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Primary Examiner: Anderson, Harold D.
Assistant Examiner:
Attorney: Burgess, Dinklage & Sprung

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Title: Amorphous polyamide of C-alkyl substituted diamine and terephthalic acid dialkyl ester having improved electrical creep resistance

Abstract: A polyamide sheet having electrical creep resistance of quality class KA 3b according to Deutsche Industrie Norm 53,480, especially one prepared by a screw injection molding process utilizing a kneading action under a pressure of between 5 and 80 kiloponds per square centimeter at a temperature of 240.degree. to 320.degree.C utilizing a polyamide of an alkyl substituted aliphatic diamine and a lower alkyl ester of terephthalic acid.


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Inventors: Schneider, Johannes (Troisdorf, DT)
Pungs, Wolfgang (Troisdorf, DT)

Application Number: 243848
Filing Date: 1972-04-13
Publication_date: 1976-01-13
Assignee: Dynamit Nobel Aktiengesellschaft (Troisdorf, DT)
Primary Class(es): 528/347 525/184, 526/65, 528/340, 528/349
Other Classes:
US Patent Ref:
3145193Aug, 1964Gabler260/78.
3150117Sep, 1964Gabler260/78.
3198771Aug, 1965Gabler260/78.
3294758Dec, 1966Gabler260/78.
3294759Dec, 1966Gabler260/78.
3352834Nov, 1967Schmitt et al.260/78.
3449299Jun, 1969Schneider et al.260/78.
3538056Nov, 1970Caldwell260/78.
3563959Feb, 1971Schade et al.260/78.
3575935Apr, 1971Elam260/78.
3627736Dec, 1971Raum et al.260/78.
3846379Nov, 1974Schneider et al.260/78.

Other Refs: Other References: Blow Molding-Jones, 1961, pp. 68-70.
Kirk-Othmer-Encyclopedia of Chemical Technology, Vol. 16, 2nd Edition, pp. 1, 98-99.
Injection Molding Theory & Practice -Rubin, 1972, p. 396.
Thomas-Injection Molding of Plastics, 1947, pp. 282-287.