Pressure-sensitive adhesive composition and pressure-sensitive tape or sheet

• US 6,630,536 B2
• Filed: 08/28/2001
• Issued: 10/07/2003
• Est. Priority Date: 08/28/2000
• Status: Active Grant

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Kasahara, Tsuyoshi, Sasaki, Yasuyuki, Kuniya, Masayoshi
• Primary Examiner(s): SANDERS, KRIELLION ANTIONETTE
• Application Number:
  US09/939,694
• Publication Number:
  US 20020045043A1
• Time in Patent Office: 770 Days
• Field of Search: 525/95, 525/98, 525/99
• US Class Current: 525/95
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C08L 2666/08 Homopolymers or copolymers according to C08L7/00 - C08L21/00; Derivatives thereof
• CPC Class Codes: C09J 121/00 Adhesives based on unspecified rubbers
• CPC Class Codes: C09J 153/02 Vinyl aromatic monomers and conjugated dienes
• CPC Class Codes: C09J 2423/006 in the substrate
• CPC Class Codes: C09J 2429/006 in the substrate
• CPC Class Codes: C09J 2431/006 in the substrate
• CPC Class Codes: C09J 2433/006 in the substrate
• CPC Class Codes: C09J 7/387 Block-copolymers
• CPC Class Codes: Y10T 428/28 Web or sheet containing structurally defined element or component and having an adhesive outermost layer
• CPC Class Codes: Y10T 428/2852 Adhesive compositions

Abstract

A pressure-sensitive adhesive composition comprises: 100 parts by weight of a rubber component that is solid in an ordinary temperature; 30 to 170 parts by weight of a rubber component that is liquid in an ordinary temperature; and 50 to 400 parts by weight of a tackifier, wherein the amount of the tackifier is 25 to 80 parts by weight based on 100 parts by weight of the total amount of the rubber components.

Claims

1. A pressure-sensitive adhesive composition comprising:

100 parts by weight of a rubber component that is solid in an ordinary temperature;

30 to 170 parts by weight of a rubber component that is liquid at 25°

C.; and

50 to 400 parts by weight of a tackifier,

wherein the amount of the tackifier is 25 to 80 parts by weight based on 100 parts by weight of the total amount of the rubber components.

2. The pressure-sensitive adhesive composition according to claim 1, wherein the rubber component that is solid in an ordinary temperature is at least one of an A-B block copolymer and an A-B-A block copolymer.

3. The pressure-sensitive adhesive composition according to claim 1, wherein the rubber component that is liquid in an ordinary temperature is at least one selected from the group consisting of a liquid polyisoprene and a derivative thereof, a liquid polybutadiene, a liquid polyisobutylene, a liquid polybutene, a liquid styrene-isoprene copolymer, and a liquid isoprene-butadiene copolymer.

4. The pressure-sensitive adhesive composition according to claim 1, wherein the tackifier is at least one selected from the group consisting of:

natural resins of a terpene resin and a rosin resin or a derivative thereof; and

synthetic resins of an aliphatic resin, an aromatic resin, a petroleum resin, an alkyl phenol resin, a xylene resin, and a coumarone indene resin.

5. The pressure-sensitive adhesive composition according to claim 1, wherein the amount of the rubber component that is liquid in an ordinary temperature is 40 to 115 parts by weight based on 100 parts by weight of the rubber component that is solid in an ordinary temperature.

6. The pressure-sensitive adhesive composition according to claim 1, wherein the amount of the tackifier is 40 to 70 parts by weight based on 100 parts by weight of the total amount of the rubber components.