# US 5,702,771 A · Activated adhesive system

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- Number: US 5,702,771 A
- Document ID: US5702771A
- Status: Granted
- Kind: A
- Application number: 08/450,701
- Filed: 1995-05-25
- Granted: 1997-12-30
- Earliest claimed: 1994-02-22
- Inventors: Adele C. Shipston; Joseph W. Langen; Nancy G. Mitchell
- Web page: https://patentgrep.com/patent/US5702771A

## CPC

- C09J 7/35: Heat-activated
- Y10T 428/2809: including irradiated or wave energy treated component
- Y10T 428/2848: Three or more layers
- Y10T 428/2878: including addition polymer from unsaturated monomer
- Y10T 428/2891: including addition polymer from alpha-beta unsaturated carboxylic acid [e.g., acrylic acid, methacrylic acid, etc.] Or derivative thereof
- 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)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method of increasing the tack of a pressure sensitive adhesive by exposing a polymeric pressure sensitive adhesive to an activating treatment, activatable articles containing such an adhesive and adhesive compositions resulting from such an activating treatment. The activatable, polymeric, pressure sensitive adhesive is preferably a water based adhesive prepared by free radical polymerization of acrylic acid, methacrylic acid, acrylate, or methacrylate monomers having from 1 to about 12 carbon atoms. The activating treatment is preferably corona charging or corona charging in combination with uv light.

## Claims

### Claim 1

A method for producing a pressure sensitive adhesive comprising:
coating a substrate over at least a portion of at least one side thereof with a non-tacky polymeric composition capable of being activated upon exposure to an activating treatment; and
exposing the coated substrate to an activating treatment comprising ultraviolet light, corona charging, ultrasound or combinations thereof to activate the polymeric composition, thereby producing a tacky pressure sensitive adhesive.

### Claim 2 (depends on 1)

The method of claim 1, wherein the substrate is paper.

### Claim 3 (depends on 1)

The method of claim 1, wherein the activating treatment further comprises heating.

### Claim 4 (depends on 1)

The method of claim 1, wherein the activating treatment is corona charging.

### Claim 5 (depends on 1)

The method of claim 1, wherein the activating treatment is corona charging in combination with ultraviolet light.

### Claim 6 (depends on 1)

The method of claim 1, wherein the activating treatment is ultraviolet light.

### Claim 7 (depends on 1)

The method of claim 1, wherein the non-tacky polymeric composition is selected from polymers or copolymers of acrylates, methacrylates, acrylic acid, methacrylic acid, natural rubbers or polyethers.

### Claim 8 (depends on 7)

The method of claim 7, wherein the non-tacky polymeric composition is a water based adhesive prepared by free radical polymerization of acrylic acid, methacrylic acid, acrylate, or methacrylate monomers having from 1 to about 12 carbon atoms.

### Claim 9 (depends on 8)

The method of claim 8, wherein the non-tacky polymeric composition is a polymer or copolymer based on 70 to 100% of a soft monomer, 0 to 6% of a functional monomer and 0-30% of a hard monomer.

### Claim 10 (depends on 9)

The method of claim 9, wherein the soft monomer is selected from 2-ethylhexyl acrylate, isooctyl acrylate and isodecyl acrylate.

### Claim 11 (depends on 10)

The method of claim 10, wherein the 2-ethylhexyl acrylate is crosslinked with trimethylolpropane trimethacrylate.

### Claim 12 (depends on 8)

The method of claim 8, wherein the functional monomer is acrylic acid.

### Claim 13 (depends on 8)

The method of claim 8, wherein the hard monomer is vinyl acetate.