Patents Represented by Attorney Myron B. Kurtzman
  • Patent number: 5417930
    Abstract: A novel chemical reactor: one particularly useful for the production of polymers, especially elastomers such as butyl rubber. The reactor contains (1) a two-tube pass system, constituted of an inner or center tube bundle through which a mixture or slurry of polymerizable monomers and catalyst is passed in one direction, and recycled via an outer tube bundle in the opposite direction in essentially even flow distribution, (2) while the tubes of the center and outer tubular bundles are maintained within a jacketed section, or sections of the reactor into which a coolant, or refrigerant, is injected and vaporized to remove the heat of reaction. The coolant, or refrigerant, in heat exchange relationship with the tubes removes the exothermic heats of reaction from the polymerization mixture, and maintains the polymerization mixture at uniformly low temperature.
    Type: Grant
    Filed: June 21, 1994
    Date of Patent: May 23, 1995
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Michael F. McDonald, Jr., David J. Lawrence, Donald A. Williams
  • Patent number: 5397837
    Abstract: A compatibilized polymer blend composition is provided which comprises a uniform admixture of a halogenated copolymer of an isomonoolefin, such as polyisobutylene, and a para-alkylstyrene, such as para-methylstyrene blended with a carboxy-modified elastomer. Blends also containing an unmodified elastomer are provided wherein the carboxy-modified elastomer serves to compatibilize the unmodified elastomer and the halogenated copolymer.
    Type: Grant
    Filed: May 11, 1993
    Date of Patent: March 14, 1995
    Assignee: Exxon Chemical Patents Inc.
    Inventor: Palanisamy Arjunan
  • Patent number: 5396021
    Abstract: A process for reducing the loss of monomers from a polymerization recycle stream comprising steam treating a molecular sieve used to dry the recycle stream to remove acidic sites within the sieve. The steam treatment is conducted at a temperature of between 150.degree. C. and 300.degree. C. for 2 to 24 hours.
    Type: Grant
    Filed: September 23, 1992
    Date of Patent: March 7, 1995
    Assignee: Exxon Chemical Products Inc.
    Inventors: William G. DePierri, Michael F. McDonald, Jr., Albert E. Schweizer
  • Patent number: 5386864
    Abstract: A composition suitable for use in producing a tire innerliner is provided. The composition comprises a halogen-containing copolymer of a C.sub.4 to C.sub.7 isomonoolefin and a para-alkylstyrene; carbon black, and a plasticizer oil. A vulcanized tire comprising an innerliner made from the composition is also provided.
    Type: Grant
    Filed: April 26, 1994
    Date of Patent: February 7, 1995
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Bernard J. Costemalle, James V. Fusco
  • Patent number: 5382630
    Abstract: Linear ethylene interpolymer blends are disclosed. The blends are made from components having a narrow molecular weight distribution (e.g. M.sub.w /M.sub.n .ltoreq.3) and a narrow composition distribution (e.g. CDBI>50%). The blend components in a blend can all have the same molecular weight but different comonomer contents, the same comonomer content but different molecular weights, or comonomer contents which increase with molecular weight. The blends have either M.sub.w /M.sub.n >3 or CDBI<50%, or both, and can be multimodal with respect to either or both molecular weight and/or comonomer content. The blends are generally free of blend components having both a higher average molecular weight and a lower average comonomer content than another blend component. The blends can have improved mechanical, physical and/or chemical properties.
    Type: Grant
    Filed: February 4, 1993
    Date of Patent: January 17, 1995
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Ferdinand C. Stehling, Charles S. Speed, Curtis H. Welborn, Jr.
  • Patent number: 5369182
    Abstract: The invention relates to impact modifiers for polyamide compositions which improve the impact strength of the polyamides without adversely affecting the flexural modulus of the composition. The impact modifiers comprise blends of halogenated copolymers of a C.sub.4 to C.sub.7 isomonoolefin and an alkyl/styrene with a polyolefin.
    Type: Grant
    Filed: February 22, 1994
    Date of Patent: November 29, 1994
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Thomas C. Yu, Kenneth W. Powers, Hsien C. Wang
  • Patent number: 5356950
    Abstract: A grafted polymer of an isomonoolefin and an alkylstyrene, such as a maleic anhydride-grafted copolymer of isobutylene and para-methylstyrene, is provided. Processes for preparing the grafted polymer are also provided.
