摘要:
A polyurethane having excellent elastic recovery is obtained by reacting an organic diisocyanate with a polycaprolactone polyester-diol prepared from a dihydric alcohol, a dibasic acid, an ester thereof or an anhydride thereof and .epsilon.-caprolactone or/and hydroxycaproic acid and having a hydroxyl value of 35 to 150 KOH mg/g and a content of .epsilon.-caprolactone and hydroxycaproic acid of 69 to 95% by weight.
摘要:
A process for producing a lactone polymer which comprises reacting an ester compound synthesized from an alcohol and an acid or acid anhydride thereof with a lactone and a ring-opening polymerization initiator without being accompanied by condensation. The thus produced lactone polymer is effective for preventing shrinkage of thermosetting resins, particularly unsaturated polyester resins.
摘要:
A process for producing a lactone polymer which comprises reacting an ester compound synthesized from an alcohol and an acid or acid anhydride thereof with a lactone and a ring-opening polymerization initiator without being accompanied by condensation. The thus produced lactone polymer is effective for preventing shrinkage of thermosetting resins, particularly unsaturated polyester resins.
摘要:
A polyurethane comprises (a) organic diisocyanate units and (b) polycaprolactone polyol units having a narrow molecular weight distribution in which a ratio of the weight average molecular weight to the number average molecular weight is in the range of from 1.1 to 2.0 and the average molecular weight is 500 to 5,000, the units (a) and (b) being connected linearly through urethane linkages.
摘要:
A polyol resin is disclosed which is obtained by reacting 95 to 40% by weight of an aromatic vinyl monomer-allyl alcohol copolymer with 5 to 60% by weight of .epsilon.-caprolactone or .epsilon.-hydroxycaproic acid. The polyol resin can be reacted with a crosslinking agent to form a coating film.
摘要:
A lactone polymer has a narrow molecular weight distribution where a ratio of the weight average molecular weight to the number average molecular weight is in the range of from 1.1 to 2.0 and the molecular weight is 500 to 5,000.
摘要:
Disclosed is a milling and classifying apparatus, adapted to produce toner fine particles, comprising a collision mill, and an air classifier, wherein the collision mill comprises a jet nozzle room, a path, a collision plate, and a collision member mounted to a support of the collision plate at downstream of the collision plate, the air classifier comprises a dispersion room and a classification room, the classification room is disposed below the dispersion room, and a flow stabilizer is arranged at a central suction of the separator core to control swirl stream generated within the classification room so as to centrifuge the powder into coarse particles and fine particles by action of the swirl stream.
摘要:
A multilayer wiring substrate for a semiconductor having a rectangular coaxial wiring structure and a method of fabrication thereof are disclosed, in which a wiring substrate of high density, and free of crosstalk, can be fabricated by press work using a die. A semiconductor wiring substrate comprises an insulating base substrate (2), a first metal layer (3) formed on the base substrate, a plurality of signal patterns (30) formed on the first metal layer through a dielectric layer (5), a second metal layer (36) formed on the signal patterns through a dielectric layer (31), and metal vias (29, 37) for partitioning the adjacent signal patterns (30) through a dielectric layer. The die is used to form the signal patterns and the vias.
摘要:
A camera has a camera body. A taking lens is disposed at a front face of the camera body, for introducing object light. A grip portion is disposed in the camera body and lower than the taking lens, and adapted to holding of the camera body. A release button is adapted for recording the object light from the taking lens by being depressed, and is disposed between the taking lens and the grip portion. In a preferred embodiment, the release button has a depression surface inclined with reference to the front face of the camera body. Furthermore, an instant photo film chamber is formed in the camera body, disposed behind a central portion of the front face, and contains an instant photo film. A printer unit with an exposure head records an image to the instant photo film.
摘要:
A method for causing a neural circuit model to learn typical past control results of a process and using the neural circuit model for supporting an operation of the process. The neural circuit model is caused to learn by using, as input signals, a typical pattern of values of input variables at different points in time and, as a teacher signal, its corresponding values of the control variable. An unlearned pattern of input variables is inputted to the thus-learned neuron circuit model, whereby a corresponding value of the control variable is determined. Preferably, plural patterns at given time intervals can be simultaneously used as patterns to be learned.