Asphalt modifier composition and asphalt composition comprising the same

Patent metadata

Field	Value
Publication number	US-9328235-B2
Application number	US-93650209-A
Country	US
Kind code	B2
Filing date	May 20, 2009
Priority date	Jul 21, 2008
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

Disclosed are block copolymer formed by block-copolymerizing vinyl aromatic hydrocarbon and conjugated diene compound and asphalt modifier composition including specific functional additives. Asphalt modifier composition according to the present invention is rapidly dissolved in asphalt without substantially lowering a softening point of asphalt, making it possible to form uniform asphalt composition and improve the productivity of the asphalt composition.

First claim

What is claimed is:

1. An asphalt modifier composition, comprising:
a block copolymer, which is formed by block-copolymerizing a vinyl aromatic hydrocarbon and a conjugated diene compound; and
di(2-ethylhexyl)adipate as a functional additive,
wherein the block copolymer is an amount of 90 to 99.9 wt % and the function additive is an amount of 0.1 to 10 wt %, and
wherein the weight ratio of the vinyl aromatic block to the conjugated diene block is in the range of 5:95 to 50:50.

2. The asphalt modifier composition according to claim 1 , wherein the block copolymer includes the vinyl aromatic block having molecular weight of 5,000 to 150,000 g/mol and the conjugated diene block having molecular weight of 8,000 to 150,000 g/mol.

3. The asphalt modifier composition according to claim 1 , wherein the vinyl aromatic block of the block copolymer is formed by one or more compound selected from a group consisting of styrene, methylstyrene, and a mixture thereof, and the conjugated diene block of the block copolymer is formed by one or more compound selected from a group consisting of butadiene, isoprene, and a mixture thereof.

4. The asphalt modifier composition according to claim 1 , wherein the block copolymer is triblock copolymer in which the conjugated diene block is formed between the vinyl aromatic blocks.

5. The asphalt modifier composition according to claim 4 , wherein the triblock copolymer has a linear form that the vinyl aromatic block, the conjugated diene block, and the vinyl aromatic block are connected in order.

6. The asphalt modifier composition according to claim 4 , wherein the triblock copolymer is a star shape of Si (-conjugated diene block, -vinyl aromatic block) 4 .

7. The asphalt modifier composition according to claim 4 , wherein the molecular weight of the triblock copolymer is in the range of 15,000 to 500,000 g/mol.

8. An asphalt composition comprising the asphalt modifier composition according to claim 1 and asphalt.

9. The asphalt modifier composition according to claim 8 , wherein the mixing ratio of the asphalt modifier composition and the asphalt is 1:99 to 15:85 based on weight.

10. A method for preparing an asphalt modifier composition, comprising:
preparing a block copolymer by block-copolymerizing a vinyl aromatic hydrocarbon and a conjugated diene compound by anionic polymerization using organic anionic initiator in a reactor containing a hydrocarbon solvent;
injecting di(2-ethylhexyl) adipate as a functional additive into the reactor; and
obtaining the asphalt modifier composition including 90 to 99.9 wt % of the block copolymer and 0.1 to 10 wt % of the functional additive by removing the hydrocarbon solvent.

11. The method for preparing the asphalt modifier composition according to claim 10 , wherein the step of preparing the block copolymer comprises:
forming the vinyl aromatic block by adding the vinyl aromatic hydrocarbon in the reactor including the hydrocarbon solvent and followed by injecting the organic anionic initiator therein;
forming the conjugated diene block connected to a terminal of the vinyl aromatic block by adding the conjugated diene compound in the reactor; and
forming the vinyl aromatic block connected to the terminal of the conjugated diene block formed by adding the vinyl aromatic hydrocarbon in the reactor or forming linear triblock copolymer by injecting coupling agent in the reactor.

12. The method for preparing the asphalt modifier composition according to claim 10 , wherein the step of preparing the block copolymer comprises:
forming the vinyl aromatic block by adding the vinyl aromatic hydrocarbon in the reactor including the hydrocarbon solvent and followed by injecting the organic anionic initiator therein;
forming the conjugated diene block connected to a terminal of the vinyl aromatic block by adding the conjugated diene compound in the reactor; and
forming a star-shaped triblock copolymer by injecting a coupling agent in the reactor.

Assignees

• Chun Moon Seok
• Ryu Jin Young
• Choi Ik Jun
• Lg Chemical Ltd

Inventors

• Chun Moon Seok
• Ryu Jin Young
• Choi Ik Jun

Classifications

• C08L53/02 Primary

  of vinyl-aromatic monomers and conjugated dienes · CPC title

• C08K5/11 Primary

  of acyclic polycarboxylic acids · CPC title

• C08L2666/24

  Graft or block copolymers according to groups C08L51/00, C08L53/00 or C08L55/02; Derivatives thereof · CPC title

• C08L95/00

  Compositions of bituminous materials, e.g. asphalt, tar, pitch · CPC title

• C08L2666/06

  Homopolymers or copolymers of unsaturated hydrocarbons; Derivatives thereof · CPC title