Patents Represented by Attorney R. B. Ingraham

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  • Impact-resistant polymers and rubber concentrates therefor
    Patent number: 4243765
    Abstract: Rubber concentrates for use in reinforcing acrylonitrile and styrene-containing polymers are prepared by graft polymerizing an acrylonitrile-styrene polymer on a rubber latex wherein a portion of the polymer is chemically combined with the rubber and a portion of the acrylonitrile-styrene polymer is not chemically combined. The uncombined or matrix polymer is of relatively low molecular weight.
    Type: Grant
    Filed: December 29, 1976
    Date of Patent: January 6, 1981
    Assignee: The Dow Chemical Company
    Inventors: Henno Keskkula, Frederick A. Miller
  • Process for the polymerization of acrylonitrile-butadiene-styrene resins
    Patent number: 4239863
    Abstract: Acrylonitrile-butadiene-styrene (ABS) resins are prepared by the mass or mass-suspension process employing a tertiary-butyl peroxy initiator having a 10-hour half-life between about 50.degree. and 95.degree. C. wherein initial polymerization of up to about 10 weight percent solids is conducted under plug flow conditions. From about 5 to 10 percent conversion to about 40 percent conversion is polymerized with agitation. The remaining polymerization is done with or without agitation. Improved impact resistance is obtained.
    Type: Grant
    Filed: June 28, 1979
    Date of Patent: December 16, 1980
    Assignee: The Dow Chemical Company
    Inventor: Corwin J. Bredeweg
  • Mixing method and container therefor
    Patent number: 4234447
    Abstract: In a process for the admixture of radio-active waste with an encapsulating resin in a container which will accompany the waste to a disposal site, the improvement which comprises providing a generally annular deflectable foil at an upper open end of the container to minimize contamination by splashing.
    Type: Grant
    Filed: July 17, 1978
    Date of Patent: November 18, 1980
    Assignee: The Dow Chemical Company
    Inventors: Robert A. Hay, II, Harold E. St. Louis
  • Panel and method for the preparation thereof
    Patent number: 4233361
    Abstract: Composite foam panels are prepared from expanded thermoplastic particles of low density by generally encapsulating the particles in a phenolic foam matrix and providing a particulate expanded mineral substance such as perlite disposed generally adjacent the major surfaces of the panel.
    Type: Grant
    Filed: July 27, 1978
    Date of Patent: November 11, 1980
    Assignee: The Dow Chemical Company
    Inventor: Duane A. Fultz
  • Dispersible vinylidene chloride polymer microgel powders as additives for urethane polymer foam
    Patent number: 4232129
    Abstract: A crosslinked vinylidene chloride polymer microgel powder is recovered from a latex and dispersed with moderate shear in a nonsolvent for vinylidene chloride polymers, such as a polyol used in the preparation of polyurethane materials. A dispersion of the powder and a polyol is eminently suited for use in the preparation of polyurethane foams to impart enhanced flame-retardancy and load-bearing properties thereto.
    Type: Grant
    Filed: September 15, 1978
    Date of Patent: November 4, 1980
    Assignee: The Dow Chemical Company
    Inventors: Dale S. Gibbs, Jack H. Benson, Reet T. Fernandez
  • Method of extruding thermoplastic resin foams having enlarged cell-sizes
    Patent number: 4229396
    Abstract: Extruded synthetic resinous thermoplastic foams of increased cell size are obtained when using volatile fluid blowing agents by incorporating a cell-size enlarging agent into the extruded composition, the cell-size enlarging agent being liquid at the foaming temperature and generally soluble in the heat-plastified foamable mixture.
    Type: Grant
    Filed: March 21, 1979
    Date of Patent: October 21, 1980
    Assignee: The Dow Chemical Company
    Inventors: Kyung W. Suh, Charles R. Amos
  • Method for the preparation of low temperature structure
    Patent number: 4226071
    Abstract: Masonry buildings for low temperature applications such as freezers and the like are insulated by applying the insulation on the exterior and providing an external vapor barrier.
