Coal, Asphaltic, Or Bituminous Material Dnrm Patents (Class 523/450)
  • Patent number: 10711153
    Abstract: The present invention relates to a composition for coating, in particular a composition comprising lignin and one or more epoxy-group containing compounds, and methods for the manufacturing thereof and uses thereof. The present invention also relates to products obtainable by said methods and uses thereof.
    Type: Grant
    Filed: September 25, 2014
    Date of Patent: July 14, 2020
    Assignee: Stora Enso OYJ
    Inventors: Ashar Zafar, Dimitri Areskogh
  • Patent number: 10550282
    Abstract: An object of the present invention is to find a cationic electrodeposition coating composition excellent in throwing power, anti-GA gas pinhole properties, and anti-corrosion properties, and to provide a coated article excellent in these coating film properties. The present invention provides a cationic electrodeposition coating composition containing an amino-containing epoxy resin (A), a blocked polyisocyanate curing agent (B), and a pigment (C), the amino-containing epoxy resin (A) being obtained by reacting an epoxy resin (A1), a polyphenol compound (A2), a dimer acid diglycidyl ester (A3), and an amine compound (A4).
    Type: Grant
    Filed: January 11, 2016
    Date of Patent: February 4, 2020
    Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, KANSAI PAINT CO., LTD.
    Inventors: Takeo Yamaguchi, Motohide Mori, Masahiro Nakamura, Hiroshi Hosono, Minoru Hanatani, Shigetaka Setodoi
  • Patent number: 10214450
    Abstract: Hardener composition for an addition-polymerization-curable synthetic fixing mortar system for embedding anchoring means in mortar in holes or crevices, wherein the hardener composition includes oligomeric siloxanes having on average per molecule at least one or preferably two or more organic radicals that carry one or more (secondary or primary) amino and/or thiol groups that react with isocyanate or epoxy groups in the addition reaction and having on average per molecule at least one or more hydrolysable groups, and, in addition, can include one or more further customary additives, to synthetic fixing mortar systems including such a hardener composition, to the use of such synthetic fixing mortar systems for embedding anchoring means in mortar in holes or crevices and to methods of producing and using the synthetic fixing mortar systems and the hardener composition.
    Type: Grant
    Filed: September 9, 2015
    Date of Patent: February 26, 2019
    Assignee: FISCHERWERKE GMBH & CO. KG
    Inventors: Jürgen Grün, Martin Vogel, Christian Schlenk, Christian Weinelt
  • Patent number: 10190359
    Abstract: A double glazing having a first pane and a second pane, and a spacer between the first pane and the second pane is described. The spacer has a glazing interior surface, an external surface and two pane contact surfaces; a glazing interior bordered by the inner faces of the first pane and of the second pane and the glazing interior surface of the spacer; an external intermediate space between the panes adjacent to the first pane, the second pane, and the external surface.
    Type: Grant
    Filed: December 5, 2014
    Date of Patent: January 29, 2019
    Assignee: SAINT-GOBAIN GLASS FRANCE
    Inventor: Rino Messere
  • Patent number: 9650545
    Abstract: A decorative laminate includes a laminate substrate coated with an adhesive layer. The adhesive layer is a layer of a physically setting, solvent-free adhesive material including an acrylic polymer. The adhesive layer is self-adhesive at room temperature. The adhesive-coated laminate substrate has a peeling-off force of at least 0.2 N/mm2, after application on a carrier. A method for the production of the adhesive-coated laminate substrate, its use as a coating material, and a composite of the adhesive-coated laminate substrate and a carrier material are also provided.
    Type: Grant
    Filed: November 30, 2012
    Date of Patent: May 16, 2017
    Assignee: Wilsonart LLC
    Inventors: Wen-Feng Liu, James W. Stone, Donald P. Schaefer, Lutz H. Reitzel
  • Publication number: 20140348776
    Abstract: The invention provides a composition comprising: (a) about 0% to 99% by weight of at least one resin wherein the resin is selected from the group consisting of epoxy, latex, polyurethane, polyurea, polyspartic, or alkyd resins; (b) about 1%-99% by weight of tristyrenated phenol or distyrenated phenol; and (c) optionally about 2% to 98% by weight of an additional solvent.
