Nippon Electric Glass Co., Ltd.

Yoshio Hashibe

Takehiro Shibuya

Takashi Sakane

Takahiro Matano

Masayuki Ninomiya

Masanori Moritake

Yasuhiro Baba

Masahiro Sawada

Toyohide Kurahashi

A fire-protection glass product having a heat shielding characteristic comprises a fireproof glass plate, a heat ray reflection film formed on one or both of opposite surfaces of the fireproof glass plate, and an oxidation prevention film formed on the heat ray reflection film.

Fire-protection glass product with heat shielding characteristic and method for using the same

Marble-like glass ceramic which consists essentially of, by weight percent, 50-75% SiO.sub.2, 1-15% Al.sub.2 O.sub.3, 6-16.5% CaO, 0.1-5% Li.sub.2 O, 0-1.5% B.sub.2 O.sub.3, 10-17.5% CaO+Li.sub.2 O+B.sub.2 O.sub.3, 2.5-12% ZnO, 0-12% BaO, 0.1-15% Na.sub.2 O+K.sub.2 O, and 0-10% coloring agents, said ceramic comprising .beta.-wollastonite precipitated as a major crystal. The coloring agents comprises at least one selected from a group of Fe.sub.2 O.sub.3, NiO, CoO, MnO.sub.2, Cr.sub.2 O.sub.3, and CuO. The marble-like glass ceramic may further comprises at least one of As.sub.2 O.sub.3 and Sb.sub.2 O.sub.3 of up to 1% as refining agents, at least one of up to 1.5% MgO and up to 1.5% SrO so as to improve meltability of the glass, and at least one of up to 1% TiO.sub.2, up to 1% ZrO.sub.2, and up to 1% P.sub.2 O.sub.5 so as to make the glass stable and less devitrifiable.

Marble-like glass ceramic

A crystallized glass article having a surface pattern like granite, marble or other natural stones with a line pattern of a desired color or colors, which is formed by fusion bonding small masses of a crystallizable glass material mixed with inorganic pigment powder at a heat-treating temperature higher than the softening point. The surface pattern comprises crystallized glass areas defined by the small masses in the surface layer of the article and the colored line pattern defined by the pigment dispersed in the interfaces between adjacent ones of the small masses in the surface layer.

Colored crystallized glass article and method for producing the same

In a crystallized glass article consisting of crystallized glass masses fusion bonded together and having a principal surface, said principal surface having a surface pattern determined by said masses in a surface layer including said principal surface, said small crystallized glass masses in said surface layer are mainly of flaky crystallized glass pieces, each being a relatively large flattened piece, said flaky pieces overlapping one another at random to make said principal surface rough, said crystallized glass masses in another layer adjacent to and fused to said surface layer being considerably smaller than said flaky pieces. The article is produced by preparing flaky pieces and the smaller masses both of a SiO.sub.2 --Al.sub.2 O.sub.3 --CaO crystallizable glass, putting the former pieces on a bottom of a mold to form a flaky-piece layer, then putting the latter masses on the flaky-piece layer to form a small-mass layer, and heat treating the both layers at a temperature higher than a softening point of the crystallizable glass to fusion bond the pieces and masses together as well as crystallizing the glass.

Crystallized glass article having an irregular rough surface pattern and

A crystallized glass article with a colored surface pattern, which comprises a crystallized glass substrate having a surface and small glass masses having a color different from the substrate and dispersed and fusion-bonded in the surface to form the colored surface pattern. The crystallized glass article is produced by depositing and dispersing small glass masses with a color on a surface of a substrate of a crystallizable glass with a different color which can precipitate crystals therein with softening and deforming by heat-treating at a heat treating temperature higher than the softening point of the crystallizable glass, then heating the substrate together with the small glass masses at the heat treating temperature.

Crystallized glass article with colored small masses dispersed in a

A crystallized glass having natural-marble-like surface patterns comprising 45 to 75 wt. % of SiO.sub.2, 1 to 25 wt. % of Al.sub.2 O.sub.3, 1 to 20 wt. % of CaO, 0.5 to 17 wt. % of MgO, 0.1 to 18 wt. % of BaO, 0 to 18 wt. % of ZnO, 1 to 15 wt. % of Na.sub.2 O, 0 to 7 wt. % of K.sub.2 O, 0 to 5 wt. % of Li.sub.2 O, 0 to 10 wt. % of B.sub.2 O.sub.3, 0 to 10 wt. % of P.sub.2 O.sub.5, 0 to 1 wt. % of As.sub.2 O.sub.3, and 0 to 1 wt. % of Sb.sub.2 O.sub.3, substantially free from nucleating agent, in which diopside type crystals are precipitated, and a method of producing the crystallized glass are disclosed.

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Shiga, Japan

Yoshio Hashibe