摘要:
A polyurethane composition comprising a polyurethane and at least one dye selected from the group consisting of metal complex dyes, vat dyes, sulfur dyes and acid dyes. The polyurethane is synthesized by the reaction of a polymeric diol containing a polyoxyethylene chain as a minor proportion, an alicyclic diisocyanate, an alicyclic diamine and hydrazine in particular proportions. This polyurethane composition is little susceptible to deterioration by light and is suitable for use as a component of artificial leather or as a coating material for fabrics.
摘要:
Polyurethane compositions comprising a polyurethane synthesized by reacting a diol, a specific alicyclic diisocyanate, a specific alicyclic diamine and hydrazine or isophthalic acid dihydrazide in specific proportions and a solvent therefor have good solution stability and, when applied as coating compositions, give coats with good light stability, good surface properties, high softening points and sufficient flexibility at low temperatures.
摘要:
A process for producing a novel polyester polyurethane having excellent hydrolysis resistance and excellent flexibility at low temperature, which is obtained from a polyisocyanate and a polyester polyol which is obtained by reaction a dicarboxylic acid with a mixture of 1,9-nonanediol and a polyol represented by the formula ##STR1## wherein R.sup.1 denotes methyl group or ethyl group, R.sup.2 denotes hydrogen atom, methyl group, ethyl group, hydroxymethyl group or hydroxyethyl group, and n is an integer of 1 to 5, said polyester polyol having an average molecular weight of 500 to 30,000.
摘要:
A novel process for production of polyurethane having excellent hydrolysis resistance, heat resistance, low-temperature characteristics and no tendency of crystallization and capability of making high solid content solution, which is obtained from a polymerized polyol having two or more hydroxy groups in the molecule and a polyisocyanate, and optionally a chain extender, characterized in that the polymerized polyol component is a polymerized polyol having ##STR1## groups in the molecule.
摘要:
In the preparation of a polyurethane from a polymeric polyol and an organic polyisocyanate, by using as the polyol a polymeric polyol containing in the molecule thereof 2-methyl-1,8-octanediol residue, a novel polyurethane having excellent resistance to hydrolysis, low temperature characteristics and abrasion resistance can be obtained.
摘要:
A synthetic polyisoprene rubber latex produced by emulsifying a solution of polyisoprene rubber in an organic solvent with water and removing the solvent from the resulting oil-in-water emulsion is significantly improved with respect to mechanical stability, wet gel strength and dry film strength by utilizing, as a polyisoprene rubber, a modified polyisoprene rubber prepared by introducing from about 0.03 to 20 carboxyl groups per 100 recurring units of isoprene monomer present in the synthetic cis-1,4-polyisoprene rubber.
摘要:
A nonvolatile semiconductor memory device according to embodiment includes: a semiconductor substrate having an upper portion being partitioned into a plurality of semiconductor portions extending in a first direction; a charge storage film provided on the semiconductor portion; a word-line electrode provided on the semiconductor substrate and extending in a second direction intersecting with the first direction; and a pair of selection gate electrodes provided on both sides of the word-line electrode in the first direction on the semiconductor substrate and extending in the second direction, a shortest distance between a corner portion of each of the semiconductor portions and each of the selection gate electrodes being longer than a shortest distance between the corner portion of the semiconductor portion and the word-line electrode in a cross section parallel to the second direction.
摘要:
A semiconductor memory device includes a first active region, a second active region, an element isolation region, memory cell transistors. Each of memory cell transistors includes a laminated gate and a first impurity diffusion layer functioning as a source and a drain. The laminated gate includes a first insulating film, a second insulating film, and a control gate electrode. The second insulating film is commonly connected between the plurality of memory cell transistors to step over the element isolation region and is in contact with an upper surface of the element isolation region. An upper surface of the element isolation region is higher than a bottom surface of the first insulating film and is located under the upper surface of the first insulating film.
摘要:
A semiconductor memory device includes gate electrodes extending in a first direction above a surface of a substrate. The semiconductor memory device also includes a reinforcement insulation film formed in a line shape and extending in a second direction crossing the gate electrodes in a plane view viewed from above the surface of the substrate, and connected to adjacent gate electrodes. Further, the semiconductor memory device includes an interlayer dielectric film provided between the adjacent gate electrodes, and having a void inside.
摘要:
A nonvolatile semiconductor memory of an aspect of the invention includes memory cells in the memory cell forming area, and select gate transistors in the select gate forming area. Each memory cell has two first diffusion layers formed in a semiconductor substrate, a first gate insulating film formed on the semiconductor substrate, a charge storage layer formed on the first gate insulating film, a first intermediate insulating film formed on the charge storage layer and a first gate electrode formed on the first intermediate insulating film. Each select gate transistor has two second diffusion layers formed in the semiconductor substrate, a second gate insulating film formed on the semiconductor substrate, a second intermediate insulating film formed in direct contact with the second gate insulating film and having the same structure as the first intermediate insulating film, and a second gate electrode formed on the second intermediate insulating film.