National Science Council

Tatung Company

Chin-Ping Yang

Sheng-Huei Hsiao

Jiun-Hung Lin

Wen-Tung Chen

Chein-Shyong Su

Shin-Hung Chen

Huei-Wen Yang

The present invention provides polyimides and co-polyimides that are organosoluble. The polyimides and co-polyimides are prepared from an aromatic diamine having ortho-linked phenylene and pendant tert-butyl group, i.e., 1,2-bis(4-aminophenoxy)-4-tert-butyl-benzene, or its mixture with other diamines, and a mixture of dianhydrides that containing at least one dianhydride selected from s-BPDA, DSDA, ODPA, 6FDA and other diether-dianhydrides.

Organic-soluble aromatic polyimides, organic solutions and preparation thereof

The present invention provides polyimides and co-polyimides that are organosoluble. The polyimides and co-polyimides are prepared from an aromatic diamine having tert-butyl group, i.e., 1,4-bis(4-aminophenoxy)-2-tert-butyl-benzene, or its mixture with other diamines, and a mixture of dianhydrides that containing DSDA or 6FDA or other diether-dianhydrides.

Organic-soluble aromatic polyimides, organic solutions and preparation

The present invention provides a series of easily processable poly(ether-imide)s that are organic-soluble and can afford colorless films, their organic solutions and their manufacturing process. The poly(ether-imide) is prepared from a dianhydride and a diamine, wherein the dianhydride is a bis(ether anhydride) having tert-butyl group, i. e. 1,4-bis(3,4-dicarboxyphenoxy)-2-tert-butylbenzene dianhydride.

1,4-bis(3,4-dicarboxyphenoxy)-2-tert-butylbenzene dianhydride and method

The present invention provides a series of easily processable poly(ether-imide)s that are organic-soluble and can afford colorless films, their organic solutions and their manufacturing process. The poly(ether-imide) is prepared from a dianhydride and a diamine, wherein the dianhydride is a bis(ether anhydride) having tert-butyl group, i.e. 1,4-bis(3,4-dicarboxyphenoxy)-2-tert-butylbenzene dianhydride. The present invention is also directed to synthesis of this special dianhydride.

Colorless organic-soluble aromatic poly(ether-imide)s, the organic

Disclosed is a poly(amide-ether-imide) and the preparation of the same. An ether chain-containing aromatic diamine is subject to thermal condensation with trimellitic anhydride (TMA) in a polar solvent to obtain diimide dicarboxylic acid, followed by polycondensing the diimide dicarboxlic acid with diamine to form the poly(amide-ether-imide). The poly(amide-ether-imide) of the present invention has superior strength, heat resistance, and processability. The preparation of the present invention is simple and economic.

Poly(amide-ether-imide)s

A compound or polymer having a bis(phenoxy)naphthalene structure, a high molecular weight, and very good mechanical performance and heat-resistivity is provided. The polymer can be polyamides, polyimides or poly(amide-imide)s and can have a basic structure of ##STR1## wherein R1 is a naphthalene ring.

Bis(4-aminophenoxy)naphthalene and its polymers

Diimide dicarboxylic acid

A method of recovering and separating water-soluble cyclodextrins from cyclodextrin formation liquid, wherein the CD formation liquid or the CD liquid after separating .beta.-CD by concentrated precipitation method is mixed with .alpha.-amylase to hydrolyze dextrins to small oligosaccharides, then is concentrated and precipitated again to separate the remained .beta.-CD, after that, soluble .alpha.- and .gamma.-CD are recovered by using inclusion extraction method with organic solvent from the residual liquid.

Growing community of inventors

Taipei, Taiwan

Chin-Ping Yang