Hydrolytic polymerization of epsilon-caprolactam

Details Hydrolytic polymerization of epsilon-caprolactam Hydrolytic polymerization of epsilon-caprolactam

1979-02-12

1980-05-20

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymerizing in two or more physically distinct zones

528323, 528318, C08G 6916

Patent

active

042040493

ABSTRACT:
An improved process for the continuous polymerization of .epsilon.-caprolactam in the presence of water as initiator in a vertical downward-flow tubular reactor, in which the .epsilon.-caprolactam is partially polymerized at elevated temperature in a first, mechanically agitated reaction zone and is further polymerized in further reaction zones to the desired degree of polymerization. Poly-.epsilon.-caprolactam is discharged in the form of a melt. The polymerization is carried out at a gauge pressure of from 0.2 to 0.9 bar, constant in all reaction zones. The temperature in the first reaction zone is maintained according to the relationship t.ltoreq.265+43 p .degree.C., where p is the numerical value of the gauge pressure in bars which relationship is subject to the condition that the temperature be within the range of 260.degree. to 295.degree. C.

REFERENCES:
patent: 2241323 (1941-05-01), Greenewalt
patent: 3044993 (1962-07-01), Tiemersma

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