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:
Sep. 01, 2026
Filed:
Sep. 25, 2020
Wanhua Chemical Group Co., Ltd., Yantai, CN;
Wanhua Chemical (Ningbo) Co., Ltd., Ningbo, CN;
Bin Shi, Yantai, CN;
Yonghua Shang, Yantai, CN;
Tao Yu, Yantai, CN;
Xianfeng Zhang, Yantai, CN;
Chengyue Yan, Yantai, CN;
Zhicheng Zhu, Yantai, CN;
Wei Liu, Yantai, CN;
Fuyou Lu, Yantai, CN;
Nuancheng Wang, Yantai, CN;
Yuqi Wang, Yantai, CN;
Yuan Li, Yantai, CN;
Xiaopeng Zhang, Yantai, CN;
Haijun Li, Yantai, CN;
WANHUA CHEMICAL GROUP CO., LTD., Yantai, CN;
WANHUA CHEMICAL (NINGBO) CO., LTD., Ningbo, CN;
Abstract
The present invention belongs to the technical field of preparing isocyanate derivatives, and particularly relates to a storage-stable polyisocyanate composition and a preparation method therefor. The method comprises: in the presence of a catalyst system, subjecting an isocyanate monomer to a polymerization reaction; terminating the reaction after a suitable conversion rate is reached, so as to obtain a polyisocyanate reaction solution; and then performing heat treatment on the obtained polyisocyanate reaction solution to obtain a heat-treated polyisocyanate mixture, wherein the heat treatment temperature is 10-30° C. higher than the heat-sensitive temperature of the obtained polyisocyanate product, and the heat treatment time is 5-30 min; and then performing separation treatment on the heat-treated polyisocyanate mixture. When the polyisocyanate composition of the present invention is stored at 50° C. for 30 days, the viscosity increase is small, thus the stability of the viscosity is ensured, and at the same time, the stability of the free monomer content and the color stability are also significantly improved.