Ultrafast heat/room temperature adhesive composition for bonding applications

1. A two-part curable composition comprising:

a. A first part comprising:

i. at least one (meth)acrylate monomer in an amount within the range of 20 to 60 weight %;

ii. a first halogen-free elastomer in an amount within the range of about 10 to about 50 weight % comprising a styrene-butadiene-styrene block copolymer having a styrene content of about 37% to about 43% by weight of the copolymer;

iii. an acid catalyst;

iv. a free radical initiator; and

v. a free radical stabilizer; and

b. A second part comprising:

i. at least one (meth)acrylate monomer in an amount with in the range of about 30 to about 70 weight %;

ii. a second halogen-free elastomer in an amount within the range of about 10 to 40 weight %;

iii. a catalyst; and

iv. a stabilizer or stabilizing said catalyst;

wherein when said first part and said second part are combined together a curable composition is formed.

2. The composition of claim 1 , wherein said at least one (meth)acrylate monomer comprises at least one monomer selected from the group consisting of methyl methacrylate, butyl methacrylate, isobornyl acrylate, dibutylene dimethacrylate, tri-propanol trimethacrylate, and combinations thereof.

3. The composition of claim 1 , wherein said acid catalyst comprises a component selected from the group consisting of acrylic acid, methacrylic acid, and combinations thereof.

4. The composition of claim 1 , wherein said free radical initiator comprises at least one component selected from the group consisting of T-butyl peroxide, T-butyl perbenzoate, cyclohexanone peroxide, and combinations thereof.

5. The composition of claim 1 , wherein said free radical stabilizer comprises at least one component selected from the group consisting of hydroquinones, butylated hydroxytoluene, and phosphonates.

6. The composition of claim 1 , wherein said catalyst comprises at least one component selected from the group consisting of amine catalysts, metal catalysts, and combinations thereof.

7. The composition of claim 1 , wherein said stabilizer for stabilizing said catalyst comprises triphenyl phosphine.

8. The composition of claim 1 , wherein said curable composition is capable of curing at room temperature in about 10 to about 60 minutes.

9. The composition of claim 1 , wherein said curable composition is capable of curing at temperatures of about 60° C. to about 90° C. in about 10 to about 30 minutes.

10. The composition of claim 1 , wherein said curable composition is capable of withstanding temperature as low as −50° C. once cured.

11. The composition of claim 1 , wherein said curable composition provides impact strength of at least 10 joules as measured by a 15 kg drop test at 1 meter once cured.

12. A two-part curable composition comprising:

a. A first part comprising:

i. at least one (meth)acrylate monomer in an amount within the range of 20 to 60 weight %;

ii. a first halogen-free elastomer in an amount within the range of about 10 to about 50 weight % comprising a styrene-butadiene-styrene block copolymer, wherein said styrene-butadiene-styrene block copolymer has a styrene content of about 40% by weight of said copolymer;

iii. an acid catalyst;

iv. a free radical initiator; and

iv. a free radical stabilizer; and

b. A second part comprising;

i. at least one (meth)acrylate monomer in an amount within the range or about 30 to about 70 weight %;

ii. a second halogen-free elastomer in an amount within the range of about 10 to about 40 weight % comprising a styrene-butadiene-styrene block copolymer;

iii. an amine accelerator;

iv. a metal catalyst; and

v. triphenyl phosphine;

wherein when said first part and said second part are combined together a curable composition is formed.

13. A method of adhering components of an electronic device, comprising the steps of:

a. providing a first part comprising:

i. at least one (meth)acrylate monomer in an amount within the range of 20 to 60 weight %;

ii. a first halogen-free elastomer in an amount within the range of about 10 to about 50 weight % comprising a styrene-butadiene-styrene block copolymer having a styrene content of about 37% to about 43% by weight of said copolymer;

iii. an acid catalyst;

iv. a free radical initiator; and

v. a free radical stabilizer;

b. providing a second part comprising:

i. at least one (meth)acrylate monomer in an amount within the range of about 30 to about 70 weight %;

ii. a second halogen-free elastomer in an amount within the range of about 10 to about 40 weight comprising a styrene-butadiene-styrene block copolymer;

iii. an amine accelerator;

iv. a metal catalyst; and

v. triphenyl phosphine;

c. mixing said first part and said second part to form a curable composition; and

d. applying said curable composition to at least one component of an electronic device.

14. The method of claim 13 , wherein said first part and said second part are mixed together in a weight ratio of about 2:1 of first part to second part.

15. A method of preparing a two-part curable composition, comprising the steps of:

a. providing a first set of components comprising:

i. at least one (meth)acrylate monomer in an amount within the range of 20 to 60 weight %;

ii. a first halogen-free elastomer in an amount within the range of about 10 to about 30 weight % comprising a styrene-butadiene-styrene block copolymer having a styrene content of about 37% to about 43% by weight of said copolymer;

iii. an acid catalyst;

iv. a free radical initiator; and

v. a free radical stabilizer;

b. mixing said first set of components to form a first part;

c. providing a second set of components comprising;

i. at least one (meth)acrylate monomer in an amount within the range of about 30 to about 70 weight %;

ii. a second halogen-free elastomer in an amount within the range of about 10 to about 40 weight % comprising a styrene-butadiene-styrene block copolymer;

iii. an amine accelerator;

iv. a metal catalyst; and

v. triphenyl phosphine; and

d. mixing said second set of components to form a second part.