| 摘要 |
1,124,254. Extrusion moulding composite articles; laminates. MONSANTO CO. 17 Sept., 1965 [18 Sept., 1964], No. 39778/65. Headings B5A and B5N. An interlayer for safety glass comprises a transparent or translucent plastics material having embodied therein a uniformly pigmented plastics strip of contsant width but varying thickness. Safety glass is made by bonding the interlayer between sheets of glass or other transparent or translucent material. The interlayer is made by extruding the pigmented material through an orifice 14 of die 16 to form a strip within the main body of material which is shaped at orifice 18. This main body of material may also be pigmented with the same or a different colour to that of the strip. Various cross-sectional configurations for the strip are described, Fig. IV (not shown). The interlayer is preferably of plasticized polyvinyl acetal and is preferably laminated between glass plates, e.g. under a pressure of 150-225 p.s.i. and at a temperature of 200-325‹ F. Its thickness may lie in the range 0À010-0À065 inche. The preferred polyvinyl acetal resin is polyvinyl butyral. Suitable plasticizers are mentioned with preferably 20-50 parts of plasticizer being used per hundred parts by weight of the resin. Numerous pigments are mentioned, the average particle size of which is preferably less than 10 microns. Apart from glass, materials specifically mentioned for the outer layers are polymethyl methacrylate, polystyrene, PVC, polypropylene, polyethylene terephthalate, cellulose acetate and cellulose nitrate. |
