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Patent Searching and Data


Title:
NEW LAMINATED PRODUCT
Document Type and Number:
Japanese Patent JPH04282243
Kind Code:
A
Abstract:

PURPOSE: To prevent a laminated product from becoming white and also improve scratch resistance by laminating a polyvinylbutylal sheet layer and a glass sheet layer sequentially on a polycarbonate resin sheet layer having a weight average molecular weight of 40,000 or higher.

CONSTITUTION: A polycarbonate resin sheet PC layer 3 having a weight average molecular weight of 40,000 or higher, a polyvinylbutylal sheet PVB layer 2 and a glass sheet layer 1 are stacked over each other. After this, this laminated product is placed in a decompressed atmosphere so that air is removed sufficiently from the inter-layer space and the layers are allowed to stick to each other under thermal pressurized conditions. The PC sheet layer recommended is a sheet having a weight average molecular weight of 20,000 or higher and biaxially stretched by a factor of 2 or more in terms of area ratio. The PVB sheet layer acts to adhere the glass sheet to the PC sheet layer, prevent the laminated product from cracking due to a bimetal effect during a cool/heat cycle test following the generation of a crack on account of a difference in the coefficients of thermal expansion of the glass sheet layer and the PC sheet layer, and improve the anti-impact properties of the laminated product.


Inventors:
KATAOKA HIROSHI
TOYOUCHI KAORU
Application Number:
JP4483191A
Publication Date:
October 07, 1992
Filing Date:
March 11, 1991
Export Citation:
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Assignee:
ASAHI CHEMICAL IND
International Classes:
B29C55/12; B32B17/06; B32B27/30; B32B27/36; C03C27/12; B29K69/00; B29L7/00; (IPC1-7): B29C55/12; B29K69/00; B29L7/00; B32B17/06; B32B27/30; B32B27/36; C03C27/12