Thermoplastic elastomer composition and molded article thereof

Abstract

To provide a thermoplastic elastomer composition which is excellent in both strength (tensile strength etc.) and elongation (maximum elongation or breaking elongation) even when a fibrous reinforcement (especially a fibrous reinforcement with a fiber diameter of a micrometer size) is contained therein, and provide a molded body of the same as well as a method for improving the elongation of the thermoplastic elastomer.SOLUTION: A thermoplastic elastomer composition is prepared, which at least contains a thermoplastic elastomer (A), a fibrous reinforcement (B) at least containing cellulose fiber with a fiber diameter of 1 μm or more, and a compound (C) having a 9,9-bisaryl fluorene skeleton. A thermoplastic elastomer composition may be prepared, which at least contains a thermoplastic elastomer (A) at least containing a polyurethane-based thermoplastic elastomer and the fibrous reinforcement (B) at least containing cellulose fiber with the fiber diameter of 1 μm or more.SELECTED DRAWING: None

Claims

1. A thermoplastic elastomer composition comprising at least a thermoplastic elastomer (A) and a fibrous reinforcing material (B), The fibrous reinforcing material (B) comprises at least cellulose fibers (B1), The cellulose fiber (B1) contains at least cellulose fibers with a fiber diameter of 1 μm or more. The average fiber diameter of the cellulose fiber (B1) is 1 to 100 μm. Furthermore, a thermoplastic elastomer composition comprising at least a compound (C) having a 9,9-bisarylfluorene skeleton.

2. The thermoplastic elastomer composition according to claim 1, wherein the thermoplastic elastomer (A) comprises at least one selected from polystyrene-based thermoplastic elastomers, polyolefin-based thermoplastic elastomers, polyurethane-based thermoplastic elastomers, polyester-based thermoplastic elastomers, and polyamide-based thermoplastic elastomers.

3. The thermoplastic elastomer composition according to claim 1 or 2, wherein the proportion of the thermoplastic elastomer (A) is 30% by mass or more with respect to the entire thermoplastic elastomer composition.

4. The thermoplastic elastomer composition according to claim 1 or 2, wherein the proportion of the fibrous reinforcing material (B) is 0.1 to 50% by mass with respect to the total amount of the thermoplastic elastomer (A), the fibrous reinforcing material (B), and the compound (C) having a 9,9-bisarylfluorene skeleton.

5. The compound (C) having the 9,9-bisarylfluorene skeleton is given by the following formula (1) 【Chemistry 1】 [In the formula, R １ represents a substituent, and k represents an integer from 0 to 8. Ring Z １ and Z ２ These independently represent aromatic hydrocarbon rings. R ２ａ and R ２ｂ m1 and m2 independently represent substituents, and m1 and m2 independently represent integers of 0 or greater. X １ and X ２ It is independently based on [(OA)] ｎ -Y] (In the formula, Y represents a hydroxyl group, a mercapto group, a glycidyloxy group, or a (meth)acryloyloxy group, A represents an alkylene group, and n represents an integer of 0 or more.) Alternatively, it represents an amino group, and p1 and p2 independently represent integers of 1 or more. A thermoplastic elastomer composition according to claim 1 or 2, comprising a compound represented by [the specified compound].

6. The compound (C) having the 9,9-bisarylfluorene skeleton is given by the following formula (1A) 【Chemistry 2】 (In the formula, R １ represents an alkyl group, and k represents an integer of 0 to 2, Ring Z １ and Z ２ These independently represent a benzene ring or a naphthalene ring. R ２ａ and R ２ｂ m1 and m2 independently represent an alkyl group, cycloalkyl group, aryl group, aralkyl group, or alkoxy group, and m1 and m2 independently represent an integer from 0 to 2. A １ and A ２ C is independent ２－４ (This represents an alkylene group, where n1 and n2 independently represent integers from 0 to 15, and p1 and p2 independently represent integers from 1 to 3.) A thermoplastic elastomer composition according to claim 1 or 2, comprising a compound represented by [the specified compound].

