Patents by Inventor Adel F. Halasa

Adel F. Halasa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5629256
    Abstract: The subject invention relates to an anionic polymerization technique for synthesizing rubbery polymers of conjugated diolefin monomers, such as rubbery copolymer of .alpha.-methylstyrene and 1,3-butadiene. These rubbery copolymers exhibit an excellent combination of properties for utilization in tire tread rubber compounds. They have high trans-isomer contents which leads to good treadwear characteristics and a broad molecular weight distribution which enhances processability.
    Type: Grant
    Filed: July 29, 1996
    Date of Patent: May 13, 1997
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Adel F. Halasa, Laurie E. Austin, Susan A. Weakland
  • Patent number: 5627237
    Abstract: This invention reveals a pneumatic tire having an outer circumferential tread wherein said tread is a sulfur-cured rubber composition comprised of, based on 100 parts by weight of rubber, (1) from about 5 to about 50 parts of 3,4-polyisoprene rubber, wherein said 3,4-polyisoprene rubber has (a) a 3,4-isomer content of from 75 percent to 95 percent, (b) a 1,2-isomer content of from 5 percent to 25 percent, (c) a glass transition temperature from 0.degree. to 25.degree. C. and (d) a number average molecular weight which is within the range of 30,000 to 180,000; and (2) from about 50 to about 95 parts of a rubbery polymer which is co-curable with the 3,4-polyisoprene rubber.
    Type: Grant
    Filed: May 6, 1996
    Date of Patent: May 6, 1997
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Adel F. Halasa, Wen-Liang Hsu, David J. Zanzig, Gerald L. Allen, Laurie E. Austin
  • Patent number: 5623035
    Abstract: The subject invention relates to an anionic polymerization technique for synthesizing rubbery polymers of conjugated diolefin monomers, such as a rubbery copolymer of .alpha.-methylstyrene and 1,3-butadiene. These rubbery copolymers exhibit an excellent combination of properties for utilization in tire tread rubber compounds. They have high trans-isomer contents which leads to good treadwear characteristics and a broad molecular weight distribution which enhances processability.
    Type: Grant
    Filed: July 21, 1995
    Date of Patent: April 22, 1997
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Adel F. Halasa, Laurie E. Austin, Susan A. Weakland
  • Patent number: 5620939
    Abstract: This invention reveals an initiator system which is comprised of (a) a lithium initiator, (b) a sodium alkoxide, and (c) a polar modifier; wherein the molar ratio of the sodium alkoxide to the polar modifier is within the range of about 0.1:1 to about 10:1; and wherein the molar ratio of the sodium alkoxide to the lithium initiator is within the range of about 0.01:1 to about 20:1.
    Type: Grant
    Filed: April 1, 1996
    Date of Patent: April 15, 1997
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Adel F. Halasa, Wen-Liang Hsu, David J. Zanzig, Paul H. Sandstrom, Steven K. Henning, Danielle Lucas
  • Patent number: 5616653
    Abstract: The subject invention discloses a process for preparing a coupled styrene-isoprene-butadiene rubber which is particularly valuable for use in making automobile tire tread rubber compounds which comprises the steps of (1) solution terpolymerizing in an organic solvent from about 5 weight percent to about 40 weight percent styrene, from about 1 weight percent to about 10 weight percent isoprene, and from about 50 weight percent to about 94 weight percent 1,3-butadiene, based on total monomers, to a conversion of at least about 90% to produce a living styrene-isoprene-butadiene polymer, wherein the terpolymerization is initiated with an organolithium compound, and wherein the terpolymerization is conducted in the presence of a polar modifier at a molar ratio of the polar modifier to the organolithium compound, which is within the range of about 0.5:1 to about 5:1, and wherein the terpolymerization is conducted at a temperature which is within the range of about 20.degree. C. to about 150.degree. C.
    Type: Grant
    Filed: July 29, 1996
    Date of Patent: April 1, 1997
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Wen-Liang Hsu, Adel F. Halasa, Barry A. Matrana, Scott M. Christian, Laurie E. Austin, Bill B. Gross
  • Patent number: 5612436
    Abstract: The subject invention discloses an isoprene-butadiene diblock rubber which is particularly valuable for use in making treads for tires which have improved wear characteristics without compromising traction characteristics or rolling resistance. Said isoprene-butadiene diblock rubber is comprised of (1) a first block which is comprised of repeat units which are derived from 1,3-butadiene and (2) a second block which is comprised of repeat units which are derived from both 1,3-butadiene and isoprene, wherein the repeat units derived from isoprene and 1,3-butadiene in the second block are in an essentially random order, wherein the diblock rubber has a glass transition temperature which is within the range of about -100.degree. C. to about -70.degree. C., and wherein the diblock rubber has a Mooney viscosity which is within the range of about 50 to about 140.
