Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1977-02-28
1978-11-14
Ivy, C. Warren
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
260 326NR, 521159, 521163, 528 61, C08G 1810, C08G 1832, C08G 1882, C08J 928
Patent
active
041256930
ABSTRACT:
Process for the production of polyurethanes dissolved in a solvent by mixing linear pre-adducts having terminal NCO groups dissolved in solvents with hydrazines and/or dihydrazine compounds and or diamines dissolved in solvents, for the purpose of forming partially cross-linked polyurethanes, whilst continuously measuring the viscosity until the viscosity shows a value which is located in the shaded zone of the section of curves shown in FIG. 1, the addition of the pre-adduct solution being carried out at such a speed that the final solution has solids content of between 25 and 35 per cent by weight, and coagulation of the obtained solution to fabricated shapes, especially to microporous sheet structures.
REFERENCES:
patent: 3577388 (1971-05-01), Megna
patent: 3631138 (1971-12-01), Peters
patent: 3639652 (1972-02-01), Mommaerts
patent: 3640937 (1972-02-01), Thoma
patent: 3715326 (1973-02-01), Traubel
patent: 3726836 (1973-04-01), Nakahara
patent: 3733310 (1973-05-01), Aitken
Chemie-Anlagenbau Bischofsheim GmbH
Ivy C. Warren
Metallgesellschaft AG
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