Patents by Inventor Ananda M. Chatterjee
Ananda M. Chatterjee 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: 9630349Abstract: Improved solventless processing technology for additive blends containing a polymer carrier, including those which have high level of additives, is described. High concentrations of low-melting, sticky additives lead to phase separation and extrusion instability, such that pellets cannot be formed from such additive blends by traditional extrusion process. These blends include those with a high level of active additives that have been described in the literature as Type A Superblends. Here a polymer typically acts as the carrier of the additives. The new and improved technology involves the solid state compaction processing, using a tubular die, of such impossible-to-pelletize additive blends of the Type A composition to produce commercially useful pelletized additive blends.Type: GrantFiled: August 26, 2014Date of Patent: April 25, 2017Assignee: Ingenia Polymers, Inc.Inventors: Ananda M. Chatterjee, Sumitra Subrahmanyan
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Publication number: 20150122151Abstract: A melt extrusion process for producing pelletized 100% additive blends using additives with lower Hausner ratio and larger particle size with granular form, compared to powder form of additives; also additive blends produced by such process. Extrusion throughput rate is increased using granular additive particle form with lower Hausner ratio than that of powder form. The productivity and efficiency of the process is enhanced by using a larger particle size of additives. Additive blends and polymer stabilization agent blends can be added in post-polymerization processes in resin manufacturing plants to enhance the processing and performance properties of polymers.Type: ApplicationFiled: November 4, 2014Publication date: May 7, 2015Inventors: Ananda M. Chatterjee, Sumitra Subrahmanyan
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Publication number: 20150057398Abstract: Improved solventless processing technology for additive blends containing a polymer carrier, including those which have high level of additives, is described. High concentrations of low-melting, sticky additives lead to phase separation and extrusion instability, such that pellets cannot be formed from such additive blends by traditional extrusion process. These blends include those with a high level of active additives that have been described in the literature as Type A Superblends. Here a polymer typically acts as the carrier of the additives. The new and improved technology involves the solid state compaction processing, using a tubular die, of such impossible-to-pelletize additive blends of the Type A composition to produce commercially useful pelletized additive blends.Type: ApplicationFiled: August 26, 2014Publication date: February 26, 2015Inventors: Ananda M. Chatterjee, Sumitra Subrahmanyan
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Publication number: 20100152341Abstract: Compacted additive blends, or polymer stabilization agent blends, can be added during the post-polymerization process to enhance the processability performance of polymers. The addition of certain compaction aids, such as high melting or non-melting metallic silicates and others, increases the resistance to friability of the compacted additive pellets. These compaction aids are non-migratory during the compaction process and after introduction into the polymer resin and thus have no deleterious effects. The additive blend can contain a variety of suitable additives in addition to the compaction aids.Type: ApplicationFiled: December 9, 2009Publication date: June 17, 2010Applicant: Ingenia Polymers Inc.Inventors: Ananda M. Chatterjee, Tania M. LaFrance, Salvatore D'Uva
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Patent number: 6593004Abstract: This invention relates to novel extrusion coating compositions containing certain high melt flow, narrow molecular weight distribution polypropylene impact or random copolymers and composite articles comprising a substrate having such compositions melt extruded thereon.Type: GrantFiled: October 14, 1998Date of Patent: July 15, 2003Assignee: Union Carbide Chemicals & Plastics Technology CorporationInventor: Ananda M. Chatterjee
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Patent number: 5948839Abstract: Polypropylene impact copolymer compositions are provided which contain a homopolymer phase of predominantly homopolymeric polypropylene, a copolymer phase of copolymerized ethylene and propylene, and a nucleating agent. The inventive compositions have a rubber content (Fc) in the range of 25 to 45% by weight, a crystallization temperature in the range of 122 to 132.degree. C., a melt flow in the range of about 7 to about 60 dg/min, and a ratio of the intrinsic viscosity of the copolymer phase to the intrinsic viscosity of the homopolymer phase of 1.4 to about 1.9. The polypropylene impact copolymer compositions may be used to form cast films which preferably are soft, quiet, and suitable for use in products to be used next to the skin, such as diapers, adult incontinence pads and feminine hygiene products.Type: GrantFiled: May 28, 1997Date of Patent: September 7, 1999Assignee: Union Carbide Chemicals & Plastics Technology CorporationInventor: Ananda M. Chatterjee
