Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phosphorus-containing reactant
Reexamination Certificate
2007-11-13
2007-11-13
Kopec, Mark (Department: 1751)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phosphorus-containing reactant
C521S025000, C521S033000
Reexamination Certificate
active
10893187
ABSTRACT:
A polyphosphazene derivative and an aromatic ring compound are bonded to one another to obtain an intermediate product. Subsequently, anhydrous sulfuric acid is added in such an amount that the molar ratio is 2 to 8 with respect to a repeating unit of the intermediate product. Further, SO3and the intermediate product are reacted with each other to sulfonate the intermediate product. The sulfonation is performed under a condition in which the temperature range is −20 to 0° C. and the total time is 5 to 30 hours. Accordingly, a sulfonated polyphosphazene derivative is obtained, in which the number average molecular weight is not less than 25,000 and the ion exchange capacity exceeds 3.0 mmol/g.
REFERENCES:
patent: 5548060 (1996-08-01), Allcock et al.
patent: 6365294 (2002-04-01), Pintauro et al.
Tang et al “Polyphosphazene Membranes. IV. Polymer Morphology and Proton Conductivity in Sulfonated Poly[bis(3-methylphenoxy)phosphazine]Films”, Journal of Applied Polymer Scinces, 79(1), pp. 49-59.
“Evaluation of methanol crossover in proton-conducting polyphosphazene membranes”, Material Letters, Jan. 2002, vol. 52, pp. 192-196.
“Sulfonated Polyphosphazene ion-exchange membranes”, Journal of Membrane Science 1996, vol. 119, pp. 155-160.
Honda Motor Co. Ltd.
Kopec Mark
Lahive & Cockfield LLP
Laurentano, Esq. Anthony A.
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