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US 8,912,289 B2Granted
Tapered asymmetric block copolymers and adhesives composition comprising the same
AssigneeKorea Kumho Petrochemical Co., Ltd.
InventorsJae Yun Kim, Min Sung Kwon, Eun Kyung Noh
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Abstract
Provided is a tapered block copolymer having asymmetric vinyl aromatic blocks. The disclosed tapered block copolymer has very superior adhesion properties such as loop tack, 180° peel strength and softening point and may be used to prepare high-quality hot melt adhesives for industrial use.
Claims16
A tapered block copolymer consisting of a compound represented by Chemical Formula 1:
- A1-(A2/B)-A3 (1)
- wherein A1 and A3 are vinyl aromatic block polymers;
- A2 is a vinyl aromatic monomer;
- B is a conjugated diene monomer;
- (A2/B) is a tapered block copolymer copolymerized from A2 and B;
- and the block size of A1 is different from that of A3, wherein a ratio of the block sizes of A3 and A1 is 1:1.1-8, and the block copolymer has a weight average molecular weight from 10,000 to 100,000.
3 more elements
A method for preparing a tapered block copolymer consisting of a compound represented by Chemical Formula 1, comprising:
- polymerizing a vinyl aromatic monomer (A1) in an inert organic solvent using a single organolithium initiator;
- upon completion of the polymerization, adding a conjugated diene monomer and a vinyl aromatic monomer (A2) together and performing polymerization;
- and
- adding a vinyl aromatic monomer (A3) and performing polymerization, and then deactivating the active terminals of polymers using a polymerization terminator:
- A1-(A2/B)-A3 (1)
- wherein A1 and A3 are vinyl aromatic block polymers;
- A2 is a vinyl aromatic monomer;
- B is a conjugated diene monomer;
- (A2/B) is a tapered block copolymer copolymerized from A2 and B;
- and the block size of A1 is different from the block size of A3, and wherein a ratio of the block sizes of A3 and A1 is 1:1.1-8, and the block copolymer has a weight average molecular weight from 10,000 to 100,000.
7 more elements
Dependencies are inferred from the claim text.