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Patent number: 5922471Abstract: Polypropylene random copolymer resins and metallized, heat sealable cast films produced from such resins include (1) a polypropylene-.alpha.-olefin random copolymer such as a propylene-butene-1 or propylene-ethylene random copolymer and (2) an additive package including a synthetic amorphous silica, a hindered phenolic antioxidant, a processing stabilizer and an acid acceptor. The compositions according to the invention are useful for the preparation of metallized, heat sealable packaging films suitable for protecting goods, particularly goods requiring a long shelf life such as foods or semiconductor products.Type: GrantFiled: March 4, 1996Date of Patent: July 13, 1999Assignee: Union Carbide Chemicals & Plastics Technology CorporationInventor: Ananda M. Chatterjee
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Patent number: 5674630Abstract: Polypropylene impact copolymer compositions are provided which contain a homopolymer phase of predominantly homopolymeric polypropylene, a copolymer phase of copolymerized ethylene and propylene, and a nucleating agent. The inventive compositions have a rubber content (Fc) in the range of 25 to 45% by weight, a crystallization temperature in the range of 122.degree. to 132.degree. C., a melt flow in the range of about 7 to about 60 dg/min, and a ratio of the intrinsic viscosity of the copolymer phase to the intrinsic viscosity of the homopolymer phase of 1.4 to about 1.9. The polypropylene impact copolymer compositions may be used to form cast films which preferably are soft, quiet, and suitable for use in products to be used next to the skin, such as diapers, adult incontinence pads and feminine hygiene products.Type: GrantFiled: May 8, 1995Date of Patent: October 7, 1997Assignee: Union Carbide Chemicals & Plastics Technology CorporationInventor: Ananda M. Chatterjee
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Patent number: 5510413Abstract: Polymer compositions comprising .alpha.-olefin polymers and a minor proportion of synthetic basic zeolite are stabilized against the harmful effects of corrosion of metal surfaces when processed through mechanical equipment such as molds and extruders where the composition normally contacts metal surfaces.Type: GrantFiled: December 20, 1991Date of Patent: April 23, 1996Assignee: Shell Polypropylene CompanyInventors: James D. McCullough, Thomas F. Brownscombe, Ananda M. Chatterjee
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Patent number: 5338790Abstract: A polymer composition having a good balance of improved mechanical properties and optical properties such as low haze, which comprisesa) propylene-butene random copolymer,b) at least one additive, andc) a clarifying agent which is calcium montanate, at least one polyolefin wax or combinations thereof.Type: GrantFiled: July 14, 1993Date of Patent: August 16, 1994Assignee: Shell Oil CompanyInventor: Ananda M. Chatterjee
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Patent number: 5300539Abstract: This invention relates to a continuous process for incorporating additives into or onto polymer granules by high speed/high intensity mixing of entrained polymer granules and additive particles, wherein the additive is provided in the form of an additive dispersion.Type: GrantFiled: December 28, 1992Date of Patent: April 5, 1994Assignee: Shell Oil CompanyInventor: Ananda M. Chatterjee
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Patent number: 5266629Abstract: A crystallizable thermoplastic polymer composition is prepared by adding a small amount of a substantially graphitic non-turbostratic carbon to a polyketone polymer. The graphitic carbon acts as a nucleating agent, increasing the crystallization rate of polyketone polymer.Type: GrantFiled: November 20, 1992Date of Patent: November 30, 1993Assignee: Shell Oil CompanyInventors: Donald H. Weinkauf, Ananda M. Chatterjee
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Patent number: 5208275Abstract: The present invention includes:(i) a method for making a coated particulate comprising the steps offorming a polyolefin emulsion or dispersion;fluidizing additive particles;spraying the emulsion or dispersion on the fluidized additive particles; andforming discrete substantially coated additive particles;(ii) a coated particulate made by the above process; and(iii) a process for providing in-reactor stabilization of a polyolefin during a polymerization reaction using the coated additives prepared by the above described method.Type: GrantFiled: November 20, 1990Date of Patent: May 4, 1993Assignee: Shell Oil CompanyInventor: Ananda M. Chatterjee
