Cyclic phosphazenes, process for preparing them, flame...

Details Cyclic phosphazenes, process for preparing them, flame... Cyclic phosphazenes, process for preparing them, flame...

2008-01-08

2008-01-08

Shiao, Rei-tsang (Department: 1626)

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

Synthetic resins

Processes of preparing a desired or intentional composition...

C558S075000

Reexamination Certificate

active

10479235

ABSTRACT:
The present invention relates to cyclic phosphazenes of general formula (1)wherein Q is a halogen and/or an aryloxy group, and m is an integer of 3 to 10, which are characterized by being substantially free from linear phosphazenes of general formula (2)wherein Q is a halogen and/or an aryloxy group, and n is an integer of 1 to 20 and by having an extremely low content of halogen, and which are appropriate to flame retardants for resins; processes for preparing the same; flame retardants containing the same as an active ingredient; resin compositions containing the cyclic phosphazenes; and molded articles therefrom.

REFERENCES:
patent: 5652285 (1997-07-01), Coggio et al.
patent: 11-263885 (1999-09-01), None
Fukuoka et al. 1999, CAS: 131:244114.

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