    Type: Application
    Filed: April 22, 2014
    Publication date: November 27, 2014
    Inventors: Charles Francis Palmer, JR., Gerald Vandezande
  • Publication number: 20140147205
    Abstract: The invention provides a bituminous composition comprising 20 to 80 wt % bitumen, 0.1 to 7 wt % of a copolymer formed from monomers including ethylene and glycidyl methacrylate or glycidyl acrylate, and 20 to 60 wt % sulphur, all weight percentages based on the weight of the bituminous composition. It further provides a process for making this composition and asphalt compositions comprising such bituminous composition.
    Type: Application
    Filed: April 5, 2012
    Publication date: May 29, 2014
    Inventors: David Strickland, Majid Jamshed Chughtai, Richard Walter May
  • Publication number: 20140112716
    Abstract: An acid modified asphalt binder is combined with an emulsifier solution to produce an emulsified asphalt binder. The acid modified asphalt binder may be formed by combining an asphalt binder, a phosphorous-based acid, and, optionally, a polymer modifier. The emulsifier solution may be produced by forming an aqueous solution of an amine and a phosphorous-based acid, which forms an aqueous solution comprising an amine phosphate. The emulsified asphalt binder may be combined with an aggregate to form a paving material. In other examples, the emulsified asphalt binder may be used alone, for example in a chip seal application, or in a diluted form, for example in a fog seal application.
    Type: Application
    Filed: September 13, 2013
    Publication date: April 24, 2014
    Inventors: Gaylon L. Baumgardner, Gerald H. Reinke
  • Publication number: 20120301222
    Abstract: A product and method for repairing holes and cracks in roads, parking lots, sidewalks and other similar surfaces using a mixture of powder coating (i.e. dry paint) and a filler. The first step is to obtain the powder coating material. Any suitable powder coating material may be used, however, it is preferable to use the excess or waste powder coating material obtained from a powder coating operation. The next step is to mix the powder coating material with a filler, such as sand, pea gravel, or another suitable material. After the components are mixed together, it is applied to a surface needing repair such as a pothole in a road or a crack in a sidewalk. The mixture is cured by heating the mixture to the point where the powder coating melts and binds the powder coating with the filler and the surface needing repair. It may be cured before or after it is applied to the surface needing repair. After the mixture cures, the result is a high quality patched surface.
    Type: Application
    Filed: May 27, 2011
    Publication date: November 29, 2012
    Inventor: Duane J. Laffey
  • Publication number: 20120238669
    Abstract: Inventive composite materials are provided. The composite is preferably a nano-composite, and comprises an asphaltene, or a mixture of asphaltenes, blended with a polymer. The polymer can be any polymer in need of altered properties, including those selected from the group consisting of epoxies, acrylics, urethanes, silicones, cyanoacrylates, vulcanized rubber, phenol-formaldehyde, melamine-formaldehyde, urea-formaldehyde, imides, esters, cyanate esters, allyl resins.
    Type: Application
    Filed: March 16, 2012
    Publication date: September 20, 2012
    Applicant: Honeywell Federal Manufacturing & Technologies, LLC
    Inventor: Daniel E. Bowen, III
  • Patent number: 8124674
    Abstract: The present invention relates to a halogen-free resin composition with high frequency dielectric property, and a prepreg and a laminate made therefrom. The halogen-free resin composition with high frequency dielectric property comprises, calculating according to the parts by weight of organic solids: (A) 10-50 parts by weight of copolymer of styrene-maleic anhydride; (B) 10-50 parts by weight of at least one compound having dihydrobenzoxazine ring; (C) 10-50 parts by weight of at least one polyepoxide; (D) 5-30 parts by weight of at least one phosphorus-containing flame retardant. Prepregs and laminates made from the resin composition have low dielectric constant, low dielectric dissipation factor, high glass transition temperature, high heat resistance, low moisture adsorption, and the technological operation is simple.
    Type: Grant
    Filed: January 28, 2010
    Date of Patent: February 28, 2012
    Assignee: Guangdong Shengyi Sci. Tech Co., Ltd.
