Transparent polyamides from branched chain diamines

Details Transparent polyamides from branched chain diamines Transparent polyamides from branched chain diamines

1978-10-26

1980-07-01

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

428474, 260 334P, 528336, 528338, 528339, 528340, 528346, 528349, C08G 6926

Patent

active

042107431

ABSTRACT:
The invention provides transparent polyamides which have a specific viscosity of at least 0.4 dl/g (0.5% in m-cresol at 25.degree. C.). They consist of recurring structural units of the formula I ##STR1## and, as the case may be, of recurring structural units of the formula II ##STR2## wherein X.sub.1 represents ##STR3## X.sub.2 represents ##STR4## R.sub.1 and R.sub.8 represent in general alkyl radicals. R.sub.1 to R.sub.3 can also represent hydrogen, and R.sub.5 and R.sub.6 and R.sub.7 and R.sub.8, together with the carbon atom to which they are attached, also represent cycloalkyl. The polyamides are derived in their structure from 100 to 25 mol % of terephthalic acid and from isophthalic acid. The polyamides may contain only up to 75 mol % of structural elements of the formula II. They are suitable for the manufacture of transparent moulded articles.

REFERENCES:
patent: 3563959 (1971-02-01), Schade et al.
patent: 3939147 (1976-02-01), Hugelin et al.
Chemical Abstracts, vol. 40 (1946), 900.sup.3.
Chemical Abstracts, vol. 85 (1976), 79037d.
Chemical Abstracts, vol. 36 (1942), 4720.sup.4.

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