Patents by Inventor Murali K. Akkapeddi

Murali K. Akkapeddi 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: 5621040
    Abstract: This invention relates to a blend of a polyester, an amine functionalized elastomer and agraft coupling agent.
    Type: Grant
    Filed: August 11, 1995
    Date of Patent: April 15, 1997
    Assignee: AlliedSignal Inc.
    Inventors: Murali K. Akkapeddi, Bruce VanBuskirk
  • Patent number: 5552463
    Abstract: A miscible blend composition having high T.sub.g and good chemical resistance comprising, based on the total weight of the composition, from about 30 to about 90 weight % of a polyalkylene terephthalate, from about 70 to about 10 weight % of a polyarylate polymer, and an effective amount of an ester-interchange inhibitor.
    Type: Grant
    Filed: May 26, 1995
    Date of Patent: September 3, 1996
    Assignee: AlliedSignal Inc.
    Inventors: Murali K. Akkapeddi, Seng-Shiu Chung
  • Patent number: 5541267
    Abstract: A polyamide composition comprising an aliphatic polyamide such as nylon 6 and an oligomeric aromatic polyamide, such as oligomers of poly(tolylene diisophthalamide), which exhibit improved retention flexural modulus and flexural strength at ambient humidity, i.e. about 50% to about 65%.
    Type: Grant
    Filed: November 28, 1994
    Date of Patent: July 30, 1996
    Assignee: AlliedSignal Inc.
    Inventors: Murali K. Akkapeddi, Jeffrey H. Glans, Gerald J. Dege, Sengshiu J. Chung
  • Patent number: 5504158
    Abstract: There is provided in accordance with the present invention polyphenylene ether/polyalkyleneterephthalamide compositions of high dimensional stabilities that are suitable for high temeprature applications comprising from about 20 to about 70 weight % of a functionalized polyphenylene ether; from about 20 to about 70 weight % of a polyalkyleneterephthalamide, wherein the polyalkyleneterephthalamide is derived from terephthalic acid and an .alpha.,.omega.-alkanediamine having 10 to 14 methylene groups; and from about 0 to about 20 weight % of a functionalized elastomeric polymer, wherein the blend absorbs less than 2 wt % of moisture and has a dimensional growth in water of less than 0.5%.
    Type: Grant
    Filed: January 10, 1995
    Date of Patent: April 2, 1996
    Assignee: AlliedSignal Inc.
    Inventors: Murali K. Akkapeddi, Jeffrey H. Glans
  • Patent number: 5436296
    Abstract: Compositions comprising polyalkylene terephthalate, polyethylene and a compatibilizer copolymer of a C.sub.2 -C.sub.10 alpha-olefin and a glycidyl or isocyanate group-containing functional compound, wherein the functional compound comprises about 0.4 to about 50 weight percent of the compatibilizer copolymer, provide improved impact properties and heat resistance. The compositions feature improved compatibility of polyalkylene terephthalate and polyethylene, and are useful in forming a wide variety of articles therefrom.
    Type: Grant
    Filed: March 31, 1994
    Date of Patent: July 25, 1995
    Assignee: AlliedSignal Inc.
    Inventors: A. Xavier Swamikannu, Murali K. Akkapeddi
  • Patent number: 5391640
    Abstract: Thermoplastic polymeric composition which feature good physical properties which are relatively insensitive to humidity and further exhibits good barrier properties of the composition comprise:(A) a first conventional polyamide, and(B) an amorphous copolyamide which is polymerized from(B.sub.1) a polyamide forming monomer selected from the group consisting of lactams, aminoalkanoic acids and mixture thereof wherein the monomer is present in a molar proportion of between about 0 and 50%,(B.sub.2) a diamine selected from the group consisting of aralkylene diamines, cycloalkylene diamines and mixtures thereof, the diamine being present in a molar proportion of between about 25 and 60%,(B.sub.
    Type: Grant
    Filed: December 17, 1993
    Date of Patent: February 21, 1995
    Assignee: AlliedSignal Inc.
    Inventors: Murali K. Akkapeddi, Jeffrey H. Glans, Jerome F. Parmer
  • Patent number: 5389710
    Abstract: This invention relates to an improved polyester composition that has a wide temperature range of crystallization. The composition comprises a polyester and a chemically reacting crystallization modifier having the following formula:H.sub.2 N--R.sup.1 --O--(R.sup.2 --O).sub.x --R.sup.3 --NH.sub.2whereinR.sup.1 and R.sup.3 are independently selected from the group consisting of alkylene units having from about 2 to about 6 carbon atoms;R.sup.2 is a hydrocarbon radical of 2-6 carbon atoms; andx is from 1 to 100.
