# US 7,611,773 B2 · Glass composition and laminated glass

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- Number: US 7,611,773 B2
- Document ID: US7611773B2
- Status: Granted
- Kind: B2
- Application number: 11/762,527
- Filed: 2007-06-13
- Published: 2007-10-11
- Granted: 2009-11-03
- Earliest claimed: 2002-09-25
- Assignees: Nippon Sheet Glass Co., Ltd.
- Inventors: Hiromitsu Seto; Nobuyuki Yamamoto; Hiroyuki Tanaka
- Web page: https://patentgrep.com/patent/US7611773B2

## CPC

- B32B 17/10761: {containing vinyl acetal}
- B32B 17/10036: {comprising two outer glass sheets}
- B32B 17/1011: {having predetermined tint or excitation purity}
- B32B 17/10339: {Specific parts of the laminated safety glass or glazing being colored or tinted (tinted glass sheet B32B17/1011; tinted interlayer B32B17/10651)}
- B60J 1/00: Windows; Windscreens; Accessories therefor (B60J10/00 takes precedence; air curtains instead of windows B60J9/04 {; sealing strips for windshields B60J10/70; sealing sash guides for sliding window panes B60J10/74; glass partitions inside vehicles to protect occupants against personal attack B60R21/12})
- B60R 11/02: for radio sets, television sets, telephones, or the like; Arrangement of controls thereof
- C03C 3/087: containing calcium oxide, e.g. common sheet or container glass
- C03C 4/082: {for infrared absorbing glass}
- Y10T 428/31645: Next to addition polymer from unsaturated monomers
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B60J: WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES (fastening, suspending, closing, or opening of such devices E05)
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## 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.

## Claims

### Claim 1

A laminated glass comprising at least two glass sheets and at least one resin layer therebetween, wherein the at least two glass sheets includes at least one glass sheet comprising a glass composition comprising, in % by weight,
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 (T-Fe2O3),
in which the sum of MgO, CaO, SrO and BaO is 10 to 15%, and the sum of Li2O, Na2O and K2O is 14 to 20%,
wherein, at a thickness of 2.1 mm, 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%,
and the laminated glass has a visible light transmittance of 69% or more as measured with the CIE Standard illuminant A and a total solar energy transmittance of not more than 45%.

### Claim 2 (depends on 1)

The laminated glass according to claim 1, wherein the total solar energy transmittance is not more than 42%.

### Claim 3 (depends on 1)

The laminated glass according to claim 1, wherein the resin layer contains functional fine particles dispersed therein.