Patents by Inventor Shreyas Chakravarti
Shreyas Chakravarti 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).
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Patent number: 10913851Abstract: Compositions formed from a blend of polyetherimide, siloxane/bisphenol-A polyester/polycarbonate copolymer, polycyclohexylenedimethylene terephthalate, polycarbonate/siloxane copolymer, and styrene-ethylene-butadiene-styrene are disclosed that provide superior performance in terms of notched Izod impact, glass transition temperature (Tg), strength after aging, ability to withstand secondary processing conditions, and in other respects. Such compositions exceed critical-to-quality requirements for use in manufacturing components for electronic communication devices.Type: GrantFiled: October 19, 2016Date of Patent: February 9, 2021Assignee: SHPP Global Technologies B.V.Inventors: Yuzhen Yang, Hao Zhou, Shreyas Chakravarti
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Patent number: 10696842Abstract: Compositions formed from a blend of polycarbonate/siloxane copolymer, polycarbonate, and polycyclohexylenedimethylene terephthalate are disclosed that provide superior performance in terms of notched Izod impact, glass transition temperature (Tg), strength after aging, ability to withstand secondary processing conditions, and in other respects. Such compositions exceed critical-to-quality requirements for use in manufacturing components for electronic communication devices.Type: GrantFiled: July 21, 2016Date of Patent: June 30, 2020Assignee: SABIC Global Technologies B.V.Inventors: Yuzhen Yang, Hao Zhou, Robert Russell Gallucci, Shreyas Chakravarti, Pooja Bajaj
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Publication number: 20190090799Abstract: Provided herein are test elements useful in medical applications, such as glucose testing strips. The test elements have improved mechanical properties and improved processing characteristics as compared to existing test elements.Type: ApplicationFiled: November 2, 2015Publication date: March 28, 2019Applicant: SABIC Global Technologies B.V.Inventors: Yuzhen XU, Hongtao SHI, Shreyas CHAKRAVARTI
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Publication number: 20180355173Abstract: Compositions formed from a blend of polyetherimide, siloxane/bisphenol-A polyester/polycarbonate copolymer, polycyclohexylenedimethylene terephthalate, polycarbonate/siloxane copolymer, and styrene-ethylene-butadiene-styrene are disclosed that provide superior performance in terms of notched Izod impact, glass transition temperature (Tg), strength after aging, ability to withstand secondary processing conditions, and in other respects. Such compositions exceed critical-to-quality requirements for use in manufacturing components for electronic communication devices.Type: ApplicationFiled: October 19, 2016Publication date: December 13, 2018Inventors: Yuzhen YANG, Hao ZHOU, Shreyas CHAKRAVARTI
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Publication number: 20180215916Abstract: Compositions formed from a blend of polycarbonate/siloxane copolymer, polycarbonate, and polycyclohexylenedimethylene terephthalate are disclosed that provide superior performance in terms of notched Izod impact, glass transition temperature (Tg), strength after aging, ability to withstand secondary processing conditions, and in other respects. Such compositions exceed critical-to-quality requirements for use in manufacturing components for electronic communication devices.Type: ApplicationFiled: July 21, 2016Publication date: August 2, 2018Applicant: SABIC Global Technologies B.V.Inventors: Yuzhen YANG, Hao ZHOU, Robert Russell GALLUCCI, Shreyas CHAKRAVARTI, Pooja BAJAJ
