Methods of reducing the amount of colorant in a multilayer film
AssigneeE. I. Du Pont de Nemours and Company
InventorsTHOMAS EDWARD CARNEY, JEFFREY MICHAEL BARTOLIN, CHRISTOPHER ROBERT BECKS
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Abstract
The present disclosure is directed to methods of reducing the amount of colorant in a multilayer film and achieving an L* color less than 30 and a 60 degree gloss value less than 10. The multilayer film has a first polyimide layer and a second polyimide layer containing a matting agent, submicron carbon black and submicron fumed metal oxide.
Claims19
A method of reducing the amount of colorant in a multilayer film and achieving an L* color less than 30 and a 60 degree gloss value less than 10, the method comprising:
- a) providing a first polyimide layer;
- b) providing a polyamic acid solution containing polyamic acid, silica matting agent, and submicron carbon black for forming a second polyimide layer;
- c) adding at least one submicron fumed metal oxide to the polyamic acid solution;
- d) coating the polyamic acid solution on to the first polyimide layer;
- and
- e) imidizing the coating to form the second polyimide layer on the first polyimide layer.
A method of reducing the amount of colorant in a multilayer film and achieving an L* color less than 30 and a 60 degree gloss value less than 10, the method comprising:
- a) providing a polyamic acid green film for forming a first polyimide layer;
- b) providing a polyamic acid solution containing polyamic acid, silica matting agent, and submicron carbon black for forming a second polyimide layer;
- c) adding at least one submicron fumed metal oxide to the polyamic acid solution;
- d) coating the polyamic acid solution on to the polyamic acid green film;
- and
- e) imidizing the coating and the polyamic acid green film to form the first and second polyimide layers.
A method of reducing the amount of colorant in a multilayer film and achieving an L* color less than 30 and a 60 degree gloss value less than 10, the method comprising:
- a) providing a first polyamic acid solution containing a first polyamic acid for forming a first polyimide layer;
- b) providing a second polyamic acid solution containing a second polyamic acid, silica matting agent, and submicron carbon black for forming a second polyimide layer;
- c) adding at least one submicron fumed metal oxide to the second polyamic acid solution;
- d) coextruding the second polyamic acid solution and the first polyamic acid solution;
- and
- e) imidizing the coextruded layers to form the first and second polyimide layers.
A method of reducing the amount of colorant in a multilayer film and achieving an L* color less than 30 and a 60 degree gloss value less than 10, the method comprising:
- a) providing a first polyamic acid solution containing a first polyamic acid for forming a first polyimide layer;
- b) providing a second polyamic acid solution containing a second polyamic acid, a first silica matting agent, and a first submicron carbon black for forming a second polyimide layer;
- c) providing a third polyamic acid solution containing a third polyamic acid, a second silica matting agent, and a second submicron carbon black for forming a third polyimide layer;
- d) adding at least one first submicron fumed metal oxide to the second polyamic acid solution;
- e) adding at least one second submicron fumed metal oxide to the third polyamic acid solution;
- f) coextruding the first, second and third polyamic acid solutions, wherein the second and third polyamic acid solutions are in direct contact with opposite sides of the first polyamic acid solution;
- and
- g) imidizing the coextruded layers to form the first, second and third polyimide layers.
Dependencies are inferred from the claim text.