Process for the manufacture of open-pore shaped articles of poly

Details Process for the manufacture of open-pore shaped articles of poly Process for the manufacture of open-pore shaped articles of poly

1975-03-05

1978-04-11

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By treating occluded solids

260 25M, B29D 2704

Patent

active

040839060

ABSTRACT:
Starch products which were hitherto used as pore-forming substances in the manufacture of polyvinyl alcohol acetal sponges are replaced by polyethylene glycol or polyacrylamide. This results in a more uniform distribution of pore size, lower shrinkage of the sponge material during the acetalization, and easier washing of the sponge after the acetalization.

REFERENCES:
patent: 2609347 (1952-09-01), Wilson
patent: 2668153 (1953-01-01), Hammon
patent: 2825747 (1958-03-01), Rogers
patent: 3276996 (1966-10-01), Lazare
patent: 3663470 (1972-05-01), Nishimura et al.
"Molecular Weight Relations of Poly(ethylene Oxide)", by Bailey, F. E.; J. L. Kucera; and L. G. Imhof, in Journal of Polymer Science, Letters to the Editors, vol. XXXII, issue No. 125 (1958), pp. 517 and 518.
Scholtan, von W. "Molekulargewichtshestimmung von Polyacrylamid Mittels der Ultrazentrifuge", in Makromolekulare Chemie. vol. 14 (1954), pp. 169-178.
Bernhardt, Ernest C., Edt. "Processing of Themoplastic Materials", New York, Reinhold, c1959, p. 600.

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