Production of polyester shaped product
US4717516A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 1986 |
| Grant date | Jan 5, 1988 |
| Priority date | — |
| Expiry date | Jan 30, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2367/02
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for enhancing the adhesion of the surface of a shaped product made of a polyester composition which comprises applying corona discharge to the surface under the continuous movement between an electrode for discharge and another electrode opposite thereto while jetting a gaseous material containing oxygen in an amount of not more than 20% by volume onto the part of said surface to which corona discharge is applied so as to achieve the following relationships among oxygen indexes and nitrogen indexes before and after the application of corona discharge: EQU -3.5.ltoreq.(Oi'-Oi)/(Ni'-Ni).ltoreq.1.5 (1) EQU 3.ltoreq.Ni' (2) wherein Oi and Oi' are respectively the oxygen indexes before and after the application of corona discharge and Ni and Ni' are respectively the nitrogen indexes before and after the application of corona discharge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.