Patents by Inventor Fook Peng LENG

Fook Peng LENG 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: 12163027
    Abstract: This invention provides a method of making an elastomeric article, and the method comprises dipping a mold into a first dip tank containing a compounded nitrile rubber formulation to produce an elastomeric film layer on the mold, the compounded nitrile rubber formulation comprising nitrile butadiene copolymer; a crosslinking agent; a metal oxide; a vulcanization accelerator; an antioxidant; an alkali agent; and a heat sensitizer; then drying and curing the elastomeric film layer to form the elastomeric article. The heat sensitizer may be an organopolysiloxane. Elastomeric articles prepared according to this invention may have a film thickness in a range of 0.020 mm to 0.050 mm; such films are suitable for medical examination gloves, surgical gloves, or condoms.
    Type: Grant
    Filed: July 20, 2022
    Date of Patent: December 10, 2024
    Assignee: KAREX HOLDINGS SDN. BHD.
    Inventors: Fook Peng Leng, Yi Yee Loh, Lai Peng Lim
  • Publication number: 20240043653
    Abstract: The present invention relates to a method of preparing reduced graphene oxide, incorporation of the reduced graphene oxide into polyisoprene latex to provide a polyisoprene latex graphene composite and elastomeric articles prepared using the polyisoprene latex-graphene composite. In particular, the reduction of graphene oxide is accomplished without the use of strong reducing agents and organic solvents and incorporation of the reduced graphene oxide into polyisoprene latex is accomplished using room temperature latex mixing method or hot maturation. The resultant composite exhibits good colloid stability and polyisoprene latex films produced from the composite exhibit good mechanical properties with improved ageing resistance.
    Type: Application
    Filed: October 18, 2023
    Publication date: February 8, 2024
    Inventors: Fook Peng LENG, Lai Peng LIM, Leng Kian GOH, Yi Yee LOH, Joon Ching JUAN, Nay Ming HUANG
  • Publication number: 20240026131
    Abstract: This invention provides a method of making an elastomeric article, and the method comprises dipping a mold into a first dip tank containing a compounded nitrile rubber formulation to produce an elastomeric film layer on the mold, the compounded nitrile rubber formulation comprising nitrile butadiene copolymer; a crosslinking agent; a metal oxide; a vulcanization accelerator; an antioxidant; an alkali agent; and a heat sensitizer; then drying and curing the elastomeric film layer to form the elastomeric article. The heat sensitizer may be an organopolysiloxane. Elastomeric articles prepared according to this invention may have a film thickness in a range of 0.020 mm to 0.050 mm; such films are suitable for medical examination gloves, surgical gloves, or condoms.
    Type: Application
    Filed: July 20, 2022
    Publication date: January 25, 2024
    Inventors: Fook Peng Leng, Yi Yee Loh, Lai Peng Lim
  • Patent number: 11827765
    Abstract: The present invention relates to a method of preparing reduced graphene oxide, incorporation of the reduced graphene oxide into polyisoprene latex to provide a polyisoprene latex graphene composite and elastomeric articles prepared using the polyisoprene latex-graphene composite. In particular, the reduction of graphene oxide is accomplished without the use of strong reducing agents and organic solvents and incorporation of the reduced graphene oxide into polyisoprene latex is accomplished using room temperature latex mixing method or hot maturation. The resultant composite exhibits good colloid stability and polyisoprene latex films produced from the composite exhibit good mechanical properties with improved ageing resistance.
    Type: Grant
    Filed: December 1, 2021
    Date of Patent: November 28, 2023
    Assignee: KAREX HOLDINGS SDN BHD.
    Inventors: Fook Peng Leng, Lai Peng Lim, Leng Kian Goh, Yi Yee Loh, Joon Ching Juan, Nay Ming Huang
  • Publication number: 20220089834
    Abstract: The present invention relates to a method of preparing reduced graphene oxide, incorporation of the reduced graphene oxide into polyisoprene latex to provide a polyisoprene latex graphene composite and elastomeric articles prepared using the polyisoprene latex-graphene composite. In particular, the reduction of graphene oxide is accomplished without the use of strong reducing agents and organic solvents and incorporation of the reduced graphene oxide into polyisoprene latex is accomplished using room temperature latex mixing method or hot maturation. The resultant composite exhibits good colloid stability and polyisoprene latex films produced from the composite exhibit good mechanical properties with improved ageing resistance.
    Type: Application
    Filed: December 1, 2021
    Publication date: March 24, 2022
    Inventors: Fook Peng LENG, Lai Peng Lim, Leng Kian Goh, Yi Yee Loh, Joon Ching Juan, Nay Ming Huang
  • Patent number: 11214664
    Abstract: The present invention relates to a method of preparing reduced graphene oxide, incorporation of the reduced graphene oxide into polyisoprene latex to provide a polyisoprene latex graphene composite and elastomeric articles prepared using the polyisoprene latex-graphene composite. In particular, the reduction of graphene oxide is accomplished without the use of strong reducing agents and organic solvents and incorporation of the reduced graphene oxide into polyisoprene latex is accomplished using room temperature latex mixing method or hot maturation. The resultant composite exhibits good colloid stability, and polyisoprene latex films produced the composite exhibit good mechanical properties with improved ageing resistance.
    Type: Grant
    Filed: October 31, 2017
    Date of Patent: January 4, 2022
    Assignee: KAREX HOLDINGS SDN BHD.
    Inventors: Fook Peng Leng, Lai Peng Lim, Leng Kian Goh, Yi Yee Loh, Joon Ching Juan, Nay Ming Huang
  • Publication number: 20190270863
    Abstract: The present Invention' relates to a method of preparing reduced grapheme oxide, Incorporation of the adduced graphene oxide into polyisoprene latex to provide a polyisoprene latex graphene composite and elastomerk articles prepared using the polyisoprene latex-graphene composite. In particular, the reduction of-graphene oxide is accomplished without the use of strong reducing agents and organic solvents and incorporation of die reduced graphene oxide into polyisoprene latex Is accomplished using room temperature latex mixing method or hot maturation. The resultant composite exhibits good colloid stability and polyisoprene latex films produced from the composite exhibit good mechanical properties with improved ageing resistance.
    Type: Application
    Filed: October 31, 2017
    Publication date: September 5, 2019
    Inventors: Fook Peng LENG, Lai Peng LIM, Leng Kian GOH, Yi Yee LOH, Joon Ching JUAN, Nay Ming HUANG