Patents by Inventor Fritz Engelhardt
Fritz Engelhardt 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).
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Patent number: 6657015Abstract: Liquid-absorbent polymers are prepared by a process for the gel and/or surface postcrosslinking of water-absorbent polymers by the polymer being treated with a surface postcrosslinking solution and being postcrosslinked and dried during and after the treatment by raising the temperature, wherein the crosslinker comprises a compound of the formula I where R1 is hydrogen, C1-C4-alkyl, C1-C4-hydroxyalkyl, trialkylsilyl or acetyl and R2, R2′, R3, R3′, R4, R4′ are each independently hydrogen, C1-C12-alkyl, C2-C12-alkenyl or C6-C12-aryl, dissolved in an inert solvent, and are used in hygiene articles, packaging materials and nonwovens.Type: GrantFiled: May 17, 2001Date of Patent: December 2, 2003Assignee: BASF AktiengesellschaftInventors: Ulrich Riegel, Matthias Weismantel, Volker Frenz, Thomas Daniel, Fritz Engelhardt
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Patent number: 6565768Abstract: Water-swellable hydrophilic polymers are prepared by neutralization of the acidic hydrogel having a degree of neutralization of 0-40 mol % to an ultimate degree of neutralization of 60-85 mol % by mixing with a neutralizing agent in a mincer comprising a system of screw, rotating blade, restricted flow zone and breaker plate, wherein the mincer has a power output of from 1000 to 6000 Wh/m3 the hydrogel passes through a zone having-an energy dissipation density of from 400 to 800 W/1 of mixing volume the average residence time of the hydrogel in the mincer is from 5 to 30 seconds the breaker plate has an open area of from 20 to 40%.Type: GrantFiled: April 6, 2001Date of Patent: May 20, 2003Assignee: BASF AktiengesellschaftInventors: Joachim Dentler, Norbert Herfert, Rudolf Schliwa, Uwe Stüven, Fritz Engelhardt
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Patent number: 6559239Abstract: Liquid-absorbent polymers are prepared by a process for the gel and/or surface postcrosslinking of water-absorbent polymers by the polymer being treated with a surface postcrosslinking solution and being postcrosslinked and dried during and after the treatment by raising the temperature, wherein the surface postcrosslinking solution comprises as crosslinker a compound of the formula I where R1, R2, R3 and R4 are independently hydrogen, C1-C12-alkyl, C1-C12-alkenyl, C6-C12-aryl or C1-C12-alkoxy, R5 is C1-C16-alkyl, C1-C4-hydroxyalkyl, C6-C12-aryl, C1-C16-alkenyl or a group of the formula —(CH2)n—COOH or —(CH2)n—SO3H in the form of the acid or a respective metal salt, ammonium salt or triethanolammonium salt thereof or —(CH2—CH2—O—)m—R6, R6 is hydrogen or C1-C16-alkyl, n is from 1 to 10, m is from 1 to 20 dissolved in an inert solvent, and are used in hygiene articles, packaging materials and nonwovens.Type: GrantFiled: May 29, 2001Date of Patent: May 6, 2003Assignee: BASF AktiengesellschaftInventors: Ulrich Riegel, Matthias Weismantel, Volker Frenz, Thomas Daniel, Fritz Engelhardt
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Publication number: 20030045847Abstract: Absorbent articles and processes for making absorbent articles are provided. The process includes spraying onto a fibrous web a blend containing superabsorbent polymer particles, superabsorbent forming monomer, initiator and water, and subjecting the web to polymerization conditions. The resulting web is useful as an absorbent article particularly in disposable hygiene products.Type: ApplicationFiled: March 23, 2002Publication date: March 6, 2003Inventors: Darryl L. Whitmore, Fritz Engelhardt
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Patent number: 6503979Abstract: The invention contains a process for the surface postcrosslinking of water-absorbing polymers in which the polymers are treated with a surface postcrosslinking solution and during or after the treatment are postcrosslinked by means of an increase in temperature and are dried, wherein the crossiinker comprises a bis-2-oxazolidinone or a poly-2-oxazolidinone comprising structural units of the formula in which R1 is branched or unbranched C1-C18-alkylene, branched or unbranched C2-C18-alkenylene, C5-C18-cycloalkylene, phenylene, naphthylene, anthracenylene, hydrocarbon-substituted phenylene, naphthylene or anthracenylene or another substituted or unsubstituted C6-C18-arylene radical, R2 is branched or unbranched C1-C18-alkylene and n is an integer from 1 to 50 or a mixture of bis-2-oxazolidinones and poly-2-oxazolidinones dissolved in an inert solvent.Type: GrantFiled: August 28, 2000Date of Patent: January 7, 2003Assignee: BASF AktiengesellschaftInventors: Rüdiger Funk, Volker Frenz, Ulrich Riegel, Matthias Weismantel, Fritz Engelhardt, Thomas Daniel
