RUBBER PRODUCT CONTRACTED BY APPLYING ENERGY AND RUBBER PRODUCT LOW IN ALLERGIC PROPERTY

摘要

PROBLEM TO BE SOLVED: To provide a condom which can be used easily. SOLUTION: A rubber material is made of a substance selected from the group consisting of a polyurethane elastomer and its copolymer, a trans- pentenamer and its copolymer, ethylene pimelate and its copolymer, trans- polybutadiene and its copolymer, and synthetic cis-1,4-polyisoprene and its copolymer and has the first shape and size, the second shape and size, and a given transition temperature. When energy equivalent to energy which increases the temperature of the rubber material at least to the transition temperature is applied to the rubber material, the rubber material is contracted from the second shape and size toward the first shape and size.