Polyacetal resin composition and molded article thereof

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 59/00 (2006.01) C08L 23/08 (2006.01) C08L 25/08 (2006.01) C08L 51/06 (2006.01) C08L 83/04 (2006.01) G01N 3/00 (2006.01) G01N 19/02 (2006.01)

Patent

CA 2215168

An objective of the invention is to provide a polyacetal resin composition which has excellent resistance to heat aging and grease resistance, has welded sections with no decrease in physical properties, and has improved friction characteristics, and molded articles therefrom. A polyacetal resin composition comprising per 100 parts by weight of a polyacetal resin, 2-7 parts by weight of a polymer composition based on an olefinic polymer having glycidyl-group- containing pendant chains and 0.5-2.5 parts by weight of a dimethyl siloxane polymer of a plasticity of at least one; a polyacetal resin composition further comprising 100 parts by weight of the preceding resin composition along with 0.05-0.5 parts by weight of carbon black; and molded articles therefrom.

L'invention concerne une composition de résine polyacétal qui a une excellente résistance au vieillissement à chaud et aux graisses et dont les soudures ne provoquent pas un affaiblissement des propriétés physiques. Cette résine a également des caractéristiques améliorées de friction. L'invention concerne également des articles formés par moulage à partir de cette composition. La composition de résine polyacétal contient pour 100 parties en poids de résine polyacétal: 2-7 parties en poids d'une composition polymère basée sur un polymère oléfinique ayant des groupes pendants contenant des groupes glycidyle et 0,5-2,5 parties en poids de polymère diméthyle siloxane ayant une plasticité d'au moins 1. La composition de résine polyacétal contient en outre pour 100 parties en poids, 0,05-0,5 parties de noir de carbone. L'invention concerne également des articles formés par moulage à partir de cette composition.

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