Process for the preparation of blocked polyisocyanates, and thei

Details Process for the preparation of blocked polyisocyanates, and thei Process for the preparation of blocked polyisocyanates, and thei

1994-11-30

1996-07-30

Hamilton, III, Thomas

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...

560330, C08G 1880

Patent

active

055412793

ABSTRACT:
The invention relates to a process for the preparation of totally or partially blocked polyisocyanates based on a blocking agent and on a polyisocyanate containing at least two free NCO groups, if desired in the presence of a chain extender, in which the totally or partially blocked polyisocyanates are prepared by a solvent-free and continuous procedure. This reaction is carried out in a static mixer or intensive kneading apparatus or extruder. The invention furthermore relates to the use of the totally or partially blocked polyisocyanates for PUR powder coatings and solvent-containing, one-component PUR stoving enamels.

REFERENCES:
patent: 3846378 (1974-11-01), Griswold
patent: 4055550 (1977-10-01), Panandiker et al.
patent: 4055551 (1977-10-01), Panandiker et al.
patent: 4722969 (1988-02-01), Huynh-Tran et al.
patent: 4868298 (1989-09-01), Brinkman
patent: 5149805 (1992-09-01), Gras et al.
patent: 5284918 (1994-02-01), Huynh-Tran et al.
patent: 5331078 (1994-07-01), Gras et al.

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