Patents by Inventor Beert Jacobus Keestra
Beert Jacobus Keestra 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: 11448365Abstract: This invention relates to a pressure vessel comprising a hollow body comprising endless fibers embedded in a thermoplastic polymer, in which the thermoplastic polymer comprises one or more polyamides containing one or more aliphatic monomeric units, wherein the one or more polyamides have a CH2-ratio of at least 5.5 and less than 10, calculated by ? identifying the number of different aliphatic monomeric units in the one or more polyamides; ? determining the number of CH2 groups per aliphatic monomeric unit for each of these different aliphatic monomeric units; ? calculating the sum of the so determined numbers of CH2 groups; ? dividing said sum by the number of different aliphatic monomeric units in the one or more polyamides; taking into account only the aliphatic monomeric units present in the one or more polyamides in an amount of at least 10 wt % with respect to the total weight of the one or more polyamides.Type: GrantFiled: December 2, 2016Date of Patent: September 20, 2022Assignee: DSM IP ASSETS B.V.Inventors: Beert Jacobus Keestra, Tim Leonardus Maria Vorage, Godefridus Bernardus Wilhelmus Leonardus Ligthart
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Patent number: 11046023Abstract: The invention relates to a tape, comprising at least one layer comprising a. endless fiber in an total amount of at least 40 volume % as compared to the total volume of the layer and b. a thermoplastic matrix comprising one or more polyamides containing one or more aliphatic monomeric units, c. and optionally heat stabilizer, flame retardant, colorant, lubricant, mold release agent, UV stabilizer, impact modifier, laser absorbing additive as well as combinations thereof; wherein the one or more polyamides have a CH2-ratio of at least 5.Type: GrantFiled: December 2, 2016Date of Patent: June 29, 2021Assignee: DSM IP ASSETS B.V.Inventors: Beert Jacobus Keestra, Tim Leonardus Maria Vorage, Godefridus Bernardus Wilhelmus Leonardus Ligthart
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Publication number: 20190162244Abstract: Boot for a constant velocity joint of a polymer composition comprising a thermoplastic polyester elastomer, a first, fast diffusing wax having a weight loss of more than 0.6 wt. %, and a second slow diffusing wax having a weight loss of less than 0.4 wt. % after 2500 hours. Also a polymer composition is claimed.Type: ApplicationFiled: July 14, 2017Publication date: May 30, 2019Inventors: Beert Jacobus KEESTRA, Katarina TOMIC
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Publication number: 20180370157Abstract: The invention relates to a tape, comprising at least one layer comprising a. endless fiber in an total amount of at least 40 volume % as compared to the total volume of the layer and b. a thermoplastic matrix comprising one or more polyamides containing one or more aliphatic monomeric units, c. and optionally heat stabilizer, flame retardant, colorant, lubricant, mold release agent, UV stabilizer, impact modifier, laser absorbing additive as well as combinations thereof; wherein the one or more polyamides have a CH2-ratio of at least 5.Type: ApplicationFiled: December 2, 2016Publication date: December 27, 2018Inventors: Beert Jacobus KEESTRA, Tim Leonardus Maria VORAGE, Godefridus Bernardus Wilhelmus Leonardus LIGTHART
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Publication number: 20180363849Abstract: This invention relates to a pressure vessel comprising a hollow body comprising endless fibers embedded in a thermoplastic polymer, in which the thermoplastic polymer comprises one or more polyamides containing one or more aliphatic monomeric units, wherein the one or more polyamides have a CH2-ratio of at least 5.5 and less than 10, calculated by ? identifying the number of different aliphatic monomeric units in the one or more polyamides; ? determining the number of CH2 groups per aliphatic monomeric unit for each of these different aliphatic monomeric units; ? calculating the sum of the so determined numbers of CH2 groups; ? dividing said sum by the number of different aliphatic monomeric units in the one or more polyamides; taking into account only the aliphatic monomeric units present in the one or more polyamides in an amount of at least 10 wt % with respect to the total weight of the one or more polyamides.Type: ApplicationFiled: December 2, 2016Publication date: December 20, 2018Inventors: Beert Jacobus KEESTRA, Tim Leonardus Maria VORAGE, Godefridus Bernardus Wilhelmus Leonardus LIGTHART
