A polymeric product with at least one surface subject to wear or abrasion, at least a portion of which product includes microcapsules of an indicator substance which is released to indicate a state of wear has been reached. The microencapsulated indicator substance may be a fragrance or a colorant. The indicating portion or zone may be a layer or a thin sheet of microcapsules in rubber or in the polymeric material making up the body of the product. There may be more than one indicating layer or zone in the product. The various zones may contain different fragrances or colorants, which may provide progressive indication of the state of wear.

The present invention relates to an article having an elastic main body based on at least one thermoplastic elastomer or based on a vulcanizate having an article surface provided with a textile cover ply, characterized in that the textile cover ply is treated with partially oxidized polyethylene, and to processes for producing such an article.

The present invention relates to a wrapped V-belt including: a tension member layer including a tension member; a tension rubber layer laminated on the tension member layer at a belt outer peripheral side; a compression rubber layer laminated on the tension member layer at a belt inner peripheral side; and an outside cloth covering an entire outer surface of the belt, in which the compression rubber layer includes a first compression rubber layer laminated at the belt outer peripheral side and a second compression rubber layer laminated at the belt inner peripheral side, and the tension rubber layer has a rubber hardness that is higher than a rubber hardness of the second compression rubber layer and lower than a rubber hardness of the first compression rubber layer.

A power transmission V-belt includes a tension member, an adhesion rubber layer in which at least part of the tension member is embedded, and a tension rubber layer and a compression rubber layer stacked via the adhesion rubber layer. A rubber hardness of the tension rubber layer is smaller than a rubber hardness of the compression rubber layer. In the adhesion rubber layer, a rubber hardness on a tension rubber layer side relative to the tension member is smaller than a rubber hardness on a compression rubber layer side.

An uncrosslinked rubber shaped structure for belt production is placed in a belt mold with the uncrosslinked rubber shaped structure having a bent portion that is bent inward. A space inside the uncrosslinked rubber shaped structure is partitioned into a first space and a second space. The first space corresponds to a first shaped structure portion of the uncrosslinked rubber shaped structure, the first shaped structure portion including the bent portion. The second space corresponds to a second shaped structure portion of the uncrosslinked rubber shaped structure that is a portion of the uncrosslinked rubber shaped structure except the first shaped structure portion. An expansion member is expanded in the second space to press the second shaped structure portion toward the belt mold.

A frictional power-transmission belt having a frictional power-transmission surface covered with a composite fiber layer, in which the composite fiber layer includes a fiber member and an isocyanate compound, and the fiber member includes a cellulose-based fiber. In the frictional power-transmission belt, the isocyanate compound may have a proportion of 3 to 20 mass % in the composite fiber layer.

The present invention relates to a process for adhering a textile material to an elastomer, the process comprising the steps of pretreating the textile material with at least one polyester of an --unsaturated carboxylic acid, contacting the pretreated textile material with an unvulcanized elastomer, and vulcanizing the product obtained. The present invention additionally encompasses an elastomer article obtainable by this process and also the use of a polyester of an --unsaturated carboxylic acid for improving the adhesion of a textile material to an elastomer.

A wrapped V-belt includes: a belt main body containing a compression layer containing a compression rubber layer and a fabric-laminated body layer a tension rubber layer and a tension member buried between the compression layer and the tension rubber layer; and an outside cloth that covers a periphery of the belt main body, in which the compression layer has a plurality of notch portions not covered with the outside cloth, and the notch portion has a top disposed in the fabric-laminated body layer.

A toothed belt is provided with toothed portions arranged at a regular pitch in a belt length direction. A belt body is made of a rubber composition containing, as a main ingredient of a rubber component, ethylene--olefin elastomer having an ethylene content of 44% by mass to 66% by mass. A reinforcing fabric is adhered to a surface of the belt body on a toothed side, with a reinforcing fabric adhesion coat interposed between the reinforcing fabric and the belt body. The reinforcing fabric adhesion coat is made of a rubber composition containing hydrogenated nitrile-butadiene rubber as a main ingredient of a rubber component.

A V-ribbed belt includes a compression rubber layer containing a vulcanizate of a rubber composition, a tension member, and a tension layer, and has a side part of the compression rubber layer being a ground surface coming into contact with pulleys, and a bottom part of the compression rubber layer being a non-ground surface not coming into contact with pulleys. The V-ribbed belt has, on a surface of the bottom part, a composite layer containing a fiber assembly and a vulcanizate. The fiber assembly contains a heat-resistant fiber which is not melted at a vulcanization temperature of the rubber composition and has a weight per unit area of 25 g/m.sup.2 or less. The vulcanizate of the rubber composition impregnated among fibers of the fiber assembly.