Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1995-03-28
1996-05-14
Seidleck, James J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528176, 528193, 528194, 528195, 528272, 528274, 528275, 528280, 528281, 528285, 502153, 502155, 502161, 502208, 502170, 502171, C08G 6302
Patent
active
055168795
ABSTRACT:
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.
REFERENCES:
patent: 4906724 (1990-03-01), Yamanaka et al.
Chen Jian-Hong
Lin Wen-Jeng
Wang Hsin-Herng
Yuo Wu-Bin
Industrial Technology Research Institute
Liauh W. Wayne
Mosley Terressa
Seidleck James J.
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