# US 11,305,034 B2 · Stretchable film and product including same

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- Number: US 11,305,034 B2
- Document ID: US11305034B2
- Status: Granted
- Kind: B2
- Application number: 15/564,302
- Filed: 2016-04-12
- Published: 2018-05-17
- Granted: 2022-04-19
- Earliest claimed: 2015-04-15
- Assignees: Nitto Denko Corporation
- Applicants: Nitto Denko Corporation
- Inventors: Kohei Takeda; Shou Uchida; Muneshige Nakagawa; Shinsuke Ikishima; Yasuhiro Takeda; Yoshitake Shigematsu
- Web page: https://patentgrep.com/patent/US11305034B2

## CPC

- A61L 15/24: Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof {(A61L15/225 takes precedence)}
- A61F 13/01012: {being made of natural material, e.g. cellulose-, protein-, collagen-based}
- A61F 13/15203: {Properties of the article, e.g. stiffness or absorbency (chemical aspects A61L15/00)}
- A61F 13/49009: {with elastic means}
- A61F 13/51121: {characterised by the material}
- A61F 13/51401: {characterised by the material}
- A61L 15/18: containing inorganic materials
- A61L 15/20: containing organic materials
- A61L 15/225: {Mixtures of macromolecular compounds}
- A61L 15/42: Use of materials characterised by their function or physical properties (liquid bandages A61L26/00)
- B29C 55/005: {characterised by the choice of materials}
- B29C 55/04: uniaxial, e.g. oblique
- B29C 55/10: multiaxial
- B29D 7/01: Films or sheets
- B32B 3/266: {characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12}
- B32B 27/08: of synthetic resin
- B32B 27/20: using fillers, pigments, thixotroping agents
- B32B 27/205: {the fillers creating voids or cavities, e.g. by stretching}
- B32B 27/306: {comprising vinyl acetate or vinyl alcohol (co)polymers}
- B32B 27/308: {comprising acrylic (co)polymers}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 27/327: {comprising polyolefins obtained by a metallocene or single-site catalyst}
- B32B 27/36: comprising polyesters
- C08J 5/18: Manufacture of films or sheets
- C08J 9/00: Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof (mechanical aspects of shaping of plastics or substances in a plastic state for the production of porous or cellular articles B29C)
- C08K 3/26: Carbonates; Bicarbonates
- C08K 13/04: Ingredients characterised by their shape and organic or inorganic ingredients
- C08L 23/04: Homopolymers or copolymers of ethene
- C08L 23/12: Polypropene
- C08L 23/14: Copolymers of propene (C08L23/16 takes precedence)
- A61F 2013/15552: {Air permeability}
- B29K 2023/00: Use of polyalkenes {or derivatives thereof} as moulding material
- B29K 2105/16: Fillers
- B29K 2995/0065: Permeability to gases
- B29L 2031/4835: {Masks}
- B29L 2031/4878: {Diapers, napkins}
- B32B 2250/03: 3 layers
- B32B 2250/40: Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
- B32B 2264/0235: Aromatic vinyl resin, e.g. styrenic (co)polymers
- B32B 2264/025: Acrylic resin particles, e.g. polymethyl methacrylate or ethylene-acrylate copolymers
- B32B 2264/102: Oxide or hydroxide
- B32B 2264/104: Oxysalt, e.g. carbonate, sulfate, phosphate or nitrate particles
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2307/50: having particular mechanical properties
- B32B 2307/724: Permeability to gases, adsorption
- B32B 2555/02: Diapers or napkins
- C08J 2300/26: Elastomers
- C08J 2323/08: Copolymers of ethene (C08J2323/16 takes precedence)
- C08J 2323/12: Polypropene
- C08J 2423/16: Ethene-propene or ethene-propene-diene copolymers
- C08K 2003/265: {Calcium, strontium or barium carbonate}
- C08K 2201/003: Additives being defined by their diameter
- C08K 2201/005: Additives being defined by their particle size in general
- C08L 2203/02: for biomedical use
- C08L 2203/16: used for films
- C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
- A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K)
- 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)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B29D: PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE (making granules B29B9/00; making preforms B29B11/00)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES

## Abstract

Provided is a stretchable film having excellent stretchability and excellent air permeability. Also provided is an article including such stretchable film. The stretchable film of the present invention includes an olefin-based resin and a filler.

## Claims

### Claim 1

A stretchable film, comprising:
an olefin-based resin which is an olefin-based elastomer, a non-elastomeric olefin-based resin, or a blend of an olefin-based elastomer, and a non-elastomeric olefin-based resin; and
a filler,
wherein the stretchable film is formed of a laminate of three layers, the laminate having a layer construction of “layer A/layer B/layer C”,
wherein each of layer A, layer B, and layer C comprises the olefin-based elastomer and each of layer A and layer C comprises the non-elastomeric olefin-based resin,
wherein the olefin-based elastomer of the layer B comprises an amorphous polypropylene and the layer B is free of a any non-elastomeric olefin-based resin,
wherein the content of the olefin-based elastomer in the olefin-based resin is from 20 wt. % to 30 wt. % in each of layer A and layer C,
wherein the content of the non-elastomeric olefin-based resin in the olefin-based resin is from 70 wt. % to 80 wt. % in each of layer A and layer C,
wherein the content of the filler in each of layer A, layer B, and layer C is 50 parts by weight or more with respect to 100 parts by weight of the olefin-based resin in each of layer A, layer B, and layer C in the stretchable film,
wherein stretching of the stretchable film produces voids in a surface thereof,
wherein the stretchable film is obtained by subjecting an unstretched film to a stretching treatment, wherein the unstretched film is stretched in at least one direction to a degree of 3.5 times or more and less than 4.5 times, and
wherein the air permeability is 429 sec/100 cc to 1211 sec/100 cc when extended twice in its transverse direction.

