C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 4/00 (2006.01) C08G 2/10 (2006.01)
Patent
CA 2126134
Abstract To provide a process for preparing at high efficiency a polyoxymethylene terpolymer having a high degree of polymerization which is improved in heat stability. In the process for the preparation of a polyoxy- methylene terpolymer having a high degree of polymerization which comprises copolymerizing trioxane as a principal monomer with a cyclic ether or cylcic formal as a comonomer and a polyfunctional glycidyl compound having at least two epoxy groups in its molecule as a third component in the presence of boron trifluoride or a coordination compound thereof as a catalyst, the total amount of the impurities causative of the formation of unstable ends contained in the reaction system is regulated to 1 x 10-2 mole % or below based on the whole amount of the monomers; the catalyst for the copolymerization is used in an amount of 1 x 10-3 to 1 x 10--2 mole % based on the whole amount of the monomers; and the copolymerization is followed by the cooling of the product to a temperature of 45°C or below within 30 seconds to deactivate the catalyst.
Kamiya Makoto
Maeda Nagayoshi
Murao Toshiro
Yamamoto Kaoru
Polyplastics Co. Ltd.
Smart & Biggar
LandOfFree
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