Abstract: A perfluoropolyether-polyorganosiloxane copolymer comprising at least one perfluoropolyether block, at least one polyorganosiloxane block which may has a silalkylene group, and two monovalent groups represented by the following formula (1), each one at both ends of the copolymer, wherein X is a hydrolyzable group, R1 is an alkyl group having 1 to 4 carbon atoms or a phenyl group, y is an integer of from 1 to 5, and a is an integer of 2 or 3, said copolymer having a number average molecular weight, reduced to polystyrene, of from 7,000 to 25,000.

Abstract: The present invention relates to a perfluoropolyoxyalkylene group-containing polymer represented by the following formula (1), wherein Rf is a group having a perfluoropolyoxyalkylene group; W1 is a divalent organosiloxane group having at least one group represented by the following formula (2); W2 is a monovalent group selected from an alkyl group, an alkenyl group, an alkenyloxyalkyl group, an aryl group and an organosiloxane group represented by the following formula (3), and the combinations thereof, the monovalent group having 1 to 300 carbon atoms and being optionally substituted with one or more fluorine atoms; Q is, independently of each other, a divalent linking group having 2 to 12 carbon atoms, optionally containing one or more oxygen atoms, nitrogen atoms, or fluorine atoms; and p is an integer of from 1 to 20, wherein X is a hydrolysable group; R1 is an alkyl group having 1 to 4 carbon atoms or a phenyl group; y is an integer of from 1 to 5; and a is 2 or 3, wherein, R2 a

Abstract: An object of the present invention is to provide a fluorooxyalkylene group-containing polymer composition, which yields a coating having excellent adhesior to a substrate, good water- and oil-repellency, a low dynamic friction coefficient, good releasing property, good abrasion resistance and good stain resistance, and to provide a surface treatment agent comprising the same. The present inventors have found that a composition comprising a fluorooxyalkylene group-containing polymer having a fluorinated group and a hydrolyzable group at each terminal and a fluorooxyalkylene group-containing polymer having hydrolyzable groups at both terminals can form a coating which has excellent water- and oil-repellency, a low dynamic friction coefficient, good releasing property, good abrasion resistance, and good stain resistance.

Abstract: A light control element is provided with a thin board having electro-optical effects; an optical waveguide formed on the thin board; and a control electrode for controlling light that passes through the optical waveguide. The light control element performs speed matching between a microwave signal applied to the control electrode and the light, impedance matching of the microwaves, reduction of a driving voltage and high speed operation. In the control electrode of the light control element, a signal electrode and a grounding electrode are arranged on an upper side of the thin board, and on a lower side of the thin board, a second electrode including the grounding electrode is arranged. The second electrode is arranged not to exist below the signal electrode, especially for achieving impedance matching.

Abstract: The present invention relates to a photo-curable perfluoropolyether group-containing acrylate compound represented by the following formula (1): X1—[Z—Rf—Z—X2]v—Z—Rf—Z—X1??(1) wherein Rf is a divalent perfluoropolyether group; X1 is a group represented by the following formula (2): R2 is a group represented by the following formula (4): X2 is a group represented by the following formula (5): and Z is a divalent organic group.

Abstract: A coating composition comprising (A) at least one fluorine-containing organosilicon compound represented by the following formula (1) or (2) Rf1-QZ1A? (1) A?Z1Q-Rf2-(Q-Z2-Q-Rf2)x-QZ1A? (2) and (B) a fluorine-containing carboxylic acid having a number average molecular weight of from 100 to 10,000 and a fluorine content of at least 25 wt %, wherein an amount of (B) ranges from 0.001 to 10 parts by weight per 100 parts by weight of the component (A) wherein the amount of (B) ranges from 0.001 to 10 parts by weight per 100 parts by weight of the component (A), wherein the composition can be cured rapidly even at room temperature to produce water-repellent and antifouling coatings.

Abstract: A perfluoropolyether-polyorganosiloxane block copolymer represented by the following formula (1), the block copolymer having a number average molecular weight, reduced to polystyrene, of from 2,000 to 20,000, W2-Q-Rf-Q-(W1-Q-Rf-Q)g-W2??(1) wherein Rf is a perfluoropolyether block, W1 is a polyorganosiloxane block having at least one group represented by the following formula (2) wherein X is a hydrolyzable group, R1 is a C1-4 alkyl group or a phenyl group, y is an integer of from 1 to 5, and a is 2 or 3, Q is a C2-12 divalent connecting group which may contain an oxygen atom and/or nitrogen atom, W2 is an organosiloxane residue having a group represented by the aforesaid formula (1), and g is an integer of from 1 to 11.

