Patent ID: 8362192
Filing Date: 2013-01-29
Classification: C08G,C08K

Abstract:
1. A method for obtaining an aromatic polyamide crumb from an aromatic diamine and an aromatic diacid chloride, which aromatic polyamide comprises 5(6)-amino-2-(p-aminophenyl)benzimidazole terephthalamide units and has a relative viscosity η rel of at least 3, comprising: adding at least monomers (i)-(iii) in N-methyl pyrrolidone as solvent wherein: mixing the monomers and the optional calcium chloride to a homogeneous mixture having a monomer concentration of 5 to 12 wt %, followed by adding calcium chloride to the homogeneous mixture to obtain a CaCl polymerizing the mixture in a reactor having a measure capacity of at least 160 L, wherein mole % relates to the molar percentage of the monomers with regard to the total of aromatic diamine and aromatic diacid chloride monomers.