Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1980-09-02
1982-01-19
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
422133, 521 82, 521136, 521158, 521917, C08J 900
Patent
active
043118020
ABSTRACT:
A continuous process for the production of flame-resistant foamed plastics material by condensation of aqueous aminoplast precondensates with diisocyanates or polyisocyanates, wherein, in a first mixing stage, the isocyanate is mixed with 4 to 14% by weight of catalyst, the catalyst being an organic amine and/or an organic metal compound, at temperatures of 40.degree. to 130.degree. C., with a residence time of 1 to 8 seconds, and directly thereafter, in a second mixing stage, the aminoplast precondensate and, simultaneously but separately from the aminoplast, an acid curing catalyst are introduced, after which the foamable mixture thereby produced is discharged continuously. The apparatus for performing this process comprises two mixing chambers connected in series, the first mixing chamber being coolable and the mixing chambers being connected via a nozzle, the ratio of the cross-section on the narrowest point of the nozzle to the sum of the cross-sections of the feed lines supplying the first mixing chamber being 0.3:1 to 0.9:1.
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Golser Leopold
Woisetschlager Helmut
Chemie Linz Aktiengesellschaft
Foelak Morton
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