Abstract: An organopolysiloxane represented by the following general formula (A), (B) or(C) SinR12n+2On?1??(A) SinR12nOn??(B) SinR12n+2R2kOn?k??(C) wherein R1 may be the same with or different from each other and is a hydrogen atom or a monovalent organic group, R2 is an alkylene group having 2 to 6 carbon atoms, n is an integer of from 2 to 40 and k is an integer of 1 to 3, characterized in that at least two R1's are represented by the following formula (i): wherein X is a hydrolyzable group, R3 is an alkyl group having 1 to 4 carbon atoms or a phenyl group, y is an integer of from 1 to 5 and a is 2 or 3; and one SiOSi bond is replaced with a bond represented by the following formula (iii): SiQRf2QSi??(iii) wherein Rf1 is a monovalent group containing a perfluoroether residue, Rf2 is a divalent group containing a perfluoroether residue, and Q is a divalent organic group.

Abstract: The purpose of the present invention is to provide a surface treating agent which provides a surface where stain does not easily adheres, does not stand out and is easily wiped off. The present invention is a perfluoropolyether group-containing polyorganosiloxane represented by the following formula (1) and a surface treating agent comprising the same, Ak(R)nZ-Q-Rf-Q-Z(R)nAk??(1) wherein Rf is a divalent perfluoropolyether group; Q is a divalent group linking Rf with Z; Z is a polyorganosiloxane group having at least three siloxane bonds with its valency being trivalent to hendecavalent; R is a monovalent organic group having 8 to 40 carbon atoms, n is an integer of from 1 to 8; A is a group represented by the following formula (2); and k is an integer of from 1 to 9, provided that a total of n+k=the valency of Z?1 wherein R? is an alkyl group having 1 to 4 carbon atoms or a phenyl group; X is a hydrolysable group, a is 2 or 3; and b is an integer of from 2 to 10.

Abstract: The present invention relates to a perfluoropolyoxyalkylene group-containing polymer represented by the following formula (1), wherein Rf is a group having a perfluoropolyoxyalkylene group; W1 is a divalent organosiloxane group having at least one group represented by the following formula (2); W2 is a monovalent group selected from an alkyl group, an alkenyl group, an alkenyloxyalkyl group, an aryl group and an organosiloxane group represented by the following formula (3), and the combinations thereof, the monovalent group having 1 to 300 carbon atoms and being optionally substituted with one or more fluorine atoms; Q is, independently of each other, a divalent linking group having 2 to 12 carbon atoms, optionally containing one or more oxygen atoms, nitrogen atoms, or fluorine atoms; and p is an integer of from 1 to 20, wherein X is a hydrolysable group; R1 is an alkyl group having 1 to 4 carbon atoms or a phenyl group; y is an integer of from 1 to 5; and a is 2 or 3, wherein, R2 a

Abstract: A perfluoropolyether-polyorganosiloxane block copolymer represented by the following formula (1), the block copolymer having a number average molecular weight, reduced to polystyrene, of from 2,000 to 20,000, W2-Q-Rf-Q-(W1-Q-Rf-Q)g-W2??(1) wherein Rf is a perfluoropolyether block, W1 is a polyorganosiloxane block having at least one group represented by the following formula (2) wherein X is a hydrolyzable group, R1 is a C1-4 alkyl group or a phenyl group, y is an integer of from 1 to 5, and a is 2 or 3, Q is a C2-12 divalent connecting group which may contain an oxygen atom and/or nitrogen atom, W2 is an organosiloxane residue having a group represented by the aforesaid formula (1), and g is an integer of from 1 to 11.

Abstract: A coating composition comprising a fluorine-containing silicon compound represented by the following formula (1) wherein Z is a linear or branched divalent polyorganosiloxane residue having 1 to 40 siloxane units, R is an alkyl group having 1 to 4 carbon atoms or a phenyl group, X is a hydrolyzable group, Q is a C2-12 divalent connecting group, a is an integer of 2 or 3, b is an integer of from 1 to 10, y is an integer of 1 to 5, and Rf is a group represented by the following formula (2) -Rf1-(Q-W-Q-Rf1)q- ??(2) wherein Rf1 is a perfluoropolyether residue, W is an organopolysiloxane residue having 1 to 40 siloxane units and Q is as defined above and may be the same with or different from each other, and q is an integer of from 0 to 3, and at least one solvent selected from the group consisting of alcohols, esters, ethers, ketones, and perfluoroethers. The coating prepared from the composition is oil-repellent, water-repellent and has water sliding property.

