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:
Jul. 09, 2024
Filed:
May. 15, 2019
Nippon Shokubai Co., Ltd., Osaka, JP;
Ryota Wakabayashi, Himeji, JP;
Shin-ichi Fujino, Himeji, JP;
Mai Sato, Himeji, JP;
Yoshihiro Shobo, Himeji, JP;
Shin-ya Katsube, Himeji, JP;
Kunihiko Ishizaki, Himeji, JP;
NIPPON SHOKUBAI CO., LTD., Osaka, JP;
Abstract
A production method includes a surface-crosslinking step of heating a mixture of a surface-crosslinking agent and a particulate dried polymer obtained with an acid group-containing unsaturated monomer as a main component. A moisture content of the particulate dried polymer is not greater than 15% by mass. A heating device including a rotary container and a plurality of heating tubes that are located within the rotary container, extend in an axial direction of the rotary container, and rotate together with the rotary container, is used in the surface-crosslinking step. The heating device includes a means for introducing and discharging a gas into and from the rotary container.