Substrate-Free Adhesive Tape

Patent metadata

Field	Value
Publication number	US-2021002524-A1
Application number	US-201916979377-A
Country	US
Kind code	A1
Filing date	Aug 6, 2019
Priority date	Aug 8, 2018
Publication date	Jan 7, 2021
Grant date	—

Abstract

A substrate-free adhesive tape that is excellent in adhesive physical properties and is suitable for a continuous process is provided. The substrate-free adhesive tape includes a release film, and an adhesive layer provided on one surface of the release film and the adhesive layer containing a cured product of an adhesive composition, wherein when the release film is fixed on the outer surface of a semicircular tip part of a jig, the semicircular tip part having a radius of 22.5 mm, a breaking distance of the adhesive layer is 110 mm or less when the adhesive layer is stretched at a rate of 20 m/min from a semicircular center of the semicircular tip part toward an outermost direction of the semicircular tip part.

First claim

1 . A substrate-free adhesive tape comprising a release film, and an adhesive layer provided on one surface of the release film and the adhesive layer containing a cured product of an adhesive composition,
wherein when the release film is fixed on the outer surface of a semicircular tip part of a jig the semicircular tip part having a radius of 22.5 mm, a breaking distance of the adhesive layer is 110 mm or less when the adhesive layer is stretched at a rate of 20 m/min from a semicircular center of the semicircular tip part toward an outermost direction of the semicircular tip part.

2 . The substrate-free adhesive tape according to claim 1 ,
wherein the adhesive layer has a travelling distance of 25 mm or less traveled by a ball measured according to ASTM D3121.

3 . The substrate-free adhesive tape according to claim 1 ,
wherein the adhesive composition includes an acrylic copolymer obtained by copolymerization of a monomer mixture containing: an alkyl group-containing (meth)acrylate monomer; a cycloalkyl group-containing (meth)acrylate monomer; a heterocycloalkyl group-containing (meth)acrylate monomer; a polar group-containing (meth)acrylate monomer; and a (meth)acrylate monomer represented by following Chemical Formula 1:

wherein, in Chemical Formula 1, x is 0 or 1, y is an integer of 14 to 23, n is an integer of 2 to 4, and R is a hydrogen atom, a methyl group, or an ethyl group.

4 . The substrate-free adhesive tape according to claim 3 ,
wherein a content of the (meth)acrylate monomer represented by Chemical Formula 1 is 2 parts by weight or more and 15 parts by weight or less based on 100 parts by weight of the monomer mixture.

5 . The substrate-free adhesive tape according to claim 3 ,
wherein a content of the polar group-containing (meth)acrylate monomer is 3 parts by weight or more and 7 parts by weight or less based on 100 parts by weight of the monomer mixture.

6 . The substrate-free adhesive tape according to claim 3 ,
wherein a content of the alkyl group-containing (meth)acrylate monomer is 50 parts by weight or more and 75 parts by weight or less based on 100 parts by weight of the monomer mixture.

7 . The substrate-free adhesive tape according to claim 3 ,
wherein a content of the cycloalkyl group-containing (meth)acrylate monomer is 5 parts by weight or more and 15 parts by weight or less based on 100 parts by weight of the monomer mixture.

8 . The substrate-free adhesive tape according to claim 3 ,
wherein a content of the heterocycloalkyl group-containing (meth)acrylate monomer is 2 parts by weight or more and 7 parts by weight or less based on 100 parts by weight of the monomer mixture.

9 . The substrate-free adhesive tape according to claim 3 ,
wherein the acrylic copolymer has a weight average molecular weight of 800,000 g/mol or more and 1,200,000 g/mol or less.

10 . The substrate-free adhesive tape according to claim 1 ,
wherein the adhesive layer has a thickness of 10 μM or more and 80 μM or less.

11 . The substrate-free adhesive tape according to claim 1 ,
wherein the adhesive composition includes an acrylic copolymer obtained by copolymerization of a monomer mixture containing: an alkyl group-containing (meth)acrylate monomer; a cycloalkyl group-containing (meth)acrylate monomer; a heterocycloalkyl group-containing (meth)acrylate monomer; a polar group-containing (meth)acrylate monomer; and 2-(2-ethoxyethoxy)ethylacrylate.

Assignees

• Lg Chemical Ltd

Inventors

• Seo Ki Seung
• Kim Ji Hye
• Kim Sang Hwan
• Park Jun Hyoung
• Yoon Kyung Jun

Classifications

• Y10T428/2891

  including addition polymer from alpha-beta unsaturated carboxylic acid [e.g., acrylic acid, methacrylic acid, etc.] Or derivative thereof · CPC title

• C09J7/385 Primary

  Acrylic polymers · CPC title

• C09J2301/122

  the adhesive layer being present only on one side of the carrier, e.g. single-sided adhesive tape · CPC title

• C09J133/08 Primary

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C09J2483/005

  in the release coating · CPC title