Patent ID: 11965083
Assignee: KIMBERLY-CLARK WORLDWIDE, INC.
Field: Other special machines (Mechanical engineering)
Classification: CPC B  C | IPC B  C

Claim 0:
1. A polyolefin material that is formed by drawing of a thermoplastic composition, wherein the thermoplastic composition contains

a continuous phase that includes a polyolefin matrix polymer and
from about 1 wt. % to about 20 wt. %, based on the weight of the continuous phase, of a polymeric microinclusion additive dispersed within the continuous phase in the form of discrete domains;
from about 0.05 wt. % to about 20 wt. % based on the weight of the continuous phase, of a polymeric nanoinclusion additive dispersed within the continuous phase in the form of discrete domains;

wherein a porous network is defined in the composition that includes a plurality of nanopores having an average cross-sectional dimension of about 800 nanometers or less, and a plurality of micropores having an aspect ratio of an axial dimension to a cross-sectional dimension of about 1 to about 30, the composition having a density of about 0.90 g/cm3 or less; and
wherein the polyolefin material exhibits a hydrohead value of about 50 centimeters or more.