    Type: Grant
    Filed: November 23, 1992
    Date of Patent: February 14, 1995
    Inventors: Gerald J. Dege, Murali K. Akkapeddi, Harold W. Tuller, Nicholas Vanderkooi, Jr.
  • Patent number: 5357030
    Abstract: The invention relates to a process for producing chain extended polyamide compositions which comprise one or more polyamides and one or more lactamyl phosphites.
    Type: Grant
    Filed: June 3, 1992
    Date of Patent: October 18, 1994
    Assignee: AlliedSignal Inc.
    Inventors: Bruce VanBuskirk, Murali K. Akkapeddi, Jeffrey H. Glans
  • Patent number: 5283285
    Abstract: This invention relates to a blend comprising a polyester, polycarbonate and an amine functinalized elastomer and optionally an effective amount of an effective graft coupling agent.
    Type: Grant
    Filed: April 5, 1993
    Date of Patent: February 1, 1994
    Assignee: AlliedSignal Inc.
    Inventors: Murali K. Akkapeddi, Bruce VanBuskirk
  • Patent number: 5281676
    Abstract: Processes for producing and polyester compositions of intermediate and high molecular weights are attained by reacting with at least one lower molecular weight polyester with an effective amount of a lactamyl phosphite as a constituent. The reaction may be carried out by blending these constituents and any other optional constituents and is preferably formed by melt blending.
    Type: Grant
    Filed: June 3, 1992
    Date of Patent: January 25, 1994
    Assignee: AlliedSignal Inc.
    Inventors: Bruce VanBuskirk, Murali K. Akkapeddi, Jeffrey H. Glans
  • Patent number: 5276131
    Abstract: This invention relates to cyclic diamides that are readily polymerized to form poly(terephthalamides). The resulting poly(terephthalamides) have high crystallinity, high temperature capabilities, dimensional stability, low moisture sensitivity, and solvent and chemical resistance.
    Type: Grant
    Filed: June 11, 1992
    Date of Patent: January 4, 1994
    Assignee: Allied Signal Inc.
    Inventors: Murali K. Akkapeddi, Jeffrey H. Glans
  • Patent number: 5210134
    Abstract: A modified styrenic polymer is described, which comprises the reaction product of said polymer with an ethylenically unsaturated grafting agent having the formula: ##STR1## wherein one to three of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are moieties containing reactive groups selected from carboxylic acid, acid anhydride, acid amide, imido, carboxylic ester, amino, hydroxyl, epoxy, isocyanate, carbamate, carbamoyl lactam, acyl lactam, pyridyl, 1,3-oxazoline, 1,3 oxazine, oxazolone, oxazinones, and any derivatives, combinations and mixtures thereof; andwherein the remaining one to three of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are H or a hydrocarbon radical of from about 1 to about 20 carbon atoms; said modified styrenic polymer containing said reactive groups as pendant reactive functionalities.The claimed composition comprises:A) maleated ABSB) polyesterC) optionally ethylene copolymer rubber.
    Type: Grant
    Filed: February 12, 1992
    Date of Patent: May 11, 1993
    Assignee: Allied Signal
    Inventors: Murali K. Akkapeddi, Bruce VanBuskirk, Timothy J. Kraft
  • Patent number: 5191060
    Abstract: A process of preparing homopolymers and copolymers of dodecane terephthalamide having a high melting temperature and dimensional stability, comprising the steps of forming an aqueous suspension of a prepolymer comprising substantially equimolar diacid/diamine admixture of 1,12-dodecanediamine, terephthalic acid, and optionally at least one additonal comonomer in a reactor at a reaction temperature below the melting temperature of the resulting polyamide polymer; drying the prepolymer; and polycondensating the dried prepolymer in an extruder, particularly a vented single screw extruder, to form the polyamide polymer.
    Type: Grant
    Filed: January 8, 1992
    Date of Patent: March 2, 1993
    Assignee: Allied Signal
    Inventors: Murali K. Akkapeddi, Michael F. Cummings, Gerald J. Dege
  • Patent number: 5162440
    Abstract: The present invention relates to a melt blended composition of the reaction product of about 70 to 99.99 percent by weight polyphenylene oxide, and about 0.01 to 30 percent by weight of a substituted olefin having the formula: ##STR1## wherein one to two of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are moieties containing reactive groups selected from carboxylic acid, acid anhydride, acid amide, imido, carboxylic ester, amino, hydroxyl, epoxy, group, oxazoline, oxazolone, oxazine, oxazinone, isocyanate, carbamate, carbamoyl lactam, acyl lactam, and mixtures and derivatives thereof, and wherein the remaining two to three of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are H or a hydrocarbon radical of from 1 to about 20 carbon atoms; and polyolefin.The present invention also relates to a blended composition of the foregoing reaction product; thermoplastic polymer; and a functionalized ethylene .alpha.-olefin rubber. The melt blended composition has good impact resistance.
