Method for the preparation of low-viscosity (poly) isocyanates

Details Method for the preparation of low-viscosity (poly) isocyanates Method for the preparation of low-viscosity (poly) isocyanates

2003-10-10

2011-10-18

Sergent, Rabon (Department: 1765)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

C252S182200, C252S182210, C252S182220, C525S123000, C525S440030, C525S455000, C528S045000, C528S067000, C528S080000, C540S202000, C548S951000, C548S952000, C560S335000, C564S038000

Reexamination Certificate

active

08039574

ABSTRACT:
A low viscosity polyisocyanate composition containing at least one isocyanate dimer having a uretidinedione unit is prepared from a reaction medium containing at least one isocyanate monomer in which the isocyanate groups are borne by sp3carbon atoms. The reaction medium is heated, in the absence of a dimerization catalyst, to a temperature of at least 50° C. and not more than 200° C. for a period of not more than 24 hours.

REFERENCES:
patent: 5461135 (1995-10-01), Malofsky et al.
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patent: 325941 (1989-08-01), None
patent: 0 481 318 (1992-04-01), None
patent: 0 615 993 (1994-09-01), None
patent: 0 780 417 (1997-06-01), None

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