    Type: Grant
    Filed: April 26, 1993
    Date of Patent: October 18, 1994
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Donald A. White, Hsien C. Wang
  • Patent number: 5334700
    Abstract: Ethylene, 2-methylene-1,3-dioxepane, and optionally carbon monoxide are reacted in the presence of a free radical catalyst to form a biodegradable and optionally photodegradable polymer represented by the formulae: ##STR1## where x and y are integers or ##STR2## where x, y and z are integers.
    Type: Grant
    Filed: November 1, 1993
    Date of Patent: August 2, 1994
    Assignee: Exxon Chemical Patents Inc.
    Inventor: Richard G. Austin
  • Patent number: 5332787
    Abstract: A process is provided for vulcanizing a halogen-containing copolymer of a C.sub.4 to C.sub.7 isomonoolefin and a para-alkylstyrene utilizing a vulcanization mixture comprising a basic zinc carbonate hydroxide.
    Type: Grant
    Filed: November 30, 1992
    Date of Patent: July 26, 1994
    Assignee: Exxon Chemical Patents Inc.
    Inventor: Irwin J. Gardner
  • Patent number: 5331049
    Abstract: A water-curable hot melt adhesive system is disclosed. The system uses silane hydrolyzable functionality grafted onto an ethylene polymer component, and a tackifier compatible therewith. The ethylene polymer component is a copolymer of ethylene and a hydrocarbyl ester of an .alpha.,.beta.-ethylenically unsaturated carboxylic acid, and the tackifier component provides the adhesive with sufficient silanol condensation catalytic activity to accelerate water curing. The formulation is applied to a substrate surface as a hot melt at a moderate temperature, and subsequently cured by moisture or in a warm water bath. The invention also embodies structural compositions having glass, metallic or leather surfaces adhered with the adhesive and a method for making structural composites.
    Type: Grant
    Filed: June 22, 1990
    Date of Patent: July 19, 1994
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Jay D. Audett, Mun F. Tse
  • Patent number: 5324800
    Abstract: Catalysts comprising (a) derivatives of mono, bi and tricyclopentadienyl coordination complexes with a transition metal and (b) and an alumoxane are employed in a process of producing polyolefins of controlled molecular weight.
    Type: Grant
    Filed: August 30, 1991
    Date of Patent: June 28, 1994
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Howard C. Welborn, Jr., John A. Ewen
  • Patent number: 5317070
    Abstract: A hot melt adhesive including syndiotactic polypropylene having a polymer chain of at least 80% racemic dyads and having a melting point of about 100.degree. C. to 180.degree. C.
    Type: Grant
    Filed: August 25, 1992
    Date of Patent: May 31, 1994
    Assignee: Exxon Chemical Patents, Inc.
    Inventors: Patrick Brant, Kenneth O. McElrath, Jr., Martha H. Robertson
  • Patent number: 5281681
    Abstract: Ethylene, 2-methylene-1,3-dioxepane, and optionally carbon monoxide are reacted in the presence of free radical catalyst to form a biodegradable and optionally photodegradable polymer represented by the formulae: ##STR1## where x and y are integers or ##STR2## where x, y and z are integers.
    Type: Grant
    Filed: October 22, 1991
    Date of Patent: January 25, 1994
    Assignee: Exxon Chemical Patents Inc.
    Inventor: Richard G. Austin
  • Patent number: 5281368
    Abstract: The present invention relates to a novel compound, its use as an initiator in anionic polymerizations yielding norbornene-terminated homopolymers of block copolymers, and the further use of said norbornene-terminated polymers as macromonomers in the preparation of graft copolymers.
    Type: Grant
    Filed: March 31, 1992
    Date of Patent: January 25, 1994
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Anthony J. Dias, Sudhin Datta, Joseph A. Olkusz, Fred T. Morrar
  • Patent number: 5278119
    Abstract: The present invention relates to catalysts, to a method for preparing such catalysts, to a method of using such catalysts and to polymeric products produced with such catalysts. The catalysts are particularly useful in the polymerization of - olefins, diolefins and acetylenically unsaturated monomers. The improved catalysts are prepared by combining at least one first compound which is a bis(cyclopentadienyl) derivative of a metal of Group IV-B of the Periodic Table of the Elements capable of forming a cation formally having a coordination number of 3 and a valence of +4 and at least one second compound comprising a cation capable of donating a proton and a compatible noncoordinating anion comprising a plurality of boron atoms, which anion is both bulky and labile, and capable of stabilizing the Group IV-B metal cation without interfering with said Group IV-B metal cation's or its decomposition product's ability to polymerize .alpha.-olefin, diolefins and/or acetylically unsaturated monomers.