Abstract: The present invention offers an optical modulator capable of efficiently transmitting electric signals to an interaction part of a signal electrode with acting on an optical waveguide even when the electric signals are in a high frequency zone, and capable of performing high frequency broad-band operation. The optical modulator comprises a substrate 1 formed of a material having electro-optical effect, an optical waveguide formed on the substrate, and an electrode 3 for modulating the light passing through the optical waveguide.

Abstract: A coating composition comprising (A) at least one fluorine-containing organosilicon compound represented by the following formula (1) or (2) and Rf1-QZ1A? ??(1) A?Z1Q-Rf2-(Q-Z2-Q-Rf2)x-QZ1A? ??(2) (B) a fluorine-containing carboxylic acid having a number average molecular weight of from 100 to 10,000 and a fluorine content of at least 25 wt %, wherein an amount of (B) ranges from 0.001 to 10 parts by weight per 100 parts by weight of the component (A). The composition can be cured rapidly even at room temperature to produce water-repellent and antifouling coating.

Abstract: A perfluoropolyether-polyorganosiloxane copolymer comprising at least one perfluoropolyether block, at least one polyorganosiloxane block which may has a silalkylene group, and two monovalent groups represented by the following formula (1), each one at both ends of the copolymer, wherein X is a hydrolyzable group, R1 is an alkyl group having 1 to 4 carbon atoms or a phenyl group, y is an integer of from 1 to 5, and a is an integer of 2 or 3, said copolymer having a number average molecular weight, reduced to polystyrene, of from 7,000 to 25,000.

Abstract: An optical modulator restricted in a photorefractive phenomenon caused by a stray light in an optical modulator, and improved in the quenching ratio characteristics of a signal light. The optical modulator comprises a substrate consisting of a material having an electro-optic effect, an optical waveguide formed on the substrate, and a modulating electrode for allowing an electric field to work on the optical waveguide and changing the phase of light passing through the optical waveguide, characterized in that stray light removing means are provided on the surface of the substrate.

Abstract: An organopolysiloxane represented by the following general formula (A), (B) or (C) SinR12n+2On?1??(A) SinR12nOn??(B) SinR12n+2R2kOn?k??(C) wherein R1 may be the same with or different from each other and is a hydrogen atom or a monovalent organic group, R2 is an alkylene group having 2 to 6 carbon atoms, n is an integer of from 2 to 40 and k is an integer of 1 to 3, characterized in that at least two R1's are represented by the following formula (i): wherein X is a hydrolyzable group, R3 is an alkyl group having 1 to 4 carbon atoms or a phenyl group, y is an integer of from 1 to 5 and a is 2 or 3; and one SiR1 bond is represented by the following formula (ii) or one SiOSi bond is replaced with a bond represented by the following formula (iii): SiQRf1??(ii) SiQRf2QSi??(iii) wherein Rf1 is a monovalent group containing a perfluoroether residue, Rf is a divalent group containing a perfluoroether residue, and Q is a divalent organic group.

Abstract: An optical modulator restricted in a photorefractive phenomenon caused by a stray light in an optical modulator, and improved in the quenching ratio characteristics of a signal light. The optical modulator comprises a substrate consisting of a material having an electro-optic effect, an optical waveguide formed on the substrate, and a modulating electrode for allowing an electric field to work on the optical waveguide and changing the phase of light passing through the optical waveguide, characterized in that stray light removing means are provided on the surface of the substrate.

Abstract: Present invention offers an optical modulator capable of efficiently transmitting electric signals to an acting portion of a signal electrode with acting on an optical waveguide even when the electric signals are in high frequency zone, and capable of performing high frequency broad band operation. The optic modulator comprises a substrate 1 formed of a material having electro-optical effect, an optical waveguide formed on the substrate, and an electrode 3 for modulating the light passing through the optical waveguide. The optical modulator is characterized in that an electric signal connection pad unit 6 is provided on a part of the electrode, and in that the thickness of the substrate which is located at least on a lower part of the electric signal connection pad unit 6 and directly or indirectly continuous to the electric signal connection pad unit 6 is thinner than the thickness of other parts of the substrate.

Abstract: A hair dryer including a main body, a centrifugal fan, at least one air inlet and at least one inlet guide. The main body has an air outlet. The centrifugal fan is provided in the main body and configured to blow air toward the air outlet. The centrifugal fan has an intake side and an outer circumferential surface around a central axis of the centrifugal fan. The at least one air inlet is formed in the main body to face the intake side of the centrifugal fan. The at least one inlet guide is provided to project from an inside surface of the main body and extends along a circumference of the at least one air inlet to surround and face a part of the outer circumferential surface of the centrifugal fan along a circumference of the centrifugal fan.