Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
1992-02-28
1993-10-19
Mars, Howard T.
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
568603, 568594, 568121, C07C 43303
Patent
active
052547442
ABSTRACT:
Oligomeric formal diols are prepared by coupling segments of poly(tetramethylene ether) glycols, each having a molecular weight of 650-3000, with formaldehyde in the presence of a granular acidic catalyst, to yield poly(tetramethylene ether) formal glycols of 1,400-12,000 molecular weight.
Oligomeric formal diols of a second type can also be prepared by coupling with formaldehyde segments of poly(tetramethylene ether) glycols mixed with segments of other polymeric glycols, as for example polyethylene oxide glycol of 200 molecular weight, to yield poly(ether formal) glycols of substantially higher molecular weight than either of the starting polyether glycols, and having properties significantly different from the parent polyether glycols that may affect the performance as soft or elastomeric segments of derived polyurethanes, polyetheresters, and polyureas.
Yet a third type of oligomeric formal diols can be prepared by coupling monomeric diols, as for example 1,4-butanediol, with formaldehyde to yield higher molecular weight poly(oxybutylene formal) glycols.
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Schonfield, "Preparation and Physical Properties of a Homologous Series of Polyformal Urethanes", Journal of Polymer Science, vol. 59, pp. 87-92 (1962).
Vogel, Textbook of Practical Organic Chemistry, Logmanas et al, New York, 1951 pp. 144-145.
E. I. Du Pont de Nemours and Company
Mars Howard T.
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