Sulphonyltetrazoles as chemical blowing agents

Details Sulphonyltetrazoles as chemical blowing agents Sulphonyltetrazoles as chemical blowing agents

1977-10-28

1978-11-21

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521180, 521182, 521143, C08J 910

Patent

active

041265904

ABSTRACT:
Sulfonyltetrazoles of formula I, ##STR1## wherein n is 1 or 2, A is alkylene and R is a mono- or divalent hydrocarbon residue, are usable as blowing agents for thermoplastic polymers. These compounds decompose at temperatures above 200.degree. C, therefore they can be used preferably for foaming thermoplasts of higher softening temperature such as aromatic polycarbonates, polyesters or polyethers.

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

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