Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1978-02-08
1980-01-29
Lieberman, Allan
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
528 52, 525453, 525457, C08L 7502, C08L 7504
Patent
active
041861183
ABSTRACT:
A process for preparing modified aqueous synthetic resin dispersions, comprising introducing organic diisocyanates which are liquid at room temperature into polyurethane-containing, non-sedimenting, aqueous synthetic resin dispersions, optionally in the presence of catalysts which accelerate the isocyanate polyaddition reaction and/or the dimerization of isocyanate groups and/or the carbodiimidization of isocyanate groups and/or the trimerization of isocyanate groups, mixing the organic diisocyanate with the aqueous dispersion at a temperature at which no visible foaming occurs, maintaining the temperature after addition of all the diisocyanate until at least 50% of the isocyanate groups in the added diisocyanate have undergone reaction and, if desired, completing the reaction by subsequently heating to temperatures up to 100.degree. C.
These modified aqueous dispersions contain dispersed latex particles which are enveloped with polyurea formed from the diisocyanates. These modified dispersions are useful as water-resistant surface coatings and leather dressings which are abrasion resistant in the wet.
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Journal of the Oil and Color Chemists Association, 53, Jan. 1970, pp. 363-379.
Angewandte Chemie, 82, 1970, pp. 53-63.
Die Angewandte Makromolekulare Chemie, 26, 1972, pp. 85-106.
Advan. Urethane Sci. Technol., 4, 1976, pp. 112-131.
Dieterich Dieter
Reischl Artur
Wenzel Wolfgang
Bayer Aktiengesellschaft
Gil Joseph C.
Harsh Gene
Lieberman Allan
Olson R. Brent
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