Patents Assigned to Polysar
  • Pressure sensitive adhesives
    Patent number: 4508864
    Abstract: Improved aqueous based pressure sensitive adhesive compositions are disclosed comprising a latex of a carboxylated butadiene-styrene polymer and a tackifier resin.
    Type: Grant
    Filed: October 7, 1983
    Date of Patent: April 2, 1985
    Assignee: Polysar Limited
    Inventor: Ivan S. Lee
  • Polymer recovery
    Patent number: 4504654
    Abstract: An improved process is provided for the recovery of a polymer from a solution thereof in an organic solvent by contact with steam and water wherein economics in the use of energy are achieved by controlling the contact of said solution with steam and water to provide a predetermined amount of residual solvent in the polymer, said contact being under conditions of controlled temperature and pressure. Such a process may be used for the recovery, for example, of polybutadiene from a solution in a benzene-butene-1 mixture.
    Type: Grant
    Filed: September 16, 1982
    Date of Patent: March 12, 1985
    Assignee: Polysar Limited
    Inventor: John P. Duffy
  • Polymer hydrogenation process
    Patent number: 4503196
    Abstract: A process is provided for the selective hydrogenation of the carbon-carbon double bonds in a copolymer of a conjugated diene and one or more copolymerizable monomers which comprises hydrogenating the copolymer in the presence of a monovalent rhodium hydride complex catalyst of the general formula RhHL.sub.x wherein x is 3 or 4 and L is a ligand compound. The hydrogenation is carried out in an organic solvent in which the copolymer and catalyst are soluble and in the absence of additional ligand compound.
    Type: Grant
    Filed: October 12, 1983
    Date of Patent: March 5, 1985
    Assignee: Polysar Limited
    Inventors: Garry L. Rempel, Hormoz Azizian
  • Foam rubber backings for composite materials having glass fiber substrates coated with PVC
    Patent number: 4500591
    Abstract: Composite materials having glass fiber substrates and attached foam backings are useful in surface covering applications especially as resilient floor coverings. The glass fiber substrates are usually coated with a plastisol of polyvinyl chloride. Conventional foam rubber backings made from high solids SBR latex have poor adhesion to such coated substrates. However this problem may be overcome by using foam rubber backings made from a blend of SBR and NBR latices, which backings have excellent adhesion to these coated substrates.
    Type: Grant
    Filed: June 21, 1983
    Date of Patent: February 19, 1985
    Assignee: Polysar International S.A.
    Inventors: Gerard Peltier, Michel Longuet, Charles A. Midgley
  • Coagulation
    Patent number: 4499213
    Abstract: An improved process is provided for the coagulation from the latex of a carboxylated styrenebutadiene polymer, the improvement being adjusting the pH of the latex to between about 6.5 and about 7.5 and adding an emulsifier mixture which contains, based on 100 parts by weight of polymer in the latex, from about 3 to about 6 parts by weight of the alkali metal salt of a fatty acid and from about 1.5 to about 3.5 parts by weight of the alkali metal salt of a rosin acid.
    Type: Grant
    Filed: September 12, 1983
    Date of Patent: February 12, 1985
    Assignee: Polysar Limited
    Inventor: Kyosaku Sato
  • Process for making vulcanized carbon black-reinforced bromobutyl rubber films
    Patent number: 4486562
    Abstract: A process is provided for preparing a vulcanized carbon black-reinforced chloro- or bromobutyl rubber film comprising admixing a polyfunctional amine vulcanization system with a carbon black-reinforced chloro- or bromobutyl rubber latex containing one or more selected emulsifiers, forming a film from the resulting mixture, drying said film and heating the dried film to provide the vulcanized film. The process may be used in the manufacture of coatings, dipped goods and chemical resistant impermeable treated fabrics.
    Type: Grant
    Filed: March 16, 1984
    Date of Patent: December 4, 1984
    Assignee: Polysar Limited
    Inventors: Erhardt Fischer, Douglas C. Edwards
  • Silica-polymer mixtures
    Patent number: 4482657
    Abstract: A process is provided for producing a silica-synthetic polymer mixture by mixing silica, water and an alkyl trimethylammonium halide, adding this mixture to a latex of the synthetic polymer, coagulating the mixture and recovering the silica-polymer mixture. Such mixtures may be used for the production of rubbery vulcanizates such as shoe soles, light colored shaped articles and the like.