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Patent number: 6472478Abstract: The invention relates to a process for the gel or surface postcrosslinking of water-absorbing polymers in which the polymers are treated with a surface postcrosslinking solution and during or after the treatment are postcrosslinked and dried by means of an increase in temperature, the crosslinker being a compound of the formula in which R1 and R2 independently of one another are H, hydroxyl, phenyl or C1-C6-alkyl, R3 is hydrogen, C1-C12-alkyl, C1-C12-alkenyl or C6-C12-aryl and R4 and R5 independently of one another are C1-C12-alkyl, C1-C12-alkenyl, C6-C12-aryl, hydroxyl, C1-C12-alkoxy or hydrogen, dissolved in an inert solvent, to water-absorbing polymers which can be obtained by said process, and to their use in hygiene articles, packaging materials and nonwovens.Type: GrantFiled: August 18, 2000Date of Patent: October 29, 2002Assignee: BASF AktiengesellschaftInventors: Rüdiger Funk, Volker Frenz, Ulrich Riegel, Matthias Weismantel, Fritz Engelhardt, Thomas Daniel
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Patent number: 6417425Abstract: Absorbent articles and processes for making absorbent articles are provided. The process includes spraying onto a fibrous web a blend containing superabsorbent polymer particles, superabsorbent forming monomer, initiator and water, and subjecting the web to polymerization conditions. The resulting web is useful as an absorbent article particularly in disposable hygiene products.Type: GrantFiled: February 1, 2000Date of Patent: July 9, 2002Assignee: BASF CorporationInventors: Darryl L. Whitmore, Fritz Engelhardt
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Patent number: 6297335Abstract: The hydrogels are based on polymerized monomers or on graft polymers and each have a Pressure Absorbency Index <100 and a vertical absorption of not less than 12 g/g under a pressure of 1922.8 Pa.Type: GrantFiled: February 5, 1999Date of Patent: October 2, 2001Assignee: BASF AktiengesellschaftInventors: Rüdiger Funk, Norbert Herfert, Mariola Wanior, Patricia D. Brown, Fritz Engelhardt, Guy T. Woodrum
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Patent number: 6150477Abstract: The present invention relates to a process for the preparation of hydrophilic hydrogels of high swelling capacity by (co)polymerization of hydrophilic monomers in a fluidized bed apparatus.Type: GrantFiled: June 23, 1997Date of Patent: November 21, 2000Assignee: Hoechst AktiengesellschaftInventors: Fritz Engelhardt, Manfred Mayer, Uwe Nickel
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Patent number: 6107432Abstract: The present invention relates to water-swellable, hydrophilic polymer compositions which can be prepared by free-radical (co)polymerization of one or more hydrophilic monomers in the presence of starch and/or chemically modified starch, wherein a free-radical initiator which forms three or more free radical sites per molecule is used.Type: GrantFiled: May 26, 1998Date of Patent: August 22, 2000Assignee: BASF AGInventors: Fritz Engelhardt, Rudiger Funk, Norbert Herfert, Matthias Weismantel
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Patent number: 5945495Abstract: The present invention relates to the use of surfactants for improving the drying properties of hydrophilic, highly swellable hydrogels in the course of drying with the aid of contact dryers.Type: GrantFiled: January 17, 1997Date of Patent: August 31, 1999Assignee: BASF CorporationInventors: Thomas Daniel, Norbert Herfert, Gustav Remmel, Ulrich Riegel, Uwe Stuven, Fritz Engelhardt
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Patent number: 5840321Abstract: The present invention relates to hydrophilic, highly swellable hydrogels which are coated with nonreactive, water-insoluble waxes in a quantity of from about 0.05 to about 2% by weight, based on uncoated hydrogel.Type: GrantFiled: July 8, 1996Date of Patent: November 24, 1998Assignee: Clariant GmbHInventors: Fritz Engelhardt, Uwe Stuven, Thomas Daniel, Norbert Herfert
