Fiber-reinforced thermoplastic resin composition

Abstract

A fiber-reinforced thermoplastic resin composition comprising 5-50 parts by weight of reinforcing fibers (A) at least including carbon fibers, 20-94.5 parts by weight of a thermoplastic resin (B), and 0.5-30 parts by weight of a rosin resin (C), wherein the rosin resin (C) has an acid value of 100 mgKOH / g or greater and / or a hydroxyl value of 100 mgKOH / g or greater. Due to the inclusion of both the reinforcing fibers at least including carbon fibers and the specific rosin resin, this fiber-reinforced thermoplastic resin composition has the high reinforcing effect of the reinforcing fibers and can give molded fiber-reinforced thermoplastic resin articles excellent in terms of tensile strength, impact strength, and appearance quality, particularly blackness.

Claims

1. A fiber-reinforced thermoplastic resin composition comprising 5 to 50 parts by weight of reinforcing fibers (A) containing at least carbon fibers, 20 to 94.5 parts by weight of thermoplastic resin (B), and 0.5 to 30 parts by weight of rosin resin (C), wherein the rosin resin (C) has an acid value and / or hydroxyl value of 100 mg KOH / g or more, and the thermal loss of the rosin resin (C) at 270°C is less than 5%.

2. The fiber-reinforced thermoplastic resin composition according to claim 1, comprising 1 to 100 parts by weight of rosin resin (C) per 100 parts by weight of the reinforcing fiber (A).

3. The fiber-reinforced thermoplastic resin composition according to claim 1, wherein the rosin resin (C) is modified.

4. The fiber-reinforced thermoplastic resin composition according to claim 1, wherein the rosin resin (C) comprises at least one selected from the group consisting of hydrogenated rosin, polymerized rosin, acid-modified rosin, rosin ester, and rosin polyol.

5. The fiber-reinforced thermoplastic resin composition according to claim 1, wherein the reinforcing fiber (A) further comprises at least one selected from the group consisting of organic fibers and glass fibers.

6. The fiber-reinforced thermoplastic resin composition according to claim 5, wherein the organic fiber is at least one selected from the group consisting of polyamide fibers, polyester fibers, liquid crystal polyester fibers, polyarylene sulfide fibers, and fluororesin fibers.

7. The fiber-reinforced thermoplastic resin composition according to any one of claims 1 to 6, wherein the weight-average fiber length (Lw) of the reinforcing fiber (A) is 0.1 to 7.0 mm.

8. The fiber-reinforced thermoplastic resin composition according to claim 7, wherein the thermoplastic resin (B) comprises at least one selected from the group consisting of polyamide resin, polyolefin resin, polycarbonate resin, and polyphenylene sulfide resin.

9. The fiber-reinforced thermoplastic resin composition according to claim 7, wherein the thermoplastic resin (B) comprises at least two different thermoplastic resins (Ba) and (Bb).

10. The fiber-reinforced thermoplastic resin composition according to claim 9, wherein the thermoplastic resin (Bb) is a thermoplastic resin having a reactive functional group, and the composition contains 20 to 94.5 parts by weight of a melt-kneaded resin composition (B1) obtained by melt-kneading a thermoplastic resin (Ba) and a thermoplastic resin (Bb), the melt-kneaded resin composition (B1) contains a compound (Bc) produced by the reaction of the thermoplastic resin (Ba) and the resin having a reactive functional group (Bb) with the resin (Ba) and the resin (Bb), and the melt-kneaded resin composition (B1) is in which the resin having a reactive functional group (Bb) is dispersed in particulate form in the thermoplastic resin (Ba) with a number average particle size of 10 to 1,000 nm.

11. The fiber-reinforced thermoplastic resin composition according to claim 10, wherein the thermoplastic resin (Ba) contained in the melt-kneaded resin composition (B1) forms a continuous phase, the resin having a reactive functional group (Bb) forms a dispersed phase, and the dispersed phase contains fine particles of compound (Bc) with a particle size of 1 to 100 nm.

12. The fiber-reinforced thermoplastic resin composition according to claim 11, wherein the area ratio of the fine particles comprising the compound (Bc) in the dispersed phase comprising the resin (Bb) is 20% or more.

13. The fiber-reinforced thermoplastic resin composition according to claim 10, wherein the reactive functional group of the resin (Bb) is at least one selected from an amino group, a carboxyl group, a metal salt of a carboxyl group, an epoxy group, an acid anhydride group, and an oxazoline group.

14. The fiber-reinforced thermoplastic resin composition according to claim 9, wherein the thermoplastic resin (Ba) is a polyamide resin and the resin (Bb) is a polyolefin resin.

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