To provide a joint part for a resin fuel tank, excellent in both properties of fuel permeability resistance and weldability.
The joint part 1 for the resin fuel tank includes a cylindrical main body 2 and a welding member 3 provided on the main body 2 to be welded on a rim of an opening end of the resin fuel tank 4, wherein the main body 2 and the welding member 3 are integrally formed by an alloy prepared by using main components of the following components (A) and (B) and kneading the alloy at a temperature of not more than melting points of the component (A) and the following component (b), the component (B) is present at an amount of 80 to 300 parts by volume based on 100 parts by volume of the component (A), and a modification ratio of the component (b) is 0.1 to 5% by weight; (A) an ethylene vinyl alcohol copolymer; (B) a high density polyethylene wherein the following component (b) is a main component; and (b) a modified high density polyethylene having at least one functional group selected from the group consisting of a maleic anhydride group and the like.
KATAYAMA KAZUTAKA
SUZUKI JIYUNICHIROU
ITO HIROAKI
