Bis-tetrazoles as chemical blowing agents for foaming thermoplas

Details Bis-tetrazoles as chemical blowing agents for foaming thermoplas Bis-tetrazoles as chemical blowing agents for foaming thermoplas

1977-07-12

1979-02-27

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

260308D, 521142, 521146, 521147, 521149, 521180, 521182, 521189, C08J 910

Patent

active

041420292

ABSTRACT:
Bis-tetrazoles wherein the two tetrazole rings are bridged by a direct bond or a divalent organic residue in 5,5'-position or in 1,1'-position have been found to be suitable as blowing agents for thermoplastic resins. They decompose at temperatures of about 230 to 300.degree. C. and therefore can be used for the expansion of resins which are processed at such temperatures, for instance polypropylene, polycarbonates, polyphenyleneoxides or polyamides. Preferred are bis-tetrazoles bridges by aliphatic or araliphatic residues. The expansion can be carried out in an extruder or an injection moulding device.

REFERENCES:
patent: 3442829 (1969-05-01), Moore et al.
patent: 3615616 (1971-10-01), Williams et al.
patent: 3873477 (1975-03-01), Beck et al.

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