    Type: Grant
    Filed: July 20, 1979
    Date of Patent: October 7, 1980
    Assignee: The Dow Chemical Company
    Inventor: Robert B. Bennett
  • Impact polymer process
    Patent number: 4221883
    Abstract: Rubber-reinforced alkenyl aromatic resinous polymers are prepared by polymerizing an alkenyl aromatic monomer such as styrene containing a reinforcing rubber until phase inversion occurs and subsequently adding an additional solution containing a reinforcing polymer such as rubber and containing polymerization.
    Type: Grant
    Filed: October 18, 1976
    Date of Patent: September 9, 1980
    Assignee: The Dow Chemical Company
    Inventors: Charles L. Mott, Bernie A. Kozakiewicz
  • Impact resistant resin containing compositions having reduced flammability
    Patent number: 4219466
    Abstract: A resin composition having high impact resistance, improved release property and reduced flammability is obtained by mixing a polymer containing a major amount of a monovinyl aromatic, monomer, a block copolymer consisting essentially of styrene and butadiene, an amorphous alpha-olefin polymer, a halide containing flame retardant compound, and an antimony compound.
    Type: Grant
    Filed: November 9, 1978
    Date of Patent: August 26, 1980
    Assignee: Asahi-Dow Limited
    Inventors: Kazuo Yoshida, Kunio Fukuda
  • Polymerization process
    Patent number: 4219630
    Abstract: In the preparation of impact-resistant alkenyl aromatic resinous polymers such as impact polystyrene containing halogenated monomer such as a brominated methacrylate, improved physical properties are obtained if the brominated monomer is added after phase inversion of the rubber and at a rate sufficiently slow as to maintain the identity of the rubber particles.
    Type: Grant
    Filed: June 6, 1977
    Date of Patent: August 26, 1980
    Assignee: The Dow Chemical Company
    Inventors: Donald C. Rulf, Edward F. Gurnee
  • Plug valve and method
    Patent number: 4219046
    Abstract: A thermoplastic lined plug valve is prepared using a plug having a nonlocking taper and a stem at the small end of the plug. The plug is seated initially by forcing the plug into the plug cavity, raising the temperature of the plug valve above the service temperature of the valve body lining until the valve body lining conforms to the valve plug. The valve is then cooled to a temperature below the service temperature of the body lining.
    Type: Grant
    Filed: July 17, 1978
    Date of Patent: August 26, 1980
    Assignee: The Dow Chemical Company
    Inventors: Walter H. West, E. D. Prueter
  • Tube extrusion die
    Patent number: 4212620
    Abstract: A readily adjustable tubing extrusion die has a laterally movable die ring which is clamped to the die body and slideable by means of positive positioning devices.
    Type: Grant
    Filed: July 3, 1978
    Date of Patent: July 15, 1980
    Assignee: The Dow Chemical Company
    Inventor: John W. McLaren
  • Multifunctional lithium containing initiator
    Patent number: 4205016
    Abstract: Highly desirable multifunctional lithium containing initiators are prepared by reacting a compound such as an organo lithium with an organic compound containing at least two 1,1-diphenylethylene groups. Such initiators can be prepared in the absence of polar solvents and are very desirable for the polymerization of dienes such as butadiene to a desirable 1,4 configuration. Several di-lithium compounds have been employed to initiate polymerization of various unsaturated organic monomers.
    Type: Grant
    Filed: August 7, 1978
    Date of Patent: May 27, 1980
    Assignee: The Dow Chemical Company
    Inventors: Lu H. Tung, Grace Y-S. Lo, Joseph W. Rakshys, Douglas E. Beyer
  • Manufacture of polytetrafluoroethylene tubes
    Patent number: 4203938
    Abstract: Polytetrafluoroethylene tubes are prepared by isostatic molding of polytetrafluoroethylene powder over a cylindrical mandral at a temperature below about 19.degree. C. The compacted preform and mandrel are then warmed to a temperature above about 19.degree. C. and the preform removed from the mandrel. Sticking of the preform to the mandrel is avoided.
