STRETCH RELEASABLE ADHESIVE

• US 20090229732A1
• Filed: 03/12/2009
• Published: 09/17/2009
• Est. Priority Date: 03/14/2008
• Status: Abandoned Application

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Purgett, Mark D., Everaerts, Albert I., Bries, James L., Emslander, Jeffrey O., Determan, Michael D., Tran, Thu-Van T., Yamanaka, Michiko, Calverley, Karen J.
• Application Number:
  US12/402,845
• Publication Number:
  US 20090229732A1
• Time in Patent Office: Days
• US Class Current: 156/60
• CPC Class Codes: B32B 2255/10 on synthetic resin layer or on natural or synthetic rubber layer
• CPC Class Codes: B32B 2255/102 synthetic resin or rubber layer being a foamed layer
• CPC Class Codes: B32B 2266/0221 Vinyl resin
• CPC Class Codes: B32B 2266/0242 Acrylic resin
• CPC Class Codes: B32B 2266/025 Polyolefin vinyl or acrylic copolymers B32B2266/0221, B32B2266/0242
• CPC Class Codes: B32B 2266/0264 Polyester
• CPC Class Codes: B32B 2266/0278 Polyurethane
• CPC Class Codes: B32B 2270/00 Resin or rubber layer containing a blend of at least two different polymers
• CPC Class Codes: B32B 2274/00 Thermoplastic elastomer material thermoplastic elastomer fibres B32B2262/0215, thermoplastic elastomer particles B32B2264/0221, thermoplastic elastomer foam B32B2266/0292
• CPC Class Codes: B32B 2307/40 having particular optical properties light or UV resistant B32B2307/71
• CPC Class Codes: B32B 2307/41 Opaque
• CPC Class Codes: B32B 2307/414 Translucent
• CPC Class Codes: B32B 2307/50 having particular mechanical properties
• CPC Class Codes: B32B 2307/54 Yield strength; Tensile strength
• CPC Class Codes: B32B 2307/748 Releasability
• CPC Class Codes: B32B 2405/00 Adhesive articles, e.g. adhesive tapes labels B32B2519/00
• CPC Class Codes: B32B 25/042 of natural rubber or synthetic rubber
• CPC Class Codes: B32B 25/045 of foam
• CPC Class Codes: B32B 25/08 of synthetic resin
• CPC Class Codes: B32B 25/12 comprising natural rubber
• CPC Class Codes: B32B 25/14 : comprising synthetic rubber copolymers B32B25/18 and B32B25/20 take precedence
• CPC Class Codes: B32B 25/16 : comprising polydienes homopolymers or poly-halodienes homopolymers B32B25/12 takes precedence
• CPC Class Codes: B32B 25/18 : comprising butyl or halobutyl rubber
• CPC Class Codes: B32B 25/20 : comprising silicone rubber
• CPC Class Codes: B32B 27/065 : of foam
• CPC Class Codes: B32B 27/08 : of synthetic resin
• CPC Class Codes: B32B 27/16 : specially treated, e.g. irradiated
• CPC Class Codes: B32B 27/18 : characterised by the use of special additives
• CPC Class Codes: B32B 27/20 : using fillers, pigments, thixotroping agents
• CPC Class Codes: B32B 27/283 : comprising polysiloxanes
• CPC Class Codes: B32B 27/30 : comprising vinyl (co)polymers; comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/302 : comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
• CPC Class Codes: B32B 27/308 : comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/32 : comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: B32B 27/36 : comprising polyesters
• CPC Class Codes: B32B 27/365 : comprising polycarbonates
• CPC Class Codes: B32B 27/40 : comprising polyurethanes
• CPC Class Codes: B32B 5/147 : by treatment of the layer
• CPC Class Codes: B32B 5/18 : characterised by features of a layer of foamed material
• CPC Class Codes: B32B 5/22 : characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed layer formed of natural mineral fibres or particles next to a foam layer B32B19/047, next to a layer made of particles B32B19/048, or next to a fibrous or filamentary layer B32B19/06; paper layer or cardboard layer next to a paper layer or cardboard layer B32B29/005, next to a foam layer B32B29/007, next to a fibrous or filamentary layer B32B29/02, or next to a particulate layer B32B29/04
• CPC Class Codes: B32B 5/32 : at least two layers being foamed and next to each other
• CPC Class Codes: B32B 7/06 : permitting easy separation
• CPC Class Codes: B32B 7/12 : using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: C09J 183/08 : containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen
• CPC Class Codes: C09J 2301/308 : the adhesive tape or sheet losing adhesive strength when being stretched, e.g. stretch adhesive
• CPC Class Codes: C09J 7/10 : without carriers
• CPC Class Codes: C09J 7/22 : Plastics; Metallised plastics
• CPC Class Codes: C09J 7/243 : Ethylene or propylene polymers
• CPC Class Codes: G02F 1/133325 : Assembling processes
• CPC Class Codes: G02F 2202/28 : Adhesive materials or arrangements
• CPC Class Codes: H01L 21/67132 : Apparatus for placing on an insulating substrate, e.g. tape
• CPC Class Codes: Y10T 156/10 : Methods of surface bonding and/or assembly therefor
• CPC Class Codes: Y10T 428/28 : Web or sheet containing structurally defined element or component and having an adhesive outermost layer
• CPC Class Codes: Y10T 428/2848 : Three or more layers

Abstract

A stretch releasable adhesive article includes first and second opposed major surfaces and a pull tab, and at least a portion of at least one of the first and second major surfaces is adhesive. The adhesive article has a cross-sectional area—as measured normal to the axis defined by a stretch release force applied to the pull tab during the stretch release process—that has a defined width to thickness ratio, and the adhesive article may have a visible light transmission of at least about 90%, and a haze of no greater than 5%.

