Central Glass Company, Limited

Central Glass Products Co., Ltd.

Naoya Hirata

Tatsuya Tsuzuki

Naoki Mitamura

Hiroki Nakamura

A vehicle window glass () includes a first glass sheet (), a second glass sheet () and an interlayer film () sandwiched between a second surface (S) of the first glass sheet and a third surface (S) of the second glass sheet. For weight reduction, at least one of the glass sheets () has a thickness of 2.0 mm or smaller. The interlayer film () has a main part () provided with a rigid layer and a peripheral part () formed of a non-rigid layer. The peripheral part () is disposed along an upper side of the vehicle window glass () which is exposed to air. Contact of water with the rigid layer of the main part () is prevented by the non-rigid layer of the peripheral part (). The rigid layer has a water content controlled to 0.5% or lower as measured by near-infrared spectroscopy.

Vehicle window glass

An automotive laminated glass includes a thermoplastic interlayer film, a curved first glass sheet, and a curved second glass sheet. The thermoplastic interlayer film is disposed between the first and second glass sheets. The first glass sheet is a 0.7- to 3-mm thick non-chemically strengthened glass sheet including a convex-side first main surface and a concave-side second main surface facing the thermoplastic interlayer film. The second glass sheet is an ion-exchanged, 0.3- to 1.5-mm thick chemically strengthened glass sheet including a convex-side third main surface facing the thermoplastic interlayer film and a concave-side fourth main surface. The second glass sheet is thinner than the first glass sheet, and is adjusted to have a curvature equal to the curvature of the first glass sheet. A compressive stress layer on the concave-side fourth main surface is thicker than a compressive stress layer on the convex-side third main surface.

Automotive laminated glass, and production method therefor

An automotive laminated glass includes a thermoplastic interlayer film, a curved first glass sheet, and a curved second glass sheet. The thermoplastic interlayer film is disposed between the first and second glass sheets. The first glass sheet is a 0.7- to 3-mm thick non-chemically strengthened glass sheet including a convex-side first main surface and a concave-side second main surface facing the thermoplastic interlayer film. The second glass sheet is an ion-exchanged, 0.3- to 1.5-mm thick chemically strengthened glass sheet including a convex-side third main surface facing the thermoplastic interlayer film and a concave-side fourth main surface. The second glass sheet is thinner than the first glass sheet. The convex-side third main surface has a compressive stress layer thicker than that on the concave-side fourth main surface, and the second glass sheet is adjusted to fit the curvature of the first glass sheet.

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Matsusaka, Japan

Naoya Hirata