RADIATION-CURABLE MIXTURE CONTAINING LOW-MOLECULAR, ETHYLENICALLY UNSATURATED COMPOUNDS HAVING NON-AROMATIC RING SYSTEMS

• US 20090324945A1
• Filed: 10/29/2007
• Published: 12/31/2009
• Est. Priority Date: 10/27/2006
• Status: Active Grant

• Current Assignee: BASF AG (BASF SE)
• Original Assignee: BASF SE
• Inventors: Duesterwald, Uwe, Licht, Ulrike, Wulff, Dirk
• Granted Patent: US 9,725,549 B2
• Time in Patent Office: Days
• US Class Current: 428/355.00R
• CPC Class Codes: C08F 265/04 on to polymers of esters
• CPC Class Codes: C08F 265/06 Polymerisation of acrylate or methacrylate esters on to polymers thereof
• CPC Class Codes: C08F 290/06 Polymers provided for in subclass C08G
• CPC Class Codes: C08F 290/061 Polyesters; Polycarbonates
• CPC Class Codes: C08F 299/02 from unsaturated polycondensates
• CPC Class Codes: C08K 5/3477 Six-membered rings
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 51/003 grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds C08L51/04, C08L51/06 take precedence
• CPC Class Codes: C09J 133/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C09J 151/003 grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds C09J151/04, C09J151/06 take precedence
• CPC Class Codes: C09J 2301/302 the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C
• CPC Class Codes: C09J 2433/00 Presence of (meth)acrylic polymer
• CPC Class Codes: C09J 7/385 Acrylic polymers
• CPC Class Codes: Y10T 428/2809 including irradiated or wave energy treated component
• CPC Class Codes: Y10T 428/2852 Adhesive compositions
• CPC Class Codes: Y10T 428/2891 including addition polymer from alpha-beta unsaturated carboxylic acid [e.g., acrylic acid, methacrylic acid, etc.] Or derivative thereof

Abstract

A mixture comprising

• A) a polymer obtainable by polymerizing free-radically polymerizable compounds, and
• B) compounds containing ethylenically unsaturated, free-radically polymerizable groups (polymerizable groups for short) and having a weight-average molecular weight Mw of less than 5000 g/mol,
  wherein at least 10% by weight of the compounds B are compounds B1 containing at least one nonaromatic ring system.

Claims

1. A mixture comprising

A) a polymer obtainable by polymerizing free-radically polymerizable compounds, and

B) compounds containing ethylenically unsaturated, free-radically polymerizable groups and having a weight-average molecular weight Mw of less than 5000 g/mol,

wherein at least 10% by weight of the compounds B are compounds B1 containing at least one nonaromatic ring system.

2. The mixture according to claim 1, wherein the polymer A is synthesized from at least 40% by weight of C1 C20 alkyl (meth)acrylates.

3. The mixture according to either of claims 1, wherein the polymer is crosslinkable by irradiation with high-energy light.

4. The mixture according to claim 1, wherein a photoinitiator is attached to the polymer.

5. The mixture according to claim 1, wherein the polymer has a K value of 10 to 100 measured in a 1% strength by weight solution of tetrahydrofuran, at 21°

C.

6. The mixture according to claim 1, wherein the polymer is a solution polymer.

7. The mixture according to claim 1, wherein the nonaromatic ring system of the compounds B1 is a cycloaliphatic ring system.

8. The mixture according to claim 1, wherein the nonaromatic ring system of the compounds B1 is an isocyanurate ring system.

9. The mixture according to claim 1, wherein at least 50% by weight of the compounds B are compounds B1.

10. The mixture according to claim 1, wherein compounds B1 consist of at least 10% by weight, based on the molar mass thereof, of carbon or nitrogen atoms which are part of a ring system.

11. The mixture according to claim 1, wherein the compounds B) comprise on average 1 to 5 polymerizable groups per molecule.

12. The mixture according to claim 1, wherein the polymerizable groups of the compounds B are acrylic or methacrylic groups.

13. The mixture according to claim 1, wherein the weight fraction of the compounds B) is 5% to 70% by weight, based on the sum by weight of A)+B).

14. The mixture according to claim 1, wherein the mixture comprises 0.0001 to 0.5 mol of a photoinitiator or of a photoinitiator group per 100 g of the sum by weight of polymer A) and compounds B).

15. The mixture according to claim 1, wherein the mixture comprises less than 5 parts by weight of water or solvent, based on 100 parts by weight of the sum by weight of A) and B).

16. A pressure-sensitive adhesive comprising the mixture according to claim 1.

17. A self-adhesive label, sheet or tape obtainable through use of the mixture according to claim 1 as a pressure-sensitive adhesive.

18. A method of producing a self-adhesive article, which comprises applying a mixture according to claim 1 to a backing and exposing it to high-energy radiation.