Copolymerization of 1,4-dioxan-2-one and a cyclic ester...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof

Reexamination Certificate

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C521S182000, C521S916000, C524S306000, C524S310000, C525S306000, C525S310000, C525S437000, C528S182000, C528S188000, C528S354000, C549S274000, C549S349000

Reexamination Certificate

active

11199536

ABSTRACT:
A polymerization process to derive a thermal-stabilized poly(1,4-dioxan-2-one) and cyclic ester monomer copolymer using a coordination-insertion catalyst/initiator. 1,4-dioxan-2-one and cyclic ester monomer, each containing less than 100-ppm water and having an acid value less than 0.5 mg KOH/g, and preferably less than 0.2 mg KOH/g, are copolymerized. Preferably the cyclic ester monomer is ε-caprolactone and the reaction is in an extruder.

REFERENCES:
patent: 5556895 (1996-09-01), Lipinsky et al.

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