A method for producing a polyurethane prepolymer having terminal isocyanate groups is provided wherein one or more polyisocyanates are reacted with one or more polyols and wherein at least one asymmetric diisocyanate, at least one polyol having an average molecular weight (M
n
) of 60 to 3000 g/mol, and at least one carboxamide catalyst are used. The ratio of isocyanate groups to hydroxyl groups is set in the range between 1.1:1 to 4:1.
提供了一种生产具有末端异氰酸酯基团的聚氨酯预聚物的方法,其中一种或多种多异氰酸酯与一种或多种多元醇反应,至少一种不对称二异氰酸酯、至少一种平均分子量(M
n
)的至少一种多元醇和至少一种羧酰胺催化剂。异氰酸酯基团与羟基基团的比例设定在 1.1:1 至 4:1 之间。
VERFAHREN ZUR HERSTELLUNG VON POLYURETHAN-PREPOLYMEREN IN GEGENWART EINES KATALYSATORS
申请人:Henkel Kommanditgesellschaft auf Aktien
公开号:EP1572772A1
公开(公告)日:2005-09-14
BLOCKED ISOCYANATE TERMINATED PREPOLYMERS WITH IMPROVED PROCESSING PROPERTIES
申请人:LANXESS Solutions US Inc.
公开号:US20180148534A1
公开(公告)日:2018-05-31
Blocked isocyanate terminated prepolymers with improved handling and processing properties are prepared from isocyanate terminated prepolymers with very low free isocyanate monomer content. The blocked prepolymers have lower melting points and/or viscosities compared to similar blocked isocyanate terminated having traditional, higher amounts of free isocyanate monomer. Curing compositions comprising the blocked prepolymers are prepared and cured to form polyurethane polymers with excellent properties.