Patents by Inventor Raj Shah

Raj Shah 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: 4461857
    Abstract: Aqueous thermosetting coating compositions are disclosed characterized by reduced curing requirements and which produce coatings having superior cured properties. These coatings comprise water containing water miscible organic solvent and the compositions have dispersed therein, based on total resin solids, from 25% to 85% of carboxy-functional organic solvent-soluble copolymer salt with a volatile amine in which the copolymer contains hydroxy groups providing an hydroxyl value in the range of 30 to 300, from 5% to 40% of a water soluble or water dispersible aminoplast or phenoplast curing agent, and from 2% to 35%, of a water dispersible epoxy phosphate ester polymer which is an oxirane-function-free, salt reaction product of (1) a monoester reaction product containing residual epoxy functionality, of (a) a resinous polyepoxide having at least about 1.4 oxirane groups per molecule, and (b) less than 0.
    Type: Grant
    Filed: October 31, 1983
    Date of Patent: July 24, 1984
    Assignee: DeSoto, Inc.
    Inventors: Kazys Sekmakas, Raj Shah
  • Patent number: 4459401
    Abstract: An essentially linear polyester oligomer having hydroxyl and carboxyl terminal groups for subsequent cure and its production are disclosed. This polyester oligomer is produced by first adducting approximately equimolar amounts of diol carrying two primary hydroxyl groups and a dicarboxylic acid anhydride to form an hydroxy acid. The carboxyl groups of this hydroxy acid are then esterified by reaction with an approximately stoichiometric proportion of diol carrying one primary hydroxyl group and one secondary hydroxyl group, the stoichiometry being based on the total hydroxyl content of the diol and the carboxyl content of the hydroxy acid, to form an hydroxyl-terminated oligomer. This hydroxyl-terminated oligomer is then adducted with a polycarboxylic acid monoanhydride having a carboxyl functionality of at least 3, this monoanhydride being used in an amount of 0.01 to 0.15 equivalents of anhydride per hydroxyl equivalent in the hydroxyl-terminated oligomer.
    Type: Grant
    Filed: May 4, 1983
    Date of Patent: July 10, 1984
    Assignee: DeSoto, Inc.
    Inventors: Kazys Sekmakas, Raj Shah, Ronald J. Lewarchiki, Kevin P. Murray
  • Patent number: 4425451
    Abstract: Water dispersible epoxy-phosphate ester polymer salts are disclosed which exhibit improved stability in coating compositions contining aminoplast or phenoplast resin. These salts are provided by reacting a resinous polyepoxide having at least about 1.4 oxirane groups per molecule with less than 0.9 mol of orthophosphoric acid for each oxirane equivalent in the polyepoxide to form a monoester reaction product containing residual epoxy functionality. The monoester reaction product so-provided is then reacted with at least 1 mol of a volatile amine per equivalent of oxirane functionality in said monoester to provide a water dispersible product lacking oxirane functionality. Ether alcohols, and especially 2-butoxy ethanol, are relied upon to provide dispersions having low viscosity.
    Type: Grant
    Filed: September 29, 1982
    Date of Patent: January 10, 1984
    Assignee: DeSoto, Inc.
    Inventors: Kazys Sekmakas, Raj Shah
  • Patent number: 4404336
    Abstract: Epoxy ester copolymer dispersible in water with the aid of an amine, which may be ammonia, is provided by esterifying a polyepoxide having a 1,2-epoxy equivalency in excess of 1.0 and a molecular weight of from 350 to 8000 with at least 0.5% of the weight of the copolymer of a monoester of a saturated monohydric alcohol with a monoethylenically unsaturated dicarboxylic acid which resists homopolymerization. This polyepoxide ester is copolymerized with from 15% to 70% of monoethylenic monomers, based on the weight of the copolymer, these monoethylenic monomers including carboxyl functional monomer providing an acid number of from 20-150 in the copolymer.
    Type: Grant
    Filed: August 20, 1981
    Date of Patent: September 13, 1983
    Assignee: DeSoto, Inc.
    Inventors: Kazys Sekmakas, Raj Shah
  • Patent number: 4396732
    Abstract: An amine resin soluble in water with the aid of an acid is produced by reacting a dihydric phenolic compound, such as a bisphenol, with a stoichiometric deficiency of preferably aromatic diepoxide, and then reacting the product containing less than -0.3 part of unreacted dihydric phenolic compound per part of reaction product with at least about 3.25 mol of formaldehyde per mol of said reaction product and with monosecondary amine to produce a Mannich base. This Mannich base is then reacted with additional diepoxide in an amount of from 0.5 to 2 epoxy equivalents per epoxy equivalent in the initially used diepoxide.
