Patents by Inventor Lee R. Harper
Lee R. Harper 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: 6426148Abstract: A curable coating composition comprising, in an organic solvent, a binder of (i) a non-isocyanate oligomer or blend of oligomers containing at least two functional groups with at least one being an epoxy group, the remaining being epoxy or hydroxyl; (ii) optionally a polyester, oligoester, or acrylic polymer with at least two hydroxyl groups; and (iii) an oligomeric crosslinker or blend of crosslinkers which contain at least two isocyanate groups.Type: GrantFiled: January 14, 2000Date of Patent: July 30, 2002Assignee: E. I. du Pont de Nemours & CompanyInventors: Robert John Barsotti, Lee R. Harper, John David Nordstrom
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Patent number: 5837353Abstract: A coating composition based on low molecular weight anhydrides having pendant, non-cyclic anhydride moieties, hydroxy-functional epoxy resin, and active catalyst wherein the coating composition cures at ambient conditions.Type: GrantFiled: January 7, 1997Date of Patent: November 17, 1998Assignee: E. I. du Pont de Nemours and CompanyInventors: Robert J. Barsotti, Lee R. Harper
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Patent number: 5367004Abstract: An ambient cured aqueous coating composition useful for maintenance coatings for architectural structures or for a finish or refinish for automobiles and trucks. The film-forming binder comprises a neutralized half-ester product of an acrylic polymer having at least two reactive anhydride groups and an epoxy-containing, optionally silane-containing crosslinker. The composition may be used as a mulit-package system. The composition is characterized by improved environmental resistance and excellent clarity and appearance, particularly for clearcoats.Type: GrantFiled: November 17, 1992Date of Patent: November 22, 1994Assignee: E. I. du Pont de Nemours and CompanyInventors: Robert J. Barsotti, Lee R. Harper, Michele R. Lock
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Patent number: 5331050Abstract: An improved process for forming multiple coats of finishes on a substrate by sequential (a) applying to the substrate a layer of a color basecoat composition of waterborne coating composition of an acrylic polymer latex contains pigment; (b) applying to the layer of color basecoat composition before it is fully cured a clear coat composition of an acrylic polymer having crosslinkable groups and a crosslinking agent in a volatile organic solvent and (c) subsequently simultaneously curing the basecoat composition and the clear coat composition; the improvement used therewith comprises a solvent based clear coating composition having a binder of about40-95% by weight of an epoxy acrylic polymer having at least one alkyl methacrylate having 2-12 carbon atoms in the alkyl group, and glycidyl methacrylate or acrylate and having a weight average molecular weight of about 3,000-10,000 and a glass transition temperature of about -20.degree. to +50.degree. C.Type: GrantFiled: March 3, 1993Date of Patent: July 19, 1994Assignee: E. I. Du Pont de Nemours and CompanyInventor: Lee R. Harper
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Patent number: 5227201Abstract: An improved process for forming multiple coats of finishes on a substrate by sequential (a) applying to the substrate a layer of a color basecoat composition of waterborne coating composition of an acrylic polymer latex contains pigment; (b) applying to the layer of color basecoat composition before it is fully cured a clear coat composition of an acrylic polymer having crosslinkable groups and a crosslinking agent in a volatile organic solvent and (c) subsequently simultaneously curing the basecoat composition and the clear coat composition; the improvement used therewith comprises a solvent based clear coating composition having a binder of about40-95% by weight of an acrylic polymer having at least two alkyl methacrylates having 2-12 carbon atoms in the alkyl group,a hydroxy alkyl methacrylate having 2-4 carbon atoms in the alkyl group and having a weight average molecular weight of about 3,000-10,000 and a glass transition temperature of about -20.degree. to +50.degree. C.Type: GrantFiled: June 20, 1991Date of Patent: July 13, 1993Assignee: E. I. Du Pont de Nemours and CompanyInventor: Lee R. Harper
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Patent number: 5215783Abstract: An improved process for forming multiple coats of finishes on a substrate by sequential (a) applying to the substrate a layer of a color basecoat composition of waterborne coating composition of an acrylic polymer latex contains pigment; (b) applying to the layer of color basecoat composition before it is fully cured a clear coat composition of an acrylic polymer having crosslinkable groups and a crosslinking agent in a volatile organic solvent and (c) subsequently simultaneously curing the basecoat composition and the clear coat composition; the improvement used therewith comprises a solvent based clear coating composition having a binder of about40-95% by weight of an epoxy acrylic polymer having at least one alkyl methacrylate having 2-12 carbon atoms in the alkyl group, and glycidyl methacrylate or acrylate and having a weight average molecular weight of about 3,000-10,000 and a glass transition temperature of about -20.degree. to +50.degree. C.Type: GrantFiled: June 24, 1991Date of Patent: June 1, 1993Assignee: E. I. Du Pont de Nemours and CompanyInventor: Lee R. Harper
