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US 5,885,908 AGranted
Anisotropic elastic films
AssigneeMinnesota Mining and Manufacturing Company
InventorsJobst Tilman Jaeger, Alan J. Sipmen
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AssigneeMinnesota Mining and Manufacturing Company
InventorsJobst Tilman Jaeger, Alan J. Sipmen
Estimating the term…
An anisotropic elastic web, particularly an anisotropic elastic film layer having a machine direction and a cross direction and having a thickness of from 20 to 300 microns formed of an extruded blend of a block copolymer elastomer portion and a polyolefin polymer portion blended in a ratio of from 10:1 to 0.4:1, respectively. The elastomer portion generally is a block copolymer elastomer formed of A blocks and B blocks, the A blocks are formed predominately of monoalkenyl arene and the B blocks are formed predominately of conjugated diene. The polyolefin portion is comprised predominately of an inelastic fiber forming polyolefin polymer, copolymer or blend. The anisotropic film layer has a F10 force Ratio (MD to CD) of at least 1.5. This anisotropic elastic web is usable in a variety of garment applications where an elastic is supplied in roll form and requires strength in a machine direction and elastic properties in a cross direction.
An anisotropic elastic extruded film comprising an anisotropic elastic film sheet material having a machine direction and a cross direction and having a thickness of from 20 to 300 microns formed of an extruded blend of a block copolymer elastomer portion and a polyolefin polymer portion blended in a ratio of from 10:1 to 0.4:1, respectively, the elastomer portion comprised of block copolymer elastomer formed of A blocks and B blocks, the A blocks are formed predominantly of monoalkyenyl arene and the B blocks are formed predominately of conjugated diene and the polyolefin portion is comprised predominately of an inelastic fiber forming polyolefin polymer, copolymer or blend, wherein the anisotropic film layer has a F10 force (as measured by ASTM D882-95a) ratio, which F10 ratio is of the machine direction (MD) F10 force to the cross direction (CD) F10 force, of at least 1.5.
The anisotropic elastic film sheet material of claim S wherein said at least one other polymer film layer is a relatively inelastic film layer compared to said anisotropic film sheet material first layer.
Dependencies are inferred from the claim text.