Adhesive and polymer for adhesives

• US 6,274,666 B1
• Filed: 08/11/1994
• Issued: 08/14/2001
• Est. Priority Date: 08/11/1994
• Status: Expired due to Term

• Current Assignee: Firestone Polymers, LLC (Bridgestone Corporation)
• Original Assignee: Bridgestone Firestone North American Tire LLC (Bridgestone Corporation)
• Inventors: Dougherty, David J.
• Primary Examiner(s): SZEKELY, PETER A
• Application Number:
  US08/288,861
• Time in Patent Office: 2,560 Days
• Field of Search: 524/271, 524/274, 524/505, 524/485, 525/98, 525/314
• US Class Current: 524/505
• CPC Class Codes: C08F 297/04 polymerising vinyl aromatic monomers and conjugated dienes
• CPC Class Codes: C08F 8/04 Reduction, e.g. hydrogenation
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 2666/28 Non-macromolecular organic substances
• CPC Class Codes: C09J 153/02 Vinyl aromatic monomers and conjugated dienes

Abstract

It has been discovered that block copolymers comprising at least two polymer blocks containing a vinyl aromatic hydrocarbon monomer contributed units and at least one polymer block conjugated diene monomer contributed units exhibit desirable adhesive properties. The vinyl aromatic hydrocarbon content [S] of the instant block copolymers is 25% to 60% by weight and the vinyl content of the conjugated diene portion [V] is 30% to 70%. The relationship between the vinyl aromatic hydrocarbon content [S] and the vinyl content of the conjugated diene portion [V] satisfies the formula:

75≦[S]+[V]≦100.

According to the instant invention, adhesive compositions may be prepared which contain about 10% to about 50% of the block copolymers, about 20% to about 80% of a compatible tackifying resin; about 10% to about 40% of a platicizing oil; about 0.2% to about 2.5% of various stabilizers and 0% to about 10% of a compatible wax.

Claims

1. An adhesive composition comprising:

(a) 10% to 50% of a linear block copolymer, wherein said block copolymer comprises at least two polymer blocks comprising a vinyl aromatic hydrocarbon and at least one polymer block comprising a conjugated diene, and comprises;

(i) a vinyl aromatic hydrocarbon content [S] of 40 to 50% by weight;

(ii) a vinyl content of the conjugated diene portion [V] of 30% to 70%; and

(iii) the relationship between said vinyl aromatic hydrocarbon content [S] and said 1,2-vinyl content of the conjugated diene portion [V] satisfies the formula;

2. The adhesive composition according to claim 1 wherein said vinyl aromatic hydrocarbon is styrene.

3. The adhesive composition according to claim 1 wherein the vinyl content of the conjugated diene portion [V] is 40 to 50%.

4. The adhesive composition according to claim 1 wherein the relationship between said vinyl aromatic hydrocarbon content [S] and said vinyl content of the conjugated diene portion [V] satisfies the formula:

5. The adhesive composition according to claim 1 wherein said conjugated diene comprises butadiene.

6. The adhesive composition according to claim 1 wherein said resin is a modified terpene resin.

7. The adhesive composition according to claim 1 wherein said oil is a naphthenic oil.

8. The adhesive composition according to claim 1, wherein the block copolymer is branched.

16. The adhesive composition of claim 1, wherein the vinyl content of the conjugated diene portion [V] is between 40 and 60% by weight.

9. An adhesive composition comprising:

(a) 10% to 50% of a block linear copolymer, wherein said block copolymer comprises at least two polymer blocks comprising a vinyl aromatic hydrocarbon and at least one polymer block comprising a conjugated diene, and comprises;

(i) a vinyl aromatic hydrocarbon content [S] of 40% to 60% by weight;

(ii) a vinyl content of the conjugated diene portion [V] of 30% to 70%; and

(iii) the relationship between said vinyl aromatic hydrocarbon content [S] and said 1,2-vinyl content of the conjugated diene portion [V] satisfies the formula;

10. The adhesive composition according to claim 9 wherein said vinyl aromatic hydrocarbon is styrene.

11. The adhesive composition according to claim 9 wherein the vinyl aromatic hydrocarbon content [S] is 40 to 50% by weight and the vinyl content of the conjugated diene portion [V] is 40 to 50%.

12. The adhesive composition according to claim 9 wherein the relationship between said vinyl aromatic hydrocarbon content [S] and said vinyl content of the conjugated diene portion [V] satisfies the formula:

13. The adhesive composition according to claim 9 wherein said conjugated diene comprises butadiene.

14. The adhesive composition according to claim 9 wherein said resin is a modified terpene resin.

15. The adhesive composition according to claim 9 wherein said oil is a naphthenic oil.

17. The adhesive composition of claim 9, wherein the vinyl content of the conjugated diene portion is between 40 and 60% by weight.

18. The adhesive composition of claim 9 wherein said linear block copolymer includes two conjugated diene end blocks.

19. The adhesive composition of claim 9 wherein the vinyl aromatic hydrocarbon content (S) is between 42% to 60% by weight.