Preparation of thermoplastic polyurethanes
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 15, 1997
Grant Date -
N/A
app pub date -
Oct 12, 1995
filing date -
Oct 20, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to a process for the preparation of thermoplastic polyurethane by reacting a) organic and/or modified organic polyisocyanates with b) at least one oligomeric polyhydroxy and/or polyamino compound having an average molecular weight of from 400 to 10,000 g/mol, in the presence or absence of c) chain extenders having at least two Zerewitinoff-active hydrogen atoms and an average molecular weight of less than 400 g/mol, d) catalysts, e) compounds which are less than difunctional with respect to isocyanates and/or isocyanates which are less than difunctional and, f) assistants and/or additives, in a twin-screw extruder in which both screws rotate in the same direction and which has a length of/diameter ratio of from 20 to 6 and discharging the resulting thermoplastic polyurethane from the extruder with shaping.
First Claim
Other Claims data not available