Abstract: A resin molded article which is a molded article obtained by irradiating a resin molded article containing 100 to 60 parts by weight of (A) syndiotactic 1,2-polybutadiene having a crystallinity of 5% or more and 0 to 40 parts by weight of (B) another thermoplastic polymer with an electron beam, in which the 50% stress of the molded article after the electron beam irradiation (50% M:M2) is from 1.01 to 2.5 times the 50% stress before the electron beam irradiation (50% M:M1), and the molded article has steam sterilization resistance. The molded article is excellent in flexibility and hardness, excellent in steam sterilization resistance, and useful for medical applications such as an infusion tube, an infusion solution container, a catheter and the like.

Abstract: To improve the joining (adhesion) force of a polybutadiene formed article and a polar resin formed article, and to further improve the joining force by selecting (combining) a solvent(s) for these formed articles. A method for adhering a polybutadiene formed article, which comprises (1) the step of reducing the water contact angle of a surface of the polybutadiene formed article by ozone treatment, electron beam treatment, corona discharge treatment, plasma discharge treatment, ultraviolet laser treatment or chemical treatment, and (2) the step of adhering the polybutadiene formed article reduced in the water contact angle to a polar resin formed article.

Abstract: A resin molded article which is a molded article obtained by irradiating a resin molded article containing 100 to 60 parts by weight of (A) syndiotactic 1,2-polybutadiene having a crystallinity of 5% or more and 0 to 40 parts by weight of (B) another thermoplastic polymer with an electron beam, in which the 50% stress of the molded article after the electron beam irradiation (50% M:M2) is from 1.01 to 2.5 times the 50% stress before the electron beam irradiation (50% M:M1), and the molded article has steam sterilization resistance. The molded article is excellent in flexibility and hardness, excellent in steam sterilization resistance, and useful for medical applications such as an infusion tube, an infusion solution container, a catheter and the like.

Abstract: Disclosed are a medical member having a tube mainly containing syndiotactic 1,2-polybutadiene having a crystallinity of 5% or more and a connecting member such as a connector connected thereto, the connecting member mainly containing syndiotactic 1,2-polybutadiene having a crystallinity of 5% or more, and a medical instrument such as an infusion set having the medical member as a constituent element. The medical member is excellent in flexibility and hardness, has no leak at a joint, and is also excellent in steam sterilization resistance.

Abstract: Disclosed are oil-extended 1,2-polybutadiene containing an extender oil in a specific amount based on 1,2-polybutadiene and a production method thereof, and a composition further containing another (co)polymer, a foaming agent, a crosslinking agent, a softening agent and other additives. The resulting oil-extended 1,2-polybutadiene and the composition thereof has excellent functions characterizing conventional 1,2-polybutadiene and is further excellent in wear resistance, fluidity (processability), coloring properties (high distinctness of images), flexibility, attachability and the like, so that they can be applied to various formed articles, shoe sole materials and laminate having high performances.

Abstract: An uncrosslinked thermoplastic elastomer composition comprising:(A) 35-95% by weight of a 1,2-polybutadiene having a 1,2-configuration content of 70% or more, a crystallinity of 5-40% by weight and [.eta.] of 0.7 dl/g or more as measured at 30.degree. C. in toluene,(B) 1-20% by weight of an isobutylene polymer or an isobutylene-isoprene copolymer (preferably having a degree of unsaturation of 0-5 mole % and a viscosity average molecular weight of 7,000-80,000),(C) 5-40% by weight of a polybutadiene rubber having a 1,4-configuration content of 80% or more and(D) 0-30% by weight, preferably 5-30% by weight, of at least one member selected from the group consisting of isoprene rubber, natural rubber, acrylonitrile-butadiene rubber, styrene-butadiene rubber and ethylene-propylene type rubbers, wherein, preferably, (B)/{(C)+(D)}=2/1-1/20.

Abstract: A hot melt adhesive composition consisting essentially of 100 parts by weight of polybutadiene having a 1,2-bond structure content of not less than 70% and a crystallinity of not less than 10%, from 50 to 1000 parts by weight of at least one inorganic filler, from 10 to 300 parts by weight of at least one tackifier, and at least one plasticizer and/or at least one flow improving agent, said composition having melt viscosity of from 50 to 50000 poises within a temperature range from 100.degree. to 150.degree. C.