Transparent polyamides from branched chain diamine
US4210742A · 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 transparent polyamides of the invention have a reduced specific viscosity of at least 0.4 dl/g (0.5% solution of the polyamide in m-cresol at 25.degree. C.) and consist either of PA1 (a) recurring structural units of the formula (I) ##STR1## wherein the carbonyl groups are in the 1,3- or 1,4-position to one another (the proportion of carbonyl groups in the 1,3-position being 30 to 100%) and each of R.sub.1 and R.sub.2 is methyl or R.sub.1 and R.sub.2 together with the carbon atom to which they are attached are cycloalkyl of 4 to 6 carbon atoms, or of PA1 (b) recurring structural units of the formula (II) ##STR2## wherein the carbonyl groups are in the 1,3- or 1,4-position to one another (the proportion of carbonyl groups in the 1,3-position being 30 to 50%) and R.sub.3 and R.sub.4 are alkyl, or of PA1 (c) recurring structural units of the formula (V) ##STR3## wherein the carbonyl groups are either exclusively in the 1,3-position or exclusively in the 1,4-position to one another or partly in the 1,3-position and partly in the 1,4-position, and wherein R.sub.5 and R.sub.6 together with the carbon atom to which they are attached are cycloalkyl of 7 to 12 carbon atoms. The polyamid…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.