Abstract: An elastic body of this disclosure contains magnetized magnetic powder dispersed in an elastic member, and generates an induced current in a circuit by undergoing an elastic deformation to cause a change in magnetic flux density. The elastic member is an elastomeric foam.

Abstract: An elastic body of this disclosure contains magnetized magnetic powder dispersed in an elastic member, and generates an induced current in a circuit by undergoing an elastic deformation to cause a change in magnetic flux density. The elastic member is an elastomeric foam.

Abstract: The present invention is to provide a bound stopper, which has high mechanical strength, is excellent in durability against fatigue breaking, settling or the like when a heavy load is repeatedly received, and is easy to be produced, in which the bound stopper comprises a polyurethane foam obtained from a polyurethane foam composition containing an isocyanate component and a blowing agent, and the isocyanate component contains a urethane prepolymer having an isocyanate group, the urethane prepolymer being obtained from a polyol component, a polyrotaxane containing a cyclic molecule having an active hydrogen group as a constituent, and an isocyanate.

Abstract: The present invention is to provide a bound stopper, which has high mechanical strength, is excellent in durability against fatigue breaking, settling or the like when a heavy load is repeatedly received, and is easy to be produced, in which the bound stopper comprises a polyurethane foam obtained from a polyurethane foam composition containing an isocyanate component and a blowing agent, and the isocyanate component contains a urethane prepolymer having an isocyanate group, the urethane prepolymer being obtained from a polyol component, a polyrotaxane containing a cyclic molecule having an active hydrogen group as a constituent, and an isocyanate.

Abstract: A polyurethane foam is obtained by reacting raw materials containing a polyisocyanate, a polyol, a water-absorbency-imparting agent, a catalyst, and a blowing agent, foaming the reaction mixture, and curing the foamed product. The polyol is a polyester polyol. The water-absorbency-imparting agent is a polyoxyalkylene compound having a molecular weight of 100 to 1000 and having a hydroxy group at an end of the molecular chain, or an alcohol with 1 to 8 carbon atoms. The amount of the water-absorbency-imparting agent is from 0.5 to 8 parts by mass per 100 parts by mass of the polyester polyol. The polyisocyanate is an aliphatic polyisocyanate, an alicyclic polyisocyanate, or an aromatic polyisocyanate in which the isocyanate groups are not directly attached to an aromatic ring. The foam has a water absorption ratio of 10 to 30 and a color difference ?YI of 7 or less. The time required until water dropped onto a surface of the foam is completely absorbed into the foam is 20 seconds or less.