| 摘要 |
1,209,450. Reflective beads. INDUSTRIAL SCIENCE RESEARCH PTY. Ltd. 12 Dec., 1967 [13 Dec., 1966], No. 56423/67. Heading B2E. A reflective bead is obtained by coating a bead with a surface material in solid or liquid form, surrounding the coated bead with a carry ing compound and heating to a temperature sufficient to gasify the surface material and thereby forming a coating gas retained in the carrying compound and fairly encapsulating the bead. The surface material may be ammonium carbonate, thichriazole, azodicarbonamide or diphenylsulphon-3;3-disulphonhydrazide. The carrying compound may be polymethylacrylate or polychlorsulphonated polyethylene. The beads may be made of glass. The coated beads may be incorporated into a base carrier which may comprise a laminar form, a layer of material containing reflective metallic particles, one or more layers of thermoplastic protective material, a layer of pressuresensitive adhesive coating layer and an outer release film. In the embodiment shown in the Figure glass 'beads are freely encapsulated within bubbles of gas 2 are envelopably protected by a polymethacrylate carrying compound 3. The domed surface 4 has a layer 5 of aluminium powder and titanium dioxide in a polymethacrylate carrier applied thereto, a layer 7 of pressure-sensitive adhesive and a final release film 8. |