    Type: Grant
    Filed: January 29, 1990
    Date of Patent: November 10, 1992
    Assignee: Allied-Signal Inc.
    Inventors: Murali K. Akkapeddi, Bruce VanBuskirk, Alan C. Brown
  • Patent number: 5118805
    Abstract: Novel compositions of phosphoroustriscaprolactams, including tris(caprolactyl)phosphite which may be produced in accordance with the methods disclosed, finding particular utility as catalysts for esterification and other condensation reactions.
    Type: Grant
    Filed: April 22, 1991
    Date of Patent: June 2, 1992
    Assignee: Allied-Signal Inc.
    Inventors: Jeffrey H. Glans, Murali K. Akkapeddi
  • Patent number: 5115018
    Abstract: A modified styrenic polymer is described, which comprises the reaction product of said polymer with an ethylenically unsaturated grafting agent having the formula: ##STR1## wherein one to three of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are moieties containing reactive groups selected from carboxylic acid, acid anhydride, acid amide, imido, carboxylic ester, amino, hydroxyl, epoxy, isocyanate, carbamate, carbamoyl lactam, acyl lactam, pyridyl, 1,3-oxazoline, 1,3 oxazine, oxazolone, oxazinones, and any derivatives, combinations and mixtures thereof;and wherein the remaining one to three of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are H or a hydrocarbon radical of from about 1 to about 20 carbon atoms; said modified styrenic polymer containing said reactive groups as pendant reactive functionalities.The claimed composition comprises:(A) a preblend of maleated ABS and a rubber(B) a polyester.
    Type: Grant
    Filed: September 25, 1990
    Date of Patent: May 19, 1992
    Assignee: Allied-Signal Inc.
    Inventors: Murali K. Akkapeddi, Bruce VanBuskirk, Timothy J. Kraft
  • Patent number: 5079339
    Abstract: The present invention is an improved polyamide copolymer having monomer units including repeat units of the formula ##STR1## where n is from 10 to 14 and preferably is 12 (1,12-dodecanediamine), units derived from a symmetrical diacid or derivatives of said diacid, preferably a symmetrical aromatic dicarboxylic acid. The copolymer has minor amounts, preferably 3 to 30 and more preferably 5 to 10 mol percent, of units derived from an additional comonomer.
    Type: Grant
    Filed: August 13, 1990
    Date of Patent: January 7, 1992
    Assignee: Allied-Signal Inc.
    Inventors: Murali K. Akkapeddi, Jeffrey H. Glans
  • Patent number: 5070152
    Abstract: The invention relates to improved polymer material blends which include the compatibilizing agent, a compound of phosphoroustrislactams which is useful as a compatibilizing agent, between the polymer materials. An exemplary composition comprises one or more polyphenylene oxides, one or more polyesters and the compatibilizing agent comprising phosphoroustrislactams.
    Type: Grant
    Filed: March 28, 1991
    Date of Patent: December 3, 1991
    Assignee: Allied-Signal Inc.
    Inventors: Jeffrey H. Glans, Murali K. Akkapeddi
  • Patent number: 5037897
    Abstract: The invention relates to improved polymer material blends which include the compatibilizing agent, a compound of phosphoroustrislactams which is useful as a compatibilizing agent, between the polymer materials. An exemplary composition comprises one or more polyphenylene oxides, one or more polyesters and the compatibilizing agent comprising phosphoroustrislactams.
    Type: Grant
    Filed: August 3, 1990
    Date of Patent: August 6, 1991
    Assignee: Allied-Signal Inc.
    Inventors: Jeffrey H. Glans, Murali K. Akkapeddi
  • Patent number: 4902749
    Abstract: A modified styrenic polymer is described, which comprises the reaction product of said polymer with an ethylenically unsaturated grafting agent having the formula: ##STR1## wherein one to three of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are moieties containing reactive groups selected from carboxylic acid, acid anhydride, acid amide, imido, carboxylic ester, amino, hydroxy, epoxy, isocyanate, carbamate, carbamoyl lactam, acyl lactam, pyridyl, 1,3-oxazoline, 1,3 oxazine, oxazolone, oxazinones, and any derivatives, combinations and mixtures thereof;and wherein the remaining one to three of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are H or a hydrocarbon radical of from about 1 to about 20 carbon atoms; said modified styrenic polymer containing said reactive groups as pendant reactive functionalities.The claimed composition comprises:(A) A preblend of maleated ABS and a functionalized EP rubber and(B) a polyamide with reactive end groups.
    Type: Grant
    Filed: October 19, 1988
    Date of Patent: February 20, 1990
    Assignee: Allied-Signal Inc.
    Inventors: Murali K. Akkapeddi, Bruce VanBuskirk, Timothy J. Kraft