Laminate comprising polyolefin elastic film layer

Disclosed is a laminate comprising at least one polyolefin elastic film layer and at least one substrate layer; the polyolefin elastic film having the following properties: (1) an average integrated enthalpy sum of no greater than 17 J/g, preferably between about 5-17 J/g, according to the Thermal Analysis Method defined herein; (2) an average integrated enthalpy ratio of from 0.6 to 300, preferably 0.8 to 300, still preferably 1.0 to 300, according to the Thermal Analysis Method defined herein; and (3) an unload stress at 75% strain of above 0.8 MPa according to the Hysteresis Test defined herein; and wherein the laminate has a normalized load force/normalized unload force ratio at 75% strain of 1 to 2.6 according to the Hysteresis Test defined herein. 本发明公开了种包含至少个聚烯烃弹性膜层和至少个基底层的层压体；所述聚烯烃弹性膜具有以下特性：(1)根据本文所定义的热分析方法，不超过17J/g，优选地在约5-17J/g之间的平均积分焓总和；(2)根据本文所定义的热分析方法，0.6至300，优选地0.8至300，还优选地1.0至300的平均积分焓比；和(3)根据本文所定义的滞后测试，在75％应变下高于0.8MPa的无载荷应力；并且其中根据本文所定义的滞后测试，所述层压体在75％应变下具有1至2.6的标准载荷力/标准无载荷力比。