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:
Jan. 06, 2026
Filed:
Sep. 25, 2020
Wanhua Chemical Group Co., Ltd., Shandong, CN;
Wanhua Chemical (Ningbo) Co., Ltd., Zhejiang, CN;
Nuancheng Wang, Shandong, CN;
Yonghua Shang, Shandong, CN;
Bin Shi, Shandong, CN;
Yuqi Wang, Shandong, CN;
Lidong Sun, Shandong, CN;
Weijing Fan, Shandong, CN;
Chengyue Yan, Shandong, CN;
WANHUA CHEMICAL GROUP CO., LTD., Shandong, CN;
WANHUA CHEMICAL (NINGBO) CO., LTD., Zhejiang, CN;
Abstract
The present invention provides an isocyanurate-containing polyisocyanate composition with stable chromaticity, and a preparation method thereof, belonging to the technical field of polyisocyanate composition preparation. The preparation method comprises: an isocyanate monomer being polymerized in the presence of a catalyst, after the reaction is terminated, obtaining a prepolymer, subjecting the prepolymer to separation treatment and heat treatment, and obtaining the polyisocyanate composition containing isocyanurate; based on the weight of the polyisocyanate composition, the cleavable amine content of the polyisocyanate composition is less than or equal to 20 ppm. By means of controlling the cleavable amine content of the polyisocyanate composition, the present invention causes the resulting isocyanurate-containing polyisocyanate composition to have stable storage chromaticity, and the present invention has a chrominance increase of ≤10 Hazen when stored at 40° C. for 12 months.