-
公开(公告)号：US20220024863A1
公开(公告)日：2022-01-27
申请号：US17295806
申请日：2018-12-26
发明人： Weiqi HUA , Tonghe LI , Yonghua SHANG , Shuchang SUN , Jingxu WANG , Jinping HAN , Qiang LI , Wenbin LI , Jing LI , Pengfei WANG , Yuan LI
IPC分类号： C07C263/10
摘要： A method for preparing an isocyanate in a gaseous phase by feeding, in the presence or absence of an inert gas, an amine-containing gas stream and a phosgene-containing gas stream into a reaction region, allowing the amine and the phosgene to contact in gaseous forms and undergo a phosgenation reaction in the reaction region, thus preparing the target isocyanate in a gaseous form in the reaction region. The phosgene-containing stream is subjected to preheating and warming before being fed into the reaction region, and the phosgene-containing stream comprises a substance A at a mass fraction of
-
公开(公告)号：US20240166795A1
公开(公告)日：2024-05-23
申请号：US18281208
申请日：2022-03-10
发明人： Fulin ZHU , Yonghua SHANG , Jianfeng LI , Weijie LIU , Peng WANG , Wenbin LI , Pengfei WANG , Qian WU , Wei LIU , Yuan LI
IPC分类号： C08G18/71 , C07C263/10 , C08G18/38 , C08G18/76 , C09D175/04
CPC分类号： C08G18/711 , C07C263/10 , C08G18/3876 , C08G18/7642 , C09D175/04 , F21V1/22
摘要： A xylylene diisocynate composition, a preparation method therefor and the use thereof. The xylylene diisocynate composition includes xylylene diisocynate and 0.2-500 ppm of a compound represented by formula (1). A resin prepared from the provided xylylene diisocynate composition has an excellent discoloration resistance and can effectively inhibit yellowing and/or white turbidity thereof.
-
公开(公告)号：US20220402865A1
公开(公告)日：2022-12-22
申请号：US17772352
申请日：2020-07-07
发明人： Fulin ZHU , Jianfeng LI , Peng WANG , Wenbin LI , Jie CHEN , Qiao WANG , Qian WU , Hao CHEN , Yonghua SHANG , Yuan LI
IPC分类号： C07C265/14 , C08G18/75 , G02B1/04 , C08G18/38
摘要： Disclosed is a 1,3-bisisocyanatomethylcyclohexane composition and an optical resin prepared therefrom. The composition comprises, based on the weight of 1,3-bisisocyanatomethylcyclohexane, a) 65%-95 wt % of trans-1,3-bisisocyanatomethylcyclohexane; b) greater than 0 and less than or equal to 0.5 wt %, preferably 0.02-0.5 wt % of 1,4-bisisocyanatomethylcyclohexane. Preferably, the 1,3-bisisocyanatomethylcyclohexane composition contains greater than 0 and less than or equal to 600 ppm of 1-isocyanatomethyl-3-methylcyclohexane, based on the weight of 1,3-bisisocyanatomethylcyclohexane. The 1,3-bisisocyanatomethylcyclohexane composition is used for preparing an optical resin, which can be applied to produce an optical lens with a better performance in preventing opacification and optical distortion.
-
公开(公告)号：US20220002235A1
公开(公告)日：2022-01-06
申请号：US17295369
申请日：2018-12-25
发明人： Yong YU , Yonghua SHANG , Lei ZHAO , Wenbin LI , Ye SUN , Wei HE , Xuelei CUI , Jingxu WANG , Degang LIU , Yuan LI
IPC分类号： C07C263/10 , C07C253/10 , C07C209/48 , B01J25/00
摘要： A method for preparing isophorone diisocyanate by (1) reacting isophorone with hydrogen cyanide in the presence of a catalyst to obtain isophorone nitrile; (2) reacting the isophorone nitrile obtained in step (1) with ammonia gas and hydrogen in the presence of a catalyst to obtain isophorone diamine; and (3) subjecting the isophorone diamine to a phosgenation reaction to obtain the isophorone diisocyanate, wherein the content of impurities containing a secondary amine group in the isophorone diamine that undergoes the phosgenation reaction in step (3) is ≤0.5 wt. The method reduces the content of hydrolyzed chlorine in the isophorone diisocyanate product, improves the yellowing resistance of the product, and the harm due to presence of hydrolyzed chlorine in the product is reduced.
-
-
-
搜索结果
4 条记录 (耗时 0.018 秒)