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Patent number: 5792880Abstract: The present Application relates to a process for the preparation of N-lauroyl-L-glutamic acid di-n-butylamide by reaction of N-lauroyl-L-glutamic acid dimethyl ester with n-butylamine in the presence of a hydrocarbon or hydrocarbon mixture as an auxiliary solvent.Type: GrantFiled: March 13, 1997Date of Patent: August 11, 1998Assignee: Hoechst AktiengesellschaftInventors: Fritz Engelhardt, Manfred Muller, Michael Wessling
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Patent number: 5731365Abstract: The present invention relates to hydrophilic, highly swellable hydrogels which are coated with non-reactive, water-insoluble film-forming polymers.Type: GrantFiled: July 19, 1995Date of Patent: March 24, 1998Assignee: Hoechst AGInventors: Fritz Engelhardt, Norbert Herfert, Uwe Stuven, Ulrich Riegel, Rudiger Funk, Detlev Seip
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Patent number: 5726331Abstract: The present invention relates to a process for the preparation of dimethyl N-lauroyl-L-glutamate by reaction of N-lauroyl-L-glutamic acid with methanol in the presence of trimethyl orthoformate.Type: GrantFiled: November 21, 1996Date of Patent: March 10, 1998Assignee: Hoechst AktiengesellschaftInventors: Fritz Engelhardt, Manfred Muller, Michael Wessling
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Patent number: 5684104Abstract: Method for avoiding network defects due to unwanted secondary reactions during the polymerization in water-swellable hydrophilic polymers which contain polymers prepared by free radical (co)polymerization of one or more hydrophilic monomers of the formula I ##STR1## wherein R.sup.1 is hydrogen, methyl or ethyl,R.sup.2 is the group --COOR.sup.4, the sulphonyl group, the phosphonyl group, the phosphonyl group-esterified by (C.sub.1 -C.sub.4)-alkanol or a group of the formula ##STR2## R.sup.3 is hydrogen, methyl, ethyl or the carboxyl group, R.sup.4 is hydrogen, amino or hydroxy-(C.sub.1 -C.sub.4)-alkyl andR.sup.5 is the sulphonyl group, the phosphonyl group or the carboxyl group, or grafting (co)polymerization of one or more hydrophilic monomers of the formula I onto a grafting base, using a free radical initiator which forms three or more free radical sites per molecule.Type: GrantFiled: July 18, 1996Date of Patent: November 4, 1997Assignee: CassellaInventors: Rudiger Funk, Fritz Engelhardt, Ulrich Riegel, Michael Wessling
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Patent number: 5668236Abstract: The present invention relates to a hydrophilic highly swellable hydrogel based on (co)polymerized hydrophilic monomers or based on graft (co)polymers, characterized in that it is post-crosslinked with a polyamidoamine in an aqueous medium.Type: GrantFiled: April 29, 1996Date of Patent: September 16, 1997Assignee: Cassella AktiengesellschaftInventors: Fritz Engelhardt, Ulrich Riegel, Uwe Stuven, Helmut Klotzsche, Gustav Remmel
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Patent number: 5594083Abstract: Water-swellable hydrophilic polymers which contain polymers prepared by free radical (co)polymerization of one or more hydrophilic monomers of the formula I ##STR1## wherein R.sup.1 is hydrogen, methyl or ethyl,R.sup.2 is the group --COOR.sup.4, the sulphonyl group, the phosphonyl group, the phosphonyl group esterified by (C.sub.1 -C.sub.4)-alkanol or a group of the formula ##STR2## R.sup.3 is hydrogen, methyl, ethyl or the carboxyl group, R.sup.4 is hydrogen, amino or hydroxy-(C.sub.1 -C.sub.4)-alkyl andR.sup.5 is the sulphonyl group, the phosphonyl group or the carboxyl group, or grafting (co)polymerization of one or more hydrophilic monomers of the formula I onto a grafting base, using a free radical initiator which forms three or more free radical sites per molecule.Type: GrantFiled: March 22, 1995Date of Patent: January 14, 1997Assignee: Cassella AktiengesellschaftInventors: R udiger Funk, Fritz Engelhardt, Ulrich Riegel, Michael Wessling
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Patent number: 5571764Abstract: The present invention relates to absorbents for water and aqueous solutions, in particular for blood, which contain a product from the tuber of a plant from the family of the Araceae.Type: GrantFiled: January 16, 1996Date of Patent: November 5, 1996Assignee: Cassella AktiengesellschaftInventors: Rainer Greve, Gerlinde Ebert, Ulrich Riegel, Fritz Engelhardt
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Patent number: 5530093Type: GrantFiled: January 30, 1995Date of Patent: June 25, 1996Assignee: Cassella AktiengesellschaftInventors: Fritz Engelhardt, Willi Steckelberg, Karl-Heinz Keil, Ralf Zerrer