Title:
TRANSPARENT MULTILAYERED SHEET AND MANUFACTURE THEREOF
Document Type and Number:
Japanese Patent JP3451785
Kind Code:
B2
Abstract:
PURPOSE: To provide a transparent multilayered sheet, which is excellent in weatherability and surface hardness and, at the same time, has shock resistance and large interlaminar bonding force and develops no harmful gas upon burning.
CONSTITUTION: In a multilayered sheet, in which at one side or both sides of layer 1 made of a copolymer polyester (PETG) of polycyclihexylene terephthalate and ethylene terephthalate, a layer 3 made of polymethyl methacrylate (MMA), a layer 2 made of polycarbonate(PC) is integrally arranged between the PETG layer 1 and the MMA layer 3. The transparent multilayered sheet can be produced by co-extruding the PETG, the MMA and the PC. At the co-extrusion, the meld viscosity of the PC is set to be 0.5-1.5 times as much as the melt viscosities of the PETG and of the MMA. Further, the thickness of the PC layer is preferably set to be 50-1,000μm.
Inventors:
Kazumasa Makihata
Yukitaka Tasaka
Yukitaka Tasaka
Application Number:
JP9634895A
Publication Date:
September 29, 2003
Filing Date:
April 21, 1995
Export Citation:
Assignee:
Shin-Kobe Electric Machinery Co., Ltd.
International Classes:
B32B27/08; B32B27/30; B32B27/36; (IPC1-7): B32B27/30; B32B27/36
Domestic Patent References:
| JP4270652A | ||||
| JP6115028A | ||||
| JP8142279A | ||||
| JP8151457A | ||||
| JP490533U |