    Type: Grant
    Filed: July 13, 1981
    Date of Patent: August 2, 1983
    Assignee: DeSoto, Inc.
    Inventors: Kazys Sekmakas, Raj Shah
  • Patent number: 4387197
    Abstract: The production of amine resins having Mannich base groups which dissolve in water with the aid of a solubilizing acid is disclosed in which a dihydric phenolic organic compound, such as a bisphenol, is reacted in organic solvent medium with at least 3 moles of formaldehyde per mol of bisphenol to at least partially methylolate the bisphenol prior to other reactions. The at least partially methylolated product is then reacted with a stoichiometric deficiency of organic diepoxide, and then with monosecondary amine to provide Mannich base groups. The Mannich base-containing product is then reacted with additional epoxide-functional material.
    Type: Grant
    Filed: March 8, 1982
    Date of Patent: June 7, 1983
    Assignee: DeSoto, Inc.
    Inventors: Kazys Sekmakas, Raj Shah
  • Patent number: 4341681
    Abstract: Cationic solution addition copolymers of monoethylenically unsaturated copolymerizable monomers are described having Mannich base side chains with the structure: ##STR1## where R and R' are selected from C.sub.1 -C.sub.8 alkyl and C.sub.1 -C.sub.8 alkanol, or are together constituted by a C.sub.2 -C.sub.8 alkylene group. This copolymer is preferably reacted with a diepoxide in a stoichiometric deficiency with respect to the amine groups in the side chains. At least a portion of the tertiary amine groups are then reacted with a solubilizing acid to form a salt which enables the copolymer to be dissolved in water.
    Type: Grant
    Filed: May 18, 1981
    Date of Patent: July 27, 1982
    Assignee: De Soto, Inc.
    Inventors: Kazys Sekmakas, Raj Shah, Aurelio J. Parenti
  • Patent number: 4321176
    Abstract: A method of forming a latex coating composition is disclosed in which there is first formed an aqueous emulsion of liquid droplets of water-insoluble polyol, such as a propylene oxide adduct of bisphenol. A, with the aid of a surfactant, and monoethylenically unsaturated monomers to be copolymerized are incorporated in the polyol emulsion while conditions of elevated temperature and catalysis are maintained to cause polymerization of said monomers in association with said polyol. The polyol is used in an amount of about 1% to about 25%, based on the weight of the materials which are copolymerized, and the monomers desirably include from about 0.5% to about 10% on the same basis of a reactive monomer, such as isobutoxymethyl acrylamide.
    Type: Grant
    Filed: January 10, 1980
    Date of Patent: March 23, 1982
    Assignee: DeSoto, Inc.
    Inventors: Kazys Sekmakas, Raj Shah
  • Patent number: 4312799
    Abstract: An amine resin soluble in water with the aid of an acid is produced by reacting a dihydric phenolic compound with a stoichiometric deficiency of aromatic diepoxide, then reacting the product with formaldehyde to generate methylol groups on the aromatic moieties present in the product, then reacting at least a portion of the methylol groups with monosecondary amine to produce a Mannich base, and then reacting the Mannich base with additional diepoxide in an amount of from 0.5 to 2 epoxy equivalents per epoxy equivalent in the initially used diepoxide.
    Type: Grant
    Filed: June 18, 1980
    Date of Patent: January 26, 1982
    Assignee: DeSoto, Inc.
    Inventors: Kazys Sekmakas, Raj Shah
  • Patent number: 4296011
    Abstract: Water soluble epoxy ester copolymers adapted for sanitary can use comprise an hydroxy functional epoxy ester of a polyepoxide having an average molecular weight of about 300 to about 1100 and a 1,2-epoxy equivalency of about 1.4 to about 2.0, esterified with an at least approximately stoichiometric proportion, based on epoxide functionality, of monocarboxylic acid selected from benzoic acid, C.sub.1 -C.sub.8 alkyl substituted benzoic acid, and C.sub.6 -C.sub.10 alkanoic acid, the esterification reaction being continued to provide an acid number of less than 20, this hydroxy functional epoxy ester is polyesterified with from 1.
