US 11,865,750 B2
Composite structure and housing for electronic device
Takahiro Tominaga, Ichihara (JP); and Kazuki Kimura, Sodegaura (JP)
Assigned to MITSUI CHEMICALS, INC., Tokyo (JP)
Appl. No. 17/267,342
Filed by MITSUI CHEMICALS, INC., Tokyo (JP)
PCT Filed Aug. 7, 2019, PCT No. PCT/JP2019/031237
§ 371(c)(1), (2) Date Feb. 9, 2021,
PCT Pub. No. WO2020/032138, PCT Pub. Date Feb. 13, 2020.
Claims priority of application No. 2018-151598 (JP), filed on Aug. 10, 2018; and application No. 2018-215777 (JP), filed on Nov. 16, 2018.
Prior Publication US 2021/0237322 A1, Aug. 5, 2021
Int. Cl. B29C 45/14 (2006.01); B29C 45/27 (2006.01); B29C 65/56 (2006.01); B29C 65/00 (2006.01); B29K 75/00 (2006.01); B29K 705/02 (2006.01); B29L 31/34 (2006.01)
CPC B29C 45/14467 (2013.01) [B29C 45/2708 (2013.01); B29C 65/56 (2013.01); B29C 66/7422 (2013.01); B29K 2075/00 (2013.01); B29K 2705/02 (2013.01); B29K 2715/00 (2013.01); B29L 2031/3481 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A composite structure comprising:
a metal member; and
a thermoplastic resin member bonded to the metal member,
wherein the metal member has a fine uneven structure at least on a metal surface to which the thermoplastic resin member is bonded,
a hardness of the thermoplastic resin member measured by a type A durometer in accordance with JIS K6253 is in a range of equal to or more than A60 and equal to or less than A95, and
an acid value of the thermoplastic resin member is equal to or more than 1 mgKOH/g and equal to or less than 100 mgKOH/g,
wherein an average length (RSm) of a roughness curve element of the metal surface on which the fine uneven structure is formed, the average length being measured in accordance with JIS B0601: 2001, is equal to or more than 10 nm and equal to or less than 500 μm;
a ten-point average roughness (Rzjis) of the metal surface on which the fine uneven structure is formed, the ten-point average roughness being measured in accordance with JIS B0601: 2001, is equal to or more than 10 nm and equal to or less than 300 μm;
the thermoplastic resin member contains a thermoplastic elastomer; and
the thermoplastic elastomer consists of an elastic material that does not need to be vulcanized,
wherein the thermoplastic resin member contains a urethane-based thermoplastic elastomer and an amide-based thermoplastic elastomer,
wherein the thermoplastic resin member further contains an acid-modified polymer,
wherein, in the thermoplastic elastomer, a content of the urethane-based thermoplastic elastomer is equal to or more than 70% by mass and equal to or less than 99% by mass, and a content of the amide-based thermoplastic elastomer is equal to or more than 1% by mass and equal to or less than 30% by mass, and
wherein, in the thermoplastic resin member, a content of the thermoplastic elastomer is equal to or more than 60% by mass and equal to or less than 95% by mass, and a content of the acid-modified polymer is equal to or more than 5% by mass and equal to or less than 40% by mass.