# US 2022/0033686 A1 · Structural adhesive tape and method of manufacturing the same

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- Number: US 2022/0033686 A1
- Document ID: US20220033686A1
- Status: Published application
- Kind: A1
- Application number: 17/109,684
- Filed: 2020-12-02
- Published: 2022-02-03
- Earliest claimed: 2020-07-30
- Assignees: Hyundai Motor Company; Kia Motors Corporation; Shinsung Industrial Co., Ltd.
- Applicants: Hyundai Motor Company; Kia Motors Corporation; Shinsung Industrial Co., Ltd.
- Inventors: Sung Chul Shin; Jong Sub Lim
- Web page: https://patentgrep.com/patent/US20220033686A1

## CPC

- C09J 7/20: characterised by their carriers
- B32B 15/02: {Layer formed of wires, e.g. mesh}
- B32B 37/00: Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B 38/0004: {Cutting, tearing or severing, e.g. bursting; Cutter details (cutting in general B26D; laminating combined with punching or perforating B32B38/04; removing all or part of the layers B32B38/10; cutting in combination with laying up and registration B32B38/185 takes precedence)}
- C08G 59/4021: {Ureas; Thioureas; Guanidines; Dicyandiamides}
- C08K 3/013: Fillers, pigments or reinforcing additives
- C08K 3/04: Carbon
- C08K 3/36: Silica
- C08K 5/0016: {Plasticisers}
- C08K 5/0025: {Crosslinking or vulcanising agents; including accelerators}
- C08K 5/21: Urea; Derivatives thereof, e.g. biuret
- C08K 5/3155: {Dicyandiamide}
- C08L 75/04: Polyurethanes
- C09J 7/21: Paper; Textile fabrics
- C09J 163/00: Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
- C08K 2003/2206: {of calcium, strontium or barium}
- C08K 2003/265: {Calcium, strontium or barium carbonate}
- C08K 2003/3045: {Sulfates}
- C08K 2003/321: {Phosphates}
- C09J 7/26: Porous or cellular plastics
- C09J 7/38: Pressure-sensitive adhesives [PSA]
- C09J 2301/122: the adhesive layer being present only on one side of the carrier, e.g. single-sided adhesive tape
- C09J 2301/124: the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
- C09J 2301/312: parameters being the characterizing feature
- C09J 2301/408: additives as essential feature of the adhesive layer
- C09J 2400/143: in the substrate
- C09J 2400/263: in the substrate
- C09J 2421/00: Presence of unspecified rubber
- C09J 2463/00: Presence of epoxy resin
- C09J 2467/006: in the substrate
- C09J 2475/00: Presence of polyurethane
- 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
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- 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)

## Abstract

Disclosed are a structural adhesive tape in which a mesh layer is located on one side or both sides of an adhesive layer, and a method of manufacturing the same. The mesh layer having a specific specification may be used and an adhesive layer including an epoxy resin with a solid phase and a liquid phase and a flame retardant plasticizer may be used introduced so that a tape sagging phenomenon can be solved while minimizing degradation in adhesive strength. In addition, the mesh layer may be used so that a usage temperature range may be extended from a range ranging from about 5° C. to about 35° C. to a range ranging from about 0° C. to about 40° C., and thus workability in high and low temperature ranges may be improved such that tape workability can be improved even in overseas factories with poor temperature conditions.

## Claims

### Claim 1

A structural adhesive tape, comprising:
a mesh layer; and
an adhesive layer located on one side or both sides of the mesh layer,
wherein the adhesive layer comprises an amount of 35 to 45 wt % of an epoxy resin, an amount of 20 to 25 wt % of an inorganic filler, an amount of 5 to 10 wt % of a moisture scavenger, an amount of 2 to 5 wt % of a flame retardant plasticizer, an amount of 10 to 20 wt % of rubber particles, an amount of 2.5 to 4 wt % of a hardener, and an amount of 10 to 15 wt % of an urethane resin, based on the total weight of the structural adhesive tape.

### Claim 2 (depends on 1)

The structural adhesive tape of claim 1, wherein the epoxy resin comprises an amount of 25 to 30 wt % in a solid phase and an amount of 10 to 15 wt % in a liquid phase, based on the total weight of the structural adhesive tape.

