Thermoset pressure-sensitive adhesive

Patent metadata

Field	Value
Publication number	US-10077384-B2
Application number	US-201515122189-A
Country	US
Kind code	B2
Filing date	Mar 4, 2015
Priority date	Mar 7, 2014
Publication date	Sep 18, 2018
Grant date	Sep 18, 2018

Abstract

A thermoset pressure-sensitive adhesive containing a tacky polymer, polyvinyl acetal, an epoxy resin, and an epoxy resin curing agent. The tacky polymer is obtained by copolymerizing a first monomer constituted by at least one type of (meth)acrylate ester of a non-tertiary non-cyclic alcohol having 8 to 12 carbon atoms and including one (meth)acryloyl group, a second monomer comprising a nitrogen atom and an ethylenically unsaturated group, and more than 0 parts by mass to no more than about 0.5 parts by mass of a crosslinking agent per a total of 100 parts by mass of the first monomer and the second monomer.

First claim

What is claimed is:

1. A thermoset pressure-sensitive adhesive comprising a tacky polymer, polyvinyl acetal, an epoxy resin, and an epoxy resin curing agent;
the tacky polymer being obtained by copolymerizing:
a first monomer comprising at least one (meth)acrylate ester of a non-tertiary non-cyclic alcohol having 8 to 12 carbon atoms and having one (meth)acryloyl group;
a second monomer comprising a nitrogen atom and an ethylenically unsaturated group; and
more than 0 parts by mass to no more than about 0.5 parts by mass of a crosslinking agent per a total of 100 parts by mass of the first monomer and the second monomer.

2. The thermoset pressure-sensitive adhesive according to claim 1 , wherein the adhesive exhibits an increase in area of about 320% or less when formed into a 0.6 mm-thick sheet and left standing for 25 minutes in a 120° C. atmosphere under a pressure of 2.5 kg/cm 2 .

3. The thermoset pressure-sensitive adhesive according to claim 1 , wherein a content amount of the polyvinyl acetal is in the range of from about 5 up to about 20 parts by mass per a total of 100 parts by mass of the first monomer and the second monomer.

4. The thermoset pressure-sensitive adhesive according to claim 1 , wherein the first monomer comprises as an essential component a (meth)acrylate ester of a non-tertiary non-cyclic alcohol having 8 carbon atoms and having one (meth)acryloyl group.

5. The thermoset pressure-sensitive adhesive according to claim 2 , wherein a content amount of the polyvinyl acetal is in the range of from about 5 up to about 20 parts by mass per a total of 100 parts by mass of the first monomer and the second monomer.

6. The thermoset pressure-sensitive adhesive according to claim 2 , wherein the first monomer comprises as an essential component a (meth)acrylate ester of a non-tertiary non-cyclic alcohol having 8 carbon atoms and having one (meth)acryloyl group.

7. The thermoset pressure-sensitive adhesive according to claim 3 , wherein the first monomer comprises as an essential component a (meth)acrylate ester of a non-tertiary non-cyclic alcohol having 8 carbon atoms and having one (meth)acryloyl group.

8. The thermoset pressure-sensitive adhesive according to claim 4 , wherein the first monomer comprises as an essential component a (meth)acrylate ester of a non-tertiary non-cyclic alcohol having 8 carbon atoms and having one (meth)acryloyl group.

9. A method comprising:
bonding together two surfaces using the thermoset pressure-sensitive adhesive of claim 1 .

10. A method comprising:
bonding together two surfaces using the thermoset pressure-sensitive adhesive of claim 2 .

11. A method comprising:
bonding together two surfaces using the thermoset pressure-sensitive adhesive of claim 3 .

12. A method comprising:
bonding together two surfaces using the thermoset pressure-sensitive adhesive of claim 4 .

13. A method comprising:
bonding together two surfaces using the thermoset pressure-sensitive adhesive of claim 5 .

14. A method comprising:
bonding together two surfaces using the thermoset pressure-sensitive adhesive of claim 6 .

15. A method comprising:
bonding together two surfaces using the thermoset pressure-sensitive adhesive of claim 7 .

16. A method comprising:
bonding together two surfaces using the thermoset pressure-sensitive adhesive of claim 8 .

17. A joint formed by two substrates bonded together using the thermoset pressure-sensitive adhesive according to claim 1 .

18. A joint formed by two substrates bonded together using the thermoset pressure-sensitive adhesive according to claim 2 .

19. A joint formed by two substrates bonded together using the thermoset pressure-sensitive adhesive according to claim 3 .

20. A joint formed by two substrates bonded together using the thermoset pressure-sensitive adhesive according to claim 4 .

Assignees

• 3M Innovative Properties Co

Inventors

• Shinozaki Kotaro

Classifications

• C08L33/10

  Homopolymers or copolymers of methacrylic acid esters · CPC title

• C09J129/04

  Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids · CPC title

• C08L29/04

  Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids · CPC title

• C09J2463/00

  Presence of epoxy resin · CPC title

• C08F222/10

  Esters · CPC title