Pressure-sensitive adhesive tape and process

• US 4,379,806 A
• Filed: 03/01/1982
• Issued: 04/12/1983
• Est. Priority Date: 07/05/1979
• Status: Expired due to Term

• Current Assignee: Johnson & Johnson
• Original Assignee: Johnson & Johnson
• Inventors: Korpman, Ralf
• Primary Examiner(s): HERBERT JR, THOMAS
• Application Number:
  US06/353,676
• Time in Patent Office: 407 Days
• Field of Search: 428/355, 428/343, 428/354, 428/352, 428/420, 428/480, 428/913, 428/521, 156/244.11, 264/46.1, 264/171, 264/176 R
• US Class Current: 428/354
• CPC Class Codes: C09J 7/22 Plastics; Metallised plastics
• CPC Class Codes: Y10S 428/913 Material designed to be responsive to temperature, light, moisture
• CPC Class Codes: Y10T 428/2839 with release or antistick coating
• CPC Class Codes: Y10T 428/2848 Three or more layers
• CPC Class Codes: Y10T 428/2891 including addition polymer from alpha-beta unsaturated carboxylic acid [e.g., acrylic acid, methacrylic acid, etc.] Or derivative thereof
• CPC Class Codes: Y10T 428/31536 Including interfacial reaction product of adjacent layers
• CPC Class Codes: Y10T 428/31786 Of polyester [e.g., alkyd, etc.]
• CPC Class Codes: Y10T 428/31931 Polyene monomer-containing

Abstract

Pressure-sensitive adhesive tapes with various backing films are prepared by a single step process of coextruding a backing film-forming composition and an adhesive composition. No primer is needed. Tapes with release properties are possible without additional preparative procedure.

Claims

1. A pressure-sensitive adhesive tape comprising

(a) an adhesive layer of a normally tacky thermoplastic pressure-sensitive rubber-resin and

(b) a backing layer of a normally non-tacky thermoplastic film,

wherein said adhesive layer is joined substantially coextensively to said backing layer through an intermediate interlocking layer containing both components in a laminar relationship formed by coextruding an adhesive composition and a thermoplastic film-forming composition, each having a torque value of between about 100 meter grams and 1000 meter grams when worked at 75 r.p.m. at 420°

F. in a Brabender torque dynamometer,

wherein said adhesive composition comprises (i) an elastomeric component and (ii) a tackifier resin component in which the tackifier resin component is present in an amount of from about 20 to 300 parts for each 100 parts by weight of the elastomeric component, and

wherein the elastomeric component of the adhesive composition comprises a block copolymer selected from the group consisting of A--B--A block copolymer, A--B block copolymer and mixtures thereof.

2. A pressure-sensitive adhesive tape according to claim 1 wherein the thermoplastic film-forming composition of the backing layer comprises an A--B--A block copolymer or a mixture thereof with an A--B block copolymer.

3. A pressure-sensitive adhesive tape according to claim 1 wherein the thermoplastic film-forming composition of the backing layer comprising a polymer alloy of an A--B--A block copolymer and a copolyester.

4. A pressure-sensitive adhesive tape according to claim 1 wherein the thermoplastic film-forming composition of the backing layer comprises polyethylene.

5. A pressure-sensitive adhesive tape according to claim 1 wherein the thermoplastic film-forming composition of the backing layer comprises polypropylene.

6. A pressure-sensitive adhesive tape according to claim 1 wherein the thermoplastic film-forming composition of the backing layer comprises plasticized vinyl chloride.

7. A pressure-sensitive adhesive tape according to claim 1 wherein the thermoplastic film-forming composition of the backing layer comprises a copolyester.

8. A pressure-sensitive adhesive tape according to claim 1 wherein the adhesive layer contains a release agent.

9. A pressure-sensitive adhesive tape according to claim 1 wherein the backing layer contains a release agent.