Oriented crystallization of polymers
US4020266A · kind A · utility
7Cited by
4References
5Claims
0Family size
Inventors
Key dates
| Filing date | Jan 23, 1975 |
| Grant date | Apr 26, 1977 |
| Priority date | — |
| Expiry date | Jan 23, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F6/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Crystalline polymer fibrils having a highly ordered crystalline core surrounded by less ordered crystalline polymer are produced by causing a solution of the polymer to flow through a gauze. The solution is at a temperature below the dissolution temperature of the polymer but above the temperature at which the polymer will crystallize spontaneously in an unstirred solution. The flow rate is selected in relation to the gauze dimensions to impart a sufficiently high longitudinal velocity gradient to the solution flowing through the gauze, preferably about 10.sup.2 sec.sup..sup.-1 or greater.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.