US 12,234,326 B2
Polyphenylene sulfide resin composition and molded article
Keita Tokuzumi, Nagoya (JP); and Kazuya Okubo, Nagoya (JP)
Assigned to Toray Industries, Inc., Tokyo (JP)
Appl. No. 17/440,262
Filed by Toray Industries, Inc., Tokyo (JP)
PCT Filed Mar. 19, 2020, PCT No. PCT/JP2020/012317
§ 371(c)(1), (2) Date Sep. 17, 2021,
PCT Pub. No. WO2020/196273, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 2019-059992 (JP), filed on Mar. 27, 2019; and application No. 2019-224205 (JP), filed on Dec. 12, 2019.
Prior Publication US 2022/0010073 A1, Jan. 13, 2022
Int. Cl. C08L 81/04 (2006.01); C08G 75/0259 (2016.01); C08K 3/26 (2006.01); C08K 7/14 (2006.01)
CPC C08G 75/0259 (2013.01) [C08K 3/26 (2013.01); C08K 7/14 (2013.01); C08K 2003/265 (2013.01); C08K 2201/019 (2013.01)] 7 Claims
 
1. A polyphenylene sulfide resin composition comprising a blend of:
100 parts by weight of a polyphenylene sulfide resin (A) having a minimum melt flow rate of 1000 g/10 min;
100 to 250 parts by weight of a modified cross-section glass fiber (B) having a flattening ratio of 1.3 to 10; and
25 to 150 parts by weight of a non-fibrous inorganic filler (C);
wherein the non-fibrous inorganic filler (C): has a Mohs hardness of more than 2 and less than 4, has a melting point or softening point of 380° C. or more, and is selected from the group consisting of mica, carbonates, and sulfates;
wherein a ratio X/Y of a blending weight X of said modified cross-section glass fiber (B) to a blending weight Y of said non-fibrous inorganic filler (C) is more than 1 and less than 7, such that the polyphenylene sulfide resin composition has low linear expansion, low anisotropy, and low swelling properties;
wherein the low linear expansion corresponds to: a maximum coefficient of linear expansion in the machine direction (MD) of 1.9×10−5/K and a maximum coefficient of linear expansion in the traverse direction (TD) of 1.8×10−5/K;
wherein the low anisotropy corresponds to: a maximum difference between the coefficient of linear expansion in the MD and the coefficient of linear expansion in the TD of 0.1 ×10−5K, and a maximum creep ratio of 1.5; and
wherein the low swelling properties correspond to: a maximum swelling ratio in the MD of 0.06% and a maximum swelling ratio in the TD of 0.07%.
 
6. A molded article composed of said polyphenylene sulfide resin composition according to claim 1.
 
7. A housing part comprising the molded article according to claim 6.