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:
Feb. 25, 2025
Filed:
Jun. 11, 2021
Nissan Chemical Corporation, Tokyo, JP;
NISSAN CHEMICAL CORPORATION, Tokyo, JP;
Abstract
A method for producing an ion-exchange resin having a water content of 5% by weight or less, a method for producing a lithography coating film forming-composition using the ion-exchange resin, and a method for washing the ion-exchange resin. The methods include the step of passing an organic solvent having a water content of 150 ppm or less through an ion-exchange resin precursor having a water content of 40% by weight or more, where a dehydration efficiency defined by the following equation is 5 or more: Dehydration efficiency=Dehydration rate (%)/[Weight of the organic solvent used per unit weight of the ion-exchange resin precursor (kg/kg)×Washing time (h)].