Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From heterocyclic reactant containing as ring atoms oxygen,...
Patent
1995-12-22
1997-01-21
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From heterocyclic reactant containing as ring atoms oxygen,...
528425, C08G 5900, C08G 6534
Patent
active
055960740
ABSTRACT:
A process for removing precursors, such as low boiling alkyl glycols (e.g., ethylene glycol and/or 1,2-propylene glycol), to undersirable color forming acetal impurities (e.g., 1,3 -dioxolane and 4-methyl-1,3-dioxolane) from technical grade 1,4-butanediol/2-methyl-1,4-butanediol mixtures and the like by distillative topping of the diol mixture prior to ring closing cyclization to corresponding tetrahydrofuran/3-methyl tetrahydrofuran mixture and subsequent polymerization to polytetramethylene glycol ether polymers. Such a process is useful to produce THF and PTMEG having a APHA color index of nearly zero.
REFERENCES:
patent: 2870097 (1959-01-01), Pattison
patent: 3726405 (1973-04-01), Engelbrecht et al.
patent: 3852164 (1974-12-01), Chew et al.
patent: 4093633 (1978-06-01), Tanabe et al.
patent: 4257961 (1981-03-01), Coates
patent: 4383895 (1983-05-01), Ernst et al.
patent: 4419189 (1983-12-01), Caracciolo
patent: 4480124 (1984-10-01), Mueller
patent: 4590285 (1986-05-01), Ernst
patent: 4590312 (1986-05-01), Ernst
patent: 4940758 (1990-07-01), Wong
patent: 5008408 (1991-04-01), Fischer et al.
patent: 5112943 (1992-05-01), Mueller
patent: 5209825 (1993-05-01), Badat et al.
patent: 5288841 (1994-02-01), Bellis et al.
patent: 5340916 (1994-08-01), Henn et al.
Hill and Carothers, Cyclic And Polymeric Formals, J Am Chem Soc, 57, 925-928, 1935.
Bloxham Peter A.
Breikss Anne I.
Ernst Richard E.
Scott Leon S.
Super John D.
E. I. Du Pont de Nemours and Company
Foelak Morton
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