Glass composition and laminated glass

Abstract

A laminated glass having a low haze ratio and an excellent infrared rays shield performance and a glass composition suitable for use in a laminated glass and easy with respect to melting and molding works, which is a glass composition comprising 65 to 74% of SiO2, 0 to 5% of B2O3, 1.9 to 2.5% of Al2O3, 1.0 to 3.0% of MgO, 5 to 10% of CaO, 0 to 10% of SrO, 0 to 10% of BaO, 0 to 5% of Li2O, 13 to 17% of Na2O, 0.5 to 5% of K2O, 0 to 0.40% of TiO2 and 0.3 to 2.0% of total iron oxide in terms of Fe2O3, on a weight basis, in which the sum of MgO, CaO, SrO and BaO is from 10 to 15% and the sum of Li2O, Na2O and K2O is from 14 to 20%, wherein the glass composition has a visible light transmittance of 80% or more as measured with the CIE Standard illuminant A and a total solar energy transmittance of not more than 62% at a thickness of 2.1 mm, and a laminated glass using a glass sheet made of that glass composition.

Description

[0001] The present invention relates to a laminated glass having an excellent infrared rays (IR rays) shield performance and to a glass composition that is suitable for use in the laminated glass. More specifically, the invention relates to a laminated glass that does not use a specific interlayer or heat ray reflecting film but exhibits an infrared rays shield performance substantially equal to those having an interlayer or heat ray reflecting film and to a glass composition that is suitable for use in the laminated glass.DESCRIPTION OF THE RELATED ART

[0002] In recent years, for reducing loads of air conditioning of automobiles, glazings having an infrared rays shield performance are used as automobile window shields. For example, there are thin film-provided glass sheets in which a thin film made of a metal or a metal oxide is laminated on the surface of a glass sheet. However, since such metal or metal oxide-made thin films have a conductive capacity and shield radio waves, there...