Claims
- 1. A block copolymer composition which comprises (a) a block copolymer comprising a polymer block segment mainly composed of a monoalkenyl aromatic compound and a polymer block segment mainly composed of a conjugated diene compound, the content of the monoalkenyl aromatic compound being 5-95% by weight based on the total weight of the block copolymer, (b) a phenolic stabilizer represented by the following formula (I): (wherein R1 and R3 are —CH2—S—R5 in which R5 represents an alkyl group of 1-18 carbon atoms, R2 represents a hydrogen atom or a methyl group, and R4 represents an alkyl group of 1-8 carbon atoms or a cycloalkyl group of 5-12 carbon atoms), and (c) at least one phenolic stabilizer selected from phenolic compounds represented by the following formulas, (II)-(V): (wherein R6 is represented by the following formula (VI): R7 represents an alkyl group of 2-22 carbon atoms, and R8-R12 each represent a hydrogen atom or an alkyl group of 1-6 carbon atoms, with a proviso that two or more of R8-R12 are alkyl groups), the content of the phenolic stabilizer (b) being more than 0.05 part by weight and less than 0.6 part by weight and that of the phenolic stabilizer (c) being not less than 0.05 part by weight and not more than 0.8 part by weight based on 100 parts by weight of the block copolymer (a).
- 2. A block copolymer composition according to claim 1, wherein the component (a) is a block copolymer shown by the formula: (A-B)n, (A-B)nA or (B-A)nB (wherein A is a polymer block segments mainly composed of monoalkenyl aromatic compound, B is a polymer block segment mainly composed of conjugated diene compound, and n is an integer of 1 or more).
- 3. A block copolymer composition according to claim 1, wherein the component (a) is a block copolymer shown by the formula: [(A-B)n]m-X, [(A-B)nA]m-X or [(B-A)nB]m-X (wherein A is a polymer block segment mainly composed of monoalkenyl aromatic compound, B is a polymer block segment mainly composed of conjugated diene compound, n is an integer of 1 or more, m is an integer of 3 or more, and X represents a residue of a trifunctional or higher functional coupling agent or a residue of a trifunctional or higher polyfunctional organolithium compound).
- 4. A block copolymer composition according to any one of claims 1-3, wherein the block copolymer (a) has a number average molecular weight of 20,000-800,000, and the content of the monoalkenyl aromatic compound is 5-60% by weight based on the total weight of the block copolymer.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2000-049174 |
Feb 2000 |
JP |
|
Parent Case Info
This application is the national phase under 35 U.S.C. §371 of PCT International Application No. PCT/JP01/01317 which has an International filing date of Feb. 22, 2001, which designated the United States of America and was not published in English.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/JP01/01317 |
|
WO |
00 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO01/62849 |
8/30/2001 |
WO |
A |
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4759862 |
Meier et al. |
Jul 1988 |
A |
Foreign Referenced Citations (3)
Number |
Date |
Country |
4-246454 |
Sep 1992 |
JP |
6-279650 |
Oct 1994 |
JP |
2000-103906 |
Apr 2000 |
JP |