Block copolymer composition and hot-melt adhesive composition
AssigneeZeon Corporation
InventorsRyouji Oda, Sadaharu Hashimoto, Ayako Furuko
Life of this patent
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Abstract
Provided is a hot-melt adhesive composition which can be easily applied at a relatively low temperature, has a long open time, and also has high holding power. A hot-melt adhesive composition comprising a block copolymer composition which includes a block copolymer A and a block copolymer B, and a tackifying resin, wherein a weight ratio (A/B) of the block copolymer A and the block copolymer B is 25/75 to 90/10, and an aromatic vinyl monomer unit content of the block copolymer A is 41% or greater.
Claims5
-4. (canceled)
A hot-melt adhesive composition comprising a block copolymer composition which includes a block copolymer A represented by the following general formula (A) and a block copolymer B represented by the following general formula (B), and a tackifying resin,
- wherein a weight ratio (A/B) of the block copolymer A and the block copolymer B in the block copolymer composition is 25/75 to 90/10, and an aromatic vinyl monomer unit content of the block copolymer A is 41% or greater:
- Ar1a-Da-Ar2a (A)
- (Arb-Db)n-X (B),
- in the general formulas (A) and (B), Ar1a and Arb each represent an aromatic vinyl polymer block having a weight average molecular weight of 6,000 to 15,000;
- Ar2a represents an aromatic vinyl polymer block having a weight average molecular weight of 40,000 to 400,000;
- Da and Db each represent a conjugated diene polymer block having a vinyl bond content of 1 mol % to 20 mol %;
- X represents a single bond, or a residue of a coupling agent;
- and n represents an integer of 2 or greater.
A block copolymer composition comprising a block copolymer P represented by the following general formula (P), a block copolymer Q represented by the following general formula (O), and a block copolymer R represented by the following general formula (R), wherein a weight ratio (P/Q) of the block copolymer P and the block copolymer Q is 25/75 to 90/10, a weight ratio (R/(P+Q)) of the block copolymer R and a total weight of the block copolymer P and the block copolymer Q is 10/90 to 70/30, an aromatic vinyl monomer unit content of the block copolymer P is 41% by weight or greater, and a content of an aromatic vinyl monomer unit relative to all polymer components in the block copolymer composition is 15% to 80% by weight:
- Ar1p-Dp-Ar2p (P)
- (Arq-Dq)m-Xq (Q)
- Arr-Dr (R),
- in the general formulas (P), (Q) and (R), Ar1p, Arq and Arr each represent an aromatic vinyl polymer block having a weight average molecular weight of 6,000 to 20,000;
- Ar2p represents an aromatic vinyl polymer block having a weight average molecular weight of 40,000 to 400,000;
- Dp, Dq and Dr each represent a conjugated diene polymer block having a vinyl bond content of 1 mol % to 20 mol %;
- Xq represents a single bond, or a residue of a coupling agent;
- and m represents an integer of 2 or greater.
Dependencies are inferred from the claim text.