# US 10,119,000 B2 · Laminate film using polylactic acid-based resin

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- Number: US 10,119,000 B2
- Document ID: US10119000B2
- Status: Granted
- Kind: B2
- Application number: 14/772,542
- Filed: 2014-03-06
- Published: 2016-01-07
- Granted: 2018-11-06
- Earliest claimed: 2013-03-15
- Assignees: Toray Industries, Inc.; Nanotheta Co, Ltd.
- Applicants: Toray Industries, Inc.; Nanotheta Co, Ltd.
- Inventors: Motonori Hochi; Yuki Goto; Katsuhiro Minomo; Naomi Tamimiya
- Web page: https://patentgrep.com/patent/US10119000B2

## CPC

- C08J 5/18: Manufacture of films or sheets
- A61L 15/225: {Mixtures of macromolecular compounds}
- A61L 15/24: Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof {(A61L15/225 takes precedence)}
- A61L 15/26: Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof {(A61L15/225 takes precedence)}
- A61L 15/28: Polysaccharides or their derivatives {(A61L15/225 takes precedence)}
- A61L 15/50: Lubricants; Anti-adhesive agents
- A61L 15/64: specially adapted to be resorbable inside the body
- B32B 3/30: characterised by a layer formed with recesses or projections, e.g. {hollows, grooves, protuberances, ribs (apertured layer B32B3/266; layer with cavities or internal voids B32B3/26)}
- B32B 27/08: of synthetic resin
- B32B 27/306: {comprising vinyl acetate or vinyl alcohol (co)polymers}
- B32B 27/36: comprising polyesters
- B32B 2307/538: Roughness
- B32B 2556/00: Patches, e.g. medical patches, repair patches
- C08J 2305/00: Characterised by the use of polysaccharides or of their derivatives not provided for in groups C08J2301/00 or C08J2303/00
- C08J 2329/04: Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
- C08J 2367/00: Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J 2367/04: Polyesters derived from hydroxy carboxylic acids, e.g. lactones (C08J2367/06 takes precedence)
- C08J 2405/00: Characterised by the use of polysaccharides or of their derivatives not provided for in groups C08J2401/00 or C08J2403/00
- C08J 2429/04: Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
- C08J 2467/00: Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J 2467/04: Polyesters derived from hydroxy carboxylic acids, e.g. lactones (C08J2467/06 takes precedence)
- 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)
- 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)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM

## Abstract

Our invention is a laminate film comprising a water-soluble resin layer and a polylactic acid-based resin layer laminated on at least one side of a substrate film, the water-soluble resin layer has a thickness of 0.1 to 15 μm, the polylactic acid-based resin layer has a thickness of 10 to 500 nm. Such a configuration provides a laminate film of which the water-soluble resin layer and the polylactic acid-based resin layer are easily separated from the substrate film and which is excellent in coating ability, adherence and followability to a soft and curved adherend, as well as compatibility to skin and organs such as viscera, so as to be suitable for wound dressing, adhesion prevention material and a skin external agent such as skin-care product.

## Claims

### Claim 1

A laminate film comprising a water-soluble resin layer and a polylactic acid-based resin layer laminated on a polyester or polyolefin substrate film surface, wherein
the water-soluble resin layer has a thickness of 0.1 to 15 μm,
the polylactic acid-based resin layer has a thickness of 10 to 500 nm, and
the substrate film surface has a center-line average surface roughness (SRa) of 3 to 50 nm and a ten-point average surface roughness (SRz) of 50 to 1000 nm.

### Claim 2 (depends on 1)

The laminate film according to claim 1, wherein the water-soluble resin layer contains a polyvinyl alcohol.

### Claim 3 (depends on 2)

The laminated film according to claim 2, wherein the polyvinyl alcohol has a saponification degree of 85 to 98.5 mol %.

### Claim 4 (depends on 1)

The laminate film according to claim 1, wherein the polylactic acid-based resin layer contains a polylactic acid-based resin including a poly-D-lactic acid of 4 to 13 mol %.

### Claim 5 (depends on 1)

The laminate film according to claim 1, wherein the water-soluble resin layer contains a pullulan.