Polyplastics Co., Ltd.

Masami Yamawaki

Yukio Ikenaga

Takuzo Kasuga

Yasuyuki Takeda

Takeshi Asano

Koichi Ichimura

Keizo Tanimura

Tsuyoshi Minamisawa

Shuichi Chino

Masaaki Nakamura

Kunio Suzuki

A polyacetal resin composition comprises polyacetal and a two- or more-stage polyacrylate comprising a rubber like first stage and a thermoplastic rigid final stage. It is useful for a metallized article with a high impact resistance.

Polyacetal resin composition

A polyacetal resin composition comprises a polyacetal resin as the matrix, (A) 0.01 to 2.0 percent by weight of a stabilizer selected from a benzotriazole compound, a benzophenone compound and an aromatic benzoate compound and (B) 0.01 to 2.0 percent by weight of a hindered amine compound and is improved in whetherability.

Weather resistant polyacetal resin composition

A solid polymerization product is continuously produced from a liquid stock by employing a continuous agitator-mixer type reactor including two parallel shafts rotatable in same direction or in opposite directions, a multiplicity of paddles mounted on each of the shafts, and a barrel with its inner periphery proximate to the outer peripheries of the paddles, said paddles being arranged so that the major axis end of each paddle on one of the shafts is allowed to periodically come close to the minor axis ends of a corresponding paddle on the other shaft, said reactor being such that feed stock is charged from an inlet port provided at one end of the longitudinal of the reactor and polymerization product is discharged from an outlet port provided at the other end, said method of continuous polymerization being characterized in that the rear-side portion of the reactor including the outlet port is raised so that the major axis of the reactor has a slope angle of 1.degree.-10.degree. relative to the horizontal, whereby reaction is allowed to take place in the reactor as installed in such inclined state.

Method of continuous polymerization

A polyacetal resin composition is provided which has improved antistatic, heat stability and mechanical properties and contains a polyacetal homopolymer or copolymer, carbon black and a nonionic surfactant which is a polypropylene glycol/polyethylene glycol ether copolymer.

The polymer or a copolymer of trioxane copolymer is manufactured by adding 0.001 to 2.0 wt. % of a stereo-hindering phenol to the monomer mixture in advance to the polymerization step and polymerizing trioxane and an optional co-monomer in the presence of a cationic, active catalyst and said phenol.

Method for manufacturing polymer or copolymer of trioxane

A polyacetal composition which comprises polyacetal, an aliphatic ester of a polyhydric alcohol having a hydroxy group, polyethylene glycol, and an organometallic salt, wherein the organometallic salt is present in an amount of from 0.01 to 5 percent by weight based on the total composition.

A trioxane copolymer is manufactured by adding to trioxane and a co-monomer, 0.0001 to 2.0 percent by weight, based on the total weight of the monomers, of one or more sterically hindered phenols, then co-polymerizing the resultant mixture in the presence of a cation-active catalyst, and then treating the resultant copolymer by heating it at a temperature which is higher than the melting point of the copolymer to melt the copolymer and decompose and remove unstable parts of the copolymer.

Growing community of inventors

Fuji, Japan

Masami Yamawaki