Preparation of thermoplastic polyurethanes

Details Preparation of thermoplastic polyurethanes Preparation of thermoplastic polyurethanes

1995-10-12

1997-04-15

Gorr, Rachel

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

528 44, 26421123, 26421124, C08G 1808

Patent

active

056210248

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.

REFERENCES:
patent: 3963679 (1976-06-01), Ullrich et al.
patent: 4250292 (1981-02-01), Niederdellmann et al.
patent: 5391682 (1995-02-01), Ogawa
EPO Search Report dated Jun. 3, 1996; Translation of EPO Search Report.

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