Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Patent
1994-02-17
1995-07-04
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
528 56, 528 58, C08G 1808, C08G 1822
Patent
active
054301220
ABSTRACT:
Poly(ether-urethanes) can be made from cyclic ethers and organic isocyanates by using selected metal compounds as catalysts. Polymers useful as thermoplastic elastomers, spandex fibers or urethane rubbers can be made by reacting diisocyanates containing functional groups with a tetrahydrofuran, especially tetrahydrofuran itself.
REFERENCES:
patent: 3842019 (1974-10-01), Kropp
patent: 5084586 (1992-01-01), Farooq
patent: 5124417 (1992-06-01), Farooq
Pending U.S. Ser. No. 08/283,108 filed Jul. 29, 1994 pending in Group Art Unit 1505.
Hrkach, J. S. et al., "Cationic Polymerization of Tetrahydrofuran Initiated by Trimethylsilyl Trifluoromethanesulfonate", Macromolecules, 23, 4042-4046, 1990.
Olah, G. A., et al., "Cationic Ring-Opening Polymerization of Tetrahydrofuran with Boron, Aluminum, and Gallium Tristriflate", Journal of Applied Polymer Science, 45, 1355-1360, 1992.
E. I. Du Pont de Nemours and Company
Foelak Morton
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