公开(公告)号：US4769435A

公开(公告)日：1988-09-06

申请号：US74353

申请日：1987-07-16

申请人： Gianflavio Lunardon ,  Lino Credali ,  Ermanno Benetti ,  Carlo Mulas

发明人： Gianflavio Lunardon ,  Lino Credali ,  Ermanno Benetti ,  Carlo Mulas

IPC分类号： C08G18/08 ,  C08G18/65 ,  C08G18/30

CPC分类号： C08G18/0895 ,  C08G18/6505

摘要： The invention concerns a process for the manufacture of thermoplastic polyurethanes wherein an organic polyisocyanate is made to polymerize with a polyol (reactive with same isocyanate) in the presence of a chain extending agent having a molecular weight lower than 400, under continuous stirring, at a temperature higher than 150.degree. C. and for a time sufficient to obtain a product having a melt flow index lower than 25 g/10'.

公开(公告)号：US4880847A

公开(公告)日：1989-11-14

申请号：US75965

申请日：1987-07-21

申请人： Lino Credali ,  Carlo Mulas ,  Ermanno Benetti ,  Gianflavio Lunardon

发明人： Lino Credali ,  Carlo Mulas ,  Ermanno Benetti ,  Gianflavio Lunardon

IPC分类号： C08G18/34 ,  C08G18/10 ,  C08G18/65 ,  C08G18/80

CPC分类号： C08G18/8048 ,  C08G18/10 ,  C08G18/6541

摘要： A thermoplastic polyurethane endowed with improved heat distortion resistance, which comprises the product of reaction ofat least one polyisocyanate, preferably an organic diisocyanate;at least one polyol material reactive with the isocyanate and having a molecular weight higher than 400;a chain extender having a molecular weight lower than 400; andan aromatic anhydride having the formula (I): ##STR1## wherein A is a possibly substituted (C.sub.6 -C.sub.30) aromatic radical, m may be 0 or an integer from 1 to 3, and n is an integer equal to 1 or 2.