Production of aromatic polyamide

Details Production of aromatic polyamide Production of aromatic polyamide

C - Chemistry, Metallurgy

08

G

C08G 69/28 (2006.01) C08G 69/26 (2006.01) C08G 69/32 (2006.01)

Patent

CA 2177240

A process for producing an aromatic polyamide which comprises: (a) a dicarboxylic acid component which consists of 30- 100 mol% of terephthalic acid and optionally 0-70 mol% of at least one dicarboxylic acid other than terephthalic acid, and (b) a diamine component which consists of 50-100 mol% of an aliphatic alkylenediamine of 4-25 carbons and optionally 0-50 mol% of at least one alicyclic diamine of 3-25 carbons, said process comprising a first step of performing melt reaction of said dicarboxylic acid with said diamine, thereby giving a low molecular weight condensate having an intrinsic viscosity [?] of 0.05-0.6 dl/g, a second step of subjecting it to solid phase polymerization, thereby giving an aromatic polyamide precursor having an intrinsic viscosity [?] of 0.5-1.0 dl/g, and a third step of subjecting it to melt polymerization, thereby giving an aromatic polyamide having a desired intrinsic viscosity [?] of 0.8-2.5 dl/g. This process permits the industrial production of high molecular weight aromatic polyamides in an economical and efficient manner.

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