Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1977-08-12
1978-12-12
Briggs, Sr., Wilbert J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
2606065P, 528399, C08G 7902, C08G 7300
Patent
active
041295293
ABSTRACT:
The production of phosphazene polymers represented by the general formula ##STR1## WHEREIN N IS AN INTEGER FROM 7 TO UPWARDS OF 50,000 WHEREIN ONE OR MORE KINDS OF OR or OR' groups is attached to the phosphorus atoms in a substantially linear chain of alternating P and N atoms, the groups when more than one group is present being randomly distributed along the PN backbone, is enhanced by employing a single solvent for both each of the reactants (polydihalophosphazene and either aryloxide and/or alkoxide) and for the product (phosphazene polymer). By this expedient, the formation of the desired product is achieved in a homogeneous system rather than in a heterogeneous system as in the prior art where different solvents were employed for each of the reactants and for the reaction products.
REFERENCES:
patent: 3271330 (1966-09-01), Evans
patent: 3443913 (1969-05-01), Bieniek et al.
Cole William M.
Fenske Steven L.
Fieldhouse John W.
Graves Daniel F.
Stayer Mark L.
Briggs Sr. Wilbert J.
The Firestone Tire & Rubber & Company
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