C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 69/28 (2006.01) C08G 69/04 (2006.01)
Patent
CA 2277492
The invention relates to a method for producing polyamides, and to a method for producing primary polycondensates which are intermediates for polyamide production. More precisely, the invention relates to a method for producing primary polycondensates, which comprises a step of polycondensing a dicarboxylic acid component having a terephthalic acid content of from 60 to 100 mol% and a diamine component in which the amount of 1,9-nonanediamine and/or 2-methyl-1,8-octanediamine falls between 60 and 100 mol%, in the presence of water of being from 15 to 35 % by weight, at a reaction temperature falling between 250°C and 280°C and under a reaction pressure (P) that satisfies the following formula (1): P0 ~ P ~ 0.7P0 (1) where Po indicates the saturated vapor pressure of water at the reaction temperature, to form a primary polycondensate, followed by a step of taking the resulting primary polycondensate as formed in the previous step out of the reactor in an atmospheric environment while it is at a temperature within the same range as in the previous step and has a water content within the same range as in the previous step. The invention further relates to a method of polymerizing the primary polycondensate prepared previously into a polyamide having an increased molecular weight.
Matsunaga Susumu
Oka Hideaki
Tamura Kozo
Watanabe Kazunori
Kirby Eades Gale Baker
Kuraray Co. Ltd.
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