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Patent number: 5206295Abstract: A coating composition, useful for finishing automobiles and trucks, in which the film forming binder contains, as reactive binder components, a mixture of a first polymer having at least two reactive anhydride groups and a second polymer or oligomer having at least two reactive epoxy groups, characterized by the second polymer being structured so that the epoxy groups are skewed to have a majority thereof at one end of the polymer.Type: GrantFiled: February 25, 1991Date of Patent: April 27, 1993Assignee: E. I. Du Pont de Nemours and CompanyInventors: Lee R. Harper, Gayann S. McDonnell
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Patent number: 5093391Abstract: A coating composition useful for a finish for automobiles and trucks in which the film forming binder contains reactive binder components of about(a) 25-90% by weight, based on the weight of the binder, of an acrylic polymer having at least two reactive anhydride groups composed of polymerized monomers of an ethylenically unsaturated anhydride and polymerized monomers from the group consisting of alkyl methacrylate, alkyl acrylate and any mixtures thereof, wherein the alkyl groups have 1-8 carbon atoms and the polymer has a weight average molecular weight of about 2,000-50,000;(b) 5-50% by weight, based on the weight of the binder, of a glycidyl component having at least two reactive glycidyl groups;(c) 5-50% by weight, based on the weight of the binder of an acid functional monomeric, oligomeric or polymeric compound which may or may not contain hydroxyl functionality; andthe composition contains about 0.1-5% by weight; based on the weight of the binder, of a catalyst.Type: GrantFiled: June 15, 1990Date of Patent: March 3, 1992Assignee: E. I. Du Pont de Nemours and CompanyInventors: Robert J. Barsotti, Lee R. Harper
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Patent number: 5017435Abstract: A coating composition useful for a finish for automobiles and trucks in which the film forming binder contains reactive binder components of about(a) 25-90% by weight, based on the weight of the binder, of an acrylic polymer having at least two reactive anhydride groups composed of polymerized monomers of an ethylenically unsaturated anhydride and polymerized monomers from the group consisting of alkyl methacrylate, alkyl acrylate and any mixtures thereof, wherein the alkyl groups have 1-8 carbon atoms and the polymer has a weight average molecular weight of about 2,000-50,000;(b) 5-50% by weight, based on the weight of the binder, of a glycidyl component having at least two reactive glycidyl groups;(c) 5-40% by weight, based on the weight of the binder, of a monomeric or oligomeric anhydride component; andthe composition contains about 0.1-5% by weight, based on the weight of the binder, of a catalyst.Type: GrantFiled: June 27, 1988Date of Patent: May 21, 1991Assignee: E. I. Du Pont de Nemours and CompanyInventors: Robert J. Barsotti, Lili W. Altschuler, Lee R. Harper
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Patent number: 4423165Abstract: Water-borne reaction products of (a) carboxyl-functional polymers; (b) polyepoxides; and (c) tertiary amines are blended with (d) carboxyl-functional polymers having an acid number dissimilar to that of (a). The resulting products are useful as film-forming components of coating compositions which can be spray-, flow-, dip-, roller-, or electro-coated and are especially useful for spray coating the inside of two-piece tin-plated steel cans of beverages and food. The coating compositions are useful as such or can be crosslinked with crosslinking agents such as a nitrogen resin.Type: GrantFiled: April 16, 1982Date of Patent: December 27, 1983Assignee: E. I. Du Pont de Nemours and CompanyInventors: Lee R. Harper, Judith E. Obetz, William H. Steinmetz
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Patent number: 4388372Abstract: A durable antisoiling coating composition for textile filaments comprises a perfluoroalkyl ester of a citric acid urethane and fluorinated alcohols in combination with a modified epoxy resin which is the reaction product of a carboxyl-functional vinyl polymer, an epoxy resin and a tertiary amine. The composition can be applied as an aqueous dispersion, including a non-ionic textile lubricant based on poly(ethylene glycol).Type: GrantFiled: March 10, 1982Date of Patent: June 14, 1983Assignee: E. I. Du Pont de Nemours and CompanyInventors: Nitin J. Champaneria, Lee R. Harper, Edward A. Hosegood
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Patent number: 4325857Abstract: A durable antisoiling coating composition for textile filaments and articles made therefrom comprises a perfluoroalkyl ester of a citric acid urethane and fluorinated alcohols in combination with a modified epoxy resin which is the reaction product of a carboxyl-functional vinyl polymer, an epoxy resin and a tertiary amine. The composition can be applied as an aqueous dispersion, including a non-ionic textile lubricant based on poly(ethylene glycol). The dispersion can be used as a spin finish to provide durable protection to filaments, particularly nylon filaments.Type: GrantFiled: May 13, 1980Date of Patent: April 20, 1982Assignee: E. I. Du Pont de Nemours and CompanyInventors: Nitin J. Champaneria, Lee R. Harper, Edward A. Hosegood
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Patent number: 4267288Abstract: Described are polyester-urethane-epoxy adhesives produced by reacting one or more diols with two or more dicarboxylic acids to form a polyester prepolymer; chain-extending the prepolymer with an organic diisocyanate to yield a hydroxy-terminated polyester-urethane; capping the urethane partially or completely with a dicarboxylic acid or anhydride of dicarboxylic acid; and finally reacting with an epichlorohydrin/bisphenol A-type epoxy resin, forming an epoxy polyester-urethane block copolymer. The resulting product may then be crosslinked in use as an adhesive.Type: GrantFiled: July 23, 1979Date of Patent: May 12, 1981Assignee: E. I. Du Pont de Nemours and CompanyInventors: Dean C. Burkhart, Lee R. Harper, Eugene G. Sommerfeld