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Patent number: 5141772Abstract: A low temperature process for coating polymer granules with additives in order to modify the properties of the polymer comprises contacting a fluidized bed of the polymer granules with an aqueous dispersion of additives.Type: GrantFiled: October 21, 1991Date of Patent: August 25, 1992Assignee: Shell Oil CompanyInventor: Ananda M. Chatterjee
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Patent number: 5135966Abstract: Blends of polypropylene, poly(3-hydroxybutyrate) or poly(3-hydroxybutyrate-3-hydroxyvalerate) and metal stearates are both photodegradable and biodegradable.Type: GrantFiled: November 26, 1991Date of Patent: August 4, 1992Assignee: Shell Oil CompanyInventors: Ananda M. Chatterjee, Joseph P. Salanitro
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Patent number: 5064878Abstract: The present invention includes:(i) a method for making a coated particulate comprising the steps offorming a polyolefin emulsion or dispersion;fluidizing additive particles;spraying the emulsion or dispersion on the fluidized additive particles; andforming discrete substantially coated additive particles;(ii) a coated particulate made by the above process; and(iii) a process for providing in-reactor stabilization of a polyolefin during a polymerization reaction using the coated additives prepared by the above described method.Type: GrantFiled: March 12, 1990Date of Patent: November 12, 1991Assignee: Shell Oil CompanyInventor: Ananda M. Chatterjee
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Patent number: 4960617Abstract: The present invention includes a coated polyolefin particle and a method for post-reactor stabilization of polyolefins comprising:melting a polyolefin wax;blending at least one additive into the liquid polyolefin wax;fluidizing polyolefin particles to be stabilized with a hot gas;spraying the liquid polyolefin wax containing at least one additive on the fluidized polyolefin particles, and forming at least partially coated polymer particles;maintaining the at least partially coated polymer particles and fluidized polyolefin particles at a temperature which is sufficiently high to prevent the formation of fibers from the wax and which enhances the formation of stabilized polymer particles.Type: GrantFiled: April 3, 1989Date of Patent: October 2, 1990Assignee: Shell Oil CompanyInventors: Ananda M. Chatterjee, Dale J. Wilpers
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Patent number: 4879141Abstract: The present invention includes:(i) a method for making a coated particulate comprising the steps ofheating until liquid a polyolefin wax;fluidizing with a hot gas, additive particles selected from the group comprising an antioxidant, a processing stabilizer, an acid acceptor, and mixtures thereof;spraying the liquid polyolefin wax on the heated fluidized additive particles; andmaintaining the fluidized additive particles at a temperature which is sufficient to prevent the formation of fibers and adequate to form discrete substantially coated additive particles;(ii) a coated particulate made by the above process; and(iii) a process for providing in-reactor stabilization of a polyolefin during a polymerization reaction, using the coated additives prepared by the above described method.Type: GrantFiled: December 27, 1988Date of Patent: November 7, 1989Assignee: Shell Oil CompanyInventor: Ananda M. Chatterjee
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Patent number: 4853426Abstract: The present invention includes:(i) a method for making a coated particulate comprising the steps ofheating until liquid a polyolefin wax;fluidizing with a hot gas, additive particles selected from the group comprising an antioxidant, a processing stabilizer, an acid acceptor, and mixtures thereof;spraying the liquid polyolefin wax on the heated fluidized additive particles, andmaintaining the fluidized additive particles at a temperature which is sufficient to prevent the formation of fibers and adequate to form discrete substantially coated additive particles;(ii) a coated particulate made by the above process; and(iii) a process for providing in-reactor stabilization of a polyolefin during a polymerization reaction, using the coated additives prepared by the above described method.Type: GrantFiled: January 25, 1988Date of Patent: August 1, 1989Assignee: Shell Oil CompanyInventor: Ananda M. Chatterjee
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Patent number: 4818799Abstract: A process for the in-reactor stabilization of an alpha olefin comprising the steps of sequentially:adding alpha olefin monomer into a polymerization reactor;adding a mixture of selectivity control agent and cocatalyst to the polymerization reactor;adding a procatalyst to the polymerization reactor;injecting an alkyl-aluminum-antioxidant into the polymerization reactor;injecting an acid acceptor into the polymerization reactor; andpolymerizing the monomers in the reactor.Type: GrantFiled: November 13, 1987Date of Patent: April 4, 1989Assignee: Shell Oil CompanyInventors: Ananda M. Chatterjee, Robert C. Job