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AssigneeKimberly-Clark Worldwide, Inc.
InventorsVasily A. Topolkaraev, Ryan J. McEneany, Steven R. Stopper
Estimating the term…
A film that comprises a thermoplastic composition that contains a continuous phase that includes a polyolefin matrix polymer and a nanoinclusion additive dispersed within the continuous phase in the form of discrete domains is provided. The film is biaxially stretched in a machine direction and cross-machine direction to form a porous network in the composition. The porous network contains nanopores having a maximum cross-sectional dimension of about 800 nanometers or less. At least a portion of the nanopores are oriented in the cross-machine direction so that the axial dimension generally extends in the cross-machine direction and the cross-sectional dimension generally extends in the machine direction.
A film that comprises a thermoplastic composition that contains a continuous phase that includes a polyolefin matrix polymer and a nanoinclusion additive dispersed within the continuous phase in the form of discrete domains, wherein the film is biaxially stretched in a machine direction and cross-machine direction to form a porous network in the composition, wherein the porous network contains nanopores having an axial dimension and a cross-sectional dimension, wherein the maximum cross-sectional dimension of the nanopores is about 800 nanometers or less, and further wherein at least a portion of the nanopores are oriented in the cross-machine direction so that the axial dimension generally extends in the cross-machine direction and the cross-sectional dimension generally extends in the machine direction.
The film of claim 14, wherein the polymer of the microinclusion additive has a glass transition temperature of about 0° C. or more.
Dependencies are inferred from the claim text.