Abstract: A phosphorus-atom-containing oligomer is used as a curing agent for epoxy resin, the phosphorus-atom-containing oligomer being a mixture of a phosphorus-atom-containing compound represented by structural formula (1) below with n representing 0 and a phosphorus-atom-containing oligomer represented by structural formula (1) below with n representing 1 or more: (where R1 to R5 each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or the like; X represents a hydrogen atom or a structural unit represented by structural formula (x1) below: where, in structural formula (x1), R2 to R5 each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or the like), wherein a content of the phosphorus-atom-containing oligomer represented by general structural formula (1) with n representing 1 or more is in the range of 5 to 90% on a peak area bases in GPC measurement.

Abstract: In the fields of printed wiring boards and circuit boards, a good glass cloth-penetrating property is exhibited and prepreg appearance is excellent. A cured product thereof exhibits good heat resistance. A phenolic resin is a phosphorus-atom-containing phenolic resin that has phosphorus-atom-containing structural portions (i) represented by structural formula (Y1) or (Y2) below and alkoxymethyl groups (ii) in an aromatic nucleus of a phenolic compound: (In structural formulae (Y1) and (Y2), R1 to R4 each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms). A ratio of the number of the alkoxymethyl groups (ii) relative to the total number of the phosphorus-atom-containing structural portions (i) and the alkoxymethyl groups (ii) is 5 to 20%.

Abstract: An outer side rib 46 is formed at a side relative to the plural circumference direction main grooves that is at the vehicle outer side when the tire is mounted at a vehicle. A land portion of the outer side rib 46 is continuous in the tire circumference direction. Of the plural circumference direction main grooves, an outermost side circumference direction main groove 24 is formed at the vehicle outermost side when the tire is mounted. Fourth lug grooves 42 extend from the outermost side circumference direction main groove 24 toward the outer side rib 46. The groove width of each fourth lug groove 42 widens from the outermost side circumference direction main groove 24 side toward the outer side rib 46 side. The fourth lug grooves 42 terminate at the outermost side circumference direction main groove 24 side relative to a tire ground contact edge 16E.

Abstract: A tire with sufficient braking performance on dry and wet roads, reduced rolling resistance and abrasion resistance. Tread 12 has first circumferential direction groove 14 and first fine grooves 18 with wall faces that contact each other when the tread 12 contacts the ground, the grooves 14 and 18 partitioning center ribs 16. Center blocks 24 are partitioned by second circumferential direction grooves 20 outside the grooves 18 and center lug grooves 22 extending from respective groove 18 to respective groove 20. First sipes 40 are formed in the center blocks 24 extending circumferentially from wall face 24B toward wall face 24C and terminating within the block. Second sipes 42 are formed in the surface of center blocks 24 extending circumferentially from wall face 24C toward wall face 24B, and curving around before reaching wall face 24B, being open to wall face 24A, and not intersecting first sipes 40.

Abstract: A phosphorus-atom-containing oligomer is used as a curing agent for epoxy resin, the phosphorus-atom-containing oligomer being a mixture of a phosphorus-atom-containing compound represented by structural formula (1) below with n representing 0 and a phosphorus-atom-containing oligomer represented by structural formula (1) below with n representing 1 or more: (where R1 to R5 each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or the like; X represents a hydrogen atom or a structural unit represented by structural formula (x1) below: where, in structural formula (x1), R2 to R5 each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or the like), wherein a content of the phosphorus-atom-containing oligomer represented by general structural formula (1) with n representing 1 or more is in the range of 5 to 90% on a peak area basis in GPC measurement.

Abstract: A tire 1 according to the present invention comprises: a circumferential groove 12 formed in a tread portion; a land portion 22 divided by the circumferential groove 12; and transverse grooves formed in the land portion. The transverse grooves comprise a first transverse groove 32 dividing the land portion into several blocks, and a second transverse groove 51 dividing a block 42 divided by the first transverse groove into a first block portion 61 and a second block portion 62. A groove depth of the circumferential groove contacting the second block is smaller than the groove depth of the circumferential groove contacting the first block.

Abstract: The present invention provides a tire capable of effectively enhancing the visibility of marks. The tire is provided with a mark 3 on a surface of a side portion 1, in which the mark 3 is formed so as to vary at least one of the hue, brightness and saturation.

Abstract: Provided is a pneumatic tire with an annular decoration band and one or more marks on the outer surface of a tire side portion, wherein high visibility of the marks is maintained without detracting from the appearance of the tire, while the manufacturing costs of the vulcanization mold are reduced. The pneumatic tire of the present invention is provided with an annular decoration band (8), formed from a plurality of ridges (8a), and one or more marks (9) constituted by a predetermined character, symbol or design, on an outer surface (7a) of a tire side portion (7). The decoration band (8) is disposed to extend both inward and outward in the tire radial direction from a position corresponding to a turn back end (5c) of a carcass. The width of the decoration band (8) is narrower than a maximum length of the marks (9) in the tire radial direction.

Abstract: The present invention provides a tire having a plurality of ridges 3 arranged in an annular form on a surface of a side portion 2 of a tire 1. A color line 5 is formed to extend in an annular space situated on an inner peripheral side from a region 4 where the ridges are arranged and radially inward from a tire maximum width position p.

Abstract: In a pneumatic tire 10, inclined grooves 120, 170 are formed, the groove 120 with groove depth becoming larger and groove width in circumferential-direction becoming smaller as the groove 120 extends toward the inner side in width—direction, the groove 170 with groove depth becoming larger and groove width in the circumferential-direction becoming smaller as the groove 170 extends toward the outer side in the width-direction.. An outer end portion of the groove 120 in the width—direction is continuous with a land portion 110 and an inner end portion of the groove 120 in the width-direction extends toward circumferential groove 22 along an end portion of a land portion 160 in the circumferential-direction. An inner end portion of the groove 170 in the width-direction is continuous with the land portion 160 and the groove 170 extends along an inner end portion of the land portion 110 in the width-direction.

Abstract: A pneumatic tire 1 according to the present invention comprises at least land portion formed by circumferential groove 3,5 extending in circumferential-direction. The land portion includes land portion 11 having groove side wall 17 forming the circumferential groove 3 and land portion 15 having groove side wall 19A forming the circumferential groove 3. The groove side wall 17 and the groove side wall 19A meander in the circumferential-direction in surface view. A groove width of the circumferential groove 3 in width-direction changes in predetermined cycles in the circumferential-direction. The land portion 15 includes wide land portion in which width of the land portion in the width-direction is predetermined width, and narrow land portion in which the width in the width-direction is narrower than the predetermined width. A surface of the wide land portion is provided with recess portion 23 recessed inward in radial-direction from surface of the land portion 15.

Abstract: First, wood or bamboo is crushed to obtain wood powder with an average grain size of 5 ?m to 100 ?m. Next, the wood powder is put in a first mold, and a first compression molding step is carried out under the conditions that, for example, a temperature is 160° C. and a pressure is 30 MPa. Thus, a temporary molded body is obtained. Subsequently, the temporary molded body is immersed in a flame retardant and a surface of the temporary molded body is impregnated with the flame retardant. Thereafter, the temporary molded body is put in a second mold, and a second compression molding step is carried out under the conditions that, for example, a temperature is 200° C. and a pressure is 100 MPa. At this time, ingredients such as lignin and a hemicellulose are separated from the wood powder, and function as an adhesive. For this reason, pieces of crushed material are firmly bonded with each other so as to be integrated into a single body. Thus, a compression-molded product with a predetermined shape is obtained.