21, 1984Assignee: BASF AktiengesellschaftInventors: Franz Brandstetter, Juergen Hambrecht, Rudolf Stephan
-
Patent number: 4393164Abstract: Transparent, impact-resistant thermoplastic molding materials produced from a rigid methylmethacrylate polymer A, a rigid styrene-acrylonitrile polymer B and a flexible graft copolymer C, made from grafting an alkylmethacrylate and optionally styrene onto a rubber grafting base.Type: GrantFiled: March 26, 1982Date of Patent: July 12, 1983Assignee: BASF AktiengesellschaftInventors: Graham E. McKee, Franz Haaf, Juergen Hambrecht, Klaus Benker, Rudolf Stephan, Hans Breuer
-
Patent number: 4277418Abstract: An improvement in the alkoxylation of a compound having a reactive methylene group by contacting said compound with an orthoformic acid trialkyl ester in the presence of a catalyst, the improvement residing in employing at least 1.6 moles of orthoformic acid ester per mole of compound having a reactive methylene group and carrying out the process in the presence of a catalyst of the group of aliphatic carboxylic acids, anhydrides of aliphatic carboxylic acids, aromatic sulphonic acids, alkali metal alcoholates and alkanolamines.Type: GrantFiled: February 26, 1979Date of Patent: July 7, 1981Assignee: Dynamit Nobel AktiengesellschaftInventors: Otto Ackermann, Dieter Bretzinger, Herbert Schneidewind, Rudolf Stephan
-
Patent number: 4200702Abstract: Thermoplastic molding compositions based on rubber-modified styrene-acrylonitrile copolymers containing a halogenated styrene oligomer as the effective flame-proofing agent which is sufficiently heat-stable, does not interfere with processing on conventional machinery, does not corrode or cause coatings on such machinery, and has virtually no adverse effect on the impact strength of the polymers. The flameproofing agent as a rule has a degree of polymerization of from 3 to 200 and can be incorporated into the polymer by conventional methods; the polymer may or may not contain additional synergistic agents and processing auxiliaries, which are incorporated in the conventional manner and in the conventional amounts.Type: GrantFiled: June 5, 1978Date of Patent: April 29, 1980Assignee: BASF AktiengesellschaftInventors: Hermann Gausepohl, Herbert Naarmann, Klaus Penzien, Rudolf Stephan
-
Patent number: 4104328Abstract: Impact-resistant thermoplastic molding compositions having a hard component comprising a styrene/acrylonitrile copolymer and a soft component comprising a graft copolymer of styrene and acrylonitrile on a rubbery polymer containing butadiene. The rubbery polymer serving as base for the graft copolymer is produced by polymerization or the monomer of monomers forming said polymer in aqueous emulsion and in the presence of a small amount of an alkanol of from 1 to 4 carbon atoms. The compositions have improved color and color stability and may be processed by conventional methods to form shaped articles.Type: GrantFiled: January 5, 1976Date of Patent: August 1, 1978Assignee: BASF AktiengesellschaftInventors: Johann Swoboda, Rudolf Stephan, Gerhard Heinz
-
Patent number: 4080393Abstract: A method for rectifying chlorinated hydrocarbon to removed therefrom substances which discolor or tarnish metals by contacting the chlorinated hydrocarbon with a compound which is an alkanolamine, morpholine, an N C.sub.1-8 alkyl morpholine, hexamethyleneimine or a mixture thereof and thereafter water washing the so contacted chlorinated hydrocarbon.Type: GrantFiled: October 1, 1976Date of Patent: March 21, 1978Assignee: Dynamit Nobel AktiengesellschaftInventors: Kurt Deselaers, Rudolf Stephan
-
Patent number: 4069265Abstract: A stabilized 1,1,1-trichloroethane composition containing, as stabilizer therefor, a mixture consisting of a nitrile, 1,4-dioxane, and nitromethane.Type: GrantFiled: March 1, 1976Date of Patent: January 17, 1978Assignee: Dynamit Nobel AktiengesellschaftInventors: Hermann Richtzenhain, Rudolf Stephan
-
Patent number: 3959397Abstract: A stabilized 1,1,1-trichloroethane composition containing, as stabilizer therefor, a mixture consisting of a nitrile, 1,4-dioxane, and nitromethane.Type: GrantFiled: October 23, 1973Date of Patent: May 25, 1976Assignee: Dynamit Nobel AktiengesellschaftInventors: Hermann Richtzenhain, Rudolf Stephan