Patent ID: 7300895

Claim:
A stretchable composite sheet comprising: an elastic sheet having a stretchability in at least one of two directions that are orthogonal to each other; and a fibrous assembly in the form of a sheet having a stretchability in one of said at least two directions and joined to at least one surface of said elastic sheet, said fibrous assembly comprising a plurality of fibers and having an inelastic stretchability and being joined to said elastic sheet at binding spots to form a joined composite sheet structure which is thereafter stretched so as to change the dimensions of the fibers in the fibrous assembly and the elastic stretchability of the composite sheet, said binding spots being arranged intermittently along said two directions, said fibrous assembly comprising fibers that are curved between adjacent pairs of said binding spots along said one of said at least two directions, said fibers comprising ethylene/propylene copolymer containing ethylene at 0.5-10% by weight, ethylene/propylene/butene containing ethylene at 0.5-10% by weight and butene at 0.5-15% by weight, or a mixture thereof at 100-10% by weight.