Adhesive composition and adhered structure which thermally peeled with ease

• US 20040037990A1
• Filed: 01/16/2003
• Published: 02/26/2004
• Est. Priority Date: 07/31/2000
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Abe, Hideotoshi, Takamatsu, Yorinobu
• Granted Patent: US 6,946,177 B2
• Time in Patent Office: Days
• US Class Current: 428/40.1
• CPC Class Codes: C08L 2666/18 Polyesters or polycarbonates according to C08L67/00 - C08L69/00; Derivatives thereof
• CPC Class Codes: C08L 33/06 of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
• CPC Class Codes: C08L 33/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C08L 67/04 Polyesters derived from hydroxycarboxylic acids, e.g. lactones C08L67/06 takes precedence
• CPC Class Codes: C09J 133/06 of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
• CPC Class Codes: Y10T 428/14 Layer or component removable to expose adhesive
• CPC Class Codes: Y10T 428/1405 Capsule or particulate matter containing [e.g., sphere, flake, microballoon, etc.]
• 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

An adhesive composition having (i) a tackifying polymer and (ii) a crystalline polymer, such that the content of the tackifying polymer is from 55 to 95 wt. % based on the whole weight of the composition, and the content of the crystalline polymer is from 4 to 40 wt. % based on the whole weight of the composition, where the said crystalline polymer comprises polycaprolactone, and the tackifying polymer comprises a polymer that is compatible with said polycaprolactone when the composition is heated to the melting point of the polycaprolactone and is crosslinked.

Claims

1. An adhesive composition comprising (I) a tackifying polymer and (II) a crystalline polymer, wherein the content of said tackifying polymer is from 55 to 95 wt. % based on the whole weight of the composition, and the content of said crystalline polymer is from 4 to 40 wt. % based on the whole weight of the composition,

characterized in that

said crystalline polymer comprises polycaprolactone, and

said tackifying polymer comprises a polymer which is compatible with said polycaprolactone when the composition is heated to the melting point of said polycaprolactone and is crosslinked.

2. The adhesive composition according to claim 1, which further comprises a crosslinking component, wherein said polymer compatible with said polycaprolactone is a polymer having (a) a hydroxyl group, (b) a phenyl group and (c) a crosslinkable functional group reactive with said crosslinking component.

3. The adhesive composition according to claim 2, wherein said polymer compatible with said polycaprolactone is an acrylic polymer obtained by polymerizing a monomer mixture containing (A) a (meth)acrylic monomer having a hydroxyl group in the molecule, (B) a (meth)acrylic monomer having a phenyl group in the molecule, (C) a (meth)acrylic monomer having said crosslinkable functional group in the molecule, and (D) an alkyl acrylate having 4 to 10 carbon atoms in the alkyl group.

4. An adhered structure which is thermally peeled with ease, comprising an adherent, an adhesive layer comprising the adhesive composition according to any one of claims 1 to 3, and an article adhered to said adhesive layer, wherein said article can be peeled off without leaving said adhesive on said adherent when it is heated to a specific temperature on a desired occasion.