7. The proportion of the compound (C) having the 9,9-bisarylfluorene skeleton is 0.1 to 10% by mass relative to the total amount of the thermoplastic elastomer (A), the fibrous reinforcing material (B), and the compound (C) having the 9,9-bisarylfluorene skeleton. The thermoplastic elastomer composition according to claim 1 or 2, wherein the proportion of the compound (C) having the 9,9-bisarylfluorene skeleton is 0.1 to 50 parts by mass per 100 parts by mass of the fibrous reinforcing material (B).

8. A molded article comprising at least the thermoplastic elastomer composition according to claim 1 or 2.

9. A method for improving both strength and elongation of a thermoplastic elastomer (A) by adding a fibrous reinforcing material (B) and a compound (C) having a 9,9-bisarylfluorene skeleton, The fibrous reinforcing material (B) comprises at least cellulose fibers (B1), The cellulose fiber (B1) contains at least cellulose fibers with a fiber diameter of 1 μm or more. A method wherein the average fiber diameter of the cellulose fiber (B1) is 1 to 100 μm.

10. The method according to claim 9, wherein the elongation of the following test piece molded by injection molding is improved by 25% or more compared to the maximum elongation of the thermoplastic elastomer (A) measured under the following conditions in accordance with JIS K 7161. Test specimen: A12 dumbbell test specimen (total length 75 mm, distance between chucks 58 mm, width 5 mm, thickness 2 mm, distance between gauge marks 25 mm) Tensile speed: 0.25 mm / min in the elongation range of 0-0.3%. 50 mm / min in sections with elongation of 0.3% or more Gripping part: Air chuck type

11. A thermoplastic elastomer composition comprising at least a thermoplastic elastomer (A) and a fibrous reinforcing material (B), The thermoplastic elastomer (A) comprises at least a polyurethane-based thermoplastic elastomer, The fibrous reinforcing material (B) comprises at least cellulose fibers (B1), The cellulose fiber (B1) contains at least cellulose fibers with a fiber diameter of 1 μm or more. A thermoplastic elastomer composition that does not contain a compound (C) having a 9,9-bisarylfluorene skeleton.

12. The thermoplastic elastomer composition according to claim 11, wherein the proportion of the thermoplastic elastomer (A) is 30% by mass or more with respect to the entire thermoplastic elastomer composition.

13. The thermoplastic elastomer composition according to claim 11 or 12, wherein the average fiber diameter of the cellulose fibers (B1) is 1 to 100 μm.

14. The thermoplastic elastomer composition according to claim 11 or 12, wherein the proportion of the fibrous reinforcing material (B) is 0.1 to 50% by mass with respect to the total amount of the thermoplastic elastomer (A) and the fibrous reinforcing material (B).

15. A molded article comprising at least the thermoplastic elastomer composition according to claim 11 or 12.

16. A method for improving elongation by adding a fibrous reinforcing material (B) to a thermoplastic elastomer (A), The thermoplastic elastomer (A) comprises at least a polyurethane-based thermoplastic elastomer, The fibrous reinforcing material (B) comprises at least cellulose fibers (B1), The cellulose fiber (B1) comprises at least cellulose fibers with a fiber diameter of 1 μm or more. A method that does not involve adding a compound (C) having a 9,9-bisarylfluorene skeleton.

17. The method according to claim 16, wherein the elongation of the following test piece molded by injection molding is improved by 10% or more compared to the maximum elongation of the thermoplastic elastomer (A) measured under the following conditions in accordance with JIS K 7161. Test specimen: A12 dumbbell test specimen (total length 75 mm, distance between chucks 58 mm, width 5 mm, thickness 2 mm, distance between gauge marks 25 mm) Tensile speed: 0.25 mm / min in the elongation range of 0-0.3%. 50 mm / min in sections with elongation of 0.3% or more Gripping part: Air chuck type

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