### Claim 2 (depends on 1)

The stretchable film according to claim 1, wherein the stretchable film is used in a sanitary article.

### Claim 3 (depends on 1)

An article, comprising the stretchable film of claim 1.

### Claim 4 (depends on 1)

The stretchable film according to claim 1, wherein the olefin-based elastomer has a density of from 0.890 g/cm3 to 0.830 g/cm3.

### Claim 5 (depends on 1)

The stretchable film according to claim 1, wherein the thickness of each of the A layer A and the C layer C serving as surface layers is from 2 μm to 40 μm, and the thickness of the B layer B serving as an intermediate layer is from 10 μm to 70 μm.

### Claim 6 (depends on 5)

The stretchable film according to claim 5, wherein the thickness of each of the A layer A and the C layer C serving as surface layers is from 2 μm to 8 μm, and the thickness of the B layer B serving as an intermediate layer is from 40 μm to 70 μm.

### Claim 7 (depends on 1)

The stretchable film according to claim 1, wherein the olefin-based elastomer has an MFR at 230° C. and 2.16 kgf of from 1.0 g/10 min to 25.0 g/10 min.

### Claim 8 (depends on 1)

The stretchable film according to claim 1, wherein
the olefin-based elastomer of each of layer A and layer C is an olefin block copolymer, an olefin random copolymer, an ethylene copolymer, a propylene copolymer, an ethylene olefin block copolymer, a propylene olefin block copolymer, an ethylene olefin random copolymer, a propylene olefin random copolymer, an ethylene propylene random copolymer, an ethylene (1-butene) random copolymer, an ethylene (1-pentene) olefin block copolymer, an ethylene (1-hexene) random copolymer, an ethylene (1-heptene) olefin block copolymer, an ethylene (1-octene) olefin block copolymer, an ethylene (1-nonene) olefin block copolymer, an ethylene (1-decene) olefin block copolymer, a propylene ethylene olefin block copolymer, an ethylene (α-olefin) copolymer, an ethylene (α-olefin) random copolymer, an ethylene (α-olefin) block copolymer, amorphous polypropylene, combinations of the above-mentioned polymers and polyethylene, combinations of the above-mentioned polymers and polypropylene, or combinations thereof, and
the non-elastomeric olefin-based resin is an α-olefin homopolymer, a copolymer of two or more α-olefins, block polypropylene, random polypropylene, or a copolymer of at least one α-olefin and any other vinyl monomer.

### Claim 9 (depends on 1)

The stretchable film according to claim 1, wherein the olefin-based elastomer of each of layer A and layer C is an ethylene-based elastomer, a propylene-based elastomer, or a 1-butene-based elastomer, and
the non-elastomeric olefin-based resin comprises at least one of high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and homopolypropylene (PP).

### Claim 10 (depends on 1)

The stretchable film according to claim 1, wherein the average particle diameter of the filler is 0.7 μm to 5 μm.

### Claim 11 (depends on 1)

The stretchable film according to claim 1, wherein the olefin-based resin of the B layer B consists of amorphous polypropylene, and the olefin-based resin of each of layers A and C is amorphous polypropylene and non-elastomeric linear low density polyethylene (LLDPE).

### Claim 12 (depends on 1)

The stretchable film according to claim 1 wherein the olefin-based elastomer of each of layer A, layer B, and layer C is the same, and the non-elastomeric olefin-based resin in layer A and layer C is the same.

### Claim 13

A stretchable film, comprising:
an olefin-based resin; and
a filler,
wherein the stretchable film is formed of a laminate of three layers wherein each layer comprises the filler, the laminate having a layer construction of “layer A/layer B/layer C”,
wherein the olefin-based resin of each of layer A and layer C comprises non-elastomeric high density polyethylene (HDPE),
wherein the olefin-based resin of the layer B consists of amorphous polypropylene,
wherein the stretchable film is obtained by subjecting an unstretched film to a stretching treatment, wherein the unstretched film is stretched in at least one direction to a degree of 3.5 times or more and less than 4.5 times, and
wherein the air permeability is 429 sec/100 cc to 1211 sec/100 cc when extended twice in its transverse direction.

### Claim 14 (depends on 13)

The stretchable film according to claim 13, wherein the content of the filler in each of layer A, layer B, and layer C is 50 parts by weight or more with respect to 100 parts by weight of the olefin-based resin of each of layer A, layer B, and layer C in the stretchable film.

### Claim 15 (depends on 13)

The stretchable film according to claim 13, wherein the olefin-based resin of each of layers A and C is non-elastomeric high density polyethylene (HDPE).