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Polytrimethylene terephthalate (PTT), is a polyester synthesized and patented in 1941.〔John Rex Whinfield and James Tennant Dickson (1941) "Improvements Relating to the Manufacture of Highly Polymeric Substances", UK Patent 578,079; "Polymeric Linear Terephthalic Esters", Publication date: March 22, 1949; Filing date: September 24, 1945; Priority date: July 29, 1941〕 It is produced by a method called condensation polymerization or transesterification. The two monomer units used in producing this polymer are: 1,3-propanediol and terephthalic acid or dimethyl terephthalate. Similar to polyethylene terephthalate, the PTT is used to make carpet fibers. PTT's value as a commercial polymer has improved due to more economical and efficient methods to produce 1,3-propanediol in the 1980s by Degussa, via acrolein, and Shell via the hydroformylation of ethylene oxide. DuPont has successfully commercialized the production of this polymer via 1,3-propanediol obtained by fermentation. These developments may allow PTT to effectively compete against PBT and PET, two polyesters that have been far more successful than PTT to date. ==Production== Similar to the ubiquitous poly(ethylene terephthalate), this polymer is prepared by the esterification of 1,3-propanediol (HO(CH2)3OH) with terephthalic acid (C6H4(COOH)2), or by transesterification of dimethyl terephthalate:〔 : C6H4(COOH)2 + HO(CH2)3OH → ()n + 2 H2O : C6H4(COOCH3)2 + HO(CH2)3OH → ()n + 2 CH3OH This polymer has been commercialized as Sorona by DuPont. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Polytrimethylene terephthalate」の詳細全文を読む スポンサード リンク
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