Patents by Inventor David Christie
David Christie 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: 6852821Abstract: Aqueous primary dispersions and coating materials comprising dispersed and/or emulsified, solid and/or liquid polymer particles and/or dispersed solid core-shell particles having a diameter?500 nm preparable by controlled free-radical microemulsion or miniemulsion polymerization of A) at least one olefinically unsaturated monomer and B) at least one olefinically unsaturated monomer which is different than the olefinically unsaturated monomer (A) and has the general formula I: R1R2C?CR3R4 (I), in which the radicals R1, R2, R3 and R4 independently of one another are hydrogen atoms or substituted or unsubstituted alkyl, cycloalkyl, alkylcycloalkyl, cycloalkylalkyl, aryl, alkylaryl, cycloalkylaryl, arylalkyl or arylcycloalkyl radicals, with the proviso that at least two of the variables R1, R2, R3 and R4 are substituted or unsubstituted aryl, arylalkyl or arylcycloalkyl radicals, especially substituted or unsubstituted aryl radicals; and also their use.Type: GrantFiled: November 8, 2000Date of Patent: February 8, 2005Assignee: BASF Coatings AGInventors: Maximilian Bendix, Wolfgang Bremser, David Christie
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Patent number: 6815498Abstract: A process for the preparation of a reaction product (A), which comprises the following stage (i): (i) Reaction, under free radical conditions, of a reaction mixture comprising at least one monomer (a), capable of free radical reaction in the presence of at least one free radical initiator and a compound of the formula (I) where R1 to R4, independently of one another, are each hydrogen, an alkyl radical, cycloalkyl radical or aralkyl radical, each of which is unsubstituted or substituted, an unsubstituted or substituted aromatic hydrocarbon radical, with the proviso that at least two of the radicals R1 to R4 are an unsubstituted or substituted aromatic hydrocarbon radical, or R1 and R2 or R3 and R4, in each case in pairs, are a substituted or unsubstituted aromatic hydrocarbon having 6 to 18 carbon atoms and a functional group which, in conjugation with the C—C double bond in the formula I, has a multiple bond between a carbon atom and a heteroatom, 10% by weight or less of wateType: GrantFiled: June 13, 2002Date of Patent: November 9, 2004Assignee: BASF AktiengesellschaftInventors: Roman Benedikt Raether, Bernd Modery, Frank Braun, Susanne Brinkmann-Rengel, David Christie, Sylke Haremza
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Patent number: 6809165Abstract: A process for the preparation of polymers is described, wherein at least one first ethylenically unsaturated monomer is subjected to a free radical polymerization in the presence of stable free radicals or sources of stable free radicals and of a compound having at least one free thiol group to give a polymer, and wherein the molar ratio of compound having a free thiol group to stable free radicals is from 0.05 to 1.1. The polymerization rate is substantially increased by the compound having a free thiol group.Type: GrantFiled: September 27, 2002Date of Patent: October 26, 2004Assignee: BASF AktiengesellschaftInventors: David Christie, Sylke Haremza, Susanne Brinkmann-Rengel, Roman Benedikt Raether
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Patent number: 6794436Abstract: The present invention relates to a solvent-free pigmented formulation comprising I) a binder based on at least one copolymer P in an aqueous polymer dispersion obtainable by free-radical aqueous emulsion polymerization of a monomer mixture containing a) from 45 to 69.95% by weight of at least one monomer a) whose homopolymer has a glass transition temperature Tg of less than 20° C., b) from 30 to 54.95% by weight of at least one monomer b) whose homopolymer has a glass transition temperature Tg of more than 50° C., c) from 0.05 to 1.5% by weight of itaconic acid and/or its anhydride and/or its salts, as acidic monomer c), and d) from 0 to 2% by weight of at least one further monomer d), the sum of the % by weight of a) to d) being 100% by weight, II) at least one pigment, III) at least one pigment dispersant having an acid number to DIN 53402 of less than 600, IV) if desired, an inorganic filler, and V) customary auxiliaries.Type: GrantFiled: May 6, 2002Date of Patent: September 21, 2004Assignee: BASF AktiengesellschaftInventors: Bernhard Schlarb, Rolf Dersch, David Christie, Franz Weingart
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Patent number: 6747102Abstract: In a process for the free radical-initiated aqueous emulsion polymerization for the preparation of an aqueous polymer dispersion, ethylenically unsaturated monomers are polymerized by means of a free radical polymerization initiator in the presence of organometallic compounds having a controlling effect.Type: GrantFiled: October 1, 2001Date of Patent: June 8, 2004Assignee: BASF AktiengesellschaftInventors: David Christie, Jerome Claverie, Saba Kanagasabapathy
