Structural acrylic adhesive

Patent metadata

Field	Value
Publication number	US-9416299-B2
Application number	US-201314379322-A
Country	US
Kind code	B2
Filing date	Feb 20, 2013
Priority date	Feb 23, 2012
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

There is provided an adhesive composition comprising: a) at least one acrylic functional monomer; b) a first toughening agent; c) a second toughening agent; d) an adhesion promoter; and e) a high aspect ratio filler selected from at least one of a high aspect ratio fibrillated filler and a halloycite clay filler.

First claim

What is claimed is:

1. An adhesive composition comprising:
a) at least one acrylic functional monomer;
b) a first toughening agent selected from at least one of a block copolymer, a core-shell particle, and combinations thereof;
c) a second toughening agent, wherein the second toughening agent is a methacrylate terminated liquid rubber;
d) an adhesion promoter; and
e) a high aspect ratio filler selected from at least one of a high aspect ratio fibrillated filler and a halloycite clay filler.

2. The adhesive composition of claim 1 wherein the high aspect ratio filler is surface treated to improve miscibility with resins.

3. The adhesive composition of claim 1 further comprising fumed silica.

4. The adhesive composition of claim 1 wherein the block copolymer is selected from a polystyrene-b-butadiene-b-(methyl methacrylate) block copolymer or a poly(methyl methacrylate)-b-poly(n-butyl acrylate)-b-poly(methyl methacrylate) block copolymer.

5. The adhesive composition of claim 1 wherein the adhesion promoter is an acidic adhesion promoter.

6. The adhesive composition of claim 1 wherein the high aspect ratio fibrillated filler is micro-fibrillated.

7. The adhesive composition of claim 3 wherein the composition has a peel value of greater than 3.5 kN/m.

8. The adhesive composition of claim 3 wherein the composition has a peel value of greater than 4.4 kN/m.

9. The adhesive composition of claim 1 having substantially cohesive failure.

10. The adhesive composition of claim 1 further comprising a cure initiator system.

11. The adhesive composition of claim 10 wherein the cure initiator system comprises a barbituric acid derivative and a metal salt.

12. The adhesive composition of claim 11 wherein the cure initiator system further comprises an organic peroxide, ammonium chloride salt, or a mixture thereof.

Assignees

• 3M Innovative Properties Co

Inventors

• Kropp Michael A
• Thompson Zachary J

Classifications

• C09J4/00 Primary

  Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond {; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16} · CPC title

• C08F287/00

  Macromolecular compounds obtained by polymerising monomers on to block polymers · CPC title

• C09J153/00

  Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers · CPC title

• C08F220/18

  with acrylic or methacrylic acids · CPC title