Patents Represented by Attorney Gordon B. Seward
  • Patent number: 5328953
    Abstract: Alkyloxyalkanoic acids, salts or esters having the formulaR.sup.1 --O--(CR.sup.3 R.sup.4).sub.x CO.sub.2 R.sup.2where R.sup.1 represents an alkyl or alkenyl group, or a hydroxy- or alkoxy- substituted alkyl or alkenyl group, said group containing (apart from the alkoxy carbon atoms in an alkoxy-substituted alkyl or alkenyl group) from 1 to 22 carbon atoms, R.sup.2 represents hydrogen, a metallic or other cationic group, each of R.sup.3 and R.sup.4 represents independently hydrogen or an alkyl group, and x has a value of from 1 to 10, act as agents useful for modifying rubber properties. Compared with conventional processing aids, they improve the processing characteristics of unvulcanised rubber compositions and can have beneficial effect on the physical properties of vulcanisates obtained by the vulcanisation of such compositions.
    Type: Grant
    Filed: September 11, 1992
    Date of Patent: July 12, 1994
    Assignee: Monsanto Europe S.A./N.V.
    Inventor: Eric R. Lynch
  • Patent number: 5311767
    Abstract: The invention relates to an instrument and method for measuring the viscoelastic properties of rubber and like materials comprising two opposed dies, each die having a die housing, the dies and housings being moveable between an open position and a closed position, and wherein: a) each die is separated from its housing by a substantially uniform circumferential gap such that the die is rotatable relative to its housing, and one die is rotatable relative to the other, b) in the closed position, the two dies define between them a cavity for holding under pressure a sample of material to be tested, c) the design of the dies and housings is such that during movement from the open position to the closed position, a sample of test material located between the dies is compressed so that excess material is extruded radially from between the dies, across the gap between each die and its housing and through a narrowing space separating the housings until the two housings reach their closed position, in which position t
    Type: Grant
    Filed: April 23, 1992
    Date of Patent: May 17, 1994
    Assignee: Monsanto PLC
    Inventors: Michael Mathews, David G. Rusling, Michael J. Stolc
  • Patent number: 5309768
    Abstract: A method of operating an instrument for testing the physical properties of materials in which each of a series of samples of the material to be tested is placed in a test position located between dies, the dies are closed to mould the material to a test shape, a test is carried out on the sample in the mould and after completion of the test the dies are opened and the sample is removed from the test position is characterised in that a film of material which is substantially non-adhesive to the dies under the conditions of the test is provided to cover those surfaces of the sample which, in the absence of the film, would be in contact with the dies, each sample in turn is conveyed to the test position, and mechanical elements are provided for removing each sample from the test position after the completion of the test. Apparatus suitable for use in the method of the invention is also provided.
    Type: Grant
    Filed: April 23, 1992
    Date of Patent: May 10, 1994
    Assignee: Monsanto Company
    Inventors: Michael Mathews, David G. Rusling, Michael J. Stolc, Robert I. Barker
  • Patent number: 5260454
    Abstract: Heterocyclic thiol sulfenimide compounds are useful as an accelerator in the curing of natural and/or synthetic rubbers. The compound can be represented by the formula ##STR1## wherein each of A.sup.1 and A.sup.2, independently, is at least one heterocyclic ring containing one or more nitrogen atoms therein, or at least one heterocyclic ring containing one or more nitrogen atoms therein and (1) one or more hydrocarbyl substituents, or (2) one or more electron withdrawing groups, or (3) one or more electron releasing groups, wherein A.sup.
    Type: Grant
    Filed: February 8, 1993
    Date of Patent: November 9, 1993
    Assignee: Monsanto Company
    Inventor: Charles J. Rostek, Jr.
  • Patent number: 5204481
    Abstract: An improved process for producing N-alkyl or N-cycloalkyl-2-benzothiazole sulfenimides uses aliphatic hydrocarbons as a reaction medium in converting N-alkyl or N-cycloalkyl-2-benzothiazole sulfenamides to the corresponding sulfenimides by reaction with an acid.
    Type: Grant
    Filed: June 8, 1992
    Date of Patent: April 20, 1993
    Assignee: Monsanto Company
    Inventors: Sharen B. Carroll, Horng-Jau Lin, Roger K. Rains
  • Patent number: 5189174
    Abstract: Heterocyclic thiol sulfenimide compounds are useful as an accelerator in the curing of natural and/or synthetic rubbers. The compound can be represented by the formula ##STR1## wherein each of A.sup.1 and A.sup.2, independently, is at least one heterocyclic ring containing one or more nitrogen atoms therein, or at least one heterocyclic ring containing one or more nitrogen atoms therein and (1) one or more hydrocarbyl substituents, or (2) one or more electron withdrawing groups, or (3) one or more electron releasing groups, wherein A.sup.
    Type: Grant
    Filed: September 23, 1991
    Date of Patent: February 23, 1993
    Assignee: Monsanto Company
    Inventor: Charles J. Rostek, Jr.
  • Patent number: 5102945
    Abstract: Butadiene polymer rubber compositions containing a polymeric activator have particularly beneficial characteristics. The activator is an interpolymer of 2-vinylpyridine monomer and 1,3-butadiene monomer, optionally with styrene, which interpolymer contains from 20% to 65% by weight of vinylpyridine units, and is mostly insoluble in boiling tetrahydrofuran.
    Type: Grant
    Filed: November 14, 1990
    Date of Patent: April 7, 1992
    Assignee: Monsanto Company
    Inventors: Aubert Y. Coran, Leonard H. Davis
  • Patent number: 5100947
    Abstract: A dynamically vulcanized composition comprising a polyolefin resin and an elastomer is provided in which a major portion of fillers or specified additives are present in the polyolefin resin. A process for producing the dynamically vulcanized composition is also provided including the addition of the fillers and/or specified additives after the dynamic vulcanization step. The compositions have improved stiffness to impact balance.
    Type: Grant
    Filed: March 19, 1990
    Date of Patent: March 31, 1992
    Assignee: Advanced Elastomer Systems, L. P.
    Inventors: Robert C. Puydak, Donald R. Hazelton, Blair A. Graham, Narayanaswami R. Dharmarajan
  • Patent number: 5096978
    Abstract: Synthetic rubber compositions are disclosed which have improved properties of scorch delay and cure rate. Substituted urea coactivators are generally used in addition to a conventional accelerator.
    Type: Grant
    Filed: October 3, 1988
    Date of Patent: March 17, 1992
    Assignee: Monsanto Company
    Inventor: Aubert Y. Coran
  • Patent number: 5086121
    Abstract: Thermoplastic compositions of matter useful as gasketing materials as well as flexible boots and seals which are soft, have low compression set and high tensile. The compositions comprise a polyolefin resin and at least two different rubbers, one of which is vulcanized to a fully cured state by a cure systems which leaves the other rubber(s) unvulcanized. The preferred embodiment comprises a blend of polypropylene and ethylene vinylacetate as the polyolefin resin component, EPDM as the uncured rubber component and a ZnO cured halogenated butyl rubber. In another embodiment of the invention, the resin is excluded and the uncured rubber is a high crystallinity EPDM.
    Type: Grant
    Filed: July 20, 1990
    Date of Patent: February 4, 1992
    Assignee: Advanced Elastomer Systems, L. P.
    Inventors: Donald R. Hazelton, Robert C. Puydak, D. A. Booth
  • Patent number: 5079956
    Abstract: In a method of testing a sample of viscoelastic material held under pressure between two opposing, temperature-controlled dies, the sample is subjected to an oscillatory, rotary shearing force which has a predetermined amplitude and a frequency within the range 0.001 to 2 Hz, and a torque which is indicative of the response of the sample to the shearing force is measured, at least one measurement of the torque being made when the predetermined amplitude is at least .+-.10.degree. but not greater than .+-.360.degree..
    Type: Grant
    Filed: September 17, 1990
    Date of Patent: January 14, 1992
    Assignee: Monsanto Europe, S.A.
    Inventors: Henri A. G. Burhin, David P. J. King, Willy A. G. Spreutels
  • Patent number: 5081179
    Abstract: A thermoplastic elastomer composition comprising (A) 10-90 parts by weight of crystalline polypropylene, (B) 10-90 parts by weight of brominated butyl rubber, (C) 10-120 parts by weight of olefinic copolymer rubber to 100 parts by weight of (A)+(B), and (D) 10-150 parts by weight of process oil as plasticizer to 100 parts by weight (A)+(B), all of which are dynamically vulcanized in the presence of a peroxide crosslinking agent.The thermoplastic elastomer composition of this invention has a high gel ratio or gel content in part because brominated butyl rubber is vulcanized with peroxide. The composition has good elasticity, high mechanical strength, low compressively permanent set, excellent long-term heat stability, moldability, and gas impermeability and high damping characteristic.
    Type: Grant
    Filed: October 23, 1989
    Date of Patent: January 14, 1992
    Assignee: Advanced Elastomer Systems, L. P.
    Inventors: Eiji Sezaki, Yoshikazu Murakami, Shuji Shimada, Masaaki Saito, Masatoshi Akami, Hisafumi Endo
  • Patent number: 5079305
    Abstract: Heterocyclic thiol sulfenimide compounds are useful as an accelerator in the curing of natural and/or synthetic rubbers. The compound can be represented by the formula ##STR1## wherein each of A.sup.1 and R.sup.2, independently, is at least one heterocyclic ring containing one or more nitrogen atoms therein, or at least one heterocyclic ring containing one or more nitrogen atoms therein and (1) one or more hydrocarbyl substituents, or (2) one or more electron withdrawing groups, or (3) one or more electron releasing groups, wherein A.sup.
    Type: Grant
    Filed: September 5, 1989
    Date of Patent: January 7, 1992
    Assignee: Monsanto Company
    Inventor: Charles J. Rostek, Jr.
  • Patent number: 5070111
    Abstract: A process of making a foamed thermoplastic elastomer is disclosed, and the foam thus produced. The thermoplastic elastomers, which are blends of 90 to 10 parts of rubber and 10 to 90 parts of crystalline polyolefin plastic, are melted, admixed with water under pressure, and released to atmospheric pressure. The resultant foam has good cell structure and low density, and a high percentage of closed (as opposed to interconnecting) cells.
    Type: Grant
    Filed: March 13, 1991
    Date of Patent: December 3, 1991
    Assignee: Advanced Elastomer Systems, L.P.
    Inventor: Garry L. Dumbauld
  • Patent number: 5070146
    Abstract: Butadiene polymer rubber compositions containing a polymeric activator have particularly beneficial characteristics. The activator is an interpolymer of a vinylpyridine monomer and a diene hydrocarbon monomer which interpolymer contains from 20% to 65% by weight of vinylpyridine units. Composite articles made from these rubber compositions together with contiguous portions of a dissimilar rubber compound show greater strength and adhesion as a result of the presence of a activator in the butadiene polymer rubber composition.
    Type: Grant
    Filed: July 18, 1989
    Date of Patent: December 3, 1991
    Assignee: Monsanto Company
    Inventors: Aubert Y. Coran, Leonard H. Davis
  • Patent number: 5053450
    Abstract: Compositions of acrylic rubber and another rubber which can be nitrile rubber, hydrogenated nitrile rubber, fluoroelastomer, silicone rubber, or fluorosilicone rubber are described, in which the acrylic rubber is at least partially crosslinked. The compositions are millable and processable and, by the addition of curatives for the nitrile rubber, hydrogenated nitrile rubber, fluoroelastomer, silicone rubber, or fluorosilicone rubber, can be further crosslinked to become vulcanizates which exhibit excellent resistance to the effects of hot air, hot oil, and ozone.
    Type: Grant
    Filed: October 16, 1989
    Date of Patent: October 1, 1991
    Assignee: Monsanto Company
    Inventor: Aubert Y. Coran
  • Patent number: 5051480
    Abstract: Compositions of acrylic rubber and another rubber which can be nitrile rubber, hydrogenated nitrile rubber, fluoroelastomer, silicon rubber, or fluorosilicone rubber are described, in which the acrylic rubber can be uncured or at least partially crosslinked. The compositions are millable and processable and, by the addition of curatives for the nitrile rubber, hydroganted nitrile rubber, fluoroelastomer, siloicone rubber, or fluorosilicone rubber, can be further crosslinked to become vulcanizates which exhibit excellent resistance to the effects of hot air, hot oil, and ozone. The acrylic rubber is a copolymers from alkyl acrylate monomer which copolymer contains no crosslinking sites other than acrylate ester sites, and can be crosslinked by reaction with a paraffinic alcohol.
    Type: Grant
    Filed: October 16, 1989
    Date of Patent: September 24, 1991
    Assignee: Monsanto Company
    Inventor: Aubert Y. Coran
  • Patent number: 5051478
    Abstract: A dynamically vulcanized composition is provided which comprises a polyolefin resin, an elastomer, and an ethylene copolymer resin such as a copolymer of ethylene and vinyl acetate or an alkyl acrylate. A process for producing the dynamically vulcanized composition is also provided, which process includes the addition of the ethylene copolymer resin after the dynamic vulcanization step. The resulting composition comprises the ethylene copolymer resin predominantly in the polyolefin resin phase. The compositions have improved surface appearance and softness.
    Type: Grant
    Filed: July 26, 1990
    Date of Patent: September 24, 1991
    Assignee: Advanced Elastomer Systems, L. P.
    Inventors: Robert C. Puydak, Donald R. Hazelton
  • Patent number: 5051477
    Abstract: A dynamically vulcanized thermoplastic composition is provided which comprises a polymer blend of a polyolefin resin, a halogenated elastomeric copolymer, such as a halogenated butyl rubber, or a halogenated copolymer of a C.sub.4 to C.sub.7 isomonoolefin and a para-alkylstyrene, and a halogenated polyethylene. The composition has improved flame retarding properties. Additional flame retarding additives may be incorporated in the composition. The dynamically vulcanized thermoplastic composition is suitable for use in roofing sheets.
    Type: Grant
    Filed: May 4, 1990
    Date of Patent: September 24, 1991
    Assignee: Advanced Elastomer Systems, L. P.
    Inventors: Thomas C. Yu, Robert C. Puydak, Charles W. Degener
  • Patent number: 5036133
    Abstract: Sulfur curable rubber compositions have improved properties such as cure rate and scorch delay when prepared by using an organic accelerator and a co-activator which is an interpolymer made from vinylpyridine and one or more diene monomers. The amount of the vinylpyridine units in the co-activator is generally from about 10 percent to about 75 percent by weight. The rubber compositions can contain either carbon black or silica.
    Type: Grant
    Filed: October 12, 1989
    Date of Patent: July 30, 1991
    Assignee: Monsanto Company
    Inventor: Aubert Y. Coran