Polyimide film comprising omnidirectional polymer chain, method for manufacturing same, and graphite sheet manufactured using same
AssigneePI Advanced Materials Co., Ltd.
InventorsHyong Sop JO, Jae Hyun KIM
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Abstract
The present invention provides a method of manufacturing a polyimide film including unit polymers that are omnidirectionally distributed, and a polyimide film. The present invention also provides a graphite sheet having good quality manufactured using the polyimide film.
Claims17
A method of manufacturing a polyimide film, comprising:
- preparing a polyamic acid solution comprising first unit polymers by mixing a first organic solvent, a diamine monomer and a dianhydride monomer;
- preparing a precursor composition by mixing the polyamic acid solution, at least one imidization accelerator, and at least one dehydration agent;
- and
- forming a polyimide film comprising second unit polymers into which the first unit polymers are converted by imidizing the precursor composition at a variable temperature,
- wherein a processing condition (a) below is satisfied:
- 540 μm<C2*T<610 μm (a)
- wherein C is a sum of a molar amount of the imidization accelerator that is added and a molar amount of the dehydration agent that is added relative to 1 mol of an amic acid group of the polyamic acid, and T is a thickness of the polyimide film.
A polyimide film comprising second unit polymers in which an amic acid group of each of first unit polymers is converted into an imide group by catalyzing polyamic acid comprising the first unit polymers that are omnidirectionally distributed in a state of satisfying a processing condition (a) below, at least a portion of the second unit polymers being omnidirectionally distributed:
- 540 μm<C2*T<610 μm (a)
- wherein C is a sum of a molar amount of the imidization accelerator that is added and a molar amount of the dehydration agent that is added relative to 1 mol of an amic acid group of the polyamic acid, and T is a thickness of the polyimide film.
Dependencies are inferred from the claim text.