Polyamide resin composition, molded body thereof, and method for manufacturing laser-welded body
AssigneeMitsui Chemicals, Inc.
InventorsKohei Nishino, Yohei Hotani, Isao Washio
Life of this patent
Estimating the term…
Abstract
This polyamide resin composition contains: 30-89.9 parts by mass of a polyamide resin (A) having a melting point of at least 300° C.; 0-45 parts by mass of a polyamide resin (B) having substantially no melting point; 0.1-5 parts by mass of a light-transmitting pigment (C); and 10-55 parts by mass of a fibrous filler (D) (the total amount of (A), (B), (C), and (D) is 100 parts by mass). The polyamide resin (A) contains at least a terephthalic acid-derived component unit. In a molded body of the polyamide resin composition, the corrected heat of fusion (ΔHR) is 10-70 J/g, and the transmittance of laser light having a wavelength of 940 nm is at least 15% at a thickness of 1.6 mm.
Claims14
A polyamide resin composition, comprising:
- 30 to 89.9 parts by mass of a polyamide resin (A) having a melting point of 300° C. or more as measured with a differential scanning calorimeter (DSC);
- 0 to 45 parts by mass of a polyamide resin (B) having substantially no melting point as measured with a differential scanning calorimeter (DSC);
- 0.1 to 5 parts by mass of a light-transmitting pigment (C);
- and
- 10 to 55 parts by mass of a fibrous filler (D),
- wherein the total of components (A), (B), (C), and (D) is 100 parts by mass,
- wherein the polyamide resin (A) contains a dicarboxylic acid-derived component unit (a1) and a diamine-derived component unit (a2),
- the dicarboxylic acid-derived component unit (a1) contains 20 to 100 mol % of a component unit derived from terephthalic acid, and 0 to 80 mol % of at least one of a component unit derived from an aromatic dicarboxylic acid other than terephthalic acid and a component unit derived from an aliphatic dicarboxylic acid having 4 to 20 carbon atoms, relative to a total of 100 mol % of the dicarboxylic acid-derived component unit (a1),
- the diamine-derived component unit (a2) contains at least one of a component unit derived from an aliphatic diamine having 4 to 15 carbon atoms and a component unit derived from alicyclic diamine having 4 to 20 carbon atoms,
- wherein the light-transmitting pigment (C) does not have a local maximum value of an absorption wavelength within the wavelength range of 800 to 1064 nm, and
- wherein a mass ratio-corrected heat of fusion (ΔHR) of the polyamide resin composition is 10 to 70 J/g, wherein the ΔHR being a value obtained by dividing a heat of fusion (ΔH) of the polyamide resin composition by a ratio of the total mass of the components other than the fibrous filler (D) to a total mass of the polyamide resin composition, the heat of fusion (ΔH) being measured with a differential scanning calorimeter (DSC), and
- a molded body of the polyamide resin composition has a laser light transmittance of 15% or more at a wavelength of 940 nm at a thickness of 1.6 mm.
Dependencies are inferred from the claim text.