    Type: Grant
    Filed: September 8, 1995
    Date of Patent: March 18, 1997
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Adel F. Halasa, Wen-Liang Hsu, David J. Zanzig, Paul H. Sandstrom, Laurie E. Austin
  • Patent number: 5595951
    Abstract: The subject invention discloses a process for preparing an initiator which contains a plurality of lithium atoms and which is particularly useful for initiating the polymerization of diolefin monomers into rubbery polymers; said process being comprised of reacting an alkyl lithium compound with an unsaturated hydrocarbon containing allylic, benzylic or aryl hydrogen atoms, wherein said process is conducted in the presence of a member selected from the group consisting of alkali metal alkoxides, alkali metal phenoxides, and chelating tertiary alkyl 1,2-ethylene diamines. After the initiators of this invention have been prepared they can be employed to initiate the polymerization of diolefin monomers into rubbery polymers. They can, of course, also be employed to initiate the copolymerization of diolefin monomers and vinyl aromatic monomers into rubbery polymers. These rubbery polymers can then be used in making tire tread compounds for automobiles and trucks.
    Type: Grant
    Filed: March 16, 1995
    Date of Patent: January 21, 1997
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Adel F. Halasa, George Jalics
  • Patent number: 5552490
    Abstract: The subject invention relates to a technique for synthesizing rubbery copolymers of styrene and isoprene. These rubbery copolymers exhibit an excellent combination of properties for utilization in tire tread rubber compounds. By utilizing these styrene-isoprene rubbers in tire treads, tires having improved wet skid resistance can be built without sacrificing rolling resistance or tread wear characteristics.
    Type: Grant
    Filed: May 12, 1995
    Date of Patent: September 3, 1996
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: David J. Zanzig, Paul H. Sandstrom, Joseph K. Hubbell, Wen-Liang Hsu, Adel F. Halasa, John J. A. Verthe
  • Patent number: 5541264
    Abstract: The subject invention discloses a process for preparing a coupled styrene-isoprene-butadiene rubber which is particularly valuable for use in making automobile tire tread rubber compounds which comprises the steps of (1) solution terpolymerizing in an organic solvent from about 5 weight percent to about 40 weight percent styrene, from about 1 weight percent to about 10 weight percent isoprene, and from about 50 weight percent to about 94 weight percent 1,3-butadiene, based on total monomers, to a conversion of at least about 90% to produce a living styrene-isoprene-butadiene polymer, wherein the terpolymerization is initiated with an organolithium compound, and wherein the terpolymerization is conducted in the presence of a polar modifier at a molar ratio of the polar modifier to the organolithium compound, which is within the range of about 0.5:1 to about 5:1, and wherein the terpolymerization is conducted at a temperature which is within the range of about 20.degree. C. to about 150.degree. C.
    Type: Grant
    Filed: May 12, 1995
    Date of Patent: July 30, 1996
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Wen-Liang Hsu, Adel F. Halasa, Barry A. Matrana, Scott M. Christian, Laurie E. Austin, Bill B. Gross
  • Patent number: 5534592
    Abstract: This invention reveals a high performance polybutadiene rubber blend comprised of (a) a first polybutadiene rubber, (b) a second polybutadiene rubber, and (c) a third polybutadiene rubber; wherein the first polybutadiene rubber, the second polybutadiene rubber, and the third polybutadiene rubber are selected from the group of consisting of super-high vinyl polybutadiene rubbers having a vinyl content which is within the range of 80 percent to 100 percent, high vinyl polybutadiene rubbers having a vinyl content which is within the range of 60 percent to 79 percent, medium vinyl polybutadiene rubbers having a vinyl content which is within the range of 35 percent to 59 percent, and low vinyl polybutadiene rubbers having a vinyl content which is within the range of 8 percent to 34 percent; wherein at least three members selected from the group consisting of super-high vinyl polybutadiene rubbers, high vinyl polybutadiene rubbers, medium vinyl polybutadiene rubbers, and low vinyl polybutadiene rubbers are included
    Type: Grant
    Filed: September 22, 1995
    Date of Patent: July 9, 1996
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Adel F. Halasa, Wen-Liang Hsu, David J. Zanzig, Paul H. Sandstrom, Steven K. Henning, Danielle Lucas
  • Patent number: 5514757
    Abstract: The subject invention discloses a process for preparing a coupled styrene-isoprene-butadiene rubber which is particularly valuable for use in making automobile tire tread rubber compounds which comprises the steps of (1) solution terpolymerizing in an organic solvent from about 5 weight percent to about 40 weight percent styrene, from about 1 weight percent to about 10 weight percent isoprene, and from about 50 weight percent to about 94 weight percent 1,3-butadiene, based on total monomers, to a conversion of at least about 90% to produce a living styrene-isoprene-butadiene polymer, wherein the terpolymerization is initiated with an organolithium compound, and wherein the terpolymerization is conducted in the presence of a polar modifier at a molar ratio of the polar modifier to the organolithium compound, which is within the range of about 0.5:1 to about 5:1, and wherein the terpolymerization is conducted at a temperature which is within the range of about 20.degree. C. to about 150.degree. C.