    Inventors: Shi Guo Su, Yue Shan He, Bi Wu Wang, Jie Li, Tao Chen
  • Patent number: 8044119
    Abstract: An insulating material and the method of applying the insulating material to products and systems. The material, method and system may be applied to tubulars used in deep water projects. The insulating material is composed of ceramic particles, epoxy and an acrylate monomer that is a precurser to an acrylic resin, and additives. Equal volumes of a epoxy component mixtures and a curing agent component mixture when heated and mixed together create a liquid insulating material that can be applied to the outer surface of pipe involving a repetitive series of steps controlled by an operator at a main control panel. Pipe unrolled from a pipe reel is straightened and heated. In a heated retort, liquid insulating material is applied to the surface of pipe and cured to the final insulation coating. The final coated pipe can be replaced on the reel for shipment to the job site.
    Type: Grant
    Filed: October 7, 1999
    Date of Patent: October 25, 2011
    Inventors: James E. Landry, Barry E. Burke
  • Publication number: 20090247670
    Abstract: The invention relates to an epoxy resin molding material for sealing, comprising an epoxy resin (A), a curing agent (B), and a colorant resin mixture (C) wherein a resin (C1) and a colorant (D) having an electric resistivity of 1×105?·cm or more are beforehand mixed with each other. This can provide an epoxy resin molding material for sealing which is good in moldabilities such as fluidity and curability, and colorability, and which does not cause a short circuit failure based on an electroconductive material even when the material is used in a package wherein the distance between pads or wires is small; and an electronic component device equipped with an element sealed therewith.
    Type: Application
    Filed: November 16, 2006
    Publication date: October 1, 2009
    Inventors: Mitsuyoshi Hamada, Akira Nagai, Mitsuo Katayose, Kazuyoshi Tendou
  • Publication number: 20090131558
    Abstract: Disclosed is a modified asphalt composition obtained by blending asphalt with a complex block copolymer, which is prepared by polymerizing styrene in the presence of an anionic polymerization initiator to prepare a polystyrene solution, adding butadiene to the polystyrene solution, and then further polymerizing styrene, and wherein a triblock copolymer and diblock copolymer are present at a specific proportion. The modified asphalt composition of the present invention exhibits superior ductility at low temperature, while exhibiting comparable or better softening point as compared to conventional compositions, and, thus, is applicable to road paving, waterproof sheets and sealants.
    Type: Application
    Filed: October 2, 2008
    Publication date: May 21, 2009
    Inventors: Sam Min KIM, Dong Hyuk Na, Dae Hyung Lee, Joon Bum Pyun
  • Publication number: 20090088497
    Abstract: The purposes of the present invention are to provide a paving material which is easy to be handled, has less restriction on the conditions of execution of work, decomposes fast, and is superior in durability, and a method for construction of paved body using the paving material. The purposes are attained by providing a paving material and a method for construction of paved body using the same, said paving material comprises at least binder emulsion for pavement, non-water soluble epoxy resin, and amine compound(s) a hardener thereof, and is prepared by mixing these three ingredients at the time of the execution of work, at the scene of the execution of work. The purposes are also attained by providing binder emulsion for pavement comprising an amine compound(s) that is a hardener of epoxy resin and the amine compound comprises at least polyaminoamido.
    Type: Application
    Filed: August 23, 2006
    Publication date: April 2, 2009
    Applicants: PETRO CHEMICALS CO., LTD., NICHIREKI CO. LTD.
    Inventors: Yoshihito Sasada, Akito Hagiwara, Masahiko Fujii, Kazuma Takeuchi, Sadaharu Ueno, Takashi Kanazawa, Tada-aki Ikeda
  • Publication number: 20090068348
    Abstract: The present invention provides a functionally dry warm mix asphalt binder composition modified with lubricating agents or additives that can be mixed with aggregate and compacted at temperatures substantially below asphalt binder compositions that do not contain the disclosed lubricating additives.
    Type: Application
    Filed: October 12, 2007
    Publication date: March 12, 2009
    Inventors: Gerald H. Reinke, Gaylon L. Baumgardner, Steven L. Engber
  • Publication number: 20080118637
    Abstract: The present invention relates to method for the preparation of a dry material for use as an ultra high strength pavement as well as the dry granular pavement material manufactured by the method, and furthermore the present invention also relates to a method for applying the ultra high strength pavement monolithic or to a subgrade.
    Type: Application
    Filed: January 13, 2006
    Publication date: May 22, 2008
    Inventor: Bo Serwin
  • Patent number: 6743838
    Abstract: The present invention relates to polyepoxy-polymer-linked-asphalt having enhanced properties made by reacting a glycidyl-functionalized ethylene copolymer with reactive asphalt, wherein the glycidyl-functionalized ethylene copolymer has a glycidyl-containing comonomer content of 5 weight percent or less and relatively high number average molecular weight characterized by a melt index of 4 grams/10 minutes or less measured in accord with ASTM D1238-65T, Condition E.
