With Unsaturated Carboxylic Acid Or Ester Monomer Patents (Class 524/831)
  • Patent number: 4401789
    Abstract: Methods of preparing viscous aqueous polymer solutions having improved viscosity and stability properties for use in the treatment of subterranean hydrocarbon-containing formations and in enhanced oil recovery processes are provided. More particularly, a method of preparing such viscous aqueous polymer solution in a buffer system that contains a particular buffer and a substantially oxygen free aqueous solvent. Such solvent is used for pH control and contains one or more metal salts.
    Type: Grant
    Filed: July 14, 1981
    Date of Patent: August 30, 1983
    Assignee: Halliburton Company
    Inventor: Charles M. Gideon
  • Patent number: 4397984
    Abstract: An aqueous paper-coating composition which essentially comprises a finely divided pigment and an emulsion copolymer of(a) from 30 to 80% by weight of C.sub.4 -C.sub.8 -alkyl acrylates or mixtures of C.sub.4 -C.sub.8 -alkyl acrylates and di-(C.sub.4 -C.sub.8 -alkyl) maleates,(b) from 8 to 30% by weight of acrylic acid and/or methacrylic acid,(c) from 0 to 50% by weight of vinyl propionate, vinyl acetate, methyl acrylate, ethyl acrylate and/or vinyl .alpha.-branched C.sub.10 -monocarboxylate,(d) from 0 to 5% by weight of acrylamide, methacrylamide, vinylsulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid and/or acrylonitrile and(e) from 0 to 3% by weight of crosslinking monomers in the form of an aqueous dispersion, as the sole binder and thickener.
    Type: Grant
    Filed: January 11, 1982
    Date of Patent: August 9, 1983
    Assignee: BASF Aktiengesellschaft
    Inventors: Kurt Wendel, Guenther Addicks
  • Patent number: 4379874
    Abstract: There is disclosed a process for producing a novel polymer composition comprised of a polyacrylonitrile polymer and a block copolymer with acrylonitrile and non-crystalline polymer sequences wherein the polymer composition is formed by the removal of a solvent from a solution of a polyacrylonitrile polymer and a block copolymer with acrylonitrile and non-crystalline polymer sequences.
    Type: Grant
    Filed: July 7, 1980
    Date of Patent: April 12, 1983
    Inventor: Vladimir A. Stoy
  • Patent number: 4376850
    Abstract: Water miscible monomers such as acrylamide are polymerized in an aqueous phase in the presence of an initiator containing a borohydride such as sodium borohydride and an easily reduced metal ion such as cupric ion.
    Type: Grant
    Filed: May 18, 1981
    Date of Patent: March 15, 1983
    Assignee: The Dow Chemical Company
    Inventor: James W. Sanner
  • Patent number: 4371659
    Abstract: Aqueous polymer dispersions containing up to 75% by weight of polymer are prepared advantageously by emulsion copolymerization in the presence of conventional anionic emulsifiers, polymerization initiators and small amounts of polymerization inhibitors, at conventional polymerization temperatures, by copolymerizing at least two monomers A, which per se are not copolymerizable with one another, mixed with from 60 to 95% by weight of at least one monomer B, which is copolymerizable with both monomers A, in the presence of a polymerization inhibitor, by the emulsion feed process, wherein (a) the initial aqueous phase at the start of the monomer emulsion feed contains from 0.01 to 0.
    Type: Grant
    Filed: March 20, 1981
    Date of Patent: February 1, 1983
    Assignee: Basf Aktiengesellschaft
    Inventors: Wolfgang Druschke, Albrecht Kerckow, Bernd Stanger
  • Patent number: 4350622
    Abstract: An aqueous dispersion of a vinylidene chloride copolymer resin which, when coated onto a synthetic resinous film substrate, has the combined properties of: (1) good adhesion to the substrate; (2) good adhesion of a printing ink to the coating; (3) excellent barrier to gases (especially oxygen) and water vapor; and (4) a high resistance to a boiling water treatment. The dispersion must contain methacrylic acid in an amount of from about 1.times.10.sup.-4 to about 3.times.10.sup.-4 moles per gram of polymer solids content. The dispersion must also have a molar ratio of acrylonitrile to methyl methacrylate of from about 0 to 1 to about 1 to 1. A limited portion of the amount of methacrylic acid is contained in the aqueous phase. The remaining amount of methacrylic acid is polymerized with the vinylidene chloride.
    Type: Grant
    Filed: August 10, 1981
    Date of Patent: September 21, 1982
    Assignee: Asahi-Dow Limited
    Inventors: Kazuhiko Hiyoshi, Norio Matsuura, Michiharu Matsugichi, Norio Onofusa, Tadao Nishikage
  • Patent number: 4336172
    Abstract: Aqueous dispersions containing from 30% to 70% by weight of cross-linkable copolymers based on esters of (meth)acrylic acid comprising esters of (meth)acrylic acid and/or styrene, and other ethylenically-unsaturated compounds copolymerizable therewith and from 1% to 15% by weight based on the total weight of the copolymer, of allyl esters of .alpha.-hydroxycarboxylic acids. These dispersions can be used as a base of stoving enamels, which can be hardened to obtain coats of great surface hardness and great flexibility on metals.
    Type: Grant
    Filed: June 11, 1980
    Date of Patent: June 22, 1982
    Assignee: Wacker-Chemie GmbH
    Inventors: Klaus Marquardt, Herbert Eck, Werner Bathelt
  • Patent number: 4327004
    Abstract: An aqueous dispersion of a synthetic polymer of average diameter in the range of 50 to 500 nm and especially above 75 nm is disclosed, the aqueous dispersion having a solids content of 5 to 50 parts by weight per 100 parts per weight of total dispersion. The aqueous dispersion is provided by effecting polymerization in the presence of an emulsifier which comprises an alkali metal salt of a polysulfonic acid of an alkane of medium chain length e.g. 8 to 22 carbon atoms.
    Type: Grant
    Filed: July 30, 1980
    Date of Patent: April 27, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Adolf Schmidt, August Bockmann