Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1976-04-07
1977-08-02
Cockeram, H.S.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 775AA, C08G 1808
Patent
active
040395162
ABSTRACT:
This invention relates to an improved process for the production of high molecular weight polyurethanes which are free from isocyanate groups and are soluble in organic solvent in reduced reaction times. The reactants, polyol and isocyanate, for example, are mixed together with solvent and the temperature is permitted to rise under the effect of the heat of reaction. The reaction mixture is then cooled with solvent addition in such a way that the viscosity of the reaction mixture remains constant until the optimum temperature for the polyurethane formation reaction ("specific reaction temperature") is reached. The mixture is then gradually cooled until there is no residual isocyanate present and the polymer is recovered from the reaction mixture.
REFERENCES:
patent: 3415790 (1968-12-01), Davis et al.
patent: 3639652 (1972-02-01), Mommaerts et al.
patent: 3642964 (1972-02-01), Rausch et al.
patent: 3817933 (1974-06-01), Niederdellmann et al.
patent: 3915923 (1975-10-01), Ward
patent: 3948847 (1976-04-01), Aitken et al.
D.O.S. 2,149,836 (Niederdellmann et al.) Apr., 1973 pp. 1-20.
Conrad Horst
Klussmann Henning
Niederdellmann Georg
Bayer Aktiengesellschaft
Cockeram H.S.
Colen Frederick H.
Harsh Gene
Pope Lawrence S.
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