Patent ID: 6991266

Claim:
A pipe joint made of resin, comprising: a joint body which is made of resin, said joint body having a pipe receiving port at one end portion, and an external thread portion on an outer periphery of said pipe receiving port; a sleeve which is made of resin, and which is pressingly inserted into an inner or outer periphery of one end portion of a tube made of resin, to be integrated therewith; and a union nut which is made of resin, which has an internal thread portion, and which is loosely fitted onto the outer periphery of said one end portion of said tube, and which is screwed via said internal thread portion to said external thread portion of said joint body, said one end portion of said tube into which said sleeve is pressingly inserted to be integrated therewith being inserted into said pipe receiving port, a gap between said one end portion of said tube and said pipe receiving port of said joint body being sealed via said sleeve which is pressed against said joint body by fastening said union nut, wherein: a section shape of each thread of said external thread portion of said joint body and said internal thread portion of said union nut is formed as an asymmetrical trapezoid, defining a first flank and a second flank and having an included angle of said first flanks of said asymmetrical trapezoidal which contact with each other by fastening said union nut is set to 70 to 90°, and an included angle of said second flanks opposite to said first flanks is set to 40 to 80°, wherein said joint body defines a sealing portion the angle and direction of taper of which is defined by an angle θ 0 , said external thread is defined by an angle θ 1, and wherein θ 0 <θ 1 and |cos θ 0 |>|cos θ 1 |.