# US 9,040,437 B2 · Elastic laminate

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- Number: US 9,040,437 B2
- Document ID: US9040437B2
- Status: Granted
- Kind: B2
- Application number: 12/972,655
- Filed: 2010-12-20
- Published: 2012-01-05
- Granted: 2015-05-26
- Earliest claimed: 2009-12-19
- Assignees: Mondi Consumer Packaging Technologies GmbH
- Applicants: Henner Sollmann
- Inventors: Henner Sollmann
- Web page: https://patentgrep.com/patent/US9040437B2

## CPC

- B32B 37/02: characterised by a sequence of laminating steps, e.g. by adding new layers at consecutive laminating stations
- A61F 13/15699: {Forming webs by bringing together several webs, e.g. by laminating or folding several webs, with or without additional treatment of the webs}
- A61F 13/15707: {Mechanical treatment, e.g. notching, twisting, compressing, shaping}
- A61F 13/4902: {characterised by the elastic material}
- A61F 13/56: Supporting or fastening means
- B32B 5/26: another layer {next to it} also being fibrous or filamentary {(relative arrangement of fibres or filaments of different layers B32B5/12)}
- B32B 7/022: Mechanical properties
- B32B 7/04: Interconnection of layers
- B32B 27/12: next to a fibrous or filamentary layer
- B32B 37/0076: {characterised in that the layers are not bonded on the totality of their surfaces}
- B32B 37/12: characterised by using adhesives
- B32B 37/1207: {Heat-activated adhesive (B32B37/04 takes precedence)}
- B32B 37/15: with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
- B32B 37/18: involving the assembly of discrete sheets or panels only
- B32B 38/0012: {Mechanical treatment, e.g. roughening, deforming, stretching}
- B32B 2037/1215: {Hot-melt adhesive}
- B32B 2038/0028: {Stretching, elongating}
- B32B 2305/28: in the form of a mat
- B32B 2307/51: Elastic
- B32B 2333/08: Polymers of acrylic acid esters, e.g. PMA, i.e. polymethylacrylate
- B32B 2367/00: Polyesters, e.g. PET, i.e. polyethylene terephthalate
- B32B 2369/00: Polycarbonates
- B32B 2377/00: Polyamides
- B32B 2555/02: Diapers or napkins
- Y10T 428/24273: including aperture
- Y10T 428/24975: No layer or component greater than 5 mils thick
- Y10T 428/249921: Web or sheet containing structurally defined element or component
- Y10T 428/265: 1 mil or less
- Y10T 442/2738: Coating or impregnation intended to function as an adhesive to solid surfaces subsequently associated therewith
- Y10T 442/60: Nonwoven fabric [i.e., nonwoven strand or fiber material]
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An elastic laminate has a coextruded film having an outer film layer formed of an elastic and sticky styrene-block copolymer and an inner film layer of lesser elasticity than the outer layer, an outer fleece or nonwoven web or overlay, an outer adhesive layer between the outer fleece web and the outer film layer adhering the outer fleece web to the outer film layer, an inner fleece or nonwoven web or overlay, and an inner adhesive layer between the inner fleece web and the inner film layer adhering the inner fleece web to the inner film layer. The inner adhesive layer forming between the inner fleece web and the inner film layer a bond that is weaker than a bond formed by the outer adhesive layer between the outer fleece web and the outer film layer such that on stretching the inner fleece layer separates locally from the inner film layer.

## Claims

### Claim 1

An elastic laminate comprising:
a coextruded film having an elastic outer film layer formed of a styrene-block copolymer and an inner film layer of lesser elasticity than the outer film layer and the inner film layer being made of a polyamide, polymethylmethacrylate, polyoxymethylene, polycarbonate, polyethylene terephthalate, or polybutylene terephthalate or mixtures thereof;
an outer polyolefin fleece web;
an outer adhesive layer extending continuously between the outer fleece web and the outer film layer, adhering the outer fleece web to the outer film layer, made of a hot-melt adhesive based on a styrene block copolymer, and bonding the outer fleece web and the outer film layer together continuously over full surface regions between the outer fleece web and the coextruded film;
an inner polyolefin fleece web; and
an inner adhesive layer extending continuously between the inner fleece web and the inner film layer, adhering to the inner fleece web over a full surface region thereof, made of a hot-melt adhesive based on a styrene block copolymer, and forming between the inner fleece web and the inner film layer a bond that is discontinuous and weaker than a bond formed by the outer adhesive layer between the outer fleece web and the outer film layer and that is created by an initial stretching that locally separates the inner fleece web and the inner adhesive layer from the inner film layer and creates a microstructure without a fixed pattern while leaving a multiplicity of separate local bonds between the inner fleece layer and the inner film layer, the inner film layer and the inner fleece web being separated and not bonded together at breaks by the inner adhesive layer between the local bonds.

### Claim 2 (depends on 1)

The elastic laminate defined in claim 1 wherein the inner and outer adhesive layers are of the same polymer.

### Claim 3 (depends on 1)

The elastic laminate defined in claim 1 wherein a polarity difference between outer film layer and the outer adhesive layer is less than the polarity difference between the inner film layer and the outer film layer and the polarity difference between the inner film layer and the inner adhesive layer.

### Claim 4 (depends on 1)

The elastic laminate defined in claim 1 wherein the fleece webs are of substantially identical composition and properties.

### Claim 5 (depends on 4)

The elastic laminate defined in claim 4 wherein the outer film layer has a thickness between 10 μm and 100 μm.

### Claim 6 (depends on 5)

The elastic laminate defined in claim 5 wherein the inner film layer is has a thickness between 2 μm and 50 μm.

### Claim 7 (depends on 1)

The elastic laminate defined in claim 1 wherein the coextruded film has only two layers.

### Claim 8 (depends on 1)

The elastic laminate defined in claim 1 wherein the working temperatures of the polymers of the outer film layer, the inner film layer, and both the adhesive layers is between 180° C. and 260° C.

### Claim 9 (depends on 1)

The elastic laminate defined in claim 1 wherein the inner film layer is imperforate and continuous.

### Claim 10 (depends on 1)

The elastic laminate defined in claim 1 wherein the outer film layer is formed by the initial stretching with breaks forming throughgoing perforations.