Patents by Inventor Roy U. Rojas-Wahl

Roy U. Rojas-Wahl 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: 9790307
    Abstract: A process for producing a silane-crosslinked polyolefin which comprises exposing a polyolefin containing at least one [1,3,2]-dioxasilinane ring structure to moisture in the presence of an organic carboxylic acid, which is used as a hydrolysis and condensation catalyst and does not contain tin, thereby producing the silane-crosslinked polyolefin, wherein the polyolefin containing at least one [1,3,2]-dioxasilinane ring structure is made by the process of grafting an olefinically unsaturated [1,3,2]-dioxasilinane to a polyolefin in the presence of a free radical initiator. There is also provided the resulting silane-crosslinked polyolefin and the graftable silane composition used in the process.
    Type: Grant
    Filed: December 12, 2014
    Date of Patent: October 17, 2017
    Assignee: Momentive Performance Materials Inc.
    Inventors: Samim Alam, Roy U. Rojas Wahl
  • Patent number: 9434820
    Abstract: Thermoplastic resin polymer compositions having a block of random polysiloxane co- or terpolymer structure, such as substituted phenyl-terminated polysiloxane co- or terpolymers having the general structure: provide improved flame resistance, optical clarity, and better low-temperature impact strength compared to conventional blends, additives, and copolymers. The substituted phenyl terminated polysiloxanes may be used to make various polysiloxane-thermoplastic resin polymer and polymer blends, as well as articles including such polysiloxane-thermoplastic resin polymer and blends.
    Type: Grant
    Filed: September 18, 2015
    Date of Patent: September 6, 2016
    Assignee: Momentive Performance Material Inc.
    Inventors: Anuj Mittal, Narayan Padmanabha Iyer, Samim Alam, Indumathi Ramakrishnan, Roy U. Rojas-Wahl
  • Patent number: 9428617
    Abstract: An ?,?-functionalized polyoxyalkylene-siloxane polymer having the general structural Formula (I): provides improved hydrophilicity and hemocompatibility. The ?,?-functionalized polyoxyalkylene-siloxane polymer may be used to make various polycarbonate/?,?-functionalized polyoxyalkylene-siloxane copolymers and polymer blends, as well as articles including such copolymers and blends.
    Type: Grant
    Filed: September 18, 2015
    Date of Patent: August 30, 2016
    Assignee: Momentive Performance Material Inc.
    Inventors: Anuj Mittal, Laxmi Samantara, Samim Alam, Anubhav Saxena, Indumathi Ramakrishnan, Roy U. Rojas-Wahl
  • Publication number: 20160083528
    Abstract: An ?,?-functionalized polyoxyalkylene-siloxane polymer having the general structural Formula (I): provides improved hydrophilicity and hemocompatibility. The ?,?-functionalized polyoxyalkylene-siloxane polymer may be used to make various polycarbonate/?,?-functionalized polyoxyalkylene-siloxane copolymers and polymer blends, as well as articles including such copolymers and blends.
    Type: Application
    Filed: September 18, 2015
    Publication date: March 24, 2016
    Inventors: Anuj Mittal, Laxmi Samantara, Samim Alam, Anubhav Saxena, Indumathi Ramakrishnan, Roy U. Rojas-Wahl
  • Publication number: 20160083527
    Abstract: Thermoplastic resin polymer compositions having a block of random polysiloxane co- or terpolymer structure, such as substituted phenyl-terminated polysiloxane co- or terpolymers having the general structure: provide improved flame resistance, optical clarity, and better low-temperature impact strength compared to conventional blends, additives, and copolymers. The substituted phenyl terminated polysiloxanes may be used to make various polysiloxane-thermoplastic resin polymer and polymer blends, as well as articles including such polysiloxane-thermoplastic resin polymer and blends.
    Type: Application
    Filed: September 18, 2015
    Publication date: March 24, 2016
    Inventors: Anuj Mittal, Narayan Padmanabha Iyer, Samim Alam, Indumathi Ramakrishnan, Roy U. Rojas-Wahl
  • Publication number: 20150166708
    Abstract: A process for producing a silane-crosslinked polyolefin which comprises exposing a polyolefin containing at least one [1,3,2]-dioxasilinane ring structure to moisture in the presence of an organic carboxylic acid, which is used as a hydrolysis and condensation catalyst and does not contain tin, thereby producing the silane-crosslinked polyolefin, wherein the polyolefin containing at least one [1,3,2]-dioxasilinane ring structure is made by the process of grafting an olefinically unsaturated [1,3,2]-dioxasilinane to a polyolefin in the presence of a free radical initiator. There is also provided the resulting silane-crosslinked polyolefin and the graftable silane composition used in the process.
    Type: Application
    Filed: December 12, 2014
    Publication date: June 18, 2015
    Inventors: Samim Alam, Roy U. Rojas Wahl
  • Patent number: 7887785
    Abstract: A personal care composition comprising a silicone resin of the generic formula: MQ, wherein the ratio of M to Q is about from 0.01/1 to about 3.96/1; MxDyTz, wherein x is about 0.01 to about 3,900,000, y is about 0.035 to about 10,000,000, z is about 0.35 to about 8,000,000; TD, wherein the ratio of T to D is about 0.001/1 to about 73/1; or a combination comprising at least one of the foregoing resins, wherein the resin or resin combination is present in an amount effective to increase the SPF of the formulation at least about 10% over the same formulation without the resin or resin combination. The silicone resins are easily formulated, provide a unique non-tacky sensory experience and exhibit advantageous spreadability while permitting the introduction of additional functional benefits such as homogeneity, better organic compatibility, reduced skin irritation and improved skin feel or shine.
    Type: Grant
    Filed: April 14, 2005
    Date of Patent: February 15, 2011
    Assignee: Momentive Performance Materials Inc.
    Inventors: Roy U. Rojas-Wahl, An-Li Kuo, Suresh K. Rajaraman
  • Publication number: 20090247649
    Abstract: This invention describes cosmetic, cleaning and care products compositions made using an evaporable siloxane liquid support or carrier having the molecular formula: MvM?wDxTyQz where the subscripts may have the following values: x=0, 1, 2, 3, or 4; y=0.
    Type: Application
    Filed: June 4, 2009
    Publication date: October 1, 2009
    Inventors: Suresh K. Rajaraman, Mark D. Leatherman, Roy U. Rojas-Wahl, John S. Razzano