Intrinsically gel-free, randomly branched polyamide
US6835799B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 18, 2001 |
| Grant date | Dec 28, 2004 |
| Priority date | — |
| Expiry date | Jun 18, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2969
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention relates to a randomly branched polyamide comprising at least units derived from:1. AB monomers,2. at least one compound I, being a carboxylic acid (Av) having a functionality v≧2 or an amine (Bw) having a functionality w≧2,3. at least one compound II, being a carboxylic acid (Av) having a functionality v≧3 or an amine (Bw) having a functionality w≧3, compound II being a carboxylic acid if compound I is an amine or compound II being an amine if compound I is a carboxylic acid and the amounts of all units derived from carboxylic acids and amines in the polyamide satisfying conditions as mentioned in claim 1.The composition of the randomly branched polyamide is such that it cannot form a crosslinked polyamide (and thus no gels, either), in particular during the prepolymerization, the polymerization, the post-condensation, the processing and the storage of the randomly branched polyamide, and this at a variety of ambient factors, for instance at elevated temperature and pressure. The polyamide is eminently suitable for the production of fiber and film, in particular for flat film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.