Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1987-04-14
1988-05-17
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C08L 7504
Patent
active
047451513
ABSTRACT:
The present invention is directed to a process for the production of aqueous polyurethane-polyurea dispersions by reacting NCO-prepolymers having an average NCO-functionality of 2 to 2.3 and an average molecular weight of about 700 to about 5000 with organic polyamines having an average amine functionality of 2.05 to about 3 and an average molecular weight of 60 to about 2000 containing primary and/or secondary amino groups at an NCO/NH ratio about 1.05:1 to about 7:1 in the presence of a water-miscible, weakly polar solvent inert to isocyanate groups and having a boiling point at normal pressure below 100.degree. C., converting the resulting solution of the reaction products into an aqueous dispersion by the addition of water and optionally removing the solvent used by distillation, characterized in that the reactants and amounts used are selected such that the resulting reaction products have an NCO-functionality of 2.2 to about 3 and NCO-content of about 0.1 to 5% by weight. The present invention is also directed to the products of this process and their use for the production of coatings.
REFERENCES:
patent: 3870684 (1975-03-01), Witt et al.
patent: 4036801 (1977-07-01), Matsuda
patent: 4066591 (1978-01-01), Sciven et al.
patent: 4203883 (1980-05-01), Hangauer, Jr.
patent: 4292226 (1981-09-01), Wenzel
patent: 4408008 (1983-10-01), Markusch
patent: 4558090 (1985-12-01), Drexler
patent: 4622360 (1986-11-01), Gomi
Mosbach Jurgen
Nachtkamp Klaus
Noll Klaus
Pedain Josef
Schwindt Jurgen
Bayer Aktiengesellschaft
Gil Joseph C.
Harsh Gene
Michl Paul R.
Roy Thomas W.
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