ADHESIVE INCLUDING PENDANT (METH)ACRYLOYL GROUPS, ARTICLE, AND METHOD

• US 20160289513A1
• Filed: 11/04/2013
• Published: 10/06/2016
• Est. Priority Date: 11/16/2012
• Status: Active Application

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Behling, Ross E., Everaerts, Albert I.
• Granted Patent: US 10,287,463 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B05D 3/06 by exposure to radiation B05D3/02 takes precedence ; plasma treatment B05D3/141
• CPC Class Codes: C09J 133/066 containing -OH groups
• 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
• CPC Class Codes: C09J 133/14 of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
• CPC Class Codes: C09J 133/26 Homopolymers or copolymers of acrylamide or methacrylamide
• CPC Class Codes: C09J 201/02 characterised by the presence of specified groups , e.g. terminal or pendant functional groups
• CPC Class Codes: C09J 2301/30 characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
• CPC Class Codes: C09J 2433/00 Presence of (meth)acrylic polymer
• CPC Class Codes: C09J 7/40 characterised by release liners

Abstract

An adhesive including a (meth)acrylate copolymer having pendant (meth)acryloyl groups, wherein the (meth)acrylate copolymer has a weight average molecular weight of 50,000 Daltons to 600,000 Daltons and an average molecular weight between (meth)acryloyl groups equal to at least 6,000 Daltons.

Claims

1. An adhesive comprising a (meth)acrylate copolymer having pendant (meth)acryloyl groups and optional pendant hydroxyl groups, wherein the (meth)acrylate copolymer has a weight average molecular weight of 50,000 Daltons to 600,000 Daltons and an average molecular weight between (meth)acryloyl groups equal to at least 6,000 Daltons.

2. The adhesive of claim 1 wherein the (meth)acrylate copolymer is at least partially cured.

3. The adhesive of claim 2 which is optically clear.

4. The adhesive of claim 2 which has a tan δ

of at least 0.5, as measured at a temperature of 60°

C. and an angular frequency of 1 Radian/second.

5. (canceled)

6. (canceled)

7. An article comprising a substrate and an adhesive layer adjacent to the substrate, the adhesive layer comprising a (meth)acrylate copolymer having pendant (meth)acryloyl groups and optional pendant hydroxyl groups, wherein the (meth)acrylate copolymer has a weight average molecular weight of 50,000 Daltons to 600,000 Daltons and an average molecular weight between (meth)acryloyl groups equal to at least 6,000 Daltons.

8. The article of claim 7 wherein the (meth)acrylate copolymer is at least partially cured.

9. The article of claim 7 wherein the (meth)acrylate copolymer having pendant (meth)acryloyl groups and optionally pendant hydroxyl groups is prepared from monomers comprising one or more (meth)acrylic ester monomers and one or more copolymerizable polar monomers.

10. The article of claim 7 wherein the adhesive layer further comprises a free radical initiator.

11. The article of claim 8 wherein the (meth)acrylate copolymer is fully cured.

12. The article of claim 8 wherein the (meth)acrylate copolymer is partially cured and has a tan δ

of at least 0.5, as measured at a temperature of 60°

C. and with an angular frequency of 1 Radian/second.

13. A method of preparing an adhesive article, the method comprising:

providing a substrate;

applying an adhesive layer adjacent to the substrate, the adhesive layer comprising a (meth)acrylate copolymer having pendant (meth)acryloyl groups and optionally pendant hydroxyl groups, wherein the (meth)acrylate copolymer has a weight average molecular weight of 50,000 to 600,000 Daltons and an average molecular weight between (meth)acryloyl groups equal to at least 6,000 Daltons;

optionally exposing the adhesive layer to an energy source to form an at least partially cured copolymer, wherein after partially curing, the adhesive layer has a tan delta (δ

) of at least 0.5, as measured at 60°

C. and an angular frequency of 1 Radian/second.

14. The method of claim 13 further comprising:

applying a second substrate adjacent to the adhesive layer such that it is positioned between two substrates; and

exposing the adhesive layer to an energy source to cure the (meth)acrylate copolymer and reduce the tan delta of the adhesive, as measured at 60°

C. and with an angular frequency of 1 Radian/second, to a value below that of the adhesive prior to this exposing step.

15. (canceled)