A film, sheet, or tube having an excellent low-temperature shrinkage suitable for use as, for example, a heat shrinkable label is disclosed. This film, sheet, or tube contains, as a base polymer, a block copolymer of an aromatic vinyl hydrocarbon polymer block and a polymer block composed mainly of
A film, sheet, or tube having an excellent low-temperature shrinkage suitable for use as, for example, a heat shrinkable label is disclosed. This film, sheet, or tube contains, as a base polymer, a block copolymer of an aromatic vinyl hydrocarbon polymer block and a polymer block composed mainly of a conjugated diene having the following structure: ________________________________ -(a) (AB)n n =2-10 (b) A(BA)n n =2-10 (c) B(AB)n n =2-10 (d) [(BA)n]m+2X n =2-10 and m =1-10 (e) [(AB)n]m+2X n =2-10 and m =1-10 (f) [(BA)nB]m+2X n =1-10 and m =1-10, or (g) [(AB)nA]m+2X n =1-10 and m =1-10 ________________________________ wherein A is an aromatic vinyl hydrocarbon polymer block having a number-average molecular weight of 10,000 through 70,000, B is a polymer block composed mainly of a conjugated diene, and X is a residual group of a coupling agent or a polyfunctional initiator such as an organo polylithium compound, the weight ratio of the aromatic vinyl hydrocarbon to the conjugated diene being 60:40 through 95:5.
대표청구항▼
An oriented film, sheet, or tube of a block copolymer having an excellent low-temperature shrinkage of not less than 15% in terms of a heat shrinkage factor at 80°C. in at least one direction, comprising, as a base polymer, a block copolymer or any mixture thereof (component (A)), said block copolym
An oriented film, sheet, or tube of a block copolymer having an excellent low-temperature shrinkage of not less than 15% in terms of a heat shrinkage factor at 80°C. in at least one direction, comprising, as a base polymer, a block copolymer or any mixture thereof (component (A)), said block copolymer having a melt flow of 0.001 through 70 g/10 min and having the following structure: ________________________________ -(a) (A B)n n =2-10 (b) A(B A)n n =2-10 (c) B(A B)n n =2-10 (d) [(B A)n]m+2X n =2-10 and m =1-10 (e) [(A B)n]m+2X n =2-10 and m =1-10 (f) [(B A)n]Bm+2X n =1-10 and m =1-10, or (g) [(A B)n]Am+2X n =1-10 and m =1-10 ________________________________ wherein A is an aromatic vinyl hydrocarbon polymer block having a number-average molecular weight of 10,000 through 70,000, B is a polymer block composed mainly of a conjugated diene, and X is a residual group of a coupling agent or a polyfunctional initiator such as an organo polylithium compound, the weight ratio of the aromatic vinyl hydrocarbon to the conjugated diene being 60:40 through 95:5.
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