摘要:
A laser surface treatment for reducing reflection loss on the surface of an optical material is provided. A metal film is formed on the surface of the optical material, and then the metal film is removed from the optical material by irradiation of an ultra-intense short-pulse laser beam having a pulse width of 1 femtosecond to 100 picoseconds, so that a fine periodic structure is formed on the surface of the optical material exposed by the removal of the metal film. The obtained fine periodic structure has asperities with a periodic interval of preferably 50 to 1000 nm, which can be controlled by changing the laser energy density.
摘要:
Processes for producing an AB block copolymer, an ABA block copolymer or a multiblock copolymer are provided, which comprises adding an alkenyl-containing polymer (I) to a living or to an atom transfer radical polymerization system or a living cationic polymerization system.
摘要:
When a lens holder 2A is in a neutral position, a ratio of a gap between opposing surfaces of one tilt magnet 10a, 10b and one tilt coil 5 which oppose to each other, to a radial direction thickness of the tile magnet 10a, 10b, is in the range of 1/2 to 1/3. In at least one tilt coil of the tilt coils, a ratio of a light axis direction inside distance of the tilt coil to a light axis direction height of the tilt magnet, is in the range of 1/1.5 to 1/4. With this arrangement, even if the objective lens is shifted in a tracking direction or in a focusing direction, variation in the sensitivity and the linearity of the radial tilt movement is small, and an internally accessible area is increased.
摘要:
Poly (ethylene-co-C4-C20-alkene) copolymers or segments with polydispersities less than 1.3 and/or predominantly enchainment in a cis-1,2 fashion and/or poly(ethylene-co-C4-C20 monocyclic alkene) copolymers or segments provide in some cases substitutes for ultra high molecular weight polyethylenes and in some cases substitutes for polypropylenes and in some cases utility as gas barrier coatings.
摘要:
An objective lens driving apparatus for an optical head is disclosed which exerts a high thrust in focusing and radial directions with reduced power consumption and suppresses vibration by a rolling mode of a lens holder even when a focused position of an objective lens is shifted thereby to achieve a good reproduction characteristic. Each of a pair of magnets for forming magnetic fields necessary for causing a focusing coil and tracking coils to generate electromagnetic forces is magnetized so as to have three poles including a centrally located N pole and a pair of opposite side S poles in the radial or tracking direction. Each of the tracking coils is disposed such that the two opposite sides thereof in the radial direction are opposed separately to the N and S poles so that a thrust or electromagnetic force of a magnitude substantially equal to twice is generated in the radial direction. The permanent magnets have a length in the direction of the optical axis greater than that of the tracking coil so that the magnetic intensity is uniformed and the rolling mode of the objective lens is suppressed. The boundary portions of the three poles are positioned on the outer sides of yokes so that the thrust (or electromagnetic force for the focusing coil is increased.
摘要:
There are provided (1) a process for producing a solid product, which comprises the step of reducing a titanium compound represented by the following formula [I] with an organomagnesium compound in the presence of an organosilicon compound having an Si—O bond, an inorganic fine particle and optionally an ester compound, (2) a process for producing a solid catalyst component, which comprises the step of contacting the solid product obtained by the above process, a halogenation ability-carrying halogeno compound, and an inner electron donor compound, (3) a process for producing a catalyst, which comprises the step of contacting the solid catalyst component obtained by the above process, an organoaluminum compound, and an outer electron donor compound, and (4) a process for producing an olefin polymer, which comprises the step of polymerizing an olefin in the presence of the catalyst obtained by the above process.
摘要:
This invention provides method of producing a polymer which comprises substitution of carboxylic acid group for a terminal halogen group of a polymer obtainable by atom transfer radical polymerization. The carboxylic acid group may be a carboxylic acid salt group, more preferably a carboxylic acid potassium salt group. In carrying out the atom transfer radical polymerization in the practice of the invention, a transition metal complex can be used as a polymerization catalyst. The transition metal complex may be a transition metal complex with an element of the group 7, 8, 9, 10 or 11 of the periodic table as the central atom, more preferably a copper, nickel, ruthenium or iron complex and, in particular, a copper complex is used. The polymer obtainable by atom transfer radical polymerization is obtained by polymerization of a (meth)acrylic monomer, particularly the polymer obtained by polymerization of an acrylic acid ester monomer.
摘要:
An olefin polymer of an alkenyl hydrocarbon having 5 or more carbon atoms, wherein said olefin polymer is an amorphous polymer having a Mn of 300,000 and a Mw/Mn of 2.40 or less, and substantially not having a melting point, and a process for producing said olefin polymer which comprises polymerizing an alkenyl hydrocarbon having 5 or more carbon atoms with an olefin polymerization catalyst obtained by contacting: a specific transition metal compound(A), an organoaluminumoxy compound (B) soluble in an aromatic solvent and water (C).
摘要:
A curable composition which comprises the following two components: (I) a vinyl polymer having at least one crosslinkable silyl group represented by the general formula (1) given below, and (II) an epoxy resin or a polyether polymer having at least one crosslinkable silyl group; —[Si(R1)2−b(Y)bO]m—Si(R2)3−a(Y)a (1) {wherein R1 and R2 each represents an alkyl group containing 1 to 20 carbon atoms, an aryl group containing 6 to 20 carbon atoms, an aralkyl group containing 7 to 20 carbon atoms, or a triorganosiloxy group represented by the formula (R′)3SiO— (in which R′ represents a monovalent hydrocarbon group containing 1 to 20 carbon atoms and the three R's may be the same or different) and, when there are two or more R1 or R2 groups, they may be the same or different; Y represents a hydroxy group or a hydrolyzable group and, when there are two or more Y groups, they may be the same or different; a represents 0, 1, 2 or 3; b represents 0, 1 or 2; and m represents an integer of 0 to 19; with the condition that a, b and m satisfy the relation a+mb≧1}.
摘要:
A pressure sensitive adhesive composition which comprises the following two components: (A) a vinyl polymer having at least one alkenyl group represented by the general formula (1): CH2═C(R1)— (1) wherein R1 represents a hydrogen atom or a methyl group; (B) a hydrosilyl group-containing compound is provided. The composition can give cured products having a high gel fraction and can be cured rapidly since the degree of alkenyl group introduction is high.