Low cost multilayer elastomeric films having a low permanent set
AssigneePliant Corporation
InventorsAmiel B. Sabbagh, Martin F. Hoenigmann
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Abstract
The presently described technology provides a low cost multilayer elastomeric film containing at least one layer of styrene block copolymer and at least one elastomer layer substantially free of styrene block copolymer such that the resultant film has a low permanent set substantially equal to or less than a film comprised of styrene block copolymer only. The elastomeric film may be used in elasticized features of various articles, such as disposable absorbent articles. Methods for producing the low cost elastomeric film having a low permanent set are also described.
Claims20
A method of manufacturing a laminate, the method comprising the step of:
- laminating at least one non-woven layer and at least one multilayer elastomeric film layer wherein the multilayer elastomeric film comprises:
- (a) a core layer comprising:
- at least one styrene block copolymer layer;
- and
- at least one elastomer or plastomer layer which is substantially free of styrene block copolymer, and
- (b) at least one polyolefin polymer skin layer positioned on at least one side of the core layer,
- wherein the multilayer elastomeric film has a permanent set substantially equal to an elastomeric film having a core layer containing only styrene block copolymer.
A method of manufacturing an elastomeric film, the method comprising the step of:
- coextruding at least one skin layer and at least one core layer;
- wherein the core layer comprises at least one styrene block copolymer layer;
- and
- at least one elastomer or plastomer layer which is substantially free of styrene block co-polymer, the elastomer or polymer having a higher permanent set than that of the styrene block copolymer, and
- wherein the elastomeric film has a permanent set substantially equal to an elastomeric film having a core layer containing only styrene block copolymer.
A method of manufacturing a multilayer elastomeric film, the method comprising the steps of:
- (a) coextruding a core layer comprising an inner core layer containing a styrene block copolymer, and two outer core layers containing a non-styrene block copolymer elastomer or plastomer, wherein one outer core layer is positioned on one side of the inner core layer and the other outer core layer is positioned on the other side of the inner core layer such that the inner core layer is sandwiched between each outer core layer, each outer core layer being substantially free of styrene block copolymer, and
- (b) coextruding two skin layers positioned one on each side of the core layer, the skin layers comprising at least one polyolefin polymer,
- wherein the non-styrene block copolymer elastomer or plastomer comprising the outer core layer has a higher permanent set than the styrene block copolymer comprising the inner core layer, and wherein the multilayer elastomeric film has a permanent set substantially equal to that of a multilayer film having a core layer comprised only of styrene block copolymer.
A component for an absorbent article comprising:
- at least one non-woven outer layer;
- and
- at least one elastomeric film inner layer attached to the non-woven outer layer wherein the elastomeric film inner layer comprises:
- (a) a core layer comprising:
- at least one styrene block copolymer layer;
- and
- at least one elastomer or plastomer layer which is substantially free of styrene block copolymer, and
- (b) at least one polyolefin polymer skin layer positioned on at least one side of the core layer,
- wherein the multilayer elastomeric film has a permanent set substantially equal to an elastomeric film having a core layer containing only styrene block copolymer.
Dependencies are inferred from the claim text.