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Patent number: 10040904Abstract: Process for the production of a thermoplastic polymer comprising segments of a diamide, the process comprising: 1) a first step of preparing a reaction mixture comprising a diamine H2N—Y—NH2 Form. (I), and a diester of a dicarboxylic acid Form. (II) 2) a second step of heating the reaction mixture to a temperature at least 5° C. above the crystallization temperature of the diester and a least 5° C. below the melting temperature of the formed amide (formula III) in the presence of an alkaline or earth alkaline alkoxy catalyst Form. (III) wherein X and Y are the same or different and are an aliphatic group comprising 2-12 carbon atoms or an aromatic group comprising 6-20 carbon atoms, R1 and R2 are the same or different and are an aliphatic group comprising 2-15 carbon atoms and wherein R equals R1 or R2 and are the same or different.Type: GrantFiled: July 10, 2014Date of Patent: August 7, 2018Assignee: DSM IP ASSETS B.V.Inventors: Wilhelmus Petrus Johannes Appel, Carel Frederik Constantijn Fitié, Atze Jan Nijenhuis, Beert Jacobus Keestra, Josien Krijgsman, Michel Henri Chrétien Joseph Van Houtem, Henricus Marie Janssen
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Patent number: 9676899Abstract: The invention relates to a radiation curable resin composition comprising a cationically polymerizable component, a cationic photoinitiator, a hydroxy component, an impact modifier and wherein the resin composition after full cure has a modulus of >2 GPa; a yield stress <70 MPa; and a K1c value >1.3 MPa·(m)1/2 or an Izod value >0.45 J/cm. The resin composition can preferably be used in the preparation of three dimensional objects.Type: GrantFiled: April 26, 2007Date of Patent: June 13, 2017Assignee: DSM IP ASSETS B.V.Inventors: Paulus Antonius Maria Steeman, Beert Jacobus Keestra, Marco Marcus Matheus Driessen, Debra Lynn Fish Repko, Melvin Zussman
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Patent number: 9457515Abstract: The invention relates to a liquid radiation curable resin capable of curing into a solid upon irradiation comprising: (A) from about 0 to about 12 wt % of a cycloaliphatic epoxide having a linking ester group; (B) from about 30 to about 65 wt % of one or more epoxy functional components other than A; (C) from about 10 to about 30 wt % of one or more oxetanes; (D) from, about 1 to about 10 wt % of one or more polyols; (E) from about 2 to about 20 wt % of one or more radically curable (meth) acrylate components; (F) from about 2 to about 12 wt % of one or more impact modifiers; (G) from about 0.1 to about 8 wt % of one or more free radical photoinitiators; and (H) from about 0.1 to about 8 wt % of one or more cationic photoinitiators; wherein the liquid radiation curable resin has a viscosity at 30° C. of from about 600 cps to about 1300 cps.Type: GrantFiled: August 6, 2013Date of Patent: October 4, 2016Assignee: DSM IP Assets B.V.Inventors: John Southwell, Brett A. Register, Satyendra Kumar Sarmah, Paulus Antonius Maria Steeman, Beert Jacobus Keestra, Marcus Matheus Driessen
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Publication number: 20160200869Abstract: Process for the production of a thermoplastic polymer comprising segments of a diamide, the process comprising: 1) a first step of preparing a reaction mixture comprising a diamine H2N—Y—NH2 Form. (I), and a diester of a dicarboxylic acid Form. (II) 2) a second step of heating the reaction mixture to a temperature at least 5° C. above the crystallization temperature of the diester and a least 5° C. below the melting temperature of the formed amide (formula III) in the presence of an alkaline or earth alkaline alkoxy catalyst Form. (III) wherein X and Y are the same or different and are an aliphatic group comprising 2-12 carbon atoms or an aromatic group comprising 6-20 carbon atoms, R1 and R2 are the same or different and are an aliphatic group comprising 2-15 carbon atoms and wherein R equals R1 or R2 and are the same or different.Type: ApplicationFiled: July 10, 2014Publication date: July 14, 2016Inventors: Wilhelmus Petrus Johannes APPEL, Carel Frederik Constantijn FITIÉ, Atze Jan NIJENHUIS, Beert Jacobus KEESTRA, Josien KRIJGSMAN, Michel Henri Chrétien Joseph VAN HOUTEM, Henricus Marie JANSSEN
