# US 9,434,129 B2 · Dry adhesives

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- Number: US 9,434,129 B2
- Document ID: US9434129B2
- Status: Granted
- Kind: B2
- Application number: 13/962,207
- Filed: 2013-08-08
- Published: 2014-02-13
- Granted: 2016-09-06
- Earliest claimed: 2011-05-13
- Assignees: Mylan Group
- Applicants: Mylan Group
- Inventors: My T. Nguyen; Loc Vinh Bui
- Web page: https://patentgrep.com/patent/US9434129B2

## CPC

- C09J 7/00: Adhesives in the form of films or foils
- B32B 3/00: Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- 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 27/10: of paper or cardboard
- B32B 27/36: comprising polyesters
- C09J 109/06: Copolymers with styrene
- C09J 153/02: Vinyl aromatic monomers and conjugated dienes
- C09J 183/04: Polysiloxanes
- B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer
- B32B 2255/26: Polymeric coating
- B32B 2367/00: Polyesters, e.g. PET, i.e. polyethylene terephthalate
- B32B 2405/00: Adhesive articles, e.g. adhesive tapes
- B81B 1/002: {Holes characterised by their shape, in either longitudinal or sectional plane}
- B81B 2203/0315: Cavities
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- C09J 2301/31: the adhesive effect being based on a Gecko structure
- Y10T 428/24355: Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
- Y10T 428/24479: including variation in thickness
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B81B: MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES (piezoelectric, electrostrictive or magnetostrictive elements per se H10N30/00, H10N35/00)
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A dry adhesive comprising a micro-featured and nano-featured surface, and a compliant surface having a hardness of about 60 Shore A or less, the micro-featured and nano-featured surface and the compliant surface being capable of forming upon contact a dry adhesive bond with each other.

## Claims

### Claim 1

A dry self-adhesive surface comprising at least two areas, wherein:
a. at least one of said areas of the dry self-adhesive surface is a non-tacky micro-featured and nano-featured area, said micro-featured and nano-featured areas having micropores and nanopores, wherein said micropores and nanopores define a roughness average in amplitude (Ra) between about 0.2 μm and about 3.0 μm with a mean spacing of profile irregularities (RSm) between about 20 nm and about 2000 nm, and
b. at least one other of said areas of the dry self-adhesive surface is a non-tacky compliant area having a hardness of about 60 Shore A or less,
the micro-featured and nano-featured area and the compliant area being capable of forming upon contact a dry adhesive bond with each other in which the compliant area conforms with the topography of the microporous and nano-porous area resulting in a reversible interlock of the compliant area in the micropores and nanopores of said micro-featured and nano-featured area.

### Claim 2 (depends on 1)

The dry self-adhesive surface of claim 1, wherein said compliant area is deposited on part of a micro-featured and nano-featured surface forming exposed micro-featured and nano-featured surfaces and compliant areas, the micro-featured and nano-featured area being provided by the part of the exposed micro-featured and nano-featured surface that is free from the compliant area.

### Claim 3 (depends on 2)

The dry self-adhesive surface of claim 2, comprising multiple discrete compliant areas spaced apart on the micro-featured and nano-featured surface.

### Claim 4 (depends on 3)

The dry self-adhesive surface of claim 3, wherein the ratio of the total area occupied by the compliant areas to the total area occupied by the micro-featured and nano-featured surface in the spaces between the compliant areas is 1:1.1 or more.

### Claim 5 (depends on 2)

The dry self-adhesive surface of claim 2, wherein the micro-featured and nano-featured surface is a metallic surface, a paper surface, or a polymeric surface.

### Claim 6 (depends on 1)

The dry self-adhesive surface of claim 1, wherein said micro-featured and nano-featured area is deposited on part of a compliant surface forming exposed compliant ares and micro-featured and nano-featured surfaces, the compliant area being provided by the part of the exposed compliant surface that is free from the micro-featured and nano-featured area.

### Claim 7 (depends on 3)

The dry self-adhesive surface of claim 3, comprising multiple discrete micro-featured and nano-featured areas spaced apart on the compliant surface.

### Claim 8 (depends on 7)

The dry self-adhesive surface of claim 7, wherein the ratio of the total area occupied by the micro-featured and nano-featured areas to the total area occupied by the compliant surface in the spaces between the micro-featured and nano-featured areas is 1:1.1 or more.

### Claim 9 (depends on 1)

The dry self-adhesive surface of claim 1, comprising one or more micro-featured and nano-featured area(s) and one or more compliant area(s) deposited on a surface of a support.

### Claim 10 (depends on 9)

The dry self-adhesive surface of claim 9, wherein the surface of the support is a plastic surface, a metal surface, or a paper surface that is optionally backed by a plastic layer.

### Claim 11 (depends on 10)

The dry self-adhesive surface of claim 10, wherein the plastic surface is a PET film.

### Claim 12 (depends on 1)

The dry self-adhesive surface of claim 1, wherein the compliant area comprises a polymer.

### Claim 13 (depends on 12)

The dry self-adhesive surface of claim 12, wherein the polymer comprised in the compliant area is a thermoplastic elastomer or a crosslinked elastomer.

### Claim 14 (depends on 12)

The dry self-adhesive surface of claim 12, wherein the polymer comprised in the compliant area is a silicone elastomer, a styrene-isoprene elastomer, a styrene-butadiene elastomer, a styrene-ethylene/butylene-styrene elastomer, a styrene-ethylene/propylene-styrene elastomer, an ethylene-butadiene-styrene elastomer, a siloxane polymer, or a poly-isocyanate.

### Claim 15 (depends on 1)

The dry self-adhesive surface of claim 1, comprising multiple micro-featured and nano-featured areas and multiple compliant surface areas.

### Claim 16 (depends on 15)

The dry self-adhesive surface of claim 15, wherein the areas range(s) in size from about 1 μm to about 5 mm.

### Claim 17 (depends on 1)

The dry self-adhesive surface of claim 1, wherein the micro-featured and nano-featured area(s) has a mean spacing of profile irregularities (RSm) between about 20 nm and about 1500 nm.

### Claim 18 (depends on 17)

The dry self-adhesive surface of claim 17, wherein the micro-featured and nano-featured area(s) has a mean spacing of profile irregularities (RSm) between about 20 nm and about 1000 nm.

### Claim 19 (depends on 18)

The dry self-adhesive surface of claim 18, wherein the micro-featured and nano-featured area(s) has a mean spacing of profile irregularities (RSm) between about 20 nm and about 500 nm.

### Claim 20 (depends on 1)

The dry self-adhesive surface of claim 1, wherein the micro-featured and nano-featured area(s) has a roughness average in amplitude (Ra) ranging between about 0.2 μm and about 1.5 μm.

### Claim 21 (depends on 20)

The dry self-adhesive surface of claim 20, wherein the micro-featured and nano-featured area(s) has a roughness average in amplitude (Ra) ranging between about 0.25 μm and about 1.5 μm.

### Claim 22 (depends on 20)

The dry self-adhesive surface of claim 20, wherein the micro-featured and nano-featured area(s) has a roughness average in amplitude (Ra) ranging between about 0.2 μm and about 0.7 μm.

### Claim 23 (depends on 1)

The dry self-adhesive surface of claim 1, wherein the compliant area has a hardness of about 50 Shore A or less.

### Claim 24 (depends on 23)

The dry self-adhesive surface of claim 23, wherein the compliant area has a hardness of about 40 Shore A or less.

### Claim 25 (depends on 24)

The dry self-adhesive surface of claim 24, wherein the compliant area has a hardness of about 30 Shore A or less.