Abstract: A driving force transmission device includes drive rollers, roller support portions, and a roller arrangement portion. The drive rollers transmit a driving force to a main wheel. The roller support portions rotatably support the drive rollers. The roller arrangement portion includes a base, an outer frame, and an inner frame. The base expands radially outward with respect to a rotation axis. The outer frame extends in a circumferential direction around the rotation axis and protrudes from the base in an axial direction along the rotation axis. The inner frame is radially inside the outer frame and protrudes from the base in the axial direction. The roller support portions are fitted between the inner circumferential surface of the outer frame and the outer circumferential surface of the inner frame.

Abstract: There are provided a method for producing a transfer structure, in which detachment between a transfer-receiving material and a matrix can be easily achieved without destroying the fine pattern, the transfer pattern of the matrix is satisfactorily transferred to the transfer-receiving material, and the durability of the matrix is maintained for a long time during repeated transfer; and a matrix for use in the method. A film of a silane coupling agent represented by the following formula (I) is formed on a surface of a matrix having a transfer pattern formed on the surface thereof, a transfer-receiving material is applied thereon to transfer the pattern on the surface of the matrix, and the transfer-receiving material is detached from the matrix to obtain a transfer structure formed of the transfer-receiving material.

Abstract: Silane coupling agents which are high in heat resistance, and which are high in durability, releasability, and antifouling properties. The silane coupling agents have a biphenylalkyl group and are represented by the following general formula (1).

Abstract: There are provided a method for producing a transfer structure, in which detachment between a transfer-receiving material and a matrix can be easily achieved without destroying the fine pattern, the transfer pattern of the matrix is satisfactorily transferred to the transfer-receiving material, and the durability of the matrix is maintained for a long time during repeated transfer; and a matrix for use in the method. A film of a silane coupling agent represented by the following formula (I) is formed on a surface of a matrix having a transfer pattern formed on the surface thereof, a transfer-receiving material is applied thereon to transfer the pattern on the surface of the matrix, and the transfer-receiving material is detached from the matrix to obtain a transfer structure formed of the transfer-receiving material.

Abstract: Silane coupling agents which are high in heat resistance, such that no decrease in contact angle is observed even after exposure to an atmosphere having a temperature of 350° C. or higher for 4 hours or longer, and which are high in durability, releasability, and antifouling properties. The silane coupling agents have a biphenylalkyl group and are represented by the following general formula (1). The silane coupling agents are high in heat resistance, such that surfaces modified with these compounds show no decrease in contact angle when exposed to an atmosphere having a temperature of 350° C. or higher for 4 hours or longer, and are high in durability, releasability, and antifouling properties. The silane coupling agents have an extraordinary effect and usefulness. [In the formula (1), Rf represents perfluoroalkyl of F(CF2)n, wherein n is an integer of 1-14, preferably 1-12, more preferably 4-12, and still more preferably 4-10.

Abstract: A fluorine-containing aromatic compound represented by the formula (1) is effectively usable to obtain a magnetic fluid or the like having a wide heat-resistant temperature range and high water resistance ##STR1## wherein X is H, F, Cl, C.sub.1.about.20 alkyl or C.sub.1.about.20 alkoxyl, p is an integer of 1 to 4, Y is --COCH.sub.3, --COOC.sub.2 H.sub.5, --CH(OH)CH.sub.3, --C(CH.sub.3).sub.2 OH, --CH.dbd.CH.sub.2, --C(CH.sub.3).dbd.CH.sub.2, --CAB(CH.sub.2).sub.m Si(CH.sub.3).sub.n Z.sub.3-n, A and B are each H or CH.sub.3, Z is Cl, OCH.sub.3 or OC.sub.2 H.sub.5, and m and n are each 0 or 1, and Rf is C.sub.1.about.20 fluoroalkyl or C.sub.1.about.100 fluoropolyether group.

Abstract: The present invention provides a compound which has a fluoroalkyl group, a lipophilic group (an alkyl group) and a hydrophilic group in the same molecule.