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公开(公告)号：US11820942B2
公开(公告)日：2023-11-21
申请号：US17630811
申请日：2020-01-22
Applicant: Dow Global Technologies LLC
Inventor： Praveen Agarwal
IPC: C09K8/80 , C09K8/62 , E21B43/267
CPC classification number: C09K8/805 , C09K8/62 , E21B43/267
Abstract: Coated proppant particles are prepared by coating the particles with a coating composition that includes at least one polyisocyanate and at least one ingredient selected from i) an isocyanate trimerization catalyst, ii) a carbodiimide catalyst, iii) an alcohol, iv) a polyamine and v) an alkanolamine, and curing the coating composition. Starch is present during at least part of the curing step, such that the starch becomes embedded in at least a portion of the cured coating. The coating composition cures rapidly at moderate temperatures, and bonds to itself well under conditions of heat and pressure as are experienced by the particles in subterranean formations.
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公开(公告)号：US20220025249A1
公开(公告)日：2022-01-27
申请号：US17296871
申请日：2019-12-06
Applicant: Dow Global Technologies LLC
Inventor： Praveen Agarwal , Arjun Raghuraman , Juan Carlos Medina
Abstract: A continuous process for forming a coated proppant, said process comprising the steps of: (a) washing particles, (b) drying the particles at a first predetermined temperature, (c) cooling the particles, (d) feeding the cooled particles with a second predetermined temperature lower than the first predetermined temperature to an inlet of a combined continuous mixer and conveyor unit, (e) feeding a coating composition into the combined continuous mixer and conveyor unit, (f) mixing and simultaneously conveying the particles and the coating composition for a predetermined time, (g) curing the coating composition by transfer of heat from the particles, (h) discharging the coated particles from an outlet of the combined continuous mixer and conveyor unit, wherein said process does not comprise a step of heating the particles after the drying.
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公开(公告)号：US11667830B2
公开(公告)日：2023-06-06
申请号：US17296871
申请日：2019-12-06
Applicant: Dow Global Technologies LLC
Inventor： Praveen Agarwal , Arjun Raghuraman , Juan Carlos Medina
Abstract: A continuous process for forming a coated proppant, said process comprising the steps of: (a) washing particles, (b) drying the particles at a first predetermined temperature, (c) cooling the particles, (d) feeding the cooled particles with a second predetermined temperature lower than the first predetermined temperature to an inlet of a combined continuous mixer and conveyor unit, (e) feeding a coating composition into the combined continuous mixer and conveyor unit, (f) mixing and simultaneously conveying the particles and the coating composition for a predetermined time, (g) curing the coating composition by transfer of heat from the particles, (h) discharging the coated particles from an outlet of the combined continuous mixer and conveyor unit, wherein said process does not comprise a step of heating the particles after the drying.
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公开(公告)号：US20220153994A1
公开(公告)日：2022-05-19
申请号：US17438456
申请日：2020-03-23
Applicant: Dow Global Technologies LLC
Inventor： Bindu Krishnan , Praveen Agarwal , William J. Harris , Qiuyun Xu , Rajat Duggal
Abstract: Polyurethanes are made by reacting, in one or more reaction steps, a) at least one organic polyisocyanate, b-1) one or more polyols having a hydroxyl equivalent weight of greater than 250 g/mol and a nominal hydroxyl functionality of 2 to 4 and b-2) at least one alkoxylated Mannich base to produce a polyurethane polymer having a density of at least 750 kg/m3 and a hard segment content of 20 to 80% by weight.
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公开(公告)号：US20200009511A1
公开(公告)日：2020-01-09
申请号：US16494948
申请日：2018-03-20
Applicant: DOW GLOBAL TECHNOLOGIES LLC
Inventor： Praveen Agarwal , Peter E. M. Aerts , Tamara Dikic , Shouren Ge , Robert E. Hefner , Yuanqiao Rao , Bart G. M. Rijksen , Ian A. Tomlinson
Abstract: A composite membrane including a porous support and a thin film layer comprising a reaction product of: i) a polymer comprising a sub-unit including a Troger's base moiety represented by Formula I: wherein L includes an arylene group substituted with at least one carboxylic acid or a corresponding salt or ester group, or a hydroxyl; and ii) a crosslinking agent selected from at least one of: a) a multifunctional epoxy compound and b) a multifunctional azide compound.
