PRESSURE-SENSITIVE ADHESIVES WITH MIXED PHOTOCROSSLINKING SYSTEM

• US 20150152298A1
• Filed: 02/11/2015
• Published: 06/04/2015
• Est. Priority Date: 04/26/2011
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Krepski, Larry R., Gaddam, Babu N., Aloshyna ep Lesuffleur, Marie, Weikel, Arlin L., Shafer, Kathleen S.
• Granted Patent: US 9,243,172 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C08K 5/07 Aldehydes; Ketones
• CPC Class Codes: C08K 5/08 Quinones
• CPC Class Codes: C08K 5/45 Heterocyclic compounds having sulfur in the ring
• CPC Class Codes: C08L 2312/06 by radiation
• CPC Class Codes: C09J 133/06 of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
• CPC Class Codes: C09J 133/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C09J 133/10 Homopolymers or copolymers of methacrylic acid esters

Abstract

The present disclosure provides a method of providing an adhesive composition comprising the steps of combining crosslinkable composition including: a) a (meth)acryloyl monomer mixture with the b) photocrosslinking agent mixture, and irradiating with UVC radiation to polymerize and crosslink the composition.

Claims

1. A crosslinkable syrup composition comprising:

a) solute copolymer comprising interpolymerized monomer units of;

i) a (meth)acrylic acid ester monomer;

ii) an acid-functional ethylenically unsaturated monomer;

iii) an optional non-acid-functional polar monomer;

iv) an optional vinyl monomer;

b) a photocrosslinking agent mixture comprising a benzophenone photocrosslinker, and an anthraquinone photocrosslinker and/or a thioxanthone photocrosslinker; and

c) a component including at least one free-radically polymerizable solvent monomer.

2. The crosslinkable syrup composition of claim 1 wherein the photocrosslinking mixture comprises5 to 50 wt. % benzophenone photocrosslinker, and50 to 95 wt. % of either an anthraquinone photocrosslinker or a thioxanthone photocrosslinkers.

3. The crosslinkable syrup composition of claim 1 wherein the photocrosslinking mixture comprises20 to 50 wt. % benzophenone photocrosslinker, and50 to 80 wt. % of either an anthraquinone photocrosslinker or a thioxanthone photocrosslinkers.

4. The crosslinkable syrup composition of claim 1 where the photocrosslinking mixture comprises 0.01 to 10 wt. % relative to the (meth)acryloyl monomer mixture.

5. The crosslinkable syrup composition of claim 1 where the photocrosslinking mixture comprises 0.1 to 5 wt. % relative to the (meth)acryloyl monomer mixture.

6. The crosslinkable syrup composition of claim 1 wherein the photocrosslinking mixture comprises a benzophenone photocrosslinker, and an anthraquinone photocrosslinker.

7. The crosslinkable syrup composition of claim 1 wherein the photocrosslinking mixture comprises a benzophenone photocrosslinker and a thioxanthone photocrosslinker.

8. The crosslinkable syrup composition of claim 1 wherein the photocrosslinking mixture comprises a benzophenone photocrosslinker, a thioxanthone photocrosslinker, and an anthraquinone photocrosslinker.

9. The crosslinkable syrup composition of claim 1 wherein the a (meth)acryloyl monomer mixture comprises:

i. 85 to 99.5 parts by weight of an (meth)acrylic acid ester of non-tertiary alcohol;

ii. 0.5 to 15 parts by weight of an acid functional ethylenically unsaturated monomer;

iii. 0 to 10 parts by weight of a non-acid functional, ethylenically unsaturated polar monomer;

iv. 0 to 5 parts vinyl monomer; and

v. 0 to 5 parts of a multifunctional (meth)acrylate;

based on 100 parts by weight total monomer.

10. The crosslinkable syrup composition of claim 1 wherein the (meth)acryloyl comonomer mixture comprises 0.01 to 5 parts of the multifunctional (meth)acrylate, based on 100 parts total monomers.

11. The crosslinkable syrup polymer composition of claim 10 further comprising a chain transfer agent.

12. An adhesive composition comprising a (meth)acryloyl copolymer comprising:

a) an acid-functional (meth)acryloyl copolymer of interpolymerized monomers that include;

i) a (meth)acrylic acid ester;

ii) an acid-functional ethylenically unsaturated monomer;

iii) an optional non-acid-functional polar monomer;

iv) an optional vinyl monomer; and

v) an optional multifunctional (meth)acrylate crosslinker, and

b) the residues of a benzophenone photocrosslinker, and an anthraquinone photocrosslinker and/or a thioxanthone photocrosslinker in the copolymer matrix.