Industrial Technology Research Institute

Wen-Jeng Lin

Wu-Bin Yuo

Chien-Shiun Liao

Szu-Yuan Chan

Li-Kuei Lin

Tien-San Lee

Jian-Hong Chen

Yu-Shan Chao

Hsin-Herng Wang

Cheng Yu Yeh

Li-Kuel Lin

A copolyamide composition prepared from hexamethylene diamine and either mixtures of adipic acid and terephthalic acid, or mixtures of adipic acid, terephthalic acid and isophthalic acid, has a melting point below 320.degree. C., a glass transition temperature between 100.degree. C. and 120.degree. C. and physical properties similar to nylon 66.

Copolyamide composition with a high glass transition temperature

A copolyamide composition prepared from hexamethylene diamine and mixtures of adipic acid, terephthalic acid and isophthalic acid, has a melting point below 300.degree. C., a glass transition temperature between 100.degree. C. and 130.degree. C. and physical properties similar to nylon 66.

Copolyamide composition with a high glass transition temperature and a

A catalyst composition for use in the preparation of poly(butylene terephthalate) from dimethyl terephthalate, comprising: (a) a titanium compound primary catalyst, from about 0.0005 PHR to about 5 PHR; (b) a first co-catalyst containing at least one of Zn, Co, Mn, Mg, Ca, or Pb series compounds, between about 0.0001 PHR and 5 PHR; and (c) a second co-catalyst containing an alkali metal phosphate, an alkali metal phosphite, an alkali hypophosphite, or an alkali metal polyphosphate between about 0.0001 PHR and 5 PHR; wherein PHR represents parts of the primary catalyst or the co-catalyst per one hundred parts, by weight, of dimethyl terephthalate. Preferred titanium compounds include tetrabutyl titanate or tetra(isopropyl)titanate. Preferred metal compounds for use as first co-catalyst are metal acetates. The alkali metal phosphate can be a phosphate salt containing one, two, or three metal groups; and the alkali metal phosphite can be a phosphite salt containing one or two metal groups. The alkali metal hypophosphite can be a hypophosphite salt containing any number of alkali metal groups. The alkali metal polyphosphate can be a polyphosphate salt containing one, two, three, four, or five alkali metal groups. With this catalyst composition, the rate of polycondensation was increased by 40 percent or more. The catalyst composition is also effective in the preparation of poly(butylene terephthalate) from terephthalic acid.

Catalytic compositions containing tetrabutyl titanate and a mixture of

A catalyst composition for use in the preparation of poly(butylene terephthalate) from dimethyl terephthalate, comprising: (a) a titanium compound primary catalyst, from about 0.01 PHR to about 1 PHR; and (b) an alkali metal phosphate or alkali metal phosphite co-catalyst, from about 0.001 PHR to about 1 PHR; wherein PHR represents parts of the primary catalyst or the co-catalyst per one hundred parts, by weight, of dimethyl terephthalate. Preferred titanium compounds include tetrabutyl titanate or tetra(isopropyl) titanate; the alkali metal phosphate can be a phosphate salt containing one, two, or three metal groups; and the alkali metal phosphite can be a phosphite salt containing one or two metal groups. With this catalyst composition, the transesterification rate was increased by 10 percent or more. Furthermore, the reaction product poly(butylene terephthalate) shows an increased intrinsic viscosity over those without the co-catalyst, indicating a greater degree of polymerization.

Catalytic compositions for the preparation of poly(butylene

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Wen-Jeng Lin