Dark neutral gray glass composition with low transmittance, and glass formed therefrom

• US 9,120,695 B2
• Filed: 08/02/2012
• Issued: 09/01/2015
• Est. Priority Date: 08/05/2011
• Status: Active Grant

• Current Assignee: KCC Glass Corp.
• Original Assignee: KCC Corporation
• Inventors: Lee, Yun Hee, Kim, Yong Yi, Lim, Jae Chung
• Primary Examiner(s): Green, Anthony J
• Assistant Examiner(s): Bolden, Elizabeth A
• Application Number:
  US14/237,303
• Publication Number:
  US 20140249014A1
• Time in Patent Office: 1,125 Days
• Field of Search: 501/70, 501/71
• US Class Current: 1/1
• CPC Class Codes: C03C 3/087 containing calcium oxide, e.g. common sheet or container glass
• CPC Class Codes: C03C 4/02 for coloured glass
• CPC Class Codes: C03C 4/08 for glass selectively absorbing radiation of specified wave lengths
• CPC Class Codes: C03C 4/082 for infrared absorbing glass
• CPC Class Codes: C03C 4/085 for ultraviolet absorbing glass

Abstract

The present invention relates to a dark neutral gray glass composition with a low transmittance, and a glass formed therefrom, and more specifically, to a dark neutral gray glass composition with a low transmittance and a low color purity, wherein an appropriate amount of Fe₂O₃, CoO and Se are used as a colorant component, and the FeO content in Fe₂O₃ and the CoO and Se relative content are delimited by a predetermined range, so as to lower the transmittance of visible rays, solar energy and ultraviolet rays and color purity, thereby protecting privacy in a vehicle, a building and the like, enabling harmony among the various colors thereof, and protecting an interior material and people from ultraviolet rays, and to a glass formed therefrom.

Claims

1. A dark, neutral gray-colored, low-transmittance glass composition with low color purity, comprising:

as colorant ingredients, 1.4 to 2 parts by weight of total Fe₂O₃, 0.02 to 0.035 parts by weight of CoO and 0.0015 to 0.004 parts by weight of Se, based on 100 parts by weight of a base glass composition,

wherein FeO content in the total Fe₂O₃ is 10 to 30% by weight,

the weight ratio of CoO to Se is from 6.5;

1 to 14;

1,

the glass composition does not comprise an oxide of rare-earth element selected from lanthanides consisting of Ce, Sc, Y, La, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, as an oxidant and a colorant ingredient

the glass composition does not comprise Cr, and

the glass composition has an ultraviolet ray transmittance (Tuv) of 2% or less, measured for a reference thickness of 4 mm.

2. The dark, neutral gray-colored, low-transmittance glass composition with low color purity according to claim 1, which has optical characteristics of a visible light transmittance (LT_A) of 15% or less, a solar energy transmittance (T_e) of 15% or less, a dominant wavelength (D_w) of 480 to 580 nm and an excitation purity (P_e) of 7% or less, measured for a reference thickness of 4 mm.

3. The dark, neutral gray-colored, low-transmittance glass composition with low color purity according to claim 2, which has optical characteristics of a visible light transmittance (LT_A) of 14% or less, a solar energy transmittance (T_e) of 13% or less, a dominant wavelength (D_w) of 490 to 565 nm and an excitation purity (P_e) of 6% or less, measured for a reference thickness of 4 mm.

4. The dark, neutral gray-colored, low-transmittance glass composition with low color purity according to claim 1, wherein the base glass composition comprises 65 to 75% by weight of SiO₂, 0.3 to 3% by weight of Al₂O₃, 10 to 18% by weight of [Na₂O+K₂O], 5 to 15% by weight of CaO and 1 to 7% by weight of MgO.

5. The dark, neutral gray-colored, low-transmittance glass composition with low color purity according to claim 1, which further comprises 0.005 to 0.5 parts by weight of MnO₂ based on 100 parts by weight of the base glass composition, for decolorization of green color development of Fe₂O₃.

6. A glass formed from the composition of claim 1.

7. The glass according to claim 6 which is for motor vehicles.