Hot melt adhesive

Abstract

Disclosed is a hot melt adhesive comprising: (A) a metallocene based propylene homopolymer, (B) a metallocene based ethylene / alpha-olefin copolymer, (C) a tackifier resin, and (D) a plasticizer, wherein the plasticizer (D) comprises (D1) an oil and (D2) at least one polymer selected from polybutene, polybutadiene, polyisobutylene, and polyisoprene. This hot melt adhesive has an initial adhesive strength enough to enable a pressure sensitive adhesion body to stick easily on a member, thus making it possible to firmly hold the pressure sensitive adhesion body on the member. The hot melt adhesiveis also excellent in releasability, thus causing no adhesive residue on the member when the pressure sensitive adhesion body is peeled from the member.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit under the Paris Convention of Japanese Patent Application No. 2017-128174 filed on June 30, 2017, the entire contents of which are incorporated herein by reference. technical field [0003] This invention relates to hot melt adhesives, and more particularly, to hot melt adhesives useful as pressure sensitive adhesives. [0004] As used herein, "pressure sensitive" is a specific concept subordinate to "adhesive", and "adhesive" includes both "pressure sensitive adhesive" and "non-pressure sensitive adhesive". Background technique [0005] Hot-melt adhesives can be used without solvents and allow fast bonding, thus providing environmental and economic benefits. Therefore, hot melt adhesives are used in various fields such as bookbinding, packaging materials, automotive interior materials, and woodworking. [0006] From the viewpoint of flexibility and cost, ethylene-based copolymers...

AI Technical Summary

Problems solved by technology

[0014] The hot-melt adhesives of Patent Documents 1-2 exhibit low tack and poor initial adhesive force, so it is not easy to adhere each pressure-sensitive adhesive tape to various members (or adherends)

Poor holding power due to too low strength when peeled off

[0015] The hot melt adhesive of Patent Document 3 exhibits excessively high strength when the pressure-sensitive adhesive tape is peeled off after being adhered to the member, so that adhesive residue (or adhesive deposit) may occur on the member, and cause Pressure sensitive adhesive tape breaks

[0016] As described above, the olefin-based hot melt adhesives disclosed in Patent Documents 1 to 3 are not suitable as pressure sensitive adhesives

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