# US 11,993,736 B2 · Adhesive composition, adhesive film comprising adhesive composition, back plate film comprising adhesive film, and plastic organic light emitting display comprising adhesive film

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- Number: US 11,993,736 B2
- Document ID: US11993736B2
- Status: Granted
- Kind: B2
- Application number: 17/259,605
- Filed: 2019-07-29
- Published: 2021-09-16
- Granted: 2024-05-28
- Earliest claimed: 2018-07-27
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Sanghun Han; Yoonkyung Kwon; Byungsu Park; Hui Je Lee; Seongwook Kang
- Web page: https://patentgrep.com/patent/US11993736B2

## CPC

- C09J 7/385: {Acrylic polymers}
- C08F 220/1818: {C13or longer chain (meth)acrylate, e.g. stearyl (meth)acrylate}
- C08F 230/08: containing silicon
- C08F 283/124: {on to polysiloxanes having carbon-to-carbon double bonds}
- C08F 290/068: {Polysiloxanes}
- C08G 77/14: containing silicon bound to oxygen-containing groups
- C08G 77/20: containing silicon bound to unsaturated aliphatic groups
- C08G 77/445: containing polyester sequences
- C08L 33/08: Homopolymers or copolymers of acrylic acid esters
- C08L 51/085: {on to polysiloxanes}
- C08L 83/04: Polysiloxanes
- C09D 151/085: {on to polysiloxanes}
- C09J 7/20: characterised by their carriers
- C09J 7/24: based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J 7/25: based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
- C09J 7/40: characterised by release liners
- C09J 133/066: {containing -OH groups}
- C09J 133/08: Homopolymers or copolymers of acrylic acid esters
- C09J 133/10: Homopolymers or copolymers of methacrylic acid esters
- C09J 133/14: of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
- C09J 139/06: Homopolymers or copolymers of N-vinyl-pyrrolidones
- C09J 183/04: Polysiloxanes
- C09J 183/06: containing silicon bound to oxygen-containing groups (C09J183/12 takes precedence)
- C08F 220/1808: {C8-(meth)acrylate, e.g. isooctyl (meth)acrylate or 2-ethylhexyl (meth)acrylate}
- C09J 2203/318: for the production of liquid crystal displays
- C09J 2301/122: the adhesive layer being present only on one side of the carrier, e.g. single-sided adhesive tape
- C09J 2301/312: parameters being the characterizing feature
- C09J 2400/226: in the substrate
- C09J 2433/00: Presence of (meth)acrylic polymer
- C09J 2483/00: Presence of polysiloxane
- 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)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)

## Abstract

An adhesive composition, an adhesive film comprising the same, a backplate film comprising the adhesive film, and a plastic organic light emitting display comprising the adhesive film are provided. An adhesive composition includes a (meth)acrylate-based resin, and a polymer having a melting temperature (Tm) of 60° C. or higher, wherein the polymer is a copolymer of a monofunctional polysiloxane and one type of monomer.

## Claims

### Claim 1

An adhesive composition comprising: a (meth)acrylate-based resin; and
a polymer having a melting temperature (Tm) of 60° C. or higher,
wherein the (meth)acrylate-based resin comprises 50 parts by weight to 70 parts by weight of an alkyl acrylate, 5 parts by weight to 40 parts by weight of an alkyl methacrylate, 0.1 parts by weight to 10 parts by weight of a nitrogen-containing monomer, and 1 part by weight to 30 parts by weight of a hydroxyalkyl acrylate,
wherein the polymer is a copolymer of a monofunctional polysiloxane and a monomer,
wherein the monofunctional polysiloxane is included in an amount of greater than or equal to 10 parts by weight and less than or equal to 40 parts by weight, and the monomer is included in an amount of greater than or equal to 60 parts by weight and less than or equal to 90 parts by weight, based on 100 parts by weight of the polymer,
wherein the polymer is included in an amount of 1 part by weight to 10 parts by weight, based on 100 parts by weight of the (meth)acrylate-based resin, and
wherein the monomer is represented by Chemical Formula 1:
wherein, in Chemical Formula 1, X is N or O;
R1 is hydrogen or a methyl group; and
n is an integer of 16 to 24.

### Claim 2 (depends on 1)

The adhesive composition of claim 1, wherein the monomer represented by Chemical Formula 1 is behenyl acrylate (BHA).

### Claim 3 (depends on 1)

The adhesive composition of claim 1, further comprising one or more of a solvent, a dispersant, a photoinitiator, a thermal initiator or a tackifier.

### Claim 4 (depends on 1)

An adhesive film comprising: a base film; and
an adhesive sheet comprising the adhesive composition of claim 1 or a cured material thereof provided on a surface of the base film.

### Claim 5 (depends on 4)

The adhesive film of claim 4, further comprising a release film on a surface of the adhesive sheet, which is opposite to the surface in contact with the base film.

### Claim 6 (depends on 4)

The adhesive film of claim 4, after bonding a surface opposite to the surface in contact with the base film of the adhesive sheet with stainless steel (SUS304 substrate), the adhesive sheet has:
an initial adhesive strength after leaving unattended for 2 hours at 23° C. of 50 gf/inch or less;
a middle adhesive strength after leaving unattended for 24 hours at 23° C. of 55 gf/inch or less; and
a late adhesive strength after leaving unattended for 24 hours at 55° C. of 60 gf/inch or less.

### Claim 7 (depends on 6)

The adhesive film of claim 6, wherein the late adhesive strength/the initial adhesive strength is greater than or equal to 0.3 and less than or equal to 2.0.

### Claim 8 (depends on 4)

The adhesive film of claim 4, wherein the adhesive sheet has a thickness of greater than or equal to 3 μm and less than or equal to 100 μm.

### Claim 9 (depends on 4)

The adhesive film of claim 4, wherein the adhesive film has a thickness of greater than or equal to 50 μm and less than or equal to 300 μm.

### Claim 10 (depends on 4)

A backplate film comprising: the adhesive film of claim 4; and
a protective film provided on the base film of the adhesive film.

### Claim 11 (depends on 4)

A plastic organic light emitting display comprising: the adhesive film of claim 4;
a plastic substrate provided on the adhesive sheet of the adhesive film; and
an organic light emitting layer provided on a surface of the plastic substrate, which is opposite to the surface in contact with the adhesive film.

### Claim 12 (depends on 11)

The plastic organic light emitting display of claim 11, further comprising a protective film provided on the base film of the adhesive film.