# US 4,393,117 A · Hot melt transfer coating process and products

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- Number: US 4,393,117 A
- Document ID: US4393117A
- Status: Granted
- Kind: A
- Application number: 06/282,581
- Filed: 1981-07-13
- Granted: 1983-07-12
- Earliest claimed: 1981-07-13
- Assignees: Ludlow Corporation
- Inventors: George O. Stricker; Karl H. Teumer; Ronald C. Groenendal
- Web page: https://patentgrep.com/patent/US4393117A

## CPC

- B05C 9/04: for applying liquid or other fluent material to opposite sides of the work
- B05D 5/10: to obtain an adhesive surface
- C09J 7/21: Paper; Textile fabrics
- B05D 2201/00: Polymeric substrate or laminate
- B05D 2252/02: of indefinite length
- B05D 2252/10: Applying the material on both sides
- B05D 2401/30: the coating being applied in other forms than involving eliminable solvent, diluent or dispersant
- C09J 2400/283: in the substrate
- Y10S 428/906: Roll or coil
- Y10T 428/2839: with release or antistick coating
- B05C: APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (spraying apparatus, atomising apparatus, nozzles B05B; plant for applying liquids or other fluent materials to objects by electrostatic spraying B05B5/08)
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- 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)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An improved process for coating a pressure sensitive adhesive upon a differential-release-type substrate and the products produced thereby. The coating procedure involves using a solvent-free hot-melt adhesive coating system and a short period of exposure to the environment of the web being processed between the time the web is coated with adhesive and spooled for packaging.

## Claims

### Claim 1

In a process for placing a releasable pressure-sensitive adhesive coating on an unspooled web which is being unwound from a supply spool and which comprises a first side having a first release coating having relatively high peel strength with respect to said adhesive coating, and a second side having a second release coating having relatively low peel strength affinity with respect to said adhesive coating, and thereupon spooling the resulting adhesive-coated web onto a packaging spool so that the surface of the adhesive coating contacts the second side of said substrate;
the improvement wherein said adhesive coating is applied as a substantially solvent-free hot-melt coating, said adhesive coating is caused to solidify by positive cooling applied to the unspooled web, wherein said cooling is controlled so that moisture condensation on the web is substantially avoided, and wherein the entire supply spool-to-packaging spool travel time of said web is a period of about 0.5 to 5 seconds.

### Claim 2 (depends on 1)

A process as defined in claim 1 wherein said travel time is less than 2 seconds.

### Claim 3 (depends on 1, 2)

A process as defined in claims 1 or 2 wherein said release coatings are formed of two-distinct organic-resin-based polymers.

### Claim 4 (depends on 1, 2)

A process as defined in claims 1 or 2 wherein chill rolls are used to cool said web between coating with adhesive and spooling.

### Claim 5 (depends on 1, 2)

A process as defined in claims 1 or 2 wherein said release coatings are formed of two-distinct organic-resin-based polymers, at least one of which is a silicone-resin based polymer.

### Claim 6 (depends on 1, 2)

A spooled product bearing a releasable pressure sensitive adhesive thereon and formed by the process defined in claims 1 or 2.

### Claim 7 (depends on 3)

A spooled product bearing a releasable pressure sensitive adhesive thereon and formed by the process defined in claim 3.

### Claim 8 (depends on 5)

A spooled product bearing a releasable pressure sensitive adhesive thereon and formed by the process defined in claim 5.

### Claim 9 (depends on 1, 3)

A spool of a pressure-sensitive adhesive-bearing web made by the process of claims 1 or 3 and of the type wherein each side of the web comprises a different silicone release coating, and wherein said silicone release coatings have a maximum peel release ratio of about 4:1 with respect to their adhesion to said adhesive.