    Type: Grant
    Filed: July 12, 1983
    Date of Patent: November 13, 1984
    Assignee: Polysar Limited
    Inventors: Erhardt Fischer, Douglas C. Edwards
  • Coated papers
    Patent number: 4477535
    Abstract: Paper having enhanced gloss and pick resistance may be prepared using as a binder a latex of heterogeneous particles having a core and shell type structure. The polymer particles have a composition such that the shell is harder than the core.
    Type: Grant
    Filed: May 9, 1983
    Date of Patent: October 16, 1984
    Assignee: Polysar International S.A.
    Inventors: Alvin R. Sinclair, Edward H. Gleason
  • Polyalkylene glycol stabilized alkali swellable latex
    Patent number: 4474919
    Abstract: The upward drift in viscosity which is characteristic of paper coating compositions prepared from alkali-swellable latices to which alkali has been added can be arrested at any desired level by including in the coating composition 0.1-10 parts by weight, per 100 parts by weight of dry solids in the uncompounded alkali-swellable latex, of a poly- C.sub.2-4 alkylene glycol having an average molecular weight of about 100-5,000. Polyethylene and polypropylene glycols having molecular weights of about 1,200 are shown to produce excellent results with latices of carboxylic copolymers of butadiene and styrene.
    Type: Grant
    Filed: April 5, 1982
    Date of Patent: October 2, 1984
    Assignee: Polysar Limited
    Inventors: Elsa S. Polatajko-Lobos, Zbigniew J. Lobos
  • Adhesives and uses thereof
    Patent number: 4471082
    Abstract: An adhesive composition comprising a mixture of water based polymer in latex form and a material generally referred to as a thickening agent is disclosed for removably adhering a product to a substrate, for example a carpet with an attached backing to a flooring substrate. The adhesive may be applied as a layer to the carpet backing, dried and subsequently activated with water to adhere the carpet to the floor. After drying, the adhesive layer may be reactivated with water to permit the carpet to be removed from the floor. The adhesive layer when dried on the surface of a latex foam backed carpet provides a non-tacky surface which additionally increases the abrasion resistance of the latex foam backing thereby reducing damage to the backing during normal storage and handling.
    Type: Grant
    Filed: December 8, 1982
    Date of Patent: September 11, 1984
    Assignee: Polysar Limited
    Inventors: John C. Kwok, Ivan S. Lee
  • Polymer hydrogenation process
    Patent number: 4464515
    Abstract: A process is provided for the selective hydrogenation of the carbon-carbon double bonds in a copolymer of a conjugated diene and one or more copolymerizable monomers comprising hydrogenating the copolymer in the presence of (i) a monovalent rhodium hydride complex catalyst, (ii) a ligand compound, and (iii) a solvent for the copolymer, catalyst and ligand compound.
    Type: Grant
    Filed: October 11, 1983
    Date of Patent: August 7, 1984
    Assignee: Polysar Limited
    Inventors: Gary L. Rempel, Hormoz Azizian
  • Bonding elastomers
    Patent number: 4457799
    Abstract: An improved method is provided for bonding together layers of fluoroelastomer compound and butadiene-acrylonitrile polymer compound by incorporating into one or both of the compounds a polysulphidic silane compound prior to vulcanization. There is also provided a vulcanized hose having an inner layer of fluoroelastomer compound and an outer layer of a butadiene-acrylonitrile polymer compound containing a polysulphidic silane compound incorporated into either layer.
    Type: Grant
    Filed: February 17, 1983
    Date of Patent: July 3, 1984
    Assignee: Polysar Limited
    Inventor: John R. Dunn
  • Water clarification
    Patent number: 4456534
    Abstract: This invention is directed to an improved process for clarifying a waste water stream containing waste synthetic polymeric material in latex form. The process comprises treating the waste water stream in sequence with calcium chloride and a cationic flocculant, calcium, potassium or sodium hydroxide, and an anionic flocculant. The aggregated polymeric material which results is then separated from the waste water and an essentially clear waste water stream is thereby provided.
    Type: Grant
    Filed: July 20, 1982
    Date of Patent: June 26, 1984
    Assignee: Polysar International S.A.
    Inventors: Jean-Pierre Lambert, Michel L'Huillier
  • Carboxylated nitrile rubber/PVC/nylon flux blends
    Patent number: 4438230
    Abstract: Vulcanizable polymer compositions, comprising a polymer blend and a curative system, and a process for preparing the compositions are provided. The polymer blend comprises a flux blend of a PVC, a carboxylated nitrile rubber and a nylon having a melting point of less than about 210.degree. C., and stabilizers. Vulcanizates of the polymer compositions have improved properties and may be used, for example, in spinning cots.