    Type: Grant
    Filed: April 28, 1992
    Date of Patent: January 11, 1994
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Howard W. Turner, Gregory G. Hlatky
  • Patent number: 5272003
    Abstract: Syndiotactic polypropylene fibers from syndiotactic polypropylene having a melting point of from 100.degree. C. to 160.degree. C. and desirably a polymer having blocks of repeating racemic dyads connected predominantly by units having a meso triad or a meso dyad and methods of making such fibers. Fabrics, yarns and tows made from these fibers are useful in the production of diapers, hospital gowns, and the like.
    Type: Grant
    Filed: December 18, 1992
    Date of Patent: December 21, 1993
    Assignee: Exxon Chemical Patents Inc.
    Inventor: Andrew J. Peacock
  • Patent number: 5266392
    Abstract: Compatibilized blends of polypropylene, linear low density polyethylene and a low molecular weight plastomer are disclosed. The blend preferably contains at least about 50 percent by weight of crystalline polypropylene, from about 10 to about 50 percent by weight of LLDPE dispersed in a matrix of the polypropylene, and a compatibilizing amount of an ethylene/alpha-olefin plastomer having a weight average molecular weight between about 5,000 to about 50,000, a density of less than about 0.90 g/cm.sup.3, and a melt index of at least about 50 dg/min. The blend is useful in the formation of melt spun and melt blown fibers. Also disclosed are spun bonded-melt blown-spun bonded fabrics made from the blends.
    Type: Grant
    Filed: November 16, 1992
    Date of Patent: November 30, 1993
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Louis P. Land, Angelo A. Montagna, Kenneth W. Bartz, Aspy K. Mehta
  • Patent number: 5246783
    Abstract: Disclosed are electrically conductive and semiconductive devices utilizing polymers having resistance to water treeing and good dielectric properties. The polymer comprises ethylene polymerized with at least one C.sub.3 to C.sub.20 alpha-olefin and optionally at least one C.sub.3 to C.sub.20 polyene. The polymer utilized has a density in the range of about 0.86 g/cm.sup.3 to about 0.96 g/cm.sup.3, a melt index in the range of about 0.2 dg/min to about 100 dg/min, a molecular weight distribution in the range of about 1.5 to about 30, and a composition distribution breadth index greater than about 45 percent. For the polymer utilized, the tree rating is generally less than about 40, the power factor is in the range of about 0.0002 to about 0.0005, and the dielectric constant is in the range of about 1.8 to about 2.4.
    Type: Grant
    Filed: August 15, 1991
    Date of Patent: September 21, 1993
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Lawrence Spenadel, Monica L. Hendewerk, Aspy K. Mehta
  • Patent number: 5242754
    Abstract: Acrylic copolymer compositions which contain a tackifying hydrocarbon resin and a polyfunctional crosslinking monomer and the use of such composition in pressure-sensitive adhesives are described. The tackifying hydrocarbon resin is dissolved, as is the polyfunctional monomer, in a solution of alkyl(meth)acrylate and (meth) acrylic acid monomers and is present during the polymerization of the monomers to form a tackified acrylic copolymer.
    Type: Grant
    Filed: November 6, 1992
    Date of Patent: September 7, 1993
    Assignee: Exxon Chemical Patents Inc.
    Inventor: Henry W.-H. Yang
  • Patent number: 5241025
    Abstract: This invention relates to catalyst systems, and a method for using such system, for the enhanced production of homo and copolymer products of olefin, diolefin and/or acetylenically unsaturated monomers. This invention catalyst system comprises a Group III-A element compound for improving the productivity of an olefin polymerization catalyst which is the reaction product of a metallocene of a Group IV-B transition metal and an ionic activator compound comprising a cation capable of donating a proton which will irreversibly react with at least one ligand contained in the Group IV-B metal compound and an anion which is bulky, labile and noncoordinateable with the Group IV transition metal cation produced upon reaction of the metallocene and activator compound to form the catalyst component of the catalyst system.
    Type: Grant
    Filed: October 2, 1992
    Date of Patent: August 31, 1993
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Gregory G. Hlatky, Howard W. Turner