Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1979-03-02
1981-05-26
Pertilla, Theodore E.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 294R, 4284231, C08L 7512
Patent
active
042697484
ABSTRACT:
The present invention relates to a process for the preparation of aqueous solutions or dispersions of polyurethanes, in which process prepolymers which have at least two free isocyanate groups and contain chemically-fixed hydrophilic groups and/or external emulsifiers which are not chemically fixed are reacted with chain lengthening agents in the aqueous phase, characterized in that the isocyanate prepolymer which is hydrophilically modified and/or contains an external emulsifier is mixed with chain lengthening agents selected from the group consisting of azines and hydrazones in the absence of water and the mixture obtained is then mixed with water. The present invention also relates to the dispersions or solutions which can be obtained by this process. Lastly, this invention relates to the use of the dispersions or solutions which can be obtained by this process for coating flexible substrates.
REFERENCES:
patent: 3420800 (1969-01-01), Haggis
patent: 4066591 (1978-01-01), Scriven et al.
Grammel Jurgen
Nachtkamp Klaus
Pedain Josef
Bayer Aktiengesellschaft
Harsh Gene
Pertilla Theodore E.
Pope Lawrence S.
Roy Thomas W.
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