摘要:
A 3-alkenylcephem compound of the formula (1) wherein R1 is benzyl or phenoxymethyl, R2, R3 and R4 are alike or different and are each a hydrogen atom, C1-10 alkyl, C4-8 cycloalkyl or aryl C1-3 alkyl substituted or unsubstituted with C1-4 alkyl, R2 and R3, when taken together, form a group —(CH2)lXm(CH2)n— substituted or unsubstituted with C1-4 alkyl at an optional position, X is an oxygen atom or group —N(R5)—, l is 0 to 3, m is 0 or 1, n is an integer of 2 to 4, R5 is a hydrogen atom or C1-4 alkyl.
摘要:
A flame-retardant resin composition comprising a phosphazene flame retardant and a polyester resin, wherein the flame retardant is bonded to the molecules of the polyester resin via the ester group thereof, can retain a high flame retardance for a prolonged term with little or no vaporization with time and is excellent in flame retardance, impact resistance, properties and processability.
摘要:
A powdery flame retardant which is obtained by mixing a flame retardant which is liquid or a viscous solid at ordinary temperature with an inorganic fibrous substance to adhere or adsorb the retardant to the fibrous substance, and which comprises 5 to 70 wt. % the flame retardant and 95 to 30 wt. % the fibrous substance. The powdery flame retardant can be easily handled because it is a powder, and is obtained by a simple and industrially advantageous method. It produces a remarkable effect that the performance of the liquid or viscous flame retardant is not impaired.
摘要:
A thermoreversible recording material having its transparency changed in accordance with its thermal history, in particular the rate of cooling and the temperature to which it has been heated, comprises a matrix material and an organic compound of low molecular weight, wherein the matrix material comprises polyvinyl acetal, and the organic compound of low molecular weight comprises a saturated carboxylic acid or derivative thereof. The matrix material may further contains a material selected from a group consisting of epoxy resin, phenol resin, epoxy compound, aldehyde compound and isocyanate compound. A thermoreversible recording medium comprising the above thermoreversible recording material may be selectively heated by a thermal head or the like to record visual information. The visual information may be erased by heating the medium and cooling it slowly.
摘要:
An image recording device which permits repeated thermoreversible recording and erasure of an image, which is useful for creating an image for storage, display or printing of the image or other information. The recording device has a display medium, a recording means to form an image on the display medium, and an erasure means to erase the image formed on the medium. The display medium of the image recording device may have a support member with a recording layer provided on the support member. The display medium has a transparency which is dependent upon its thermal history, and consists essentially of a matrix material of a copolymer of styrene and butadiene, and a saturated carboxylic acid of 10 to 24 carbon atoms. The weight ratio of the matrix material to saturated carboxylic acid in the display medium is from 1:1 to 20:1.
摘要:
This invention is capable of providing a water purifying apparatus with a comparatively simple configuration that can be used easily.First, a usage state is adopted by operating the knob of the faucet. In doing so, the detection means detects the flow of the water. As a result, the control unit supplies electricity to the ultraviolet light generator based on the detection signal form the detection means, and ultraviolet light is emitted. The emitted ultraviolet light then irradiates water within the passage. Water sterilization can then be carried out as a result of doing this. The ultraviolet light generator only generates light when the faucet is in use. It is therefore possible to utilize the ultraviolet light generator for long periods of time and savings are made with respect to power consumption. Further, a curving part is formed in the passage, and the ultraviolet light generator is arranged in the vicinity of the curving part. The time for which the water is irradiated with ultraviolet rays from the ultraviolet light generator is therefore made long, and the water purification efficiency is improved.
摘要:
There is provided a light emitting device in this invention comprises a light source for supplying light, and plural light scattering devices disposed in front of the light source so as to be opposite to the direction of the light. Each of the light scattering devices comprises at least one striated surface forming plural prisms. The light is scattered by means of the prisms of the light scattering devices. This invention enables a light emitting device to achieve the spread of light with comparatively little light clustering. In particular, the light emitted from a local source can be changed from being directional to being non-directional even in case of use of the LED's source of light which is directional and so on. Therefore, the light emitting device pertaining to this invention is suitably adopted for use in the display of guardrails on the road. Moreover, in the case of using LED elements as the source of light, since LED's have a long lifetime and low power consumption, the device can be provided using a solar battery as a power source, thereby eliminating the trouble of battery replacement. Moreover, the adoption of the LED makes it easy to obtain the required power from a battery, and to eliminate defects such as broken wires caused by vehicular traffic, because conventional electric wires for supplying power are not required. Therefore, for example, the light emitting device with regard to this invention is suitable for use as an alarm light at construction sites.
摘要:
A process for preparing 7-amino-3-[(E/Z)-2-(4-methylthiazol-5-yl)vinyl]-3-cephem-4-carboxylic acid of the formula (1) and an alkali metal salt thereof, said acid and said salt being improved in the content of 7-amino-3-[(Z)-2-(4-methylthiazol-5-yl)vinyl]-3-cephem-4-carboxylic acid of the formula (2) or an alkali metal salt thereof, the process being characterized in that an aqueous solution of an alkali metal salt of 7-amino-3-[(E/Z)-2-(4-methylthiazol-5-yl)vinyl]-3-cephem-4-carboxylic acid of the formula (1) is treated with a high porous polymer and/or active carbon as added thereto.
摘要:
An improved phenoxyphosphazene compound is produced by treating a phenoxyphosphazene compound with (a) at least one adsorbent selected from activated carbon, silica gel, activated alumina, activated clay, synthetic zeolite and macromolecular adsorbents, (b) at least one reagent selected from metal hydrides, hydrazine, hypochlorites, thiosulfates, dialkyl sulfuric acids, ortho esters, diazoalkanes, lactones, alkanesultones, epoxy compounds and hydrogen peroxide, or (c) both the adsorbent and reagent, thereby reducing the acid value of said phosphazene compound to lower than 0.025 mgKOH/g.
摘要:
This invention provides a halogen-free flame retardant which advantageously has a high melting point and a low volatility and does not impair the inherent properties of resins. The flame retardant of the invention is a phosphazene compound crosslinked with a crosslinking group such as a phenylene group, wherein each of the crosslinking groups is interposed between the two oxygen groups left after the elimination of phenyl groups from the phosphazene compound; the crosslinked phenoxyphosphazene compound does not have any free hydroxyl groups (derived from crosslinking groups); and the amount of the phenyl groups in the crosslinked compound is 50 to 99.9%, based on the total number of the phenyl groups in the phosphazene compound.