US 12,139,601 B2
Method for improving tracking resistance of thermoplastic resin
Itsuki Saito, Fuji (JP); Yoshihiro Asai, Fuji (JP); and Kazuya Goshima, Fuji (JP)
Assigned to POLYPLASTICS CO., LTD., Tokyo (JP)
Appl. No. 17/434,226
Filed by Polyplastics Co., Ltd., Tokyo (JP)
PCT Filed Mar. 24, 2020, PCT No. PCT/JP2020/012870
§ 371(c)(1), (2) Date Aug. 26, 2021,
PCT Pub. No. WO2020/196470, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 2019-056265 (JP), filed on Mar. 25, 2019.
Prior Publication US 2022/0119638 A1, Apr. 21, 2022
Int. Cl. C08L 67/02 (2006.01)
CPC C08L 67/02 (2013.01) [C08L 2203/20 (2013.01)] 12 Claims
 
1. A method for improving the comparative tracking index (CTI) of a thermoplastic resin, as measured subsequently after a molding is prepared in compliance with IEC60112, 3rd edition, by blending a carbodiimide compound in the thermoplastic resin, wherein
the improving the comparative tracking index is (i) or (ii) below:
(i) improving from a CTI that is less than 500 V before the addition of a carbodiimide compound to a CTI that is 500 V or more after the addition of a carbodiimide compound, or
(ii) the ratio [(CTI-2)/(CTI-1]] of CTI (CTI-1) before the addition of a carbodiimide compound and the CTI (CTI-2) after the addition of a carbodiimide compound is 1.15 or more; and
the thermoplastic resin has one or more functional groups selected from a carboxy group, a hydroxy group, and an amino group.