TH27803C3 - Raw material powder for production Stable polyoxymethylene copolymers and processes for their production A stable polyoxymethylene copolymer using the same substance. - Google Patents

Abstract

DC60 (12/13/43) POM powder coarse copolymer particles as raw materials for the production of POM stable copolymers for practical use are given in terms of advantages. Economical and the process is easy The process for producing stable POM copolymers using coarse POM copolymer powder particles is also revealed. Polyoxymethylene powder particles The coarse copolymer is expelled from the polymerization reactor. It features particle size distribution and surface pore characteristics where (1) components with a particle diameter greater than 1.0 mm are present in quantities up to 50% by weight, mean pore diameter. At the surface of the component is 4 μm or more, the total pore volume with an average diameter of up to 4 μm is up to 50% of the total pore volume at the component surface; And (2) components with a particle diameter of less than 0.18 mm are contained in quantities up to 30% by weight, coarse particle POM copolymer powder as raw material for the production of POM copolymer. Stable performance for practical use is given in terms of economical advantages and an easy process. The process for producing stable POM copolymers using coarse POM copolymer powder particles is also revealed. Polyoxymethylene powder particles The coarse copolymer is expelled from the polymerization reactor. It features particle size distribution and surface pore characteristics where (1) components with a particle diameter greater than 1.0 mm are present in quantities up to 50% by weight, mean pore diameter. At the surface of the component is 4 μm or more, the total pore volume with mean diameter up to -4 μm is up to 50% of the total pore volume at the component surface; And (2) components with a particle diameter of less than 0.18 mm are contained in quantities up to 30% by weight.

Claims (7)

1. Coarse polyoxymethylene copolymer powder particles contain: coarse polyoxymethylene copolymer, which is expelled from the polymerization reactor. Period And crushed into powder To have particle distribution characteristics And the micro pore distribution characteristics at the surface specified in (1) and (2) are as follows; (1) Components with a particle diameter greater than 1.0 mm are contained in amounts of 10 to 50% by weight, (1-a) mean pore diameter at the component surface is 4 μm or more. , (Ib) Total pore volume with mean diameter up to 4 μm is up to 50% of the total pore volume at the component surface; And (2) components with particle diameter less than 0.18 mm are contained in quantities up to 30% by weight. 2. The process for the production of stable polyoxymethylene copolymer, in which the coarse polyoxymethylene copolymer powder particles according to claim 1, are The residual polymerization catalyst is treated-treated for decomposition and then to be treated. A massage treatment fused together with stabilizers 3. The process for producing stable polyoxymethylene copolymer, where the treatment substance For catalytic deterioration, the remaining polymerization is rudely added to the polymethylene copolymer abruptly at the time between pre-excretion of these substances. From the polymerization reactor And before the completion of the treatment with grinding Those substances are powdered, and the treatment is ground into powder. Will be executed Which will produce The coarse polyoxymethylene copolymer particles according to claim 1, after which, the powder particles are treated by fusible kneading with the Stability 4. The process for the production of stable polyoxymethylene copolymer in accordance with one of the claims of 2 and 3, where the volume of molecules is not constant. Of polyoxymethylene copolymer powder particles after treatment for activation Polymerization catalyst at Remaining is 0.1-0.8% by weight. 5. The process for the production of stable polyoxymethylene copolymer in accordance with one of two or three claims, where the polyoxymethylene copolymer Roughly, it was obtained by using an acidic catalyst as a polymerization catalyst. 6. The process for producing stable polyoxymethylene copolymer in accordance with one of the claims 2 and 5, where polyoxymethylene copolymer Crude polymerization was obtained by polymerization. In the presence of a hinder phenolic compounds 7. The process for producing stable polyoxymethylene copolymer in accordance with one of the claims 2 and 6, where the polyoxymethylene copolymer The roughness was obtained by polymerization of raw material monomer with water content up to 10 ppm.