Patents by Inventor Qinhua ZHANG

Qinhua ZHANG 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).

  • ABS RUBBER POWDER WITH LOW IMPURITY CONTENT, PREPARATION METHOD THEREFOR, AND ABS RESIN
    Publication number: 20230018924
    Abstract: Disclosed in the present invention are ABS rubber powder with a low impurity content, a preparation method therefor, and an ABS resin. The ABS rubber powder is treated by using the following steps: washing the ABS rubber powder with a washing solution I, and monitoring the content of soluble organic carbon in the ABS rubber powder until the content of soluble organic carbon in the ABS rubber powder is less than or equal to 9000 ppm, so as to obtain the ABS rubber powder with the low impurity content. In the present invention, by controlling the content of soluble organic carbon or the contents of soluble organic carbon and iron ions in the ABS powder, the ABS resin with a low yellow index of less than or equal to 18 is obtained.
    Type: Application
    Filed: December 23, 2019
    Publication date: January 19, 2023
    Applicant: WANHUA CHEMICAL GROUP CO., LTD.
    Inventors: Qiang HAN, Qinhua ZHANG, Ning MA, Yibing ZHAO, Shuangyi SUN, Bo LIU, Yifeng SUN