    Type: Grant
    Filed: July 6, 1976
    Date of Patent: May 20, 1980
    Assignee: The Dow Chemical Company
    Inventors: Edward L. Burnett, Eugene V. Stack
  • Styrene-butadiene-acrylonitrile interpolymer latex based cement additives
    Patent number: 4202809
    Abstract: This invention is directed to cement additives consisting essentially of (1) a styrene-butadiene-acrylonitrile interpolymer latex, (2) a nonionic surfactant, (3) an anionic surfactant, and (4) a polyorganosiloxane foam depressant, which additives provide portland cement compositions having excellent strength properties.
    Type: Grant
    Filed: June 16, 1978
    Date of Patent: May 13, 1980
    Assignee: The Dow Chemical Company
    Inventor: R. Douglas Eash
  • Multifunctional lithium containing initiator
    Patent number: 4201729
    Abstract: Highly desirable multifunctional lithium containing initiators are prepared by reacting a compound such as an organo lithium with an organic compound containing at least two 1,1-diphenylethylene groups. Such initiators can be prepared in the absence of polar solvents and are very desirable for the polymerization of dienes such as butadiene to a desirable 1,4 configuration. Several di-lithium compounds have been employed to initiate polymerization of various unsaturated organic monomers.
    Type: Grant
    Filed: August 7, 1978
    Date of Patent: May 6, 1980
    Assignee: The Dow Chemical Company
    Inventors: Lu H. Tung, Grace Y-S. Lo, Joseph W. Rakshys, Douglas E. Beyer
  • Method and apparatus for reclaiming polymer from scrap plastic film rolls
    Patent number: 4200967
    Abstract: Scrap plastic film rolls are axially pushed onto a mandrel wherein at least one axial cut is made through the roll film, the film roll including the paper core is pushed toward a separator which strips the film from the core, the core is moved axially on the mandrel, slit and removed from the mandrel thereby separating plastic film and the core material.
    Type: Grant
    Filed: November 2, 1978
    Date of Patent: May 6, 1980
    Assignee: The Dow Chemical Company
    Inventor: Edward V. Dettmer
  • Multifunctional lithium containing initiator
    Patent number: 4200718
    Abstract: Highly desirable multifunctional lithium containing initiators are prepared by reacting a compound such as an organo lithium with an organic compound containing at least two 1,1-diphenylethylene groups. Such initiators can be prepared in the absence of polar solvents and are very desirable for the polymerization of dienes such as butadiene to a desirable 1,4 configuration. Several di-lithium compounds have been employed to initiate polymerization of various unsaturated organic monomers.
    Type: Grant
    Filed: December 12, 1977
    Date of Patent: April 29, 1980
    Assignee: The Dow Chemical Company
    Inventors: Lu H. Tung, Grace Y-S. Lo, Joseph W. Rakshys, Douglas E. Beyer
  • Method of making curved laminated panels
    Patent number: 4199389
    Abstract: Curved laminated sandwich panels having a plastic foam core and surface skins are prepared by applying pressure sensitive adhesive to at least one of adjacent faces to be joined, interposing a slip sheet between adjacent surfaces of the sheets to be laminated, positioning the sheets to be laminated within a matched die mold, removing the slip sheets and passing the matched die mold through pressure rolls to deform the sheets and conform them to the shape of the mold.
    Type: Grant
    Filed: May 26, 1976
    Date of Patent: April 22, 1980
    Assignee: The Dow Chemical Company
    Inventors: Albert J. Palfey, William P. Hovey
  • Soluble multifunctional lithium containing initiator
    Patent number: 4196154
    Abstract: Highly desirable organic liquid soluble multifunctional lithium containing initiators are prepared by reacting an organo lithium compound with an organic compound containing at least one group of the configuration 1,3-bis(1-phenylethenyl)benzene. Such initiators can be prepared in the absence of polar solvents and are very desirable for the polymerization of dienes such as butadiene to a desirable 1,4 configuration.
    Type: Grant
    Filed: August 7, 1978
    Date of Patent: April 1, 1980
    Assignee: The Dow Chemical Company
    Inventors: Lu H. Tung, Grace Y-S. Lo, Douglas E. Beyer