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Title: Process for making electrical insulating paper and the product thereof

Abstract: The invention relates to a method for improving the thermal stability and dielectric integrity of a cellulosic web product. The cellulosic web is impregnated with a nitrogen donor compound such that the web contains not less than 0.2% by weight of the compound and thereafter impregnated with an aqueous vegetable protein solution at a pH of not less than about 8.5.


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Inventors: Sadler, Fred S. (St. Jessup, PA)
Hettwer, Paul F. (Franksville, WI)
Viet, Vu H. (Franksville, WI)
Acker, Clarance R. (Zanesville, OH)

Application Number: 06/365523
Filing Date: 1982-04-05
Publication_date: 1983-10-04
Assignee: MC GRAW EDISON CO (US)

Primary Class(es): 162/137 427/121, 162/158, 162/174, 428/479.600, 427/414, 162/
Other Classes: D21H17/22; D21H17/50; H01B3/52; D21H17/00; H01B3/18; H05K5/00; D21H1/48
US Patent Ref:
2339707January, 1944Kress et al.106/142Method for coating paper
3119732January, 1964Robertson et al.162/174Method of treating cellulosic fibers with a cationic protein dispersion
3135627June, 1964Sadler162/138Thermally stabilized cellulose materials for electrical insulation
3166466January, 1965Puydak162/174Fibrous cellulosic products
3211516October, 1965Sadler162/158Thermally stabilized cellulose materials
3224902December, 1965Sadler et al.162/138Thermally stabilized cellulose materials
3328184June, 1967Weber106/130Printing paper having opaque cellular coating and method and composition for forming the same
3736178May, 1973Sadler et al.162/138
3903352September, 1975Suter et al.174/110PCoated electrical insulating paper and method of making it
3931027January, 1976Sadler et al.162/138Cellulose material treated with a thermosetting resin and having improved physical properties at ele
4196044April, 1980Mussoni et al.162/138Product and process for making a creped and calendered cellulosic electrical paper

Other Refs:
Primary Examiner: Chin, Peter
Assistant Examiner:
Attorney: Gealow J. C.
Gabala J. A.
Jonathan P.
Claims: