Process for producing high strength polyester yarn for improved fatigue resistance
US4867936A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 8, 1988 |
| Grant date | Sep 19, 1989 |
| Priority date | — |
| Expiry date | Dec 8, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60C9/0042
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
High strength polyester multifilament yarn of improved dimensional stability, which has the proper combination of an intrinsic viscosity of at least 0.90, relatively low work loss and a high degree of toughness, is incorporated as tire cord into a rubber tire for reinforcement to provide an important improvement in fatigue life and retained fatigue strength. The continuous melt-spin process comprises the steps of feeding prepolymer to a first finisher vessel to achieve at least 0.4 intrinsic viscosity transferring polymer to a second finisher vessel for a period sufficient to achieve an intrinsic viscosity of at least 0.95, and supplying this polymer to an extrusion spinnerette.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.