Compositions Comprising Propylene-Based Elastomers and Polyalphaolefins

摘要

Provided are compositions comprising a propylene-based elastomer and a polyalphaolefin. The compositions may be particularly useful in elastic film compositions, and especially useful as elastic film layers in nonwoven laminates. The composition may comprise a blend of from about 0.5 to about 60 wt % of a polyalphaolefin and 40 to 99.5 wt % of a propylene-based elastomer. The composition may comprise a blend of a propylene-based elastomer that comprises propylene and from 5 to 30 wt % of an α-olefin and a polyalphaolefin having a kinematic viscosity (KV) at 100° C. of from 100 to 3000 cSt.

主权项

1. A composition comprising from about 0.5 to about 60 wt % of a polyalphaolefin and 40 to 99.5 wt % of a propylene-based elastomer,
where the propylene-based elastomer comprises propylene-derived units and 5 to 30 wt % of α-olefin-derived units and where the propylene-based elastomer has a melting temperature of less than 120° C. and a heat of fusion of less than 75 J/g; where the polyalphaolefin has a kinematic viscosity (KV) at 100° C. of from 100 to 3000 cSt; and where the blend composition has at least one of the following properties: (i) a first cycle hysteresis top load at 50% strain of less than 25N; (ii) a first cycle hysteresis top load at 100% strain of less than 30N; (iii) a first cycle hysteresis retractive force at 50% strain of less than 15N; (iv) a second cycle hysteresis top load at 50% strain of less than 20N; (v) a second cycle hysteresis top load at 100% strain of less than 30N; (vi) a second cycle hysteresis retractive force at 50% strain of less than 12N; or (vii) a first cycle hysteresis top load at 50% strain that is at least 15% lower than a similar composition containing the same propylene-based elastomer but that contains no polyalphaolefin.