公开(公告)号：US3903127A

公开(公告)日：1975-09-02

申请号：US44177874

申请日：1974-02-12

Applicant: BAYER AG

Inventor： WAGNER KUNO ,  EIMER JOHANNES ,  ZIRNER JOACHIM ,  RAAB RAINER ,  LIEBSCH DIETRICH

IPC: C08G18/00 ,  C07C67/00 ,  C07C239/00 ,  C07C273/18 ,  C07C275/62 ,  C08G18/78 ,  C07C118/00 ,  C07C119/042

CPC classification number: C07C273/1863 ,  C07C273/1872 ,  C08G18/7831 ,  C07C275/62

Abstract: Comparatively low viscosity biuret containing polyisocyanates are produced by reacting diisocyanates and biuretizing agents in proportions corresponding to a molar ratio of diisocyanate to monofunctional biuretizing agent of at least 11 : 1.

公开(公告)号：US3897314A

公开(公告)日：1975-07-29

申请号：US44042574

申请日：1974-02-07

Applicant: BAYER AG

Inventor： LIEBSCH DIETRICH ,  BECHER DIETER ,  KRESS RUDOLF ,  SAUER HEINZ

IPC: B01D3/00 ,  C07C263/10

CPC classification number: C07C263/20 ,  C07C265/14

Abstract: A process is provided for separating residue from isocyanate concentrates produced by the phosgenation of organic amines. The isocyanate concentrate is passed under high vacuum through a system of downpipe evaporators and cyclone separators a portion of the liquid residue from the separator being recycled to the inlet of the evaporator along with the concentrate feed.

Abstract translation: 提供了通过有机胺光气化产生的异氰酸酯浓缩物分离残留物的方法。 异氰酸酯浓缩物通过降压蒸发器和旋风分离器的系统在高真空下通过，来自分离器的液体残余物的一部分与浓缩物进料一起被再循环到蒸发器的入口。

公开(公告)号：US3645979A

公开(公告)日：1972-02-29

申请号：US3645979D

申请日：1967-01-25

Applicant: BAYER AG

Inventor： LIEBSCH DIETRICH ,  ALTNER WILHELM

IPC: C07D251/34 ,  B41L11/00 ,  C08G18/00 ,  C08G18/02 ,  C08G18/79 ,  C08G22/04 ,  C07D55/38 ,  C08G22/26

CPC classification number: C08G18/795 ,  B41L11/00 ,  B41P2700/10 ,  C08G18/022 ,  Y10S521/902 ,  Y10S528/905

Abstract: A METHOD FOR PREPARING POLYISOCYANATES HAVING AT LEAST ONE ISOCYANURATE RING WHICH COMPRISES POLYMERIZING AN AROMATIC AND AN ALPHATIC OR ARALIPHATIC POLYISOCYANATE IN THE PRESENCE OF AN ORGANIC PHOSPHINE, THE ALIPHATIC OR ARALIPHATIC POLYISOCYANATE BEING PRESENT IN SUCH AN AMOUNT THAT MORE THAN ABOUT 0.5 ALIPHATICALLY BOUND -NCO GROUP IS PRESENT PER AROMATICALLY BOUND-NCO GROUP, PREFERABLY 0.5 TO 10. THE PRODUCTS PER SE HAVE UTILITY AS ADHESIVES, LACQUERS, CASTING RESINS, AND FOAMS, AND ALSO AS THE ISOCYANATE COMPONENT IN OTHER REACTIVE SYSTEMS.