Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From ketone or ketene reactant
Patent
1990-06-27
1993-11-23
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From ketone or ketene reactant
528125, 528126, 528128, 528167, 528170, 528171, 528174, 528175, 528206, 528220, 548417, 548418, 548419, 548423, 549 11, 549 12, 549349, 549354, C08G 200, C08G 7500
Patent
active
052645380
ABSTRACT:
Cyclic poly(aryl ether) oligomers and mixtures thereof, and methods for the preparation thereof in a highly dilute reaction medium under reaction conditions favorable for ring closure at low degrees of polymerization. These oligomers are represented by the general formula ##STR1## where each Y is divalent oxygen or divalent sulfur, each Ar is an aromatic diradical which comprises one or more C.sub.6 to C.sub.20 arylene groups and has at least one electron withdrawing group attached to an aromatic ring, and n is an integer from 1 to about 20 with the proviso that for integer values of n equal to 1 or 2 all linkages between independent aromatic rings comprise at least one atom.
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patent: 5110893 (1992-05-01), Fukuyama
Cella et al., Ring Opening Polymerization of Cyclic Ethers & Thioethers, Amides, Sulfones via aromatic ether--ether exchange; Amer. Chem. Soc. Polymer Prep., vol. 30, No. 2 (1989), pp. 142-143.
Cella, et al., Poly. Prepr.30(2), 581-582, (Sep. 1989).
Balon Kimberly E.
Chen Cheng-Cheng C.
Mullins Michael J.
Murray Daniel J.
Woo Edmund P.
Deline Douglas N.
Hampton-Hightower P.
Kight III John
The Dow Chemical Company
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