    Type: Grant
    Filed: July 1, 2002
    Date of Patent: June 1, 2004
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Robert Joseph Statz, Elizabeth R. Griffin
  • Patent number: 6395845
    Abstract: The present invention relates to thermoset epoxy resin waterproofing membranes for structures such as roofs comprising: (a) one or more epoxy resin(s) having an average of at least 1.5 epoxy groups per molecule; (b) a liquid amine terminated polyamide prepared by reacting at least one C18-50 dicarboxylic acid and an aminoalkylpiperazine in a ratio of moles of aminoalkylpiperazine to equivalents of carboxyl group in the acid of greater than 0.75:1; (c) one or more optional polyamine(s); (d) one or more optional filler(s); and (e) one or more optional modifying resin(s) wherein the tensile modulus of the thermoset epoxy waterproofing membranes is less than 200,000 psi and the tensile elongation of the thermoset epoxy waterproofing membranes is greater than 20%.
    Type: Grant
    Filed: December 15, 1998
    Date of Patent: May 28, 2002
    Assignee: Resolution Performance Products LLC
    Inventors: Daniel James Weinmann, Steven Lee Stewart
  • Patent number: 6020404
    Abstract: Bitumen/polymer compositions are provided containing a bitumen or a mixture of bitumens and, reckoned by weight of bitumen, 0.3% to 20% of at least one primary polymer selected among certain elastomers and plastomers and 0.01% to 12% of at least one olefinic polymer bearing epoxy or COOH groupings. The compositions are useful, directly or after dilution, to form bitumen/polymer binders for carrying out road surfacing, for coated materials or waterproof coatings.
    Type: Grant
    Filed: January 7, 1998
    Date of Patent: February 1, 2000
    Assignee: Elf Antar France Tour Elf-2 Place de la Coupole
    Inventors: Jean-Pascal Planche, Patrick Turello, Claude Lacour
  • Patent number: 6011095
    Abstract: Bitumen/polymer compositions are produced by contacting, between 100.degree. C. and 230.degree. C., under agitation, one bitumen or a mixture of bitumens with at least one olefinic polymer bearing epoxy or COOH groupings, then by incorporating in the product, an acid additive while the whole mixture is agitated at a range between 100.degree. C. and 230.degree. C. for at least 10 minutes. The product, which is subjected to treatment by the acid additive may still contain one or several additional polymers, for instance of the elastomer type cross-linkable with sulphur, and even be subjected to sulphur cross-linking before treatment. The bitumen/polymer compositions are useful directly or after dilution, to form binders for carrying out surfacing operations.
    Type: Grant
    Filed: April 20, 1998
    Date of Patent: January 4, 2000
    Assignee: ELF Antar France
    Inventors: Jean-Pascal Planche, Patrick Turello, Claude Lacour
  • Patent number: 5990203
    Abstract: The present invention relates to a method for improving the compatibility of random vinyl substituted aromatic/C.sub.4 -C.sub.6 conjugated diolefin polymer/asphalt mixtures comprising adding a modifier to said random vinyl substituted aromatic/C.sub.4 -C.sub.6 conjugated diolefin polymer/asphalt mixture selected from the group consisting of:(a) polymers containing an epoxy functionality(b) polymers containing a carboxyl functionality(c) monomers, oligomers, and polymers containing an amine functionality;(d) monomers, oligomers, and polymers containing an ester functionality; or mixtures thereof.
    Type: Grant
    Filed: May 4, 1998
    Date of Patent: November 23, 1999
    Assignee: BASF Corporation
    Inventors: John Tze-Chiang Cheng, Heinz Plaumann, Koichi Takamura, Arthur Barry Baughmann, Wai-chun Richard Liu
  • Patent number: 5604274
    Abstract: A thermosetting asphalt product includes a blend of an asphalt and an epoxy-functionalized polymer, the epoxy-functionalized polymer being present in an amount within the range of from about 4 to about 30 percent of the combination of asphalt and epoxy-functionalized polymer, where the epoxy-functionalized polymer forms a continuous phase within the asphalt product.