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Patent number: 6716905Abstract: The invention relates to a coating agent, containing at least one conversion product (A) and at least one suitable additive (C), (A) being produced according to a method comprising the following step (i): (iv) reacting a reaction mixture comprising at least one radically convertible monomer in radical conditions, (a) in the presence of at least one radical initiator and a compound (I) of formula (II) wherein R1 to R4 each represent, independently of each other, hydrogen, an unsubstituted or substituted alkyl radical, cycloalkyl radical or aralkyl radical or an unsubstituted or a substituted aromatic hydrocarbon radical, on the condition that at least two of R1 to R4 represent an unsubstituted or a substituted aromatic hydrocarbon radical, in an aqueous phaseType: GrantFiled: June 21, 2001Date of Patent: April 6, 2004Assignees: Coatings AG, BASF AktiengesellschaftInventors: Wolfgang Bremser, Frank Strickmann, Maximilian Bendix, Wolfgang Paulus, Roman Benedikt Raether, David Christie
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Patent number: 6639033Abstract: The present invention provides a process for the free radical polymerization of one or more ethylenically unsaturated monomers, said process comprising polymerizing one or more ethylenically unsaturated monomers in the presence of one or more N-oxyl radicals of formula II, wherein X is S, NR5, O, SO or SO2, R5 is C1-C20-alkyl or C5-C8-cycloalkyl and R3 and R4 independently of one another, are C1-C4-alkyl, phenyl, naphthyl or an aromatic five-membered ring, or R3 and R4 together are —(CH2)o— and p and o, independently of one another, are an integer from 2 to 7.Type: GrantFiled: February 19, 2002Date of Patent: October 28, 2003Assignee: BASF AktiengesellschaftInventors: Susanne Brinkmann-Rengel, Sylke Haremza, Heinz Friedrich Sutoris, David Christie, Roman Benedikt Raether, Jizhuang Cao
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Patent number: 6593421Abstract: An aqueous composition containing from 1 to 60% by weight of a polymer A) built up from a) from 10 to 50% by weight of a vinylaromatic having up to 20 carbon atoms, b) from 45 to 75% by weight of a nonaromatic hydrocarbon having two conjugated double bonds, c) from 0 to 20% by weight of a water-soluble monomer having a water solubility of at least 100 g per liter of water under standard conditions (21° C. and 1 bar), the water-soluble monomer containing no acid group or acid anhydride group, d) from 0.1 to 4.5% by weight of a monomer containing at least one acid group or acid anhydride group, e) from 0 to 30% by weight of a monomer other than a) to d), and from 40 to 99% by weight of a filler B), the weight data for A) and B) being based on the sum of A) and B).Type: GrantFiled: October 22, 2001Date of Patent: July 15, 2003Assignee: BASF AktiengesellschaftInventors: David Christie, Joachim Pakusch, Eckehardt Wistuba, Horst Seibert, Peter Fickeisen
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Patent number: 6573329Abstract: Microsuspension polymers are prepared by (1) dispersing a mixture of components A1 to A4, a1: from 0.1 to 60% by weight of at least one free-radically polymerizable monomer A1 containing at least one functional group which is reactive with isocyanate groups (isocyanate-reactive functional group), a2: from 40 to 99.9% by weight of at least one further free-radically polymerizable monomer A2 containing no isocyanate-reactive functional group, a3: from 0 to 20% by weight of 1,1-diphenylethene or 1,1-diphenylethane A3, a4: from 0.1 to 100% by weight of at least one blocked polyisocyanate A4, in water using a protective colloid to form a dispersion having an average particle diameter of from 0.08 to 100 &mgr;m, and (2) polymerizing the droplets using from 0.1 to 20% by weight of at least one free-radical polymerization initiator, up to a conversion of at least 50% by weight, the amounts being based on the total weight of components A1 and A2, which gives 100% by weight.Type: GrantFiled: June 5, 2001Date of Patent: June 3, 2003Assignee: BASF AktiengesellschaftInventors: Graham Edmund Mc Kee, Maximilian Bendix, Peter Barghoorn, David Christie
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Publication number: 20030078338Abstract: The present invention relates to a solvent-free pigmented formulation comprisingType: ApplicationFiled: May 6, 2002Publication date: April 24, 2003Applicant: BASF AkiengesellschaftInventors: Bernhard Schlarb, Rolf Dersch, David Christie, Franz Weingart
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Publication number: 20030073793Abstract: A process for the preparation of polymers is described, wherein at least one first ethylenically unsaturated monomer is subjected to a free radical polymerization in the presence of stable free radicals or sources of stable free radicals and of a compound having at least one free thiol group to give a polymer, and wherein the molar ratio of compound having a free thiol group to stable free radicals is from 0.05 to 1.1.Type: ApplicationFiled: September 27, 2002Publication date: April 17, 2003Inventors: David Christie, Sylke Haremza, Susanne Brinkmann-Regel, Roman Benedikt Raether
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Publication number: 20030068478Abstract: In paper coating slips containing, as a binder, a copolymer which is obtainable by free radical polymerization of ethylenically unsaturated compounds, at least one of the ethylenically unsaturated compounds is a polymer having at least one copolymerizable ethylenically unsaturated group, a number average molecular weight of from 500 to 50000 g/mol and at least one carboxyl group (referred to below as ethylenically unsaturated polymer for short).Type: ApplicationFiled: September 30, 2002Publication date: April 10, 2003Inventors: Volker Schadler, David Christie, Roland Ettl
