Method of deforming thermoplastic polymers using ammonia as a reversible plasticizer
US4273739A · kind A · utility
0Cited by
4References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 12, 1979 |
| Grant date | Jun 16, 1981 |
| Priority date | — |
| Expiry date | Jul 12, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2105/0005
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Ammonia is utilized as a reversible plasticizer in the deformation of theplastic polyamides so as not to degrade the mechanical properties of the deformed material. It may be retained in the material under pressure and/or low temperature during extrusion or other deformation processes and is spontaneously released with time and at reduced pressure and/or elevated temperature at the end of the process, such as at the exit side of an extruder die.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.