Transparent polyamides from branched chain diamines
US4210743A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 1978 |
| Grant date | Jul 1, 1980 |
| Priority date | — |
| Expiry date | Oct 26, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G69/26
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.