Star-shaped nylons, methods for their preparation, tetrasubstituted carboxylic acids and methods for their preparation
US5346984A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 14, 1993 |
| Grant date | Sep 13, 1994 |
| Priority date | — |
| Expiry date | Apr 14, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G69/48
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Star-shaped nylons with low melt viscosities and excellent mechanical properties, methods for their preparation, a novel tetrasubstituted carboxylic acid for use as a polymerization core therefor and methods for its preparation are provided. A star-shaped nylon has polymer chains emanating from 3 or more polymerization initiation groups which are substituents bonded to every other or more separated carbon atoms on an aromatic ring of an aromatic compound. The star-shaped nylon is produced by homogeneously mixing the aromatic compound with molten nylon monomer and polymerizing the nylon monomer with the respective polymerization initiation groups as the starting points. A novel tetrasubstituted carboxylic acid having a structure of 3,5,3',5'-biphenyltetracarboxylic acid is useful as a polymerization core for star-shaped nylons.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.