Abstract:
Novel fulgimide compounds substituted on the nitrogen atom constituting the imide ring with a phenyl group having an electron attractive group at least at one of the m-positions, which are represented by general formula (I), wherein the group of general formula (a) is an optionally substituted divalent aromatic hydrocarbon or unsaturated heterocyclic group; the group of general formula (b) is an optionally substituted norbornylidene, bicyclo[3.3.1]nonylidene or adamantylidene group; and R is an electron attractive group; and the use of them as photochromic material. The fulgimide compounds develop colors in higher densities than those of the photochromic compounds of the prior art.
Abstract translation:在由通式(I)表示的至少一个m位上,在构成酰亚胺环的氮原子上被具有吸电子基团的苯基取代的新型游离基化合物,其中通式(a) 是任选取代的二价芳族烃或不饱和杂环基; 通式(b)的基团是任选取代的降冰片基,双环[3.3.1]壬叉基或金刚烷基; R 2是吸电子基团; 并将它们用作光致变色材料。 富马酰亚胺化合物以比现有技术的光致变色化合物更高的密度显色。
Abstract:
A curable silicone coating agent, in particular of a condensation-reaction curing type, that contains a wet-process silica which satisfies requirements (1) to (3) given below: (1) average diameter of an agglomerated particle measured by a laser diffraction scattering method: not exceeding 5 micrometers; (2) percentage of silica particles with the size of not greater than 1 micrometers, as measured by the laser diffraction scattering method, per all silica particles: not less than 10%; and (3) boiled linseed oil absorption: not less than 200 cc/100 g.
Abstract:
A process for the production of a photochromic product of curing by mixing a mixture comprising a polyfunctional (meth)acrylate monomer (e.g., crude polyalkylene glycol dimethacrylate containing impurities) and a photochromic spiro-oxazine compound with a compound having at least one epoxy group in the molecule (e.g., glycidyl methacrylate) and polymerizing the mixture thus obtained. This process can give a photochromic product of curing which little suffers from initial discoloration and is excellent in initial chromophoric activity.
Abstract:
A photochromic curable composition prepared by blending a monomer mixture comprising: (A) a compound having at least one epoxy group in the molecule (e.g., glycidyl methacrylate), (B) polypropylene glycol di(meth)acrylate, (C) polyethylene glycol di(meth)acrylate, and (D) a (meth)acrylate monomer and/or a styrelic monomer with (E) alpha -methylstyrene dimer and (F) a photochromic compound. This composition is excellent in moldability in curing and can give a product of curing excellent in the persistence of photochromism.
Abstract:
The invention provides highly transparent single crystalline AlN layers as device substrates for light emitting diodes in order to improve the output and operational degradation of light emitting devices. The highly transparent single crystalline AlN layers have a refractive index in the a-axis direction in the range of 2.250 to 2.400 and an absorption coefficient less than or equal to 15 cm-1 at a wavelength of 265 nm. The invention also provides a method for growing highly transparent single crystalline AlN layers, the method including the steps of maintaining the amount of Al contained in wall deposits formed in a flow channel of a reactor at a level lower than or equal to 30 % of the total amount of aluminum fed into the reactor, and maintaining the wall temperature in the flow channel at less than or equal to 1200°C.
Abstract:
2-Aminothiazoleacetic acid derivatives of general formula (I), wherein R , X and Y are each a specified organic group. These compounds are particularly useful for the acylation of some cephalosporin antibiotics.
Abstract:
A polycrystalline silicon rod characterized by having a half value width of the X-ray diffraction pattern peak showing a crystal orientation (111) of not more than 0.3 DEG , an internal distortion factor in the radial direction of less than 5.0 x 10 cm , and an internal iron concentration of not more than 0.5 ppba. Such a high-crystallinity, high-purity and low-internal distortion polycrystalline silicon rod is prepared by heating a silicon core material in a gaseous atmosphere comprising trichlorosilane and hydrogen to deposit silicon onto the silicon core material to prepare a polycrystalline silicon rod and then heat treating the rod out of contact with the open air to reduce an inherent strain.
Abstract translation:一种多晶硅棒,其特征在于具有显示晶体取向(111)不大于0.3°的X射线衍射图峰的半值宽度,径向内部的内部变形因子小于5.0×10 -5 > cm -1,内部铁浓度不大于0.5ppba。 通过在包含三氯硅烷和氢气的气氛中加热硅芯材料来制备这种高结晶度,高纯度和低内部变形的多晶硅棒,以将硅沉积到硅芯材料上以制备多晶硅棒,然后加热 处理杆与露天空气接触以减少固有的应变。
Abstract:
A process by which an aqueous solution of a tetraalkylammonium hydroxide remarkably lowered in the content of metal ions such as alkali metal ions can be prepared in a high yield and by a simple means. A high-purity aqueous solution of a tetraalkylammonium chloride substantially free from metal ions such as alkali metal ions can be prepared by reacting a high-purity trialkylamine with a high-purity alkyl chloride in high-purity water; and the electrodialysis of this solution in the form of an aqueous solution without being preceded by evaporation to dryness can give a remarkably high-purity aqueous solution of a tetraalkylammonium hydroxide in a high yield with little lowering in the purity.
Abstract:
A building material, which comprises a decorative layer provided on a surface of a base material and containing calcium carbonate as a bonding component and a gas permeable protective sheet laminated on a surface of the decorative layer with a peel strength of 200 to 4,000 mN without a separate adhesive layer therebetween, and a method of manufacturing the same. The building material is excellent in prevention of dirt and abrasion resistance and is enhanced in serviceability.
Abstract:
A dental primer composition which is useful as a pretreatment for a chemically polymerizable adhesive and with which a high bonding strength is obtainable for both the dentine and the enamel. It comprises a polymerizable monomer containing an acid group, water, an aryl borate, and a transition metal compound.