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Patent number: 6511744Abstract: A pressure sensitive adhesive is based on a polymer having a glass transition temperature ≦10° C. and obtained by free-radically initiated polymerization of ethylenically unsaturated monomers in a liquid medium in the presence of >0 and ≦5% by weight, based on the overall amount of the ethylenically unsaturated monomers used for the polymerization, of at least one oligomeric compound itself obtained by free-radically initiated polymerization of ethylenically unsaturated monomers.Type: GrantFiled: February 15, 2001Date of Patent: January 28, 2003Assignee: BASF AktiengesellschaftInventors: Alexander Centner, David Christie
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Publication number: 20030018137Abstract: A process for the preparation of a reaction product (A), which comprises the following stage (i):Type: ApplicationFiled: June 13, 2002Publication date: January 23, 2003Inventors: Roman Benedikt Raether, Bernd Modery, Frank Braun, Susanne Brinkmann-Rengel, David Christie, Sylke Haremza
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Patent number: 6506836Abstract: A process for preparing a reaction product (A), comprising the following stage (i): (i) reacting under free-radical conditions a reaction mixture comprising at least one free-radically reactable monomer (a) in the presence of at least one free-radical initiator and of a compound (I) of the formula: in which R1 to R4 each independently of one another are hydrogen, a substituted or unsubstituted alkyl radical, cycloalkyl radical or arakyl radical, or an unsubstituted or a substituted aromatic hydrocarbon radical, with the proviso that at least two of R1 to R4 are an unsubstituted or a substituted aromatic hydrocarbon radical in aqueous phase.Type: GrantFiled: July 30, 2001Date of Patent: January 14, 2003Assignees: BASF Aktiengesellschaft, BASF Coating AGInventors: Wolfgang Bremser, Frank Strickmann, Maximilian Bendix, Wolfgang Paulus, Roman Benedikt Raether, David Christie
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Publication number: 20020193505Abstract: Microsuspension polymers are prepared byType: ApplicationFiled: June 5, 2001Publication date: December 19, 2002Inventors: Graham Edmund McKee, Maximilian Bendix, Peter Barghoorn, David Christie
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Publication number: 20020137830Abstract: An aqueous composition containing from 1 to 60% by weight of a polymer A) built up fromType: ApplicationFiled: October 22, 2001Publication date: September 26, 2002Applicant: BASF AktiengesellschaftInventors: David Christie, Joachim Pakusch, Eckehardt Wistuba, Horst Seibert, Peter Fickeisen
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Publication number: 20020065827Abstract: The present invention provides the ability to use an existing store-and-forward messaging network such as an electronic mail system to replicate data between computer sites. The replication provided by the present invention can be used with software applications, such as workgroup applications, to replicate data located on multiple sites. Workgroup replication data is sent to other sites via electronic mail (“e-mail”) messages. The present invention provides reliability features to handle errors in electronic mail transmissions. For example, the present invention provides the ability to reassemble objects at a replication site such that an object and all of its dependencies exist prior to the object's use at the site. Messages referred to as “ACK” messages are used to communicate a site's state and to provide other control information. Each site maintains latency information to determine transmission failures.Type: ApplicationFiled: January 29, 2001Publication date: May 30, 2002Inventors: David Christie, Jeffrey Winner
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Publication number: 20010028959Abstract: A pressure sensitive adhesive is based on a polymer having a glass transition temperature ≦10° C. and obtained by free-radically initiated polymerization of ethylenically unsaturated monomers in a liquid medium in the presence of >0 and ≦5% by weight, based on the overall amount of the ethylenically unsaturated monomers used for the polymerization, of at least one oligomeric compound itself obtained by free-radically initiated polymerization of ethylenically unsaturated monomers.Type: ApplicationFiled: February 15, 2001Publication date: October 11, 2001Applicant: BASF AktiengesellschaftInventors: Alexander Centner, David Christie
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Patent number: 6182117Abstract: The present invention provides the ability to use an existing store-and-forward messaging network such as an electronic mail system to replicate data between computer sites. The replication provided by the present invention can be used with software applications, such as workgroup applications, to replicate data located on multiple sites. Workgroup replication data is sent to other sites via electronic mail (“e-mail”) messages. The present invention provides reliability features to handle errors in electronic mail transmissions. For example, the present invention provides the ability to reassemble objects at a replication site such that an object and all of its dependencies exist prior to the object's use at the site. Messages referred to as “ACK” messages are used to communicate a site's state and to provide other control information. Each site maintains latency information to determine transmission failures.Type: GrantFiled: June 12, 1997Date of Patent: January 30, 2001Assignee: Netscape Communications CorporationInventors: David Christie, Jeffrey Winner