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Patent number: 8765029Abstract: The present invention provides methods for controlling the optical properties of a light transmissive article. The method includes identifying a target window in an Abbe diagram comprising reference polymeric materials. The method further includes selecting a first polymeric material from the reference polymeric materials and compounding the first polymeric material with a stable UV chromophore to provide a first polymer composition. The method further includes transforming the first polymer composition to provide the light transmissive article, wherein the light transmissive article has an Abbe number and a refractive index which falls within the target window. Light transmissive articles prepared using the above methods are also provided.Type: GrantFiled: December 5, 2006Date of Patent: July 1, 2014Assignee: Sabic Innovative Plastics IP B.V.Inventors: Eugene Pauling Boden, Brian Lee Lawrence, Steven James Montgomery, Shreyas Chakravarti, Peter Hendrikus Vollenberg, Edward Kung, Jan Henk Kamps, Lina Prada, John Brian McDermott, Michael Teruki Takemori
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Patent number: 8536272Abstract: Disclosed herein is a polymer composition comprising: a poly(arylene ether); a polyester; and an impact modifier. The composition has a continuous phase comprising polyester and a disperse phase comprising poly(arylene ether). The amount of the disperse phase is less than 35 weight percent, based on the total weight of the composition.Type: GrantFiled: July 12, 2007Date of Patent: September 17, 2013Assignee: Sabic Innovative Plastics IP B.V.Inventors: Pravin Borade, Donna Starrup Bossman, Shreyas Chakravarti, Robert R Gallucci, Roshan Kumar Jha, Ganesh Kannan, Nitin Moghe, Przemyslaw Olszynski
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Patent number: 8525191Abstract: An optoelectronic device assembly can include: a coated element and an optoelectronic device on the coated element. The coated element can include a thermoplastic substrate and a protective weathering layer. The thermoplastic substrate can include a bisphenol-A polycarbonate homopolymer and a polycarbonate copolymer, and wherein the polycarbonate copolymer is selected from a copolymer of tetrabromobisphenol A carbonate and BPA carbonate; a copolymer of 2-phenyl-3,3-bis(4-hydroxyphenyl)phthalimidine carbonate and BPA carbonate; a copolymer of 4,4?-(1-phenylethylidene) biphenol carbonate and BPA carbonate; a copolymer of 4,4?-(1-methylethylidene) bis[2,6-dimethyl-phenol]carbonate and BPA carbonate; and combinations comprising at least one of the foregoing. The protective weathering layer can include resorcinol polyarylate and polycarbonate.Type: GrantFiled: March 30, 2012Date of Patent: September 3, 2013Assignee: Sabic Innovative Plastics IP B.V.Inventors: Jian Zhou, James Edward Pickett, Shreyas Chakravarti
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Publication number: 20120248497Abstract: An optoelectronic device assembly can comprise: a coated element and an optoelectronic device on the coated element. The coated element can comprise a thermoplastic substrate and a protective weathering layer. The thermoplastic substrate can comprise a bisphenol-A polycarbonate homopolymer and a polycarbonate copolymer, and wherein the polycarbonate copolymer is selected from a copolymer of tetrabromobisphenol A carbonate and BPA carbonate; a copolymer of 2-phenyl-3,3-bis(4-hydroxyphenyl)phthalimidine carbonate and BPA carbonate; a copolymer of 4,4?-(1-phenylethylidene)biphenol carbonate and BPA carbonate; a copolymer of 4,4?-(1-methylethylidene)bis[2,6-dimethyl-phenol]carbonate and BPA carbonate; and combinations comprising at least one of the foregoing. The protective weathering layer can comprise resorcinol polyarylate and polycarbonate.Type: ApplicationFiled: March 30, 2012Publication date: October 4, 2012Applicant: SABIC INNOVATIVE PLASTICS IP B.V.Inventors: Jian Zhou, James Edward Pickett, Shreyas Chakravarti
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Patent number: 8222347Abstract: A composition of matter comprising a thermoplastic resin composition derived from (i) a polyester derived from a cycloaliphatic diol, and an aromatic diacid; (ii) a polycarbonate derived from at least from 20 mole percent to 100 mole percent of an aromatic diol derived from structure II wherein R3 and R4 are independently selected from the group consisting of C1-C30 aliphatic, C2-C30 cycloaliphatic and C2-C30 aromatic groups, X is CH2 and m is an integer from 3 to 7, n is an integer from 1 to 4, p is an integer from 1 to 4, and from 0 mole percent to 80 mole percent of a second aromatic dihydroxy compound; and wherein the resin composition is transparent is disclosed. Also disclosed is a process to prepare this composition and articles therefrom.Type: GrantFiled: July 25, 2007Date of Patent: July 17, 2012Assignee: Sabic Innovative Plastics IP B.V.Inventors: Shreyas Chakravarti, Songping Liao, Dake Shen, Huiping Zhang
