Anionic polymerization of caprolactam at a temperature below the

Details Anionic polymerization of caprolactam at a temperature below the Anionic polymerization of caprolactam at a temperature below the

1976-07-01

1978-08-08

Anderson, Harold D.

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

Synthetic resins

From carboxylic acid or derivative thereof

528315, 528323, 528317, 528319, C08G 6918

Patent

active

041056442

ABSTRACT:
The invention relates to a method for manufacturing of anionic polycaprolactam with a low content of water extractables and high stability of the degree of polymerization during melting by a two-stage polymerization using known basic initiators and known activators of the following types: ##STR1## where R is ##STR2## R.sup.1 = R or C.sub.1-4 alkyl, cycloalkyl or allyl, R.sup.2 = C.sub.1-4 alkyl or H atom, n is an integer 3-11 and x is an integer >3. The ratio of activator to initiator (e.g. sodium dihydromethoxyethoxyaluminate) ranges between 2.6 and 4.2, advantageously 2.8-3.5 The first polymerization stage proceeds at 150.degree.-200.degree. C. for .ltoreq.10 min, the polymer is then shaped and postpolymerized at 150.degree.-200.degree. C. for .ltoreq.90 min to achieve a monomer content near to the equilibrium content corresponding to the 2nd stage temperature.

REFERENCES:
patent: 3488326 (1970-01-01), Van Beveren et al.
patent: 3804813 (1974-04-01), Takamiya et al.

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