    Type: Grant
    Filed: October 6, 1980
    Date of Patent: October 20, 1981
    Assignee: DeSoto, Inc.
    Inventors: Kazys Sekmakas, Raj Shah
  • Patent number: 4294737
    Abstract: Epoxy ester copolymer dispersible in water with the aid of an amine, which may be ammonia, is provided by esterifying a polyepoxide having a 1,2-epoxy equivalency in excess of 1.0 and a molecular weight of from 350 to 8000 with at least 0.5% of the weight of the copolymer of a monoester of a saturated monohydric alcohol with a monoethylenically unsaturated dicarboxylic acid which resists homopolymerization. This polyepoxide ester is copolymerized with from 15% to 70% of monoethylenic monomers, based on the weight of the copolymer, these monoethylenic monomers including carboxyl functional monomer providing an acid number of from 20-150 in the copolymer.
    Type: Grant
    Filed: May 27, 1980
    Date of Patent: October 13, 1981
    Assignee: DeSoto, Inc.
    Inventors: Kazys Sekmakas, Raj Shah
  • Patent number: 4285844
    Abstract: A low temperature-curing aqueous coating composition contains an acidic solution copolymer of monoethylenically unsaturated monomers, including about 2% to about 20% of carboxyl-functional monomer based on the weight of the copolymer, with a mixture of ethylenically unsaturated esters of ethylenically unsaturated fatty acids with organic solvent soluble and water insoluble polymeric polyol and water insoluble bisphenol-propylene oxide adduct polyol. Cure is preferably obtained using aminoplast or phenoplast curing agents, and the curing temperature is further lowered because the copolymer includes residual unsaturation providing an air dry capacity.
    Type: Grant
    Filed: January 10, 1980
    Date of Patent: August 25, 1981
    Assignee: DeSoto, Inc.
    Inventors: Kazys Sekmakas, Raj Shah
  • Patent number: 4265795
    Abstract: Cationic amine-functional copolymer mixtures with aminoplast resins which are stably dispersible in water with the aid of a solubilizing acid and water miscible organic solvent, and which cure to possess superior detergent and corrosion resistance are provided by forming a solution copolymer of monoethylenically unsaturated monomers including from 3% to 35% of monomer having a basic amino group and from 20% to less than 35% of isobutoxymethyl acrylamide or methacrylamide. The copolymer preferably includes from 20% to 45% of styrene and/or vinyl toulene in admixture with from 15% to 40% of 2-ethylhexyl methacrylate and the preferred aminoplast resins are benzoguanamine-formaldehyde and bisphenol-formaldehyde.
    Type: Grant
    Filed: October 16, 1979
    Date of Patent: May 5, 1981
    Assignee: DeSoto, Inc.
    Inventors: Kazys Sekmakas, Raj Shah
  • Patent number: 4263189
    Abstract: Water dispersible cationic amine-functional copolymer condensates are prepared by heat reacting in solution in water miscible organic solvent a solution copolymer containing from 3% to 35% of monomer having a basic amino group and from 20% to 50% of isobutoxymethyl acrylamide or methacrylamide, the amine groups in the copolymer being at least partially neutralized by a solubilizing acid, with from 5% to 40% of a solvent-soluble, heat-hardening condensate of a phenol having at least two aldehyde-reactive positions with at least two mols of formaldehyde per mol of the phenol, the phenolic condensate being poorly dispersible in water until after condensation with the copolymer.
    Type: Grant
    Filed: December 17, 1979
    Date of Patent: April 21, 1981
    Assignee: DeSoto, Inc.
    Inventors: Kazys Sekmakas, Raj Shah
  • Patent number: 4263192
    Abstract: Methods are disclosed for the production of a water dispersible solution of acidic copolymer in water soluble polyol with controlled limited reaction between the copolymer and the polyol. This method comprises copolymerizing monoethylenically unsaturated monomers including a proportion of carboxyl-functional monomer providing dispersibility in water with the aid of a base and from 0.5%-5%, based on the total weight of monomers, of a monoethylenically unsaturated monomer carrying a reactive group selected from dicarboxylic acid anhydride functionality and N-methylol functionality, the copolymerization being carried out in solution in a water soluble polyol. This copolymerization is preceded by or carried out under conditions causing substantially complete reaction between the anhydride or the N-methylol functionality in the reactive monomer, and the hydroxy groups in the polyol. Aqueous coating compositions are provided by dispersing the copolymer solution in water with the aid of a volatile base.
