国外专利(英文)

Porous polyimide film/JP2014231571A/宇部兴产株式会社The invention,such porous polyimide film than conventional gas permeability of the material,with a high porosity,relatively high strength,in spite of the high porosity of the film excellent in resistance against compression stress in the thickness direction,and,on the side surface of the side surface(b)and(a)in the thickness direction of the structure is asymmetric,waterproof,stainproof polyimide.Solution:(a)and the surface has a surface(b),and(a)side surface and the side surface(b)is

Preparation method of polyimide/EP2832768A1/Changchun Hipolyking Co.,Ltd.;Ding Mengxian;The present invention provides a preparation method of polyimide,comprising the following steps：a）carrying out a dehydration polymerization reaction on a diamine and an anhydride of an organic acid in a non-polar solvent to obtain a mixture,the non-polar solvent being one and an anhydride of an organic acid in a non-polar solvent to obtain a mixture, the non-polar solvent being one or more of arene, aliphatic hydrocarbon, halogenated arene and halogenated aliphatic hydrocarbon, and the anhydride of the organic acid being one or more of dianhydride and single anhydride; and b） filtering the mixture obtained in step a） and drying to obtain the polyimide. In the present invention, the dehydration polymerization reaction between the diamine and the anhydride of the organic acid can be carded out directly in the non-polar solvent to obtain the polyimide which cannot be dissolved in the non-polar solvent. Therefore, polyimide powder with fine particles can be obtained by directly filtering and drying the reaction mixture without washing.