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Publication number: 20160009901Abstract: A polymer composition comprising:—a thermoplastic copolyetherester elastomer comprising 65-90 wt. % of soft segments derived from poly(tetrahydrofuran)diol (pTHF), having a number average molecular weight (Mn) of between 2000 and 4000 kg/kmol.-at least 30 wt % of a metal hydrate.Type: ApplicationFiled: February 20, 2014Publication date: January 14, 2016Inventors: Beert Jacobus KEESTRA, Angelika SCHMIDT
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Publication number: 20160002463Abstract: Cover for an electrical cable or electrical wire and a part of an electrical cable characterized in that the cover and the part consists of a polymer composition comprising a thermoplastic copolyetherester elastomer comprising 75-85 wt. % soft segments derived from poly(tetrahydrofuran) diol (pTHF) having a number average molecular weight (Mn) of 2500-4000 kg/kmol.Type: ApplicationFiled: February 20, 2014Publication date: January 7, 2016Inventors: Beert Jacobus KEESTRA, Angelika SCHMIDT
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Publication number: 20160005505Abstract: A polymer composition comprising:—a thermoplastic copolyetherester elastomer comprising 40-65 wt. % of soft segments derived from poly(tetrahydrofuran)diol (pTHF), having a number average molecular weight (Mn) of between 1000 and 2500 kg/kmol.—at least 15 wt % of a metal hydrate,—at least 12.5 wt. % of an oligomeric phosphate ester.Type: ApplicationFiled: February 20, 2014Publication date: January 7, 2016Inventors: Beert Jacobus KEESTRA, Angelika SCHMIDT
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Publication number: 20150340122Abstract: Electrical cable comprising a cable cover of a polymer composition, having a diameter of below 7 mm, which polymer composition contains a matting agent and a mold release agent and/or an external lubricant.Type: ApplicationFiled: December 13, 2013Publication date: November 26, 2015Inventors: Beert Jacobus KEESTRA, Angelika SCHMIDT
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Publication number: 20150072150Abstract: Polymer composition containing a thermoplastic elastomer, comprising hard segments of a polyester and/or a polyurethane and soft segments of an aliphatic polycarbonate, which composition contains polycarbonate. An insulated wire comprising an insulation layer of the polymer composition.Type: ApplicationFiled: March 26, 2013Publication date: March 12, 2015Inventors: Beert Jacobus Keestra, Angelika Schmidt, Agnes Johanna Pauline Björling
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Publication number: 20140035202Abstract: The invention relates to a liquid radiation curable resin capable of curing into a solid upon irradiation comprising: (A) from about 0 to about 12 wt % of a cycloaliphatic epoxide having a linking ester group; (B) from about 30 to about 65 wt % of one or more epoxy functional components other than A; (C) from about 10 to about 30 wt % of one or more oxetanes; (D) from, about 1 to about 10 wt % of one or more polyols; (E) from about 2 to about 20 wt % of one or more radically curable (meth)acrylate components; (F) from about 2 to about 12 wt % of one or more impact modifiers; (G) from about 0.1 to about 8 wt % of one or more free radical photoinitiators; and (H) from about 0.1 to about 8 wt % of one or more cationic photoinitiators; wherein the liquid radiation curable resin has a viscosity at 30° C. of from about 600 cps to about 1300 cps.Type: ApplicationFiled: August 6, 2013Publication date: February 6, 2014Applicant: DSM IP ASSETS B.V.Inventors: John Southwell, Brett A. Register, Satyendra Kumar Sarmah, Paulus Antonius Maria Steeman, Beert Jacobus Keestra, Marcus Matheus Driessen
