Inventor
SHANG YONGHUA
CN11 patents
⚠️ This page may combine multiple inventors who share the name “SHANG YONGHUA”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
WANHUA CHEMICAL GROUP CO LTD
10 patentsUS12264121B2Apr 1, 2025
1,3-bisisocyanatomethylcyclohexane composition and optical resin prepared therefrom
WANHUA CHEMICAL GROUP CO LTD0 citations61
US11111332B2Sep 7, 2021
Isocyanate polymerization catalyst, preparation method thereof, and method for preparing polyisocyanate by using same
WANHUA CHEMICAL GROUP CO LTD0 citations60
US12304993B2May 20, 2025
Storage-stable polyisocyanate composition and preparation method
WANHUA CHEMICAL GROUP CO LTD0 citations58
US11939280B2Mar 26, 2024
Method for preparing isophorone diisocyanate
WANHUA CHEMICAL GROUP CO LTD0 citations57
US11059772B2Jul 13, 2021
Imine-type quaternary ammonium salt catalyst, preparation method thereof and use thereof for preparation of polyisocyanate composition
WANHUA CHEMICAL GROUP CO LTD0 citations56
US9701624B2Jul 11, 2017
Method for preparing biuret polyisocyanate
WANHUA CHEMICAL GROUP CO LTD1 citations49
US12024582B2Jul 2, 2024
Preparation method for polyurethane optical resin and applications thereof
WANHUA CHEMICAL GROUP CO LTD0 citations48
US11814339B2Nov 14, 2023
Method for preparing isocyanate in gaseous phase
WANHUA CHEMICAL GROUP CO LTD0 citations46
US12516191B2Jan 6, 2026
Isocyanurate-containing polyisocyanate composition with stable chromaticity, and preparation method thereof
WANHUA CHEMICAL GROUP CO LTD0 citations42
US10645756B2May 5, 2020
Heater, use thereof and method for preparing isocyanate using heater
WANHUA CHEMICAL GROUP CO LTD0 citations35