Patents by Inventor Roo Da LEE

Roo Da LEE 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: 9683069
    Abstract: The present invention relates to a method for preparing a weather resistant reinforced acrylate based resin. More specifically, an activator-free conversion rate improver is included in an acrylate-styrene based graft copolymer, thereby improving the haze value, light transmittance, and yellow index when mixed with an acrylate-styrene based non-graft copolymer, and securing the weather resistance. In particular, according to the present invention, a weather resistant reinforced thermoplastic resin having excellent colors which are close to natural colors can be provided even without using sodium formaldehyde sulfoxylate (SFS) and iron ions.
    Type: Grant
    Filed: August 29, 2014
    Date of Patent: June 20, 2017
    Assignee: LG CHEM, LTD.
    Inventors: Roo Da Lee, Sang Hoo Park, Won Seok Lee, Seok Goo Jang, Jeong Su Choi, Jeun Hoon Yoo
  • Patent number: 9637583
    Abstract: The present invention provides a transparent acrylonitrile-butadiene-styrene (ABS) resin and a transparent ABS resin composition. Specifically, according to the present invention, a transparent ABS resin and a transparent ABS resin composition, which have excellent transparency and impact resistance, can be provided by minimizing the degree of impregnation of a styrene monomer into a polybutadiene rubber latex while allowing the styrene monomer to constitute a graft shell to thereby effectively form the graft shell. Particularly, according to the present invention, a transparent ABS resin composition having high transparency and impact resistance can be provided, despite applying a reducing agent and Fe ions, which adversely affected the transparency of ABS resin in the prior art, to ABS resin.
    Type: Grant
    Filed: August 21, 2014
    Date of Patent: May 2, 2017
    Assignee: LG CHEM, LTD.
    Inventors: Seok Goo Jang, Sang Hoo Park, Roo Da Lee, Won Seok Lee, Jeong Su Choi, Jeun Hoon Yoo
  • Publication number: 20160326362
    Abstract: The present invention relates to a method of preparing a thermoplastic resin. In accordance with the present invention, provided is a thermoplastic resin having superior antibiosis and melt-kneadability prepared through preparation of a graft copolymer latex and coagulation of the graft copolymer latex with a specific antimicrobial agent, and a method of preparing the thermoplastic resin to prepare a thermoplastic resin composition including the thermoplastic resin.
    Type: Application
    Filed: October 8, 2015
    Publication date: November 10, 2016
    Inventors: Hyun Taek OH, Jeong Su CHOI, Keun Hoon YOO, Bong Keun AHN, Won Seok LEE, Seok Goo JANG, Roo Da LEE, Sang Hoo PARK, Ho Hoon KIM, Hyung Seop SHIM
  • Publication number: 20160297915
    Abstract: The present invention relates to a method for preparing a weather resistant reinforced acrylate based resin. More specifically, an activator-free conversion rate improver is included in an acrylate-styrene based graft copolymer, thereby improving the haze value, light transmittance, and yellow index when mixed with an acrylate-styrene based non-graft copolymer, and securing the weather resistance. In particular, according to the present invention, a weather resistant reinforced thermoplastic resin having excellent colors which are close to natural colors can be provided even without using sodium formaldehyde sulfoxylate (SFS) and iron ions.
    Type: Application
    Filed: August 29, 2014
    Publication date: October 13, 2016
    Applicant: LG CHEM, LTD.
    Inventors: Roo Da LEE, Sang Hoo PARK, Won Seok LEE, Seok Goo JANG, Jeong Su CHOI, Jeun Hoon YOO
  • Publication number: 20160215083
    Abstract: The present invention provides a transparent acrylonitrile-butadiene-styrene (ABS) resin and a transparent ABS resin composition. Specifically, according to the present invention, a transparent ABS resin and a transparent ABS resin composition, which have excellent transparency and impact resistance, can be provided by minimizing the degree of impregnation of a styrene monomer into a polybutadiene rubber latex while allowing the styrene monomer to constitute a graft shell to thereby effectively form the graft shell. Particularly, according to the present invention, a transparent ABS resin composition having high transparency and impact resistance can be provided, despite applying a reducing agent and Fe ions, which adversely affected the transparency of ABS resin in the prior art, to ABS resin.
    Type: Application
    Filed: August 21, 2014
    Publication date: July 28, 2016
    Applicant: LG CHEM, LTD.,
    Inventors: Seok Goo JANG, Sang Hoo PARK, Roo Da LEE, Won Seok LEE, Jeong Su CHOI, Jeun Hoon YOO
  • Patent number: 8927631
    Abstract: Disclosed are a transparent thermoplastic resin composition and a molded article prepared therefrom. More particularly, disclosed are a transparent thermoplastic resin composition comprising A) 100 parts by weight of a rubber-reinforced thermoplastic transparent resin, and B) 0.01 to 2 parts by weight of a dihydrocarbyl pentaerythritol diphosphite wherein the A) rubber-reinforced thermoplastic transparent resin is prepared by polymerizing 5 to 60% by weight of a conjugated diene rubber, 20 to 70% by weight of a methacrylic acid alkyl ester monomer or an acrylic acid alkyl ester monomer, 8 to 50% by weight of an aromatic vinyl monomer and 0 to 20% by weight of a vinyl cyanide monomer, and a molded article prepared therefrom.
    Type: Grant
    Filed: February 18, 2014
    Date of Patent: January 6, 2015
    Assignee: LG Chem, Ltd.
    Inventors: Jeong Su Choi, Won Seok Lee, Seok Goo Jang, Roo Da Lee, Sang Hoo Park, Keun Hoon Yoo
  • Publication number: 20140296397
    Abstract: Disclosed are a transparent thermoplastic resin composition and a molded article prepared therefrom. More particularly, disclosed are a transparent thermoplastic resin composition comprising A) 100 parts by weight of a rubber-reinforced thermoplastic transparent resin, and B) 0.01 to 2 parts by weight of a dihydrocarbyl pentaerythritol diphosphite wherein the A) rubber-reinforced thermoplastic transparent resin is prepared by polymerizing 5 to 60% by weight of a conjugated diene rubber, 20 to 70% by weight of a methacrylic acid alkyl ester monomer or an acrylic acid alkyl ester monomer, 8 to 50% by weight of an aromatic vinyl monomer and 0 to 20% by weight of a vinyl cyanide monomer, and a molded article prepared therefrom. Advantageously, provided are a transparent thermoplastic resin composition which exhibits superior transparency, impact strength and processability and in particular, does not discolor even during long-term storage and does not discolor at 40 to 80° C.
    Type: Application
    Filed: February 18, 2014
    Publication date: October 2, 2014
    Applicant: LG CHEM, LTD
    Inventors: Jeong Su CHOI, Won Seok LEE, Seok Goo JANG, Roo Da LEE, Sang Hoo PARK, Keun Hoon YOO