POLYIMIDE FILM AND METHOD FOR PRODUCING SAME

WIPO Patent Application WO/2018/147605

A1

One embodiment may provide a method for producing a polyimide film, the method comprising the steps of: polishing the surface of a casting body; producing a gel sheet by casting a precursor on the polished surface of the casting body, and drying same; and producing a polyimide film by heat-treating the gel sheet, wherein the roughness of the polished surface of the casting body is 0.1 nm to 160 nm, and when the area of the casting body onto which the precursor is casted is partitioned by 1 cm x 1 cm, the area corresponding to a defect reduction region is at least 90%, and here, the defect reduction region means a region, in the partitioned 1 cm x 1 cm region, that satisfies the condition whereby the number of a first groove, a second groove, a third groove and a fourth groove, which have a width of 0.3 µm to 3 µm, a depth of 0.5 µm to 5 µm, and a length of at least 2 µm to less than 3 µm, at least 3 µm to less than 5 µm, at least 5 µm to less than 10 µm and at least 10 µm, respectively, is at most 10, at most five, at most three and zero, respectively, and the polyimide film has a yellowness of at most 3, a haze of at most 1%, a permeability of at least 88%, a modulus of at least 5.0 GPa and a surface hardness of at least HB.

KIM SUNHWAN (KR)
LEE JIN WOO (KR)
OH DAE SEONG (KR)
JEONG DAWOO (KR)
KIM KYU-HUN (KR)

PCT/KR2018/001490

August 16, 2018

February 05, 2018

Click for automatic bibliography generation  

SKC CO LTD (KR)

C08G73/14; C08G73/10; C08J5/18

KR20160094086A	2016-08-09
US6403005B1	2002-06-11
KR101090913B1	2011-12-08
KR20160095910A	2016-08-12
KR20160082639A	2016-07-08

FIRSTLAW P.C. (KR)

View/Download PDF      PDF Help

Previous Patent: PORTABLE DRONE JAMMER

Next Patent: POLYAMIDE-IMIDE FILM AND METHOD FOR PREPARING SAME