Method to prepare nylon 6 prepolymer providing a final...

Details Method to prepare nylon 6 prepolymer providing a final... Method to prepare nylon 6 prepolymer providing a final...

D - Textiles, Paper

01

F

402/229, 18/618

D01F 6/60 (2006.01) C08G 69/16 (2006.01) D01D 1/02 (2006.01)

Patent

CA 1039024

ABSTRACT OF THE DISCLOSURE A coupled process for the production of polycaproamide shaped articles from molten anhydrous nascent polymer is disclosed. The improvement is hydrolyzing to form prepolymer by continuously maintaining a carefully controlled temperature profile, from top to bottom of the hydrolyzer, from a top temperature of 200° to 240°C. and a bottom temperature of 245° to 275°C. with no more than 25° difference between the stages and substantially uniform temperature within each stage by mixing with a high degree of turbulence within each stage to achieve a mixing Reynolds number of from about 250 to 200,000, and achieving plug flow effect along the length of the reactor by baffles between each stage, so that the final product has a water extractables content of less than 3.5 percent and oligomer content of less than 2.5 percent.

193220

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