    Type: Grant
    Filed: May 15, 1995
    Date of Patent: May 7, 1996
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Wen-Liang Hsu, Adel F. Halasa, Barry A. Matrana, Scott M. Christian, Laurie E. Austin, Bill B. Gross
  • Patent number: 5514756
    Abstract: The subject invention discloses a process for preparing a coupled styrene-isoprene-butadiene rubber which is particularly valuable for use in making automobile tire tread rubber compounds which comprises the steps of (1) solution terpolymerizing in an organic solvent from about 5 weight percent to about 40 weight percent styrene, from about 1 weight percent to about 10 weight percent isoprene, and from about 50 weight percent to about 94 weight percent 1,3-butadiene, based on total monomers, to a conversion of at least about 90% to produce a living styrene-isoprene-butadiene polymer, wherein the terpolymerization is initiated with an organolithium compound, and wherein the terpolymerization is conducted in the presence of a polar modifier at a molar ratio of the polar modifier to the organolithium compound, which is within the range of about 0.5:1 to about 5:1, and wherein the terpolymerization is conducted at a temperature which is within the range of about 20.degree. C. to about 150.degree. C.
    Type: Grant
    Filed: May 12, 1995
    Date of Patent: May 7, 1996
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Wen-Liang Hsu, Adel F. Halasa, Barry A. Matrana, Scott M. Christian, Laurie E. Austin, Bill B. Gross
  • Patent number: 5502126
    Abstract: The subject invention relates to a technique for synthesizing rubbery non-tapered, random, copolymers of 1,3-butadiene and isoprene. These rubbery copolymers exhibit an excellent combination of properties for utilization in tire sidewall rubber compounds for truck tires. By utilizing these isoprene-butadiene rubbers in tire sidewalls, tires having improved cut growth resistance can be built without sacrificing rolling resistance. Such rubbers can also be employed in tire tread compounds to improve tread wear characteristics and decrease rolling resistance without sacrificing traction characteristics.
    Type: Grant
    Filed: October 28, 1994
    Date of Patent: March 26, 1996
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Anthony J. Bell, Barry A. Matrana, Adel F. Halasa
  • Patent number: 5491196
    Abstract: The present invention relates to a tire innerliner and pneumatic tires containing the same, which are prepared from a composition comprising, based on 100 parts by weight of rubber, a blend containing 30 to about 50 parts by weight of a solution polymerized styrene-butadiene rubber having a Tg ranging from -45.degree. C. to -65.degree. C. and 70 to 50 parts by weight of a halobutyl rubber.
    Type: Grant
    Filed: February 24, 1995
    Date of Patent: February 13, 1996
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Roger N. Beers, David A. Benko, Bill B. Gross, Adel F. Halasa
  • Patent number: 5470929
    Abstract: The subject invention relates to a technique for synthesizing rubbery copolymers of styrene and isoprene. These rubbery copolymers exhibit an excellent combination of properties for utilization in tire tread rubber compounds. By utilizing these styrene-isoprene rubbers in tire treads, tires having improved wet skid resistance can be built without sacrificing rolling resistance or tread wear characteristics.
    Type: Grant
    Filed: September 6, 1994
    Date of Patent: November 28, 1995
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: David J. Zanzig, Paul H. Sandstrom, Joseph K. Hubbell, Wen-Liang Hsu, Adel F. Halasa, John J. A. Verthe
  • Patent number: 5448003
    Abstract: It has been unexpectedly discovered that various compounds, such as alkyl tetrahydrofurfuryl ethers, can be used to modify anionic polymerizations of conjugated diene monomers. These modifiers can be used to polymerize isoprene monomer into high 3,4-polyisoprene at excellent polymerization rates. This is in contrast to the modifiers such as tetramethylethylene diamine which are typically used to modify such polymerizations. This invention more specifically discloses a process for the synthesis of 3,4-polyisoprene which comprises polymerizing isoprene monomer in an organic solvent in the presence of a catalyst system which is comprised of (a) a lithium initiator and (b) an alkyltetrahydrofurfuryl ether modifier, wherein the alkyl group in the alkyltetrahydrofurfuryl ether modifier contains from 6 to about 10 carbon atoms.
