| 摘要 |
1,119,173. Laminates; sheet casting light polarizing plastics. J. F. DREYER. 5 Oct., 1966 [14 Oct., 1965], No. 42322/65.. Headings B5A and B5N. [Also in Division G2] Transparent polymeric materials having linear polar molecules are rendered light polarizing by bringing the softened polymer into surface contact with a matrix having orientated surface molecules, allowing the polymer to set whilst in contact with the matrix, whereby the surface molecules of the polymer take up the alignment of the surface molecules of the matrix, stripping off the polymer, and treating it with a dichroic dye; (see Divisions G2-G3). The plastic to be polarized may be extruded (Fig. 6, not shown) on to the matrix which is in the form of a rotating drum and constructed of metal (e.g. Al) or plastic (e.g. a polycarbonate), and is heat set and then air cooled. The polarized plastic, which may be a polycarbonate, a terephthalate polyester, ethyl cellulose, cellulose acetate or laminates thereof, is protected by laminating a plastic sheet thereto by calendering between rollers one of which is heated (Figs. 3 and 4, not shown).
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