Patents by Inventor Ruiwen WU

Ruiwen WU 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: 10752728
    Abstract: The invention relates to a polyisocyanate which is based on tolylene 2,4-diisocyanate, tolylene 2,6-diisocyanate or a mixture of tolylene 2,4- and 2,6-diisocyanate and has isocyanurate groups, wherein the polyisocyanate has a) a weight average molecular weight of from ?350 to ?800 g/mol, determined by means of gel permeation chromatography using a polystyrene standard and tetrahydrofuran as eluent in accordance with DIN 55672-1:2016-03, b) a polydispersity D of from >1 to ?1.5, where the polydispersity D is the ratio of weight average and number average molecular weight of the polyisocyanate and the weight average and number average molecular weight are in each case determined by means of gel permeation chromatography using a polystyrene standard and tetrahydrofuran as eluent in accordance with DIN 55672-1:2016-03, and c) a content of monomeric tolylene diisocyanate of ?1% by weight, based on the total weight of the polyisocyanate.
    Type: Grant
    Filed: October 18, 2017
    Date of Patent: August 25, 2020
    Assignee: Covestro Deutschland AG
    Inventors: Christoph Irle, Stefan Groth, Ruiwen Wu, Antonio Midolo, Robert Maleika, Hongchao Li, Hao Liu
  • Patent number: 10730997
    Abstract: The invention relates to a polyisocyanate mixture comprising at least one polyisocyanurate which is based on tolylene diisocyanate and has isocyanate groups and at least one polyurethane which is based on tolylene diisocyanate and has isocyanate groups, wherein the polyisocyanate mixture has a) a solids content of from ?51 to ?90% by weight, based on the total weight of the polyisocyanate mixture and b) a content of monomeric tolylene diisocyanate of ?0.9% by weight, based on the total weight of the polyisocyanate mixture, and the polyisocyanurate which is based on tolylene diisocyanate and has isocyanate groups has a polydispersity D of from ?1 to ?1.
    Type: Grant
    Filed: October 18, 2017
    Date of Patent: August 4, 2020
    Assignee: Covestro Deutschland AG
    Inventors: Christoph Irle, Stefan Groth, Ruiwen Wu, Antonio Midolo, Robert Maleika, Hongchao Li, Hao Liu
  • Publication number: 20200115328
    Abstract: The invention relates to a process for producing a polyisocyanate composition comprising addition of at least one isocyanate-inert solvent to at least one polyisocyanate, characterized in that the addition of the solvent is carried out in one or more stages and at least one of these stages is performed as a continuous dilution. The invention further relates to the polyisocyanate compositions obtainable by the process, to the use of the polyisocyanate compositions, to a two-component system containing the polyisocyanate composition and to composite systems produced with the two-component system.
    Type: Application
    Filed: July 2, 2018
    Publication date: April 16, 2020
    Inventors: Stefan Groth, Ruiwen Wu, Antonio Midolo
  • Publication number: 20190270842
    Abstract: The invention relates to a polyisocyanate which is based on tolylene 2,4-diisocyanate, tolylene 2,6-diisocyanate or a mixture of tolylene 2,4- and 2,6-diisocyanate and has isocyanurate groups, wherein the polyisocyanate has a) a weight average molecular weight of from ?350 to ?800 g/mol, determined by means of gel permeation chromatography using a polystyrene standard and tetrahydrofuran as eluent in accordance with DIN 55672-1:2016-03, b) a polydispersity D of from >1 to ?1.5, where the polydispersity D is the ratio of weight average and number average molecular weight of the polyisocyanate and the weight average and number average molecular weight are in each case determined by means of gel permeation chromatography using a polystyrene standard and tetrahydrofuran as eluent in accordance with DIN 55672-1:2016-03, and c) a content of monomeric tolylene diisocyanate of ?1% by weight, based on the total weight of the polyisocyanate.
    Type: Application
    Filed: October 18, 2017
    Publication date: September 5, 2019
    Applicant: COVESTRO DEUTSCHLAND AG
    Inventors: Christoph IRLE, Stefan GROTH, Ruiwen WU, Antonio MIDOLO, Robert MALEIKA, Hongchao LI, Hao LIU
  • Publication number: 20190270843
    Abstract: The invention relates to a polyisocyanate mixture comprising at least one polyisocyanurate which is based on tolylene diisocyanate and has isocyanate groups and at least one polyurethane which is based on tolylene diisocyanate and has isocyanate groups, wherein the polyisocyanate mixture has a) a solids content of from ?51 to ?90% by weight, based on the total weight of the polyisocyanate mixture and b) a content of monomeric tolylene diisocyanate of ?0.9% by weight, based on the total weight of the polyisocyanate mixture, and the polyisocyanurate which is based on tolylene diisocyanate and has isocyanate groups has a polydispersity D of from ?1 to ?1.
    Type: Application
    Filed: October 18, 2017
    Publication date: September 5, 2019
    Applicant: COVESTRO DEUTSCHLAND AG
    Inventors: Christoph IRLE, Stefan GROTH, Ruiwen WU, Antonio MIDOLO, Robert MALEIKA, Hongchao LI, Hao LIU