Luminescent article with high phosphor to binder ratio and manufacture thereof

摘要

PCT No. PCT/EP93/01551 Sec. 371 Date Nov. 2, 1994 Sec. 102(e) Date Nov. 2, 1994 PCT Filed Jun. 17, 1993 PCT Pub. No. WO94/00530 PCT Pub. Date Jan. 6, 1994A luminescent article comprising a self-supporting or supported layer of phosphor particles dispersed in a binding medium and a protective coating thereover wherein the binding medium consists essentially of one or more hydrogenated styrene-diene block copolymers, having a saturated rubber di-block or tri-block having a styrene endblock on respectively one or both sides of the di-block or tri-block, as rubbery and/or elastomeric polymers. The ratio by volume of phosphor to binding medium is more than 70/30 and preferably more than 85/15. By using the hydrogenated diene copolymers which are rubbery and/or elastomeric polymers, the phosphor layer has improved elasticity, high protection against mechanical damage and thus high ease of manipulation and high pigment to binder ratio without deterioration after frequent reuse.