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Patent number: 8501033Abstract: The invention relates to a liquid radiation curable resin capable of curing into a solid upon irradiation comprising: (A) from about 0 to about 12 wt % of a cycloaliphatic epoxide having a linking ester group; (B) from about 30 to about 65 wt % of one or more epoxy functional components other than A; (C) from about 10 to about 30 wt % of one or more oxetanes; (D) from, about 1 to about 10 wt % of one or more polyols; (E) from about 2 to about 20 wt % of one or more radically curable (meth)acrylate components; (F) from about 2 to about 12 wt % of one or more impact modifiers; (G) from about 0.1 to about 8 wt % of one or more free radical photoinitiators; and (H) from about 0.1 to about 8 wt % of one or more cationic photoinitiators; wherein the liquid radiation curable resin has a viscosity at 30° C. of from about 600 cps to about 1300 cps.Type: GrantFiled: March 12, 2010Date of Patent: August 6, 2013Assignee: DSM IP Assets B.V.Inventors: John Southwell, Brett A. Register, Satyendra Kumar Sarmah, Paulus Antonius Maria Steeman, Beert Jacobus Keestra, Marcus Matheus Driessen
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Publication number: 20120282439Abstract: The invention relates to a radiation curable resin composition comprising a cationically polymerizable component, a cationic photoinitiator, a hydroxy component, and an impact modifier. The resin composition can preferably be used in the preparation of three dimensional objects.Type: ApplicationFiled: July 19, 2012Publication date: November 8, 2012Applicant: DSM IP ASSETS B.V.Inventors: Paulus Antonius Maria STEEMAN, Beert Jacobus Keestra, Marco Marcus Matheus Driessen, Debra Lynn Fish Repko, Melvin Zussman
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Publication number: 20110104500Abstract: The invention relates to a liquid radiation curable resin capable of curing into a solid upon irradiation comprising: (A) from about 0 to about 12 wt % of a cycloaliphatic epoxide having a linking ester group; (B) from about 30 to about 65 wt % of one or more epoxy functional components other than A; (C) from about 10 to about 30 wt % of one or more oxetanes; (D) from, about 1 to about 10 wt % of one or more polyols; (E) from about 2 to about 20 wt % of one or more radically curable (meth) acrylate components; (F) from about 2 to about 12 wt % of one or more impact modifiers; (G) from about 0.1 to about 8 wt % of one or more free radical photoinitiators; and (H) from about 0.1 to about 8 wt % of one or more cationic photoinitiators; wherein the liquid radiation curable resin has a viscosity at 30° C. of from about 600 cps to about 1300 cps.Type: ApplicationFiled: March 12, 2010Publication date: May 5, 2011Inventors: John Southwell, Brett A. Register, Satyendra Kumar Sarmah, Pauius Antonius Maria Steeman, Beert Jacobus Keestra, Marcus Matheus Driessen
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Publication number: 20100329617Abstract: The invention relates to a radiation-curable primary coating composition comprising 0.6-10 vol % of particles which when cured has an equilibrium modulus of about 1.5 MPa or less, and a cavitation strength at which a tenth cavity appears (?10cav) of at least about 1.1 MPa.Type: ApplicationFiled: December 4, 2007Publication date: December 30, 2010Inventors: Markus Johannes Henricus Bulters, Paulus Antonius Maria Steeman, Aylvin Jorge Angelo Athanasi Dias, Beert Jacobus Keestra
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Publication number: 20100304088Abstract: The invention relates to a radiation curable resin composition comprising a cationically polymerizable component, a cationic photoinitiator, a hydroxy component, an impact modifier and wherein the resin composition after full cure has a modulus of >2 GPa; a yield stress<70 MPa; and a K1c value>1.3 MPa. (m)1/2 or an Izod value>0.45 J/cm. The resin composition can preferably be used in the preparation of three dimensional objects.Type: ApplicationFiled: April 26, 2007Publication date: December 2, 2010Inventors: Paulus Antonius Maria Steeman, Beert Jacobus Keestra, Marco Marcus Matheus Driessen, Debra Lynn Fish Repko, Melvin Zussman