Method for masking polyisocyanates in emulsion

Details Method for masking polyisocyanates in emulsion Method for masking polyisocyanates in emulsion

2005-02-22

2005-02-22

Niland, Patrick D. (Department: 1714)

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...

C422S129000, C422S132000, C422S134000, C422S135000, C427S372200, C427S385500, C428S423100, C523S223000, C523S322000, C523S323000, C523S333000, C523S334000, C524S589000, C524S590000, C524S839000, C524S840000, C528S045000

Reexamination Certificate

active

06858668

ABSTRACT:
This invention relates to a process for the preparation of aqueous emulsions of blocked (poly)isocyanates, this process comprising the steps consisting successively in:a) placing an isocyanate composition containing free isocyanate functions in contact with at least one blocking agent A in the presence of a surfactant B and an aqueous phase, the said isocyanate composition being added gradually to a stock containing at least some of the aqueous phase and at least some of the blocking agent;and optionally,b) subjecting the mixture obtained to a shear (speed gradient) of greater than 1000 s−1, preferably greater than 20,000 s−1and less than 1,000,000 s−1, preferably less than 200,000 s−1, andc) repeating step b), optionally after step a) has been repeated, until a stable emulsion is obtained whose particles have a Sauter diameter of greater than 0.1 μm, preferably 0.2 μm, and less than 5 μm, preferably less than 2 μm, and a dispersion width of less than 5 μm.

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