### Claim 3 (depends on 1)

The structural adhesive tape of claim 1, wherein the adhesive layer further comprises an amount of 0.05 to 0.1 wt % of a pigment, an amount of 1 to 2 wt % of a hydrophobic silica, and an amount of 0.5 to 1 wt % of an urea, based on the total weight of the structural adhesive tape.

### Claim 4 (depends on 1)

The structural adhesive tape of claim 1, wherein the epoxy resin comprises one or more selected from the group consisting of a bisphenol A epoxy and a bisphenol F epoxy.

### Claim 5 (depends on 1)

The structural adhesive tape of claim 1, wherein the inorganic filler comprises one or more selected from the group consisting of calcium carbonate and barium sulfate.

### Claim 6 (depends on 1)

The structural adhesive tape of claim 1, wherein the moisture scavenger comprises calcium oxide.

### Claim 7 (depends on 1)

The structural adhesive tape of claim 1, wherein the flame retardant plasticizer comprises tricresyl phosphate.

### Claim 8 (depends on 1)

The structural adhesive tape of claim 1, wherein the rubber particles comprise core-shell rubber.

### Claim 9 (depends on 1)

The structural adhesive tape of claim 1, wherein the hardener comprises dicyandiamide.

### Claim 10 (depends on 1)

The structural adhesive tape of claim 1, wherein the urethane resin comprises one or more selected from the group consisting of hexamethylene diisocyanate (HDI) and methane diisocyanate (MDI).

### Claim 11 (depends on 3)

The structural adhesive tape of claim 3, wherein the pigment comprises carbon black.

### Claim 12 (depends on 1)

The structural adhesive tape of claim 1, wherein the mesh layer comprises one or more selected from the group consisting of a polyester (PES) fiber, a glass fiber, a polyethylene terephthalate (PET) fiber, and a fabric.

### Claim 13 (depends on 1)

The structural adhesive tape of claim 1, wherein the mesh layer has a size ranging from 40 mesh to 60 mesh, fineness ranging from 75 D to 200 D, and a density ranging from 20 T/inch to 30 T/inch.

### Claim 14 (depends on 1)

The structural adhesive tape of claim 1, wherein shear strength ranges from 29 MPa to 35 MPa, delamination strength ranges from 290 M/25 mm to 320 M/25 mm, penetration ranges from 10 mm to 12 mm, and sagging ranges from 1% to 5%.

### Claim 15

A method of manufacturing a structural adhesive tape, comprising:
manufacturing an adhesive layer by adding an adhesive tape composition to a release paper;
manufacturing a laminated body by laminating a mesh layer on the adhesive layer;
removing scraps in the mesh layer; and
cutting the laminated body from which the scraps have been removed,
wherein the adhesive tape composition comprises an amount of 35 to 45 wt % of an epoxy resin, an amount of 20 to 25 wt % of an inorganic filler, an amount of 5 to 10 wt % of a moisture scavenger, an amount of 2 to 5 wt % of a flame retardant plasticizer, an amount of 10 to 20 wt % of rubber particles, an amount of 2.5 to 4 wt % of a hardener, and an amount of 10 to 15 wt % of an urethane resin, based on the total weight of the structural adhesive tape.

### Claim 16 (depends on 15)

The method of claim 15, wherein the epoxy resin comprises an amount of 25 to 30 wt % in a solid phase and an amount of 10 to 15 wt % in a liquid phase, based on the total weight of the structural adhesive tape.

### Claim 17 (depends on 15)

The method of claim 15, wherein the adhesive layer further comprises an amount of 0.05 to 0.1 wt % of a pigment, an amount of 1 to 2 wt % of a hydrophobic silica, and an amount of 0.5 to 1 wt % of an urea, based on the total weight of the structural adhesive tape.

### Claim 18 (depends on 15)

The method of claim 15, wherein the epoxy resin includes one or more selected from the group consisting of a bisphenol A epoxy and a bisphenol F epoxy.

### Claim 19 (depends on 15)

The method of claim 15, wherein the mesh layer has a size ranging from 40 mesh to 60 mesh, fineness ranging from 75 D to 200 D, and a density ranging from 20 T/inch to 30 T/inch.

### Claim 20 (depends on 15)

The method of claim 15, wherein the removing of the scraps is performed using a heating tool.