Title:
PRODUCTION OF THERMOPLASTIC POLYURETHANE
Document Type and Number:
Japanese Patent JP3139687
Kind Code:
B2
Abstract:
PURPOSE: To continuously obtain the subject high-quality polymer with hardly any foreign materials by prepolymerizing a polyfunctional polymer compound with a polyfunctional organic isocyanate in two stages of dynamic and static stirring, preparing a prepolymer and then reacting the resultant product with a polyfunctional low-molecular compound in an extruder.
CONSTITUTION: A prepolymer is obtained by carrying out a reactional step in the first stage comprising the operation to make (A) a polyfunctional polymer compound, containing active hydrogen atom in the molecule and having ≥500 molecular weight react with (B) a polyfunctional isocyanate under conditions of stirring with dynamic stirring blades until 20-90mol% active hydrogen atom is consumed and obtain a reactional mixture and performing a reactional step in the second stage comprising the operation to allow the resultant reactional mixture to react under kneading conditions with a static stirrer until ≥10mol% active hydrogen is consumed and the residual ratio of the active hydrogen attains ≤40mol% and thereby produce the prepolymer. The prepared prepolymer is then made to react with (C) a polyfunctional low-molecular compound, containing active hydrogen atom in the molecule and having <500 molecular weight to continuously afford the objective thermoplastic polyurethane.
Inventors:
Shinya Kato
Hiroyuki Ono
Setsuo Yamashita
Hiroyuki Ono
Setsuo Yamashita
Application Number:
JP9719692A
Publication Date:
March 05, 2001
Filing Date:
March 23, 1992
Export Citation:
Assignee:
KURARAY CO.,LTD.
International Classes:
C08G18/10; (IPC1-7): C08G18/10
Domestic Patent References:
| JP6487306A | ||||
| JP5610517A | ||||
| JP1210413A | ||||
| JP50123797A | ||||
| JP51119094A | ||||
| JP4222716B1 | ||||
| JP4912597B1 |