Stock material or miscellaneous articles – Structurally defined web or sheet – Continuous and nonuniform or irregular surface on layer or...
Patent
1994-04-13
1995-06-06
Lesmes, George F.
Stock material or miscellaneous articles
Structurally defined web or sheet
Continuous and nonuniform or irregular surface on layer or...
428480, B32B 310, D06N 704, G03C 1494, G03C 544
Patent
active
054221617
ABSTRACT:
Laser-marks (such as indicia, characters, symbols, patterns and the like) of exceptionally clear and unambiguous 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.
REFERENCES:
patent: 5035983 (1991-07-01), Kiyonari et al.
Ohbachi Yoshinori
Tomita Hisashi
Lesmes George F.
Polyplastics Co. Ltd.
Shelborne Kathryne E.
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