Tris-tetrazoles as chemical blowing agents

Details Tris-tetrazoles as chemical blowing agents Tris-tetrazoles as chemical blowing agents

1977-10-05

1978-11-28

Ford, John M.

Organic compounds -- part of the class 532-570 series

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

521 90, 521180, C07D25104

Patent

active

041277180

ABSTRACT:
Tris-tetrazoles of formula I, ##STR1## wherein A is alkylene and R is hydrogen, alkyl or phenyl, are suitable blowing agents for thermoplastic resins, especially for polycarbonates and aromatic polyethers. The foaming process can be carried out at a temperature range of 230 to 300.degree. C, the resulting foamed articles have a fine and homogenous cellular structure.
The tris-tetrazoles I can be sythesized from the corresponding tris-nitriles or tris-imidchlorides by reaction with an alkali azide.

REFERENCES:
patent: 3442829 (1969-05-01), Moore et al.

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