Patent ID: 6733865
Filing Date: 2004-05-11
Classification: A61F,B32B,Y10T

Abstract:
A composite sheet, comprising a nonwoven fabric formed from thermoplastic synthetic resin fibers and a moisture permeable plastic film formed from a thermoplastic synthetic resin and joined to one surface of the nonwoven fabric, wherein:said thermoplastic synthetic resin of said plastic film is any of urethane-based, ester-based and amide-based thermoplastic elastomer resins, and is a block copolymer having hard segments as molecule-constraining constituents that serve to prevent plastic deformation and soft seaments as flexible constituents that permit transmission of moisture vapor. said nonwoven fabric and film both have a total light transmittance of not less than 70% and not greater than 95% when measured according to a JIS K 7105A method; said film is joined by fusion to the synthetic resin fibers constituting said nonwoven fabric, and said composite sheet has a total light transmittance of not less than 60% and not greater than 95% when measured according to a JIS K 7105A method.