    Type: Grant
    Filed: October 6, 1995
    Date of Patent: February 18, 1997
    Assignee: Owens-Corning Fiberglas Technology, Inc.
    Inventors: Kevin P. Gallagher, Donn R. Vermilion
  • Patent number: 5576363
    Abstract: A thermosetting asphalt composition includes a blend of an asphalt and an epoxy-functionalized polymer, the epoxy-functionalized polymer being present in an amount within the range of from about 4 to about 30 percent of the combination of asphalt and epoxy-functionalized polymer.
    Type: Grant
    Filed: December 23, 1994
    Date of Patent: November 19, 1996
    Assignee: Owens Corning Fiberglas Technology, Inc.
    Inventors: Kevin P. Gallagher, Donn R. Vermilion
  • Patent number: 5451619
    Abstract: A bituminous composition comprising a bituminous component and an epoxidized polymer of a conjugated diolefin and, optionally, a vinyl aromatic hydrocarbon.
    Type: Grant
    Filed: August 19, 1994
    Date of Patent: September 19, 1995
    Assignee: Shell Oil Company
    Inventors: Robert Q. Kluttz, James R. Erickson
  • Patent number: 5266614
    Abstract: A novel organic coating to be used on metal surfaces as a protective barrier against corrosion is described. The coating comprises a base component formed from epoxy resin, petroleum coke, magnesium silicate, a solvent, and optionally a thixotropic agent and/or coal tar and a catalyst component preferably selected from the group consisting of polyamide resins and an amine. The coating of the present invention has a highly enhanced hardness and excellent abrasion resistance properties. A method of preparing a liquid paint-like material to be applied to a metal substrate to form the coating of the present invention is also described.
    Type: Grant
    Filed: March 27, 1990
    Date of Patent: November 30, 1993
    Assignee: Intevep, S.A.
    Inventors: Giuseppe Di Filippo, Ricardo L. P. Pocaterra
  • Patent number: 4882371
    Abstract: A durable epoxy resin paint composition is disclosed, comprising from 0.5 to 10% of a vinylidene chloride-based resin emulsion and from 99.5 to 90% of an epoxy resin paint. A durable epoxy resin paint composition is also disclosed, comprising from 5 to 40% of a metal foil piece having a specific surface area of 1000 cm.sup.2 /g or more, from and from 95 to 50% of an epoxy resin paint. The durable epoxy resin paint composition of the invention not only endures salt water, gasoline, ketones, crude oil, strong acids, strong alkalis, or other chemicals for a long period of time but also is suitable for the use in foods.
    Type: Grant
    Filed: August 4, 1987
    Date of Patent: November 21, 1989
    Assignee: Tohoku Dotetsu Kabushiki Kaisha
    Inventors: Yasushi Matsubara, Minoru Miyagawa, Masanori Takahashi
  • Patent number: 4812493
    Abstract: A two component water-based composition which cures in two stages, an initial rapid curing stage and a slower curing stage, comprising as the first component, a mixture of a polyaldehyde chosen from the group consisting of glyoxal glutaraldehyde and derivatives of glyoxal and gluteraldehyde, and a water dispersible component chosen from the group consisting of poxy resin emulsions which can be emulsified in water, synthetic latexes stable at about pH 7 or less, low molecular weight resin emulsions, epoxy ester emulsions, water emulsified alkyds, and cationic, anionic and non-ionic asphalt emulsions and, as the second component, the non-gel reaction product of N,N'-bis(methoxymethyl) uron and a polyamine chosen from a group consisting of primary and secondary amines and/or a monoamine.
    Type: Grant
    Filed: April 10, 1987
    Date of Patent: March 14, 1989
    Assignee: Adhesive Coatings Co.
    Inventor: Lowell O. Cummings
  • Patent number: 4535103
    Abstract: A coating composition comprises(A) a polyol resin obtained by the reaction of a prepolymer of epoxy resin and phosphorus compound having at least one P--OH bond, such as acids of phosphorus, and one or more compounds having one or more amino groups reactive with the epoxy group,(B) a compound having more than one isocyanate groups or groups which change to isocyanate groups under hardening condition, and(C) a bituminous material and/or its substitute.This coating composition can be coated on rusty metal surfaces.
    Type: Grant
    Filed: April 24, 1984
    Date of Patent: August 13, 1985
    Assignee: Asahi Denka Kogyo K.K.
