Title:
METHOD FOR PRODUCING POLYAMIDE-IMIDE FILM
Document Type and Number:
WIPO Patent Application WO/2018/147611
Kind Code:
A1
Abstract:
An embodiment can provide a method for producing a polyamide-imide film which is colorless and transparent and has excellent mechanical properties, the method comprising: a step of producing a polyamide-imide polymer solution by polymerizing an aromatic diamine compound, an aromatic dianhydride compound, and a dicarbonyl compound; a step of producing a gel sheet by extruding, casting and drying the polymer solution; and a step of producing a polyamide-imide film by heat-treating the gel sheet, wherein the viscosity of the polymer solution is 100,000 to 500,000 cps, and the polyamide-imide film has a yellowness index of 5 or lower, a haze of 2% or lower, a transmittance of 85% or above and a modulus of 5.0 GPa or above, at a thickness of 20㎛ to 75㎛.
Inventors:
OH DAE SEONG (KR)
JEONG DAWOO (KR)
KIM SUNHWAN (KR)
LEE JIN WOO (KR)
LIM DONG JIN (KR)
KIM CHEOL HO (KR)
JEONG DAWOO (KR)
KIM SUNHWAN (KR)
LEE JIN WOO (KR)
LIM DONG JIN (KR)
KIM CHEOL HO (KR)
Application Number:
PCT/KR2018/001533
Publication Date:
August 16, 2018
Filing Date:
February 06, 2018
Export Citation:
Assignee:
SKC CO LTD (KR)
International Classes:
C08G73/14; B29C39/02; B29C71/02; C08G73/10; C08J5/18; B29C48/08
Foreign References:
| KR20160081829A | 2016-07-08 | |||
| KR20150076114A | 2015-07-06 | |||
| KR20170001644A | 2017-01-04 | |||
| KR20160081845A | 2016-07-08 | |||
| KR101519937B1 | 2015-05-13 |
Attorney, Agent or Firm:
FIRSTLAW P.C. (KR)
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