The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 12, 2020
Filed:
Mar. 30, 2018
Sekisui Chemical Co., Ltd., Osaka, JP;
Sekisui Specialty Chemicals America, Llc, Dallas, TX (US);
Yohei Nishimura, Osaka, JP;
Yasunari Kusaka, Osaka, JP;
Nami Nakajima, Osaka, JP;
Hidehiro Yamaguchi, Dallas, TX (US);
SEKISUI CHEMICAL CO., LTD., Osaka, JP;
SEKISUI SPECIALITY CHEMICALS AMERICA, LLC, Dallas, TX (US);
Abstract
The polyvinyl alcohol according to the present invention to be used as a dispersant for suspension polymerization for polyvinyl chloride has a degree of saponification of 60 to 80 mol %, a block character of 0.4 to 0.6, an integration value defined by the following (a) of 0.04 to 0.1 and an integration value defined by the following (b) of 0.01 to 0.2 in aH-NMR spectrum, and a 0.1% by mass aqueous solution of the polyvinyl alcohol has a UV absorbance at a wavelength of 320 nm of 0.18 or more and less than 0.3.