Adhesive compositions
AssigneeAsahi Kasei Kogyo Kabushiki Kaisha
InventorsToshinori Shiraki, Yasuo Hattori, Masao Karouji
Life of this patent
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Abstract
An adhesive composition comprising 100 parts by weight of a block copolymer (a) containing of at least one polymer block composed mainly ofa vinyl aromatic hydrocarbon and at least one polymer block composed mainly of butadiene in which (i) the vinyl aromatic hydrocarbon content [S] is 10 to 30% by weight, (ii) the 1,2-vinyl content of butadiene portion [V] is 20 to 50%, and (iii) the relationship between said vinyl aromatic hydrocarbon content [S] and said 1,2-vinyl content of butadiene portion [V] satisfies the formula,: 40.ltoreq.[S]+[V].ltoreq.70 40 to 200 parts by weight of a tackifier (b), and, optionally various stabilizers, and a process for producing said composition.
Claims22
An adhesive composition comprising 100 parts by weight of a block copolymer (a) consisting of at least one polymer block composed mainly of a vinyl aromatic hydrocarbon and at least one polymer block composed mainly of butadiene in which
- (i) the vinyl aromatic hydrocarbon content [S] is 10 to 30% by weight,
- (ii) the 1,2-vinyl content of butadiene portion [V] is 20 to 50%, and
- (iii) the relationship between said vinyl aromatic hydrocarbon content [S] and said 1,2-vinyl content of butadiene portion [V] satisfies the formula:
- 40.ltoreq.[S]+[V].ltoreq.70
- and 40 to 200 parts by weight of a tackifier (b).
A process for producing an adhesive composition which comprises blending 100 parts by weight of a block copolymer (a) consisting of at least one polymer block composed mainly of a vinyl aromatic hydrocarbon and at least one polymer block composed mainly of butadiene in which
- (i) the vinyl aromatic hydrocarbon content (S) is 10 to 30% by weight,
- (ii) the 1,2-vinyl contnt of butadiene portion (V) is 20 to 50%, and
- (iii) the relationship between said vinyl aromatic hydrocarbon content (S) and said 1,2-vinyl content of butadiene portion (V) satisfying the formula:
- 4.ltoreq. (S)+(V).ltoreq.70
- with 40 to 200 parts by weight of a tackifier (b).
Dependencies are inferred from the claim text.