# US 9,039,852 B2 · Method for bonding substrates using a UV radiation curing-redox curing adhesive system

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- Number: US 9,039,852 B2
- Document ID: US9039852B2
- Status: Granted
- Kind: B2
- Application number: 14/162,880
- Filed: 2014-01-24
- Published: 2014-05-22
- Granted: 2015-05-26
- Earliest claimed: 2011-07-25
- Assignees: Henkel IP & Holding GmbH; Henkel (China) Company Limited
- Applicants: Henkel (China) Co. Ltd.; Henkel US IP LLC
- Inventors: Shabbir Attarwala; Nicolas Zhou; Yinxiao Yuan; Daoqiang Lu; Chongjian Song
- Web page: https://patentgrep.com/patent/US9039852B2

## CPC

- C09J 5/06: involving heating of the applied adhesive
- B32B 37/12: characterised by using adhesives
- C09J 5/04: involving separate application of adhesive ingredients to the different surfaces to be joined
- C09J 11/06: organic
- C08K 5/14: Peroxides
- C08K 5/17: Amines; Quaternary ammonium compounds
- C09J 2301/416: use of irradiation
- 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
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

The present invention provides a method for bonding two substrates using a UV radiation curing-redox curing adhesive system having a shadow area and a transparent area, comprising: bonding the shadow area of the substrates using a redox curing adhesive system, and bonding the transparent area of the substrates using a liquid optically clear adhesive containing UV initiators.

## Claims

### Claim 1

A method for bonding two substrates having a shadow area and a transparent area, comprising:
bonding the shadow area of the substrates using a redox curing adhesive system, and bonding the transparent area of the substrates using a liquid optically clear adhesive containing UV initiators.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the reducing component of the redox curing adhesive system is applied on the shadow area of the first substrate, and the liquid optically clear adhesive further containing the oxidizing component of the redox curing adhesive system is applied on the whole area of the second substrate.

### Claim 3 (depends on 1)

The method according to claim 1, wherein while preparing the first substrate, an ink composition incorporated with the reducing component of the redox curing adhesive system is applied on the shadow area, and the liquid optically clear adhesive further containing the oxidizing component of the redox curing adhesive system is applied on the whole area of the second substrate.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the reducing component of the redox curing adhesive system is applied on the shadow area of the first substrate, a shadow adhesive containing the oxidizing component of the redox curing adhesive system is applied on the shadow area of the second substrate, the liquid optically clear adhesive is applied on the transparent area of the second substrate, and a dam adhesive is applied on the second substrate between the shadow adhesive and the liquid optically clear adhesive,
the shadow adhesive is an adhesive either optically clear or opaque,
the dam adhesive is an optically clear adhesive having a viscosity of 20000-60000 cps at 25° C.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the reducing component and the oxidizing component of the redox curing adhesive system are distributed and mixed simultaneously on the shadow area of the second substrate, and the liquid optically clear adhesive is applied on the transparent area of the second substrate, then the first substrate and the second substrate are bonded together.

### Claim 6 (depends on 1)

The method according to claim 1, wherein after coating the redox curing adhesive system and the liquid optically clear adhesive between the first substrate and the second substrate, the method further comprises the following steps:
laminating the above two substrates, and curing the two substrates using UV spot pre-cure;
conducting inspection to see if defects exist between the bonded substrates, and rework if necessary;
curing the liquid optically clear adhesive in the transparent area using UV radiation, and the bonded substrates are left at room temperature for 24 hours for redox curing.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the oxidizing component of the redox curing adhesive system is one or more kinds of peroxides.

### Claim 8 (depends on 1)

The method according to claim 1, wherein the reducing agent in the redox curing adhesive system is selected from one or more of amine, pyridine, aldehyde-amine condensates and thiourea derivatives.

### Claim 9 (depends on 1)

The method according to claim 1, wherein copper acetylacetonate is added to the redox curing adhesive system as a redox curing reaction accelerator.

### Claim 10 (depends on 1)

The method according to claim 1, wherein the UV initiator is 1-hydroxy-cyclohexyl-phenyl ketone or diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide.