Transparent copolyamide from oligomeric amide and cycloaliphatic diamine and process for the production thereof
US4898896A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1988 |
| Grant date | Feb 6, 1990 |
| Priority date | — |
| Expiry date | Sep 26, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G69/36
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A transparent polyamide containing terephthalic acid radicals or radicals of the mixture of terephthalic and isophthalic acids and a cycloaliphatic diamine radical and having the chain formations: ##STR1## in which: y.sub.1 +y.sub.2 is between 10 and 200 with y.sub.1 /(y.sub.1 +y.sub.2)>0.5; PA1 m, p, m' and p' are whole numbers equal to or greater than zero, such that: ##EQU1## is between 0.5 and 10, taken statistically over the marcomolecule; Z and Z' are the same or different and are either a polymethylene segment --(CH.sub.2)--.sub.n where n is a whole number equal to or greater than 6 or a sequence containing an amide resulting from condensation of an aliphatic diamine containing at least 6 carbon atoms between the amine functions and an aliphatic dicarboxylic acid containing at least 4 carbon atoms between the acid functions; PA1 A and B are the same or different and represent hydrogen or a methyl, ethyl, or isopropyl radical; PA1 X and Y are the same or different and represent hydrogen or a methyl radical; and PA1 q is a whole number between 0 to 6. The process of making such polyamide comprises a first stage wherein terephthalic acid or a mixture of terephthalic and isophth…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.