    Type: Grant
    Filed: November 29, 1982
    Date of Patent: March 20, 1984
    Assignee: Polysar Limited
    Inventor: Herbert F. Schwarz
  • Carboxylated acrylate styrene butadiene adhesives
    Patent number: 4438232
    Abstract: An adhesive composition having improved properties for pressure sensitive adhesive applications has been developed comprising a latex of a polymer formed by polymerizing 40-10 percent vinyl or vinylidene monoaromatic monomer, 45-70 percent C.sub.4-6 cojugated diene, 1-5 percent unsaturated acid, and 5-30 percent C.sub.1-8 alkyl ester of acrylic or methacrylic acid. The adhesive preferably also contains a tackifier resin. The adhesive is useful on a number of applications including the manufacture of labels and tapes.
    Type: Grant
    Filed: August 10, 1982
    Date of Patent: March 20, 1984
    Assignee: Polysar Limited
    Inventor: Ivan S. Lee
  • Process for preparing curable compounds
    Patent number: 4433077
    Abstract: A process is provided for the production of soft compounds which are curable by heat to rubbery elastomers which process comprises mixing in a trough type blade mixer a butadiene-acrylonitrile polymer, filler, tackifying resin, plasticizer, a polymerizable monomer and an organic peroxidic compound. The soft compounds may be used as gunnable or spreadable compounds or for gasketing or jointing purposes and cured in situ.
    Type: Grant
    Filed: August 23, 1982
    Date of Patent: February 21, 1984
    Assignee: Polysar Limited
    Inventor: Keith A. Callander
  • Polymer mixtures comprising polyethylene and 1,4 polybutadiene
    Patent number: 4426497
    Abstract: A polymeric covering material is provided which is prepared by crosslinking a mixture comprising a polyethylene and a polybutadiene. Such material may be used as a heat shrinkable film, for splice covering tubes and as a protective coating for articles.
    Type: Grant
    Filed: March 18, 1982
    Date of Patent: January 17, 1984
    Assignee: Polysar Limited
    Inventor: Eric G. Kent
  • Polyethylene-polybutadiene blend
    Patent number: 4423181
    Abstract: Compositions having improved low temperature impact strength are provided which comprise a mixture of high density polyethylene and polybutadiene. Such compositions may be used for coating of pipes, especially for Arctic-type use conditions or for containers for low temperature use.
    Type: Grant
    Filed: June 14, 1982
    Date of Patent: December 27, 1983
    Assignee: Polysar Limited
    Inventor: Eric G. Kent
  • Rubber recovery apparatus
    Patent number: 4413971
    Abstract: Apparatus is provided for the recovery of dry polymer in porous crumb form in which pellets of polymer containing volatile material from a cutter located at the output end of an extrusion device are conveyed by a first gas stream from the cutter through a first pipe means to a cyclone separator. A second pipe means is supplied with and conveys a second gas stream to the cyclone separator, both the first and second pipe means terminating at and forming an entry to the cyclone separator in which the pellets are cooled and separated from the gas streams and volatile material. The pellets are then removed from the cyclone separator and conveyed to weighing and packaging means.
    Type: Grant
    Filed: May 11, 1982
    Date of Patent: November 8, 1983
    Assignee: Polysar Limited
    Inventor: James S. Nettleton
  • Hard shell soft core latex
    Patent number: 4413068
    Abstract: Paper coating compositions manufactured from a novel latex comprising about 40 to 60 weight percent of heterogeneous polymer particles which have:(1) an initial domain, comprising about 50% by volume of the particle which is a polymer of a monomer composition comprising:(a) From about 55 to about 65 parts by weight of a monovinylidene aromatic monomer;(b) From about 45 to about 35 parts by weight of an aliphatic C.sub.4-6 conjugated diene monomer; and per 100 parts by weight of the total of said monovinylidene aromatic monomer and said aliphatic C.sub.4-6 conjugated diene monomer;(c) from about 0.5 to 5 parts by weight of C.sub.3-5 ethylenically unsaturated carboxylic acid; and(d) from about 0.5 to 5 parts by weight of a C.sub.
    Type: Grant
    Filed: July 2, 1981
    Date of Patent: November 1, 1983
    Assignee: Polysar International S.A.
    Inventors: Alvin R. Sinclair, Edward H. Gleason