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Polycarbonate-poly(ether-ester) copolymer composition, method of manufacture, and articles therefrom
Patent number: 8129471Abstract: A composition comprising: a polycarbonate comprising units derived from a bisphenol cyclohexylidene of the formula: wherein Rc1 and Rd1 are each independently C1-12 alkyl, Rc2 and Rd2 are each independently hydrogen or C1-12 alkyl, Rg is C1-12 alkyl or halogen, and t is 0 to 10; and a poly(ether-ester) copolymer comprising 40 to 60 wt % of polyester hard block units derived from a C6-C24 aromatic dicarboxylic acid or a C6-C24 alicyclic dicarboxylic acid and at least one glycol component, wherein when the C6-C24 aromatic dicarboxylic acid comprises terephthalic acid, isophthalic acid groups are present in an amount from 0 to 30 mole %, based on the total moles of isophthalic acid groups and terephthalic acid groups in the hard block units, and 40 to 60 wt % of polyether soft block units derived from poly(oxytetramethylene) glycol, wherein the molecular weight of the poly(oxytetramethylene) glycol groups is 300 to 1800 Daltons.Type: GrantFiled: December 30, 2009Date of Patent: March 6, 2012Assignee: Sabic Innovative Plastics IP B.V.Inventors: Shreyas Chakravarti, Christopher Luke Hein, Peter Hendrikus Theodorus Vollenberg -
Patent number: 8114952Abstract: A composition comprises a blend of 50 to 90 wt. % of a polycarbonate copolymer, 10 to 50 wt. % of a polyester wherein the weight percent of the polycarbonate copolymer and the polyester are each based on the total weight of the polycarbonate copolymer and the polyester. A molded sample of the composition having a thickness of 2.5 mm has a luminous transmittance of greater than 80% and a haze of less than 20% when measured in accordance with ASTM D 1003.Type: GrantFiled: August 29, 2008Date of Patent: February 14, 2012Assignee: Sabic Innovative Plastics IP B.V.Inventors: Nina P. Vaze, Tieb M. B. Aouraghe, Johannes Hubertus G. M. Lohmeijer, Shreyas Chakravarti
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Patent number: 8106126Abstract: A composition comprises a blend of 20 to 90 wt. % of a polycarbonate, 10 to 80 wt. % of a polyester wherein the weight percent of the polycarbonate and the polyester are each based on the total weight of the polycarbonate and the polyester. A sample of the composition having a thickness of 2.5 mm has a luminous transmittance of greater than or equal to 80% and a haze of less than 20% when measured in accordance with ASTM D 1003.Type: GrantFiled: August 29, 2008Date of Patent: January 31, 2012Assignee: Sabic Innovative Plastics IP B.V.Inventors: Nina P. Vaze, Tieb M. B. Aouraghe, Johannes Hubertus G. M. Lohmeijer, Shreyas Chakravarti
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Patent number: 8092717Abstract: Disclosed herein is a polymer composition comprising: a poly(arylene ether); a polyester; electrically conductive filler, and an impact modifier. The composition has a continuous phase comprising polyester and a disperse phase comprising poly(arylene ether). The amount of the disperse phase is less than 35 weight percent, based on the total weight of the composition.Type: GrantFiled: July 12, 2007Date of Patent: January 10, 2012Assignee: Sabic Innovative Plastics IP B.V.Inventors: Pravin Borade, Donna Starrup Bossman, Shreyas Chakravarti, Robert R Gallucci, Roshan Kumar Jha, Ganesh Kannan, Nitin Moghe, Przemyslaw Olszynski
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Publication number: 20110189449Abstract: In one embodiment, a sheet, comprises: a cap layer comprising an acrylic polymer; and a base layer, where the cap layer and the base layer were co-extruded to form the sheet, which is thermoformable. The base layer comprises a polycarbonate. The cap layer is 10% to 30% of an overall thickness and the overall thickness is 5 mil to 500 mil.Type: ApplicationFiled: April 11, 2011Publication date: August 4, 2011Applicant: SABIC Innovative Plastics IP B.V.Inventors: Sandeep Tripathi, Shreyas Chakravarti, Sapna Kirk Blackburn
