Elastic composite film and composite fabric and production processes thereof

A process for continuously producing an elastic composite fabric comprising an elastic cloth laminated onto one or both sides of a composite film provided with an expanded, sintered, porous film substantially consisting of polytetrafluoroethylene and an elastomeric resin layer formed on at least one side of the expanded, sintered, porous film, comprising the steps of:

• (1) continuously forming the elastomeric resin layer on at least one side of the expanded, sintered, porous film;
• (2) continuously laminating the elastic cloth onto one or both sides of the multilayer film obtained in (1) above, and continuously elongating the laminated fabric obtained in the lamination step at less than the yield point of the expanded, sintered, porous film and at an elongation factor of 1.3 times or more in the biaxial directions, or in the uniaxial direction without contracting in the direction perpendicular to the direction of elongation;
• or
• (2′) continuously elongating the multilayer film obtained in (1) above at less than the yield point of the expanded, sintered, porous film and at an elongation factor of 1.3 times or more in the biaxial directions, or in the uniaxial direction without contracting in the direction perpendicular to the direction of elongation, and continuously laminating the elastic cloth onto one or both sides of the elongated multilayer film obtained the elongation step;
• and,
• (3) relaxing the elongated laminated fabric obtained in (2) or (2′) above.