Process for eliminating surface melt fracture during extrusion of thermoplastic polymers
US4554120A · kind A · utility
12Cited by
11References
32Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 3, 1984 |
| Grant date | Nov 19, 1985 |
| Priority date | — |
| Expiry date | Jul 3, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2023/003
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process and apparatus as provided for substantially eliminating surface melt fracture during extrusion of a thermoplastic polymer such as a molten narrow molecular weight distribution, linear, ethylene copolymer, by using a die having a die land region defining opposing surfaces at least one of which is fabricated from an alloy containing 5 to 95 parts by weight zinc and 95 to 5 parts by weight of copper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.