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POLYCARBONATE-POLY(ETHER-ESTER) COPOLYMER COMPOSITION, METHOD OF MANUFACTURE, AND ARTICLES THEREFROM
Publication number: 20110155975Abstract: A composition comprising: a polycarbonate comprising units derived from a bisphenol cyclohexylidene of the formula: wherein Rc1 and Rd1 are each independently C1-12 alkyl, Rc2 and Rd2 are each independently hydrogen or C1-12 alkyl, Rg is C1-12 alkyl or halogen, and t is 0 to 10; and a poly(ether-ester) copolymer comprising 40 to 60 wt % of polyester hard block units derived from a C6-C24 aromatic dicarboxylic acid or a C6-C24 alicyclic dicarboxylic acid and at least one glycol component, wherein when the C6-C24 aromatic dicarboxylic acid comprises terephthalic acid, isophthalic acid groups are present in an amount from 0 to 30 mole %, based on the total moles of isophthalic acid groups and terephthalic acid groups in the hard block units, and 40 to 60 wt % of polyether soft block units derived from poly(oxytetramethylene) glycol, wherein the molecular weight of the poly(oxytetramethylene) glycol groups is 300 to 1800 Daltons.Type: ApplicationFiled: December 30, 2009Publication date: June 30, 2011Inventors: Shreyas Chakravarti, Christopher Luke Hein, Peter Hendrikus Theodorus Vollenberg -
Patent number: 7923100Abstract: In one embodiment, the sheet, comprises: a cap layer comprising an acrylic polymer; and a base layer, wherein the sheet is thermoformable. The base layer comprises a cycloaliphatic polyester copolymer and an optionally, an aromatic polycarbonate. The cycloaliphatic polyester copolymer can comprise greater than 10 wt % cycloaliphatic diol or acid or combination thereof, based upon a total weight of the cycloaliphatic polyester copolymer.Type: GrantFiled: January 28, 2008Date of Patent: April 12, 2011Assignee: Sabic Innovative Plastics IP B.V.Inventors: Sandeep Tripathi, Shreyas Chakravarti, Sapna Kirk Blackburn
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Patent number: 7829632Abstract: A composition comprises a polyester-polycarbonate polymer comprising isophthalate-terephthalate-resorcinol ester units and carbonate units, a poly(C4-alkylene) ester, and a polyester comprising cyclohexanedimethylene terephthalate units, or a combination of cyclohexanedimethylene terephthalate and ethylene terephthalate. The composition can be extruded into pellets that are clear and colorless. The composition can further be molded into articles having a percent haze value less than or equal to 10 percent, and total luminous transmittance value of greater than or equal to 70 percent, measured in accordance with ASTM D1003-00. Also disclosed is a method for forming the compositions, and articles prepared therefrom.Type: GrantFiled: April 30, 2007Date of Patent: November 9, 2010Assignee: Sabic Innovative Plastics IP B.V.Inventors: Shreyas Chakravarti, Bernardus Antonius Gerardus Schrauwen, Robert Dirk van de Grampel
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Publication number: 20100168314Abstract: Specific thermoplastic compositions containing a polyester or a blend of polyester and polycarbonate, an impact modifier and a block copolyestercarbonate are provided that remain ductile at or below freezing exhibiting an impact energy at or below 0° C. of greater than 25 kjoules/m2.Type: ApplicationFiled: December 29, 2008Publication date: July 1, 2010Applicant: SABIC INNOVATIVE PLASTICS IP B.V.Inventors: SHREYAS CHAKRAVARTI, BERNARDUS ANTONIUS GERARDUS SCHRAUWEN, ROBERT DIRK VAN DE GRAMPEL, SUNG DUG KIM
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Patent number: 7691304Abstract: Disclosed herein is a thermoplastic composition comprising a combination of 10 to 80 wt. % of a polyester, more than 0 to 50 wt. % of a polycarbonate, and 10 to 90 wt. % of at least one polyester-polycarbonate copolymer comprising, based on the total weight of the copolymer, 15 to 95 wt. % of arylate ester units, and 5 to 85 wt. % of aromatic carbonate units. Also disclosed is a method of forming the compositions, and articles prepared therefrom, for example transparent covers.Type: GrantFiled: June 19, 2007Date of Patent: April 6, 2010Assignee: Sabic Innovative Plastics IP B.V.Inventors: Parminder Agarwal, Shreyas Chakravarti, Bernard Schrauwen, Robert van de Grampel