Claims

1. A stretch releasable adhesive article having first and second opposed major surfaces and a pull tab, wherein at least a portion of at least one of the first and second major surfaces is adhesive, and wherein the adhesive article has a cross-sectional area as measured normal to the axis defined by a stretch release force applied to the pull tab during the stretch release process that has a width to thickness ratio of at least 25:

1, and further wherein the adhesive article has a visible light transmission of at least about 90%, and a haze of no greater than 5%.

2. An adhesive article as defined in claim 1, wherein the adhesive article has a width to thickness ratio of at least 30:

1.

3. An adhesive article as defined in claim 1, wherein each of the first and second major surfaces has an adhesive area of at least about 10 square centimeters.

4. An adhesive article as defined in claim 1, wherein the adhesive article has a width of at least about 20 mm.

5. An adhesive article as defined in claim 1, wherein the adhesive article has an average thickness of at least about 25 microns (1 mil) and no greater than about 1300 microns (50 mils).

6. An adhesive article as defined in claim 1, wherein the adhesive article includes an extensible backing having opposed first and second major surfaces, and wherein at least one of the first and second major surfaces includes a layer of pressure sensitive adhesive.

7. An adhesive article as defined in claim 6, wherein the backing has a cross-sectional area as measured normal to the axis defined by a stretch release force applied to the adhesive article during the stretch release process that has a width to thickness ratio of at least 30:

1.

8. An adhesive article as defined in claim 6, wherein the backing is selected from the group consisting of polyolefins, vinyl copolymers, olefinic copolymers, urethane, styrenic block copolymers, acrylic polymers and copolymers, and combinations thereof.

9. An adhesive article as defined in claim 1, wherein the adhesive comprises at least one of natural rubber, polyisoprene, polybutadiene, polyurethane, styrene-isoprene-styrene, styrene-butadiene-styrene, styrene-ethylene/butylene-styrene, styrene-ethylene/propylene-styrene acrylic copolymer, acrylic block copolymer, silicone elastomeric polymers, and mixtures thereof.

10. An assembly, comprising:

(a) a first substrate having a major surface and a perimeter;

(b) a continuous stretch releasable adhesive article arranged on substantially all of the first substrate major surface, wherein the stretch releasable adhesive article includes a portion extending beyond the first substrate perimeter, thereby defining a pull tab; and

(c) a second substrate arranged on substantially all of the stretch release adhesive article opposite the first substrate;

wherein the stretch releasable adhesive article is extensible and has a first major axis defined by the direction of a stretch force applied to the adhesive article during the stretch release process, a length defined along the first major axis, a second major axis transverse to the first major axis, and a width defined along the second major axis, wherein at least a portion of at least one of the first and second major surfaces is adhesive, and wherein the ratio of the adhesive article width to the adhesive article thickness measured in an imaginary plane normal to the first major axis is at least about 15;

1.

11. An assembly as defined in claim 10, wherein the assembly is an optical assembly, and further wherein the first substrate is optically clear.

12. An assembly as defined in claim 11, wherein the stretch releasable adhesive article has a visible light transmission of at least about 90%.

13. An assembly as defined in claim 12, wherein the stretch releasable adhesive article has a haze of no greater than about 5%.

14. An assembly as defined in claim 13, wherein the stretch releasable adhesive article has a thickness of at least about 10 microns and no greater than about 300 microns.

15. A method of temporarily adhesively bonding a substrate to a liquid crystal display comprising the step of arranging a double-sided stretch releasable adhesive article between the substrate and the liquid crystal display with a portion of the stretch releasable adhesive article extending outwardly from between the substrate and the liquid crystal display, wherein the stretch releasable adhesive article has a visible light transmission of at least about 90%, a haze of no greater than about 5%, and further wherein the stretch releaseable adhesive article is removable from the substrate and liquid crystal display by stretching.

16. A method as defined in claim 15, wherein the ratio of the adhesive article width to the adhesive article thickness measured in an imaginary plane normal to the first major axis is at least about 15:

1.

17. A method as defined in claim 16, wherein the stretch releasable adhesive article has a thickness of at least about 10 microns and no greater than about 300 microns.

18. A method as defined in claim 15, wherein the substrate comprises at least one of an optical film, a touch panel, and a rigid optically clear lens.

19. A stretch releasable adhesive article comprising an extensible sheet having opposed major surfaces, at least a portion of one major surface being adhesive, wherein the sheet has a cross-sectional area as measured normal to the axis defined by a stretch release force applied to the adhesive article during the stretch release process that has a width to thickness ratio of at least 25:

1, and further wherein the adhesive article has a visible light transmission of at least about 80%, and a haze of no greater than 10%

20. A stretch releasable adhesive article having first and second opposed major surfaces and a pull tab, wherein at least a portion of at least one of the first and second major surfaces is adhesive, and wherein the adhesive article has a visible light transmission of at least about 90%, and a haze of no greater than 5%.

21. A stretch releasable adhesive sheet having first and second opposed major surfaces and a pull tab, wherein at least a portion of at least one of the first and second major surfaces is adhesive, and wherein the adhesive article has a cross-sectional area as measured normal to the axis defined by a stretch release force applied to the pull tab during the stretch release process that has a width to thickness ratio of at least 30:

1.