Dsm IP Assets B.v.

Athanasios D Porfyris

Rudy Rulkens

Renier Henricus Maria Kierkels

Eric Grolman

Geert Adelina Rudolf Vanden Poel

Theo Joseph Cuypers

Constantine D Papaspyrides

Geert Adelina Rudolf Poel Vanden

The invention relates to a process for the preparation of semi-crystalline semi-aromatic polyamide by direct solid-state polymerization of a diamine-dicarboxylic acid salt, comprising steps of (a) providing at least two salts of terephthalic acid and diamine, wherein each of these diamine/terephthalic acid salts is in solid state and has a melting temperature of at least Tx, wherein Tx is at least 260&#xb0; C.; (b) preparing a mixture of the diamine/terephthalic acid salts, while retaining the salts in solid state; and (c) heating the mixture obtained from step (b) in the solid state to a temperature (T-c) in the range from 200&#xb0; C. to 260&#xb0; C., under a pressure below the saturation vapor pressure of water at said temperature, thereby condensing and polymerizing the salts and forming a semi-crystalline semi-aromatic polyamide in solid form.

Process for producing a semi-aromatic semi-crystalline polyamide

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Athanasios D Porfyris