Phosphorescent synthetic resin material method for production th

Details Phosphorescent synthetic resin material method for production th Phosphorescent synthetic resin material method for production th

1995-12-22

1997-03-04

Willis, Jr., Prince

Compositions

Inorganic luminescent compositions with organic...

2523014R, 264 21, 264143, 26433111, C09K 1102

Patent

active

056076215

ABSTRACT:
Disclosed are a phosphorescent synthetic resin material capable of absorbing and accumulating light therein in the light and phosphorescing in the dark, a method for the production of the material, and a formed article or molded article made of the phosphorescent synthetic resin material. The phosphorescent synthetic resin material having a phosphorescent pigment, SrAl.sub.2 O.sub.4, uniformly dispersed in the synthetic resin is obtained by mixing the synthetic resin with the phosphorescent pigment and an activator and kneading the resultant mixture at a temperature 10 to 20.degree. C. higher than the melting point of the synthetic resin. In a preferred embodiment, the resultant compound is extruded at a temperature 10.degree. to 20.degree. C. higher than the melting point of the synthetic resin under an extrusion pressure in the range of 50 to 130 kg/cm.sup.2 and the extruded strands are chopped to produce pellets. By injection molding or extrusion molding the produced pellets into a desired shape, the formed article of synthetic resin possessing outstanding phosphorescent properties is obtained.

REFERENCES:
patent: 4640787 (1987-02-01), Goguen
patent: 5424006 (1995-06-01), Murayama et al.

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