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Patent Agency Ranking
公开(公告)号：US20240400877A1
公开(公告)日：2024-12-05
申请号：US18262771
申请日：2022-05-04
Applicant: Dow Global Technologies LLC , Dow Silicones Corporation
Inventor： Praveen Agarwal , William J. Harris , Chi-Hao Chang
IPC: C09K5/14 , C08G18/12 , C08G18/20 , C08G18/22 , C08G18/50 , C08K9/06 , C09D7/45 , C09D7/62 , C09D7/65 , C09D175/12 , H01M10/653 , H01M10/6551
Abstract: Thermally conductive compositions include a blocked isocyanate prepolymer composition containing an isocyanate prepolymer blocked with one or more of alkylphenol or alkenylphenol; and an amine composition containing: one or more polyetheramines, and one or more catalysts selected from a group consisting of carboxy late salts, tertiary amines, amidines, guanidines, and diazabicyclo compounds; and a thermally conductive filler present at a percent by weight of the thermally conductive composition (wt %) in a range of 60 wt % to 98 wt %; wherein the thermally conductive composition cures at a temperature in the range of 18° C. to 35° C. when the blocked isocyanate prepolymer composition and the amine composition are mixed. Methods include preparing a thermally conductive gap filler prepared by combining a blocked isocyanate prepolymer composition and an amine composition, and curing the resulting thermally conductive composition, such as at room temperature.
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公开(公告)号：US12065615B2
公开(公告)日：2024-08-20
申请号：US17630808
申请日：2020-04-30
Applicant: Dow Global Technologies LLC
Inventor： Praveen Agarwal , Juan Carlos Medina
IPC: C09K8/80 , C09K8/62 , E21B43/267
CPC classification number: C09K8/805 , C09K8/62 , E21B43/267
Abstract: Coated proppant particles are prepared by coating the particles with at least one polyisocyanate, and at least one urethane catalyst, and starch is present during at least part of the curing step. The starch becomes incorporated into in at least a portion of the cured coating. The coating cures rapidly at moderate temperatures, and bonds to itself well under conditions of heat and pressure as are experienced by the particles in subterranean formations.
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公开(公告)号：US20220017814A1
公开(公告)日：2022-01-20
申请号：US17295115
申请日：2019-10-31
Applicant: Dow Global Technologies LLC
Inventor： Praveen Agarwal , Yifan Dong , Arjun Raghuraman , Aayush Shah , Juan Carlos Medina , Kshitish Patankar , Mark F. Sonnenschein
Abstract: Coated proppant particles are prepared from a coating composition that includes at least one polyisocyanate and an isocyanate trimerization catalyst. The coating composition preferably is devoid of an effective amount of a urethane, urea and carbodiimide catalyst. The coating composition cures rapidly at moderate temperatures, and bonds to itself well under conditions of heat and pressure as are experienced by the particles in subterranean formations.
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公开(公告)号：US20190031809A1
公开(公告)日：2019-01-31
申请号：US15534013
申请日：2015-12-07
Inventor： Praveen Agarwal , Shih-Wei Chang , Kathleen M. O'Connell , Roy R. Raghunath , Weijun Zhou
IPC: C08F293/00 , C08F226/06 , C08F220/14 , C08F220/18
Abstract: A polymer comprising: (a) polymerized units of 2-vinylpyridine; and (b) polymerized units of methyl methacrylate; a compound of formula (I) wherein R1 is hydrogen or methyl and R2 is a C6-C20 aliphatic polycyclic substituent; or a combination thereof.
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公开(公告)号：US20250075072A1
公开(公告)日：2025-03-06
申请号：US18558115
申请日：2022-05-04
Applicant: Dow Global Technologies LLC
Inventor： Praveen Agarwal , Rogelio Gamboa , Mohammad Arif Hossain , An Kaga
Abstract: Thermally conductive compositions include a blocked isocyanate prepolymer composition containing an isocyanate prepolymer blocked with one or more of alkylphenol or alkenylphenol; and an amine composition containing: one or more polyetheramines, and one or more plasticizers selected from esters of glycol ethers; and a thermally conductive filler present at a percent by weight of the thermally conductive composition (wt %) in a range of 60 wt % to 98 wt %; wherein the thermally conductive composition cures at a temperature in the range of 18° C. to 35° C. when the blocked isocyanate prepolymer composition and the amine composition are mixed.
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