Adhesive film

Patent metadata

Field	Value
Publication number	US-12043775-B2
Application number	US-201716345519-A
Country	US
Kind code	B2
Filing date	Aug 28, 2017
Priority date	Oct 26, 2016
Publication date	Jul 23, 2024
Grant date	Jul 23, 2024

Abstract

In one embodiment, there is provided an adhesive film having (α) a layer of polyvinyl chloride resin film and (β) an adhesive layer in the stated order from the surface-layer side, where the (β) adhesive layer is formed from an adhesive including: (A) 100 parts by mass of an acrylic polymer that satisfies the features (a1) and (a2), specifically (a1) an acid value of 18-27 mg KOH/g, and (a2) a mass-average molecular weight of 500,000 to 1,000,000; and (B) 0.1-3 parts by mass of a compound having two or more isocyanate groups per molecule. In another embodiment, there is provided an adhesive film having (α) a layer of polyvinyl chloride resin film and (β) an adhesive layer in the stated order from the surface-layer side, where the (β) adhesive layer has a tackiness of 12-25 N at a surface temperature of 5° C. and has a tackiness of 12-23 N at a surface temperature of 35° C.

First claim

The invention claimed is:

1. A pressure-sensitive adhesive film, comprising:
(α) a layer of a polyvinyl chloride resin film and (β) a pressure-sensitive adhesive layer in this order from a surface layer side,
wherein a surface of the pressure-sensitive adhesive layer (β) has a tackiness of 12 to 25 N at a temperature of 5° C., and the surface of the pressure-sensitive adhesive layer (β) has a tackiness of 12 to 23 N at a temperature of 35° C.,
wherein the pressure-sensitive adhesive layer comprises a pressure sensitive adhesive comprising an acrylic polymer having a mass average molecular weight of from 500,000 to 1,000,000, as the only acrylic polymer, and a compound having two or more isocyanate groups per molecule, the compound having two or more isocyanate groups per molecule being contained in the adhesive in an amount of 1 to 1.6 parts by mass relative to 100 parts by mass of the acrylic polymer,
wherein the acrylic polymer is comprised of comonomers comprising at least one carboxyl group-containing monomer,
wherein the acrylic polymer has an acid value of 18 to 27 mg KOH/g,
wherein the acrylic polymer is comprised of constituent units derived from acrylic acid, butyl acrylate, and a hydroxyl group-containing acrylic monomer,
wherein the pressure-sensitive adhesive has a gel fraction of 45 to 75 mass %,
wherein the tackiness at a temperature of 5° C. is determined as follows: after the pressure-sensitive adhesive film is conditioned in an environment of a temperature of 5° C. and 50% relative humidity for 24 hours or more, the tackiness is measured in the same environment using a tackiness checker with a contact being a flat surface indenter under the conditions of a contact press force of 5 N, a press time of 3 seconds, and a number of repetition of tests of 5 times, and
wherein the tackiness at a temperature of 35° C. is determined as follows: after the pressure-sensitive adhesive film is conditioned in an environment of a temperature of 35° C. and 50% relative humidity for 24 hours or more, the tackiness is measured in the same environment using a tackiness checker with a contact being a flat surface indenter under the conditions of a contact press force of 5 N, a press time of 3 seconds, and a number of repetition of tests of 5 times, and
wherein a resin composition constituting the polyvinyl chloride resin film contains a polyvinyl chloride resin and a (meth)acrylic core-shell rubber.

2. The pressure-sensitive adhesive film according to claim 1 , wherein the pressure-sensitive adhesive that forms the pressure-sensitive adhesive layer (β) satisfies property (b1) shown below:
(b1) the pressure-sensitive adhesive has a peak top value of tan δ on the lowest temperature side of −20° C. to −5° C.

3. The pressure-sensitive adhesive film according to claim 1 , wherein the pressure-sensitive adhesive layer (β) has an air vent groove in an adhesive surface thereof.

4. The pressure-sensitive adhesive film according to claim 1 that is used for wallpaper.

5. The pressure-sensitive adhesive film according to claim 1 , wherein the polyvinyl chloride resin film has a yield point stress of 30 to 39 MPa as measured at a temperature of 5° C.

6. The pressure-sensitive adhesive film according to claim 1 , wherein the mass average molecular weight of the acrylic polymer is greater than 600,000 and 1,000,000 or less.

7. The pressure-sensitive adhesive film according to claim 1 , wherein the (meth)acrylic core-shell rubber comprises a methacrylic acid ester-styrene/acrylic acid ester rubber graft copolymer.

8. The pressure-sensitive adhesive film according to claim 1 , wherein the resin composition constituting the polyvinyl chloride resin film further contains a phthalate plasticizer that is dinormal octyl phthalate.

Assignees

• Riken Technos Corp

Inventors

• Inomata Hitomi
• WAKUGAWA Takio

Classifications

• C09J175/04

  Polyurethanes · CPC title

• B32B27/30

  comprising vinyl {(co)polymers; comprising acrylic (co)polymers} · CPC title

• B32B27/00

  Layered products comprising {a layer of} synthetic resin {(fibrous or filamentary layer made of a synthetic resin B32B5/02; particulate layer made of a synthetic resin B32B5/16; foamed layer made of a synthetic resin B32B5/18)} · CPC title

• C09J133/00

  Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers · CPC title

• C09J133/10

  Homopolymers or copolymers of methacrylic acid esters · CPC title