Process for the continuous production of thermoplastic polyureth

Details Process for the continuous production of thermoplastic polyureth Process for the continuous production of thermoplastic polyureth

1995-02-21

1996-10-22

Seidleck, James J.

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

Synthetic resins

From reactant having at least one -n=c=x group as well as...

2641761, 528 44, 528 53, 528 54, 528 55, 528 56, 528 58, 528 76, 528 80, 528 83, 528 85, C08G 1816, C08G 1818, C08G 1822, C08G 1824

Patent

active

055677916

ABSTRACT:
A method whereby the properties, particularly the recrystallisation temperature, of thermoplastic polyurethane elastomers, particularly those suitable for processing by extrusion, are kept constant during continuous manufacture in screw-type extruding machines by continuously adding substantially straight-chain hydroxyl-terminated polyols having a molecular weight of 500 to 5000, organic diisoicyanates and diol and optionally triol chain-lengthening agents having a molecular weight of 62 to 500, the molar ratio of polyols to chain-lengthening agents being 1:1 to 1:5, and by continuous addition of a catalyst, wherein the recrystallisation temperature is set at a value at least 2.degree. C. below the value for the corresponding TPU manufactured without a catalyst, and when the set recrystallisation temperature is exceeded, the amount of continuously supplied catalyst is increased, whereas when the value falls below, the amount is decreased so as to maintain the set value, the resulting elastomers and use thereof for extrusion.

REFERENCES:
patent: 3642964 (1972-02-01), Rausch, Jr. et al.
patent: 4169196 (1979-09-01), Ehrlich et al.
patent: 4245081 (1981-01-01), Quiring et al.
Smith et al.; Principles and Practice of Automatic Process Control; John Wiley and Sons; New York; 1985, pp. 1-9.
Encyclopedia of Polymer Science and Engineering; Supplement Volume; John Wiley and Sons; New York; 1989; pp. 231-241.
Mark et al.; Physical Properties of Polymers, Second Edition; American Chemical Society; Washington, D.C.; 1993; pp. 168-169.
Schollenberger et al., "Thermoplastic Polyurethane Elastomer Molecular Weight-Property Relations, Further Studies"; Advances in Urethane Science and Technology; vol. 7; Technomic Publishing Co.; Westport, CT, (date unknown).

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