    Inventors: Hidehiko Kojo, Koji Akimoto
  • Patent number: 4530947
    Abstract: A coating composition which comprises(A) a polyol resin obtained by the reaction of a prepolymer of epoxy resin and polyhydroxy penolic compound such as(i) poly-nuclear polyhydroxy phenols having adjacent hydroxy groups(ii) polyol esters of polyhydroxy phenolic carboxylic acids having adjacent hydroxy groups, and(iii) a mixture thereof, and one or more compound having one or more amino groups reactive with epoxy group;(B) a compound having more than one isocyanate group or groups which change to isocyanate groups under hardening condition, and(C) a bituminous material and/or its substitute.This coating composition can be coated on rusty metal surfaces.
    Type: Grant
    Filed: April 24, 1984
    Date of Patent: July 23, 1985
    Assignee: Asahi Denka Kogyo K.K.
    Inventors: Hidehiko Kojo, Koji Akimoto
  • Patent number: 4510273
    Abstract: A polyolefin fiber synthetic pulp having a specific Drainage Factor, Floating Factor, average diameter and Classified Fiber Length serves as an effective thixotropic agent.
    Type: Grant
    Filed: December 2, 1982
    Date of Patent: April 9, 1985
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Yoshikazu Miura, Koji Horimoto, Takenori Sumida
  • Patent number: 4507411
    Abstract: A composition suitable for forming surface coatings, laminates or composite materials formed by bringing together:(a) a first polymer containing carboxylic acid, anhydride or acid chloride groups,(b) an amine or alcohol or a derivative thereof which is a tertiary amine, a ketimine, an acetal or an oxazolidine and(c) a second polymer capable of cross-linking with the first polymer in the presence of the amine or alcohol.The components may be initially in two packs and either mixed prior to application or sprayed onto the surface simultaneously from separate nozzles.The surface coatings are particularly suitable for coating surfaces which are otherwise difficult to coat and protect and may be applied to wet or rusted surfaces without surface preparation.
    Type: Grant
    Filed: September 24, 1981
    Date of Patent: March 26, 1985
    Assignee: The British Petroleum Company Limited
    Inventors: Kevin R. Gordon, Jeffrey R. Kelsey, Ivan C. Stannard
  • Patent number: 4499215
    Abstract: An asphalt/epoxy resin coating composition in which asphalt and epoxy resin are sufficiently compatible with each other is produced by mixing under heat asphalt with a condensation product of an asphalt and a non-thermoreactive phenol resin such as C.sub.4 -C.sub.8 alkylphenol-formaldehyde resin, the condensation being effected at a temperature of 160.degree. to 200.degree. C. in the presence of an arylsulfonic acid as catalyst.The coating composition gives an excellent coating without separation of asphalt or silking based on the incompatibility of asphalt and epoxy resin, by mixing with a curing agent for epoxy resin.
    Type: Grant
    Filed: July 28, 1983
    Date of Patent: February 12, 1985
    Inventor: Sadashige Okada
  • Patent number: 4360608
    Abstract: An epoxy resin-bitumen material composition is prepared by mixing an epoxy resin and a bitumen material in the presence of a co-solubilizer represented by the general formula ##STR1## wherein R is hydrogen or a hydrocarbyl group having 1-9 carbon atoms, R' is an alkylene group having 2-3 carbon atoms, n is an integer 1-10 inclusive, and p and q are respectively an integer of 0-40 in average. The resulting composition is useful as a road pavement material, bonding material for railroad track ballast, anti-corrosion agent, etc. The cured product resulting from this composition is advantageous in that it has good heat resistance and free from bleeding.
    Type: Grant
    Filed: May 28, 1981
    Date of Patent: November 23, 1982
    Assignee: Mitsubishi Petrochemical Co., Ltd.
    Inventors: Kenji Hijikata, Kouichi Sakaguchi
  • Patent number: 4332706
    Abstract: Internal reflection of an optical glass is suppressed by applying a coating material comprising a material selected from coal tar and coal tar pitch and a resin selected from vinylidene chloride series copolymers and halogenated epoxy resins.
    Type: Grant
    Filed: May 13, 1980
    Date of Patent: June 1, 1982
    Assignee: Canon Kabushiki Kaisha
    Inventors: Haruo Uehara, Kunio Satomi