Method for the improvement of a gramophone record
US4307045A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 2, 1980 |
| Grant date | Dec 22, 1981 |
| Priority date | — |
| Expiry date | Dec 2, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S522/914
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention provides a novel means for the improvement of the surface properties of a gramophone record made of a vinyl chloride-based resin which is deficient in respect of the susceptibility to electrostatic charging and anti-wearing resistance with consequent noise generation in the playing of the record. The inventive method comprises irradiating the surface of the gramophone record with ultraviolet light having a substantial energy distribution in the wavelength region of 200 nm or shorter in an atmosphere of oxygen or an oxygen-containing gaseous mixture of which the pressure or partial pressure of oxygen is at least 15 Torr. The effect of the ultraviolet irradiation is further enhanced and the durability of the antistatic effect is increased by bringing the ultraviolet-irradiated surface of the gramophone record into contact with a solution containing a surface active agent followed by washing with water and drying.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.