The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 06, 2001
Filed:
Apr. 21, 2000
Tung-Ying Kuo, Hsinchu, TW;
I-Min Tseng, Nantou, TW;
Jih-Chen Huang, Hsinchu, TW;
Wen-Chuan Shu, Hsien, TW;
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
The present invention provides a method for preparing polypropylene terephthalate/polyethylene terephthalate (PPT/PET) copolyester, which comprises a group of processes from (a) to (e). Process (a) comprises subjecting bis-2-hydroxyethyl terephthalate (BHET), pure terephthalic acid (PTA) and 1,3-propanediol (1,3-PDO) to undergo esterification reaction to produce BHET and bis-2-hydroxypropyl terephthalate (BHPT), and then subjecting BHET and BHPT to undergo copolymerization reaction. Process (b) comprises subjecting PTA and 1,3-PDO to undergo esterification reaction to produce BHPT, adding BHET, and then subjecting BHET and BHPT to undergo copolymerization reaction. Process (c) comprises subjecting BHET and BEPT to undergo copolymerization reaction. Process (d) comprises subjecting PTA, ethylene glycol (EG) and 1,3-PDO to undergo esterification reaction to produce BHET and BHPT, and then subjecting BHET and BHPT to undergo copolymerization reaction. Process (e) comprises subjecting BHPT, PTA and EG to undergo esterification reaction to produce BHPT and BHET, and then subjecting BHET and BHPT to undergo copolymerization reaction. The obtained preferred PPT/PET copolyester of the present invention has the following properties: intrinsic viscosity (IV)>0.6 dl/g, acid value (—COOH amount)<40 meq/kg, melting point=190° C.-250° C., L*>60, and b*<12. Therefore, the PPT/PET copolyester of the present invention is suitable for use as fiber and engineering plastic.