Water-based adhesive composition, method for manufacturing same, and adhesive film

Patent metadata

Field	Value
Publication number	US-9458360-B2
Application number	US-201013384988-A
Country	US
Kind code	B2
Filing date	Jul 30, 2010
Priority date	Aug 25, 2009
Publication date	Oct 4, 2016
Grant date	Oct 4, 2016

Abstract

The present invention relates to a water-based adhesive composition, to a method for manufacturing same, and to an adhesive film. The water-based adhesive composition according to the present invention has excellent physical properties such as detachability and reworkability, and can stably prevent changes in the physical properties thereof caused by longitudinal or environmental factors. In addition, the water-based adhesive composition according to the present invention has excellent wettability with respect to various adherends. Accordingly, the water-based adhesive composition according to the present invention can be effectively applied to various industrial adhesive products such as adhesive films for advertisements.

First claim

The invention claimed is:

1. An adhesive film used for advertisement comprising:
a base film including a soft white PVC film having printability; and
an adhesive layer formed on one or opposite sides of the base film and comprising a cured material of a water-based adhesive composition comprising a waterborne adhesive resin and having a concentration of ionic components of 100 ppm or less,
wherein the waterborne adhesive resin is prepared by emulsion polymerization, and the emulsion polymerization is conducted in the presence of 0.01 to 1 wt % of an oxidation-reduction catalyst in the total components in a reactor involved in the emulsion polymerization,
wherein the waterborne adhesive resin has a particle diameter of 100 to 500 nm, a weight average molecular weight of 50,000 to 700,000 and comprises a polymer of a monomer mixture including 90 to 99.9 parts by weight of a (meth)acrylic acid ester monomer having a C2 to C8 alkyl groups and 0.1 to 10 parts by weight of a crosslinking monomer,
wherein the crosslinking monomer comprises at least one selected from the group consisting of a hydroxyl group containing monomer, a carboxyl group containing monomer, a nitrogen containing monomer, and a glycidyl group containing monomer,
wherein the adhesive film has a reduction in peel strength of 6% or less after being aged at 70° C. for 72 hours based on the adhesive layer having an initial peel strength between 1719 and 1751 gf/25 mm,
wherein the reduction in peel strength occurs between the adhesive film and a surface to which the adhesive film is attached,
wherein the waterborne adhesive resin has a glass transition temperature of −60 to −10° C.,
wherein the water-based adhesive composition further comprises 0.1 to 5 parts by weight of a wetting agent based on 100 parts by weight of the waterborne adhesive resin,
wherein the wetting agent is represented by Formula 1:

 where R1 to R4 each independently represent a straight chain or branched chain alkyl group, and
wherein R1 to R4 each independently represent a C1 to C8 alkyl group.

2. The adhesive film of claim 1 , wherein the adhesive layer has a thickness of 0.5 to 50 μm.

3. The adhesive film of claim 1 , further comprising a release film formed on one or both of the adhesive layer(s).

4. The adhesive film of claim 1 , wherein the water-based adhesive composition further comprises 0.01 to 10 parts by weight of a crosslinker based on 100 parts by weight of the waterborne adhesive resin.

5. The adhesive film of claim 4 , wherein the crosslinker comprises at least one selected from the group consisting of an isocyanate compound, a metal chelate compound, an aziridine compound, and an epoxy compound.

6. The adhesive film of claim 1 , wherein the water-based adhesive composition further comprises at least one selected from the group consisting of a tackifier, an initiator, low-molecular weight materials, an epoxy resin, a UV stabilizer, an antioxidant, a coloring agent, a reinforcing agent, an antifoaming agent, a plasticizer, a foaming agent, an organic salt, a thickening agent, and a flame retardant.

7. An adhesive film used for advertisement comprising:
a base film including a soft white PVC film having printability; and
an adhesive layer formed on one or opposite sides of the base film and comprising a cured material of a water-based adhesive composition comprising a waterborne adhesive resin and having a concentration of ionic components of 100 ppm or less,
wherein the waterborne adhesive resin has a particle diameter of 100 to 500 nm, a weight average molecular weight of 50,000 to 700,000 and comprises a polymer of a monomer mixture including 90 to 99.9 parts by weight of a (meth)acrylic acid ester monomer having a C2 to C8 alkyl groups and 0.1 to 10 parts by weight of a crosslinking monomer,
wherein the crosslinking monomer comprises at least one selected from the group consisting of a hydroxyl group containing monomer, a carboxyl group containing monomer, a nitrogen containing monomer, and a glycidyl group containing monomer,
wherein the adhesive film has a reduction in peel strength of 6% or less after being aged at 70° C. for 72 hours based on the adhesive layer having an initial peel strength between 1719 and 1751 gf/25 mm,
wherein the reduction in peel strength occurs between the adhesive film and a surface to which the adhesive film is attached,
wherein the waterborne adhesive resin has a glass transition temperature of −60 to −10° C.,
wherein the water-based adhesive composition further comprises 0.1 to 5 parts by weight of a wetting agent based on 100 parts by weight of the waterborne adhesive resin,
wherein the wetting agent is represented by Formula 1:

 where R1 to R4 each independently represent a straight chain or branched chain alkyl group, and
wherein R1 to R4 each independently represent a C1 to C8 alkyl group.

Assignees

• Kim Jang Soon
• Cho Ik Hwan
• Lim Dong Hoon
• Lg Hausys Ltd

Inventors

• Kim Jang Soon
• Cho Ik Hwan
• Lim Dong Hoon

Classifications

• C09J133/068

  containing glycidyl groups · CPC title

• C09J133/066

  containing -OH groups · CPC title

• C09J7/0278

  Chemistry & Metallurgy · mapped topic

• Y10T428/28

  Web or sheet containing structurally defined element or component and having an adhesive outermost layer · CPC title

• C09J2203/334

  as a label · CPC title