    Type: Grant
    Filed: August 8, 1994
    Date of Patent: September 5, 1995
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Wen-Liang Hsu, Adel F. Halasa, Barry A. Matrana
  • Patent number: 5422403
    Abstract: The subject invention discloses a process for preparing a coupled styrene-isoprene-butadiene rubber which is particularly valuable for use in making automobile tire tread rubber compounds which comprises the steps of (1) solution terpolymerizing in an organic solvent from about 5 weight percent to about 40 weight percent styrene, from about 1 weight percent to about 10 weight percent isoprene, and from about 50 weight percent to about 94 weight percent 1,3-butadiene, based on total monomers, to a conversion of at least about 90% to produce a living styrene-isoprene-butadiene polymer, wherein the terpolymerization is initiated with an organolithium compound, and wherein the terpolymerization is conducted in the presence of a polar modifier at a molar ratio of the polar modifier to the organolithium compound, which is within the range of about 0.5:1 to about 5:1, and wherein the terpolymerization is conducted at a temperature which is within the range of about 20.degree. C. to about 150.degree. C.
    Type: Grant
    Filed: August 11, 1994
    Date of Patent: June 6, 1995
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Wen-Liang Hsu, Adel F. Halasa, Barry A. Matrana, Scott M. Christian, Laurie E. Austin, Bill B. Gross
  • Patent number: 5405815
    Abstract: The subject invention relates to a technique for synthesizing rubbery non-tapered, random, copolymers of 1,3-butadiene and isoprene. These rubbery copolymers exhibit an excellent combination of properties for utilization in tire sidewall rubber compounds for truck tires. By utilizing these isoprene-butadiene rubbers in tire sidewalls, tires having improved cut growth resistance can be built without sacrificing rolling resistance. Such rubbers can also be employed in tire tread compounds to improve tread wear characteristics and decrease rolling resistance without sacrificing traction characteristics.
    Type: Grant
    Filed: June 17, 1993
    Date of Patent: April 11, 1995
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Anthony J. Bell, Barry A. Matrana, Adel F. Halasa
  • Patent number: 5405927
    Abstract: The subject invention discloses an isoprenebutadiene rubber which is particularly valuable for use in making truck tire treads, said rubber being comprised of repeat units which are derived from about 20 weight percent to about 50 weight percent isoprene and from about 50 weight percent to about 80 weight percent 1,3-butadiene, wherein the repeat units derived from isoprene and 1,3-butadiene are in essentially random order, wherein from about 3% to about 10% of the repeat units in said rubber are 1,2-polybutadiene units, wherein from about 50% to about 70% of the repeat units in said rubber are 1,4-polybutadiene units, wherein from about 1% to about 4% of the repeat units in said rubber are 3,4-polyisoprene units, wherein from about 25% to about 40% of the repeat units in the polymer are 1,4-polyisoprene units, wherein the rubber has a glass transition temperature which is within the range of about -90.degree. C. to about -75.degree. C.
    Type: Grant
    Filed: September 22, 1993
    Date of Patent: April 11, 1995
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Wen-Liang Hsu, Barry A. Matrana, Adel F. Halasa, Michael B. Rodgers, Jennifer L. Gabor
  • Patent number: 5359016
    Abstract: The subject invention relates to a technique for synthesizing rubbery copolymers of styrene and isoprene. These rubbery copolymers exhibit an excellent combination of properties for utilization in tire tread rubber compounds. By utilizing these styrene-isoprene rubbers in tire treads, tires having improved wet skid resistance can be built without sacrificing rolling resistance or tread wear characteristics. This invention more specifically discloses a process for the synthesis of styrene-isoprene rubbers which comprises copolymerizing isoprene monomer and styrene monomer in an organic solvent in the presence of a catalyst system which is comprised of (a) a lithium initiator and (b) an alkyl tetrahydrofurfuryl ether modifier, wherein the molar ratio of the modifier to the lithitium initiator is within the range of 2:1 to 40:1.
    Type: Grant
    Filed: March 29, 1993
    Date of Patent: October 25, 1994
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Wen-Liang Hsu, Adel F. Halasa, Barry A. Matrana