Process for laser-marking thermoplastic articles
US5346802A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1992 |
| Grant date | Sep 13, 1994 |
| Priority date | — |
| Expiry date | Sep 29, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Laser-marks (such as indicia, characters, symbols, patterns and the like) of exceptionally clear and thambiguous quality may be inscribed on the surface of an article whose surface region to be laser-marked is formed of a thermoplastic resin composition having a critical oxygen index of 22% or above as determined by ASTM D2863. The entire article may be formed (molded of such a thermoplastic resin composition, or the article may include a non-thermoplastic core having a surface layer thereof of the thermoplastic resin composition. Preferably, the thermoplastic resin composition is a polybutylene terephthalate with one or more flame retardants which impart the requisite critical oxygen index thereto.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.