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    • 1. 发明授权
    • Infrared polarizing glasses
    • 红外偏光眼镜
    • US4479819A
    • 1984-10-30
    • US427732
    • 1982-09-29
    • Nicholas F. BorelliFrank CoppolaDavid L. MorseDaniel A. NolanThomas P. Seward, III
    • Nicholas F. BorelliFrank CoppolaDavid L. MorseDaniel A. NolanThomas P. Seward, III
    • C03B17/02C03B23/037C03B32/00C03C3/064C03C3/091C03C4/06G02B5/30C03C3/26C03B19/00C03C23/00
    • C03B32/00C03B17/02C03B23/037C03C3/064C03C3/091C03C4/06G02B5/3058Y10S430/165
    • The instant invention is directed to the preparation of glass articles exhibiting excellent polarization in the infrared portion of the spectrum from glasses characterized as containing silver halide particles therein selected from the group of AgCl, AgBr, AgI. The inventive method comprises four general steps:(a) a batch for a glass containing silver and at least one halide selected from the group of chloride, bromide, and iodide is melted and the melt shaped into a glass body of a desired geometry;(b) the glass body is subjected to a heat treatment at least above the strain point but not in excess of 50.degree. C. above the softening point of the glass for a period of time adequate to cause the generation of AgCl and/or AgBr and/or AgI particles therein, said particles ranging in size between 200-5000 .ANG.;(c) the glass body is elongated under stress at temperatures above the annealing point, but below that where said glass exhibits a viscosity of about 10.sup.8 poises, such that the particles are elongated to an aspect ratio of at least 5:1; and(d) the elongated glass body is exposed to a reducing environment at temperatures between 250.degree. C. and about 25.degree. above the annealing point of the glass to reduce the silver halide particles in the glass to metallic silver which is deposited in and/or upon the elongated particles.
    • 本发明涉及从其中选择AgCl,AgBr,AgI中含有卤化银颗粒的玻璃的红外线部分的红外部分显示优异的玻璃制品的制备。 本发明的方法包括四个一般步骤:(a)用于含有银的玻璃和选自氯化物,溴化物和碘化物中的至少一种卤化物的批料熔化并将其熔化成具有所需几何形状的玻璃体; (b)将玻璃体至少高于应变点,但不超过玻璃软化点50℃以上的热处理足以导致产生AgCl和/或AgBr的时间 和/或AgI颗粒,所述颗粒的尺寸范围为200-5000安培; (c)玻璃体在高于退火点的温度下在应力下伸长,但低于所述玻璃呈现约108泊的粘度,使得该颗粒伸长至至少5:1的纵横比; 和(d)细长玻璃体在比玻璃退火点高250℃至25℃的温度下暴露于还原环境中,以将玻璃中的卤化银颗粒还原为金属银,其沉积在和/ 或在细长的颗粒上。
    • 2. 发明授权
    • Photochromic glass
    • 光致变色玻璃
    • US4190451A
    • 1980-02-26
    • US14981
    • 1979-02-28
    • George B. HaresDavid L. MorseThomas P. Seward, IIIDennis W. Smith
    • George B. HaresDavid L. MorseThomas P. Seward, IIIDennis W. Smith
    • C03C3/064C03C3/11C03C4/06C03C21/00G02C7/10C03C3/08C03C3/26
    • C03C4/06Y10S501/903
    • The instant invention is concerned with transparent photochromic glass compositions which not only exhibit desirably rapid darkening and fading characteristics, but which also demonstrate the other physical and optical properties required for use in ophthalmic applications. Such glasses utilize the presence of silver chloride and/or silver bromide crystals to impart photochromic behavior in a narrowly-defined composition range within the alkali metal aluminoborosilicate base system. Copper ions are also included in the composition to perform as a sensitizing agent. The glasses have the capability of being either thermally tempered or chemically strengthened to comply with the United States Food and Drug Administration regulations for lenses used in ophthalmic applications. Improved independence of temperature effects upon the photochromic properties can be achieved where the copper level, expressed as CuO, is maintained between about 0.004-0.02% by weight, the chloride value, expressed as Cl, is held between about 0.1-0.25% by weight, the silver content, expressed as Ag, is included between about 0.15-0.3% by weight, and the quantity of bromide, expressed as Br, is varied between about 0.1-0.2% by weight. The fading rate of the glasses is enhanced by maintaining the molar ratio of alkali metal oxides to B.sub.2 O.sub.3 between about 0.55-0.85, the molar ratio of alkali metal oxides minus Al.sub.2 O.sub.3 to B.sub.2 O.sub.3 is about 0.25-0.4, and the weight ratio Ag:(Cl+Br) is about 0.65-0.95.
    • 本发明涉及透明光致变色玻璃组合物,其不仅表现出期望的快速变暗和褪色特性,而且还显示了用于眼科应用所需的其它物理和光学性质。 这种玻璃利用氯化银和/或溴化银晶体的存在,以在碱金属铝硼硅酸盐基体系内的窄范围的组成范围内赋予光致变色行为。 铜离子也包括在组合物中以用作敏化剂。 眼镜具有热回火或化学强化的能力,以符合美国食品和药物管理局对眼科应用中使用的镜片的规定。 可以实现温度对光致变色性能的独立性,其中以CuO表示的铜含量维持在约0.004-0.02重量%之间,氯化物值(以Cl表示)保持在约0.1-0.25重量% ,以Ag表示的银含量在约0.15-0.3重量%之间,以Br表示的溴的量在约0.1-0.2重量%之间变化。 通过将碱金属氧化物与B 2 O 3的摩尔比保持在约0.55-0.85之间,碱金属氧化物减去Al 2 O 3与B 2 O 3的摩尔比为约0.25-0.4,并且重量比Ag Cl + Br)为约0.65-0.95。