Pressure-sensitive adhesives for bonding printing plates

Patent metadata

Field	Value
Publication number	US-9260637-B2
Application number	US-201414587080-A
Country	US
Kind code	B2
Filing date	Dec 31, 2014
Priority date	Mar 6, 2009
Publication date	Feb 16, 2016
Grant date	Feb 16, 2016

Abstract

Crosslinked pressure-sensitive adhesive comprising at least one base polymer component obtainable by free-radical copolymerization of the following monomers:
a) linear acrylic esters having 2 to 10 C atoms in the alkyl radical, b) branched, non-cyclic acrylic esters having a glass transition temperature T g (based on the DSC measurement to DIN 53765) of not more than −20° C., c) 8% to 15% by weight of acrylic acid, d) optionally up to 10% by weight of further copolymerizable monomers,

characterized in that the ratio of the linear acrylic esters to the branched acrylic esters is in the range from 1:6 to 10:1 mass fractions.

First claim

The invention claimed is:

1. Crosslinked pressure-sensitive adhesive comprising at least one polymer component obtained by free-radical copolymerization of the following monomers exclusively:
a) linear acrylic esters having 2 to 10 C atoms in the alkyl radical,
b) branched, non-cyclic acrylic esters having a glass transition temperature T g , of not more than −20° C., and
c) acrylic acid, in an amount of from 11% to 15% by weight, based on the total weight of monomers,
wherein the mass ratio of the linear acrylic esters to the branched acrylic esters is in the range from 1:6 to 10:1.

2. Pressure-sensitive adhesive according to claim 1 , said at least one polymer component makes up at least 90% by weight of the pressure-sensitive adhesive.

3. The pressure-sensitive adhesive of claim 2 , wherein said at least one polymer component makes up at least 95% by weight of the pressure-sensitive adhesive.

4. The pressure-sensitive adhesive of claim 3 , wherein said at least one polymer component makes up at least 98% by weight of the pressure-sensitive adhesive.

5. Pressure-sensitive adhesive according to claim 1 , wherein the mass ratio of the linear acrylic esters to the branched acrylic esters is in the range of 1:5 to 9:1.

6. Pressure-sensitive adhesive according to claim 5 , wherein the mass ratio of the linear acrylic esters to the branched acrylic esters is from 1.5:1 to 3.5:1.

7. The pressure-sensitive adhesive of claim 5 , wherein said mass ratio of the linear acrylic esters to the branched acrylic esters is from 2:1 to 3:1.

8. The pressure sensitive adhesive of claim 5 , wherein said mass ratio of the linear acrylic esters to the branched acrylic esters is from 1:2 to 4:1.

9. The crosslinked pressure-sensitive adhesive of claim 1 , wherein said monomers further comprise up to 10% by weight of additional copolymerizable monomers.

10. Pressure-sensitive adhesives according to claim 1 , wherein said liner acrylic ester is butyl acrylate and said branched non-cyclic acrylic ester is 2-ethylhexyl acrylate.

11. A method for bonding flexible printing plates to curved surfaces which comprises bonding said flexible printing plates to said curved surfaces with the pressure-sensitive adhesive of claim 1 .

12. Method of claim 11 , wherein said pressure-sensitive adhesive has a solvent resistance that corresponds to edge lifting of less than 10 mm under the influence of solvent.

13. The method of claim 12 , wherein said edge lifting is less than 5 mm.

Assignees

• Tesa Se

Inventors

• Ellringmann Kai
• Kupsky Marco

Classifications

• C08F120/06

  Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof · CPC title

• C09J133/08 Primary

  Homopolymers or copolymers of acrylic acid esters · CPC title

• B32B37/12

  characterised by using adhesives · CPC title

• B41N6/02

  Chemical means for fastening printing formes on mounting boards · CPC title

• C09J2201/606

  Chemistry & Metallurgy · mapped topic