    Type: Grant
    Filed: May 29, 1979
    Date of Patent: April 21, 1981
    Assignee: DeSoto, Inc.
    Inventors: Kazys Sekmakas, Raj Shah
  • Patent number: 4257933
    Abstract: A solution copolymer of styrene or vinyl toluene and allyl or methallyl alcohol is esterified with from 20% to 65% of the weight of the ester with ethylenically unsaturated monocarboxylic fatty acid containing from 8 to 22 carbon atoms. This ester is then copolymerized with monoethylenically unsaturated monomers including from about 2% to about 15%, based on the total weight of the final copolymer, of a monoethylenically unsaturated carboxylic acid to provide a copolymer which dissolves in water with the aid of a volatile base and which is particularly useful in pigmented latex paints.
    Type: Grant
    Filed: January 10, 1980
    Date of Patent: March 24, 1981
    Assignee: DeSoto, Inc.
    Inventors: Kazys Sekmakas, Raj Shah
  • Patent number: 4247659
    Abstract: Water soluble epoxy ester copolymers adapted for sanitary can use comprise an hydroxy functional epoxy ester of a polyepoxide having an average molecular weight of about 300 to about 1100 and a 1,2-epoxy equivalency of about 1.4 to about 2.0, esterified with an at least approximately stoichiometric proportion, based on epoxide functionality, of monocarboxylic acid selected from benzoic acid, C.sub.1 -C.sub.8 alkyl substituted benzoic acid, and C.sub.6 -C.sub.10 alkanoic acid, the esterification reaction being continued to provide an acid number of less than 20, this hydroxy functional epoxy ester is polyesterified with from 1.
    Type: Grant
    Filed: March 9, 1979
    Date of Patent: January 27, 1981
    Assignee: DeSoto, Inc.
    Inventors: Kazys Sekmakas, Raj Shah
  • Patent number: 4227982
    Abstract: Nongelled, amine functional polymers dispersible in water with the aid of a solubilizing acid are provided by copolymerizing (A) an ethylenically unsaturated hydroxy functional amine adduct free of epoxy groups and containing from about 1.4 to about 2.0 ethylenically unsaturated amine groups per molecule, formed from a polyepoxide having a 1,2-epoxy equivalency of from 1.4 to about 2.0 and at least a stoichiometric amount of a secondary amine with two unsaturated groups; and (B) copolymerizable monoethylenically unsaturated monomers, a portion of which is amine-functional. The water solutions are particularly useful to enable corrosion resistant coatings to be electrodeposited at the cathode.
    Type: Grant
    Filed: May 31, 1979
    Date of Patent: October 14, 1980
    Assignee: DeSoto, Inc.
    Inventors: Kazys Sekmakas, Raj Shah
  • Patent number: 4228049
    Abstract: A low temperature-curing aqueous coating composition contains an acidic solution copolymer of monoethylenically unsaturated monomers, including about 2% to about 20% of carboxyl-functional monomer based on the weight of the copolymer, with a mixture of ethylenically unsaturated esters of ethylenically unsaturated fatty acids with organic solvent soluble and water insoluble polymeric polyol and water soluble bisphenol-ethylene oxide adduct polyol. Cure is preferably obtained using aminoplast and phenoplast curing agents, and the curing temperature is further lowered because the copolymer includes residual unsaturation providing an air dry capacity.
    Type: Grant
    Filed: November 13, 1978
    Date of Patent: October 14, 1980
    Assignee: DeSoto, Inc.
    Inventors: Kazys Sekmakas, Raj Shah
  • Patent number: 4222912
    Abstract: Low temperature curing aqueous coatings are provided by combining a water soluble bisphenol polyol with a branched copolymer of an unsaturated epoxy ester with monoethylenic monomers including about 3% to about 20% carboxyl-functional monomer, based on the weight of the copolymer, so that the copolymer can be dispersed in water with the aid of a volatile base. The solids content is increased or the viscosity is lowered, the curing temperature is reduced, and the corrosion resistance is enhanced by the presence of the bisphenol polyol.
    Type: Grant
    Filed: November 13, 1978
    Date of Patent: September 16, 1980
    Assignee: DeSoto, Inc.
    Inventors: Kazys Sekmakas, Raj Shah