Polymer laminate possessing an intermediate water vapor transmission barrier layer
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United States of America Patent
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Oct 27, 1987
Issued Date -
N/A
app pub date -
Dec 30, 1985
filing date -
Jul 11, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An opaque barrier layer which comprises: (a) at least one thermoplastic polymer matrix substrate layer within which is located a strata of voids; positioned at least substantially within at least a substantial number of said voids is at least one spherical void-initiating particle which is phase distinct and incompatible with the matrix material, the void space occupied by said particle being substantially less than the volume of said void, with one generally cross-sectional dimension of said particle at least approximating a corresponding cross-sectional dimension of said void; and, (b) at least one thermoplastic water vapor transmission barrier layer affixed to said thermoplastic substrate layer.
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