STABILIZED POLYOXYMETHYLENE FORMING COMPOSITION

Japanese Patent JPS6084348

A

1419040 Oxymethylene polymer composition HOECHST AG 8 Jan 1974 [12 Jan 1973] 00801/74 Addition to 1321184 Heading C3P An oxymethylene polymer composition is stabilized by (a) 0À05 to 4% of a compound of formula where R 1 is an alkyl radical, R 2 is hydrogen or R 1 , A is a bito hexavalent aliphatic hydrocarbon radical, m is 0 to 6, and n corresponds to the valence of A, (b) 0À01 to 3% of an Mg, Ca, Sr or Ba salt of an aliphatic mono-, di- or tricarboxylic acid having 2 to 9 carbon atoms, or of an araliphatic or aromatic carboxylic acid having from 7 to 9 carbon atoms, and optionally (c) 0À01 to 1% of a compound of formula where R is hydrogen, cyano, hydrocarbyl or hydroxyhydrocarbyl. Other stabilizers may also be included such as amides, polyamides, poly N-vinyl lactams, ureas instead of (c), or light stabilizers, fillers, pigments, dyestuffs or reinforcements. Examples refer to the stabilization of an acetylated formaldehyde homopolymer or a copolymer of trioxan (98%) and ethylene oxide (2%) with (a) tetrakis[beta-(3,5-di-tbutyl - 4 - hydroxyphenyl) - propionyloxymethyl]methane or 1,6 - bis - [beta - (3,5 - dit - butyl - 4 - hydroxyphenyl) - propionyloxy]- hexane, (b) calcium lactate or the magnesium salts of acetic, propionic, caproic, pelargonic, lactic, malic, hydroxy-pivalic, malonic, adipic, salicylic, cinnamic and mandelic acids, and (c) in one case with cyanoguanidine also, and the production of valve discs and plates from the compositions by injection moulding described.

ERUNSUTO UORUTERUSU
HAINTSU SHIYUMITSUTO
KARURUHAINTSU BURUKU
GIYUNTERU ZEKUSUTORO

JP17855084A

May 13, 1985

August 29, 1984

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HOECHST AG

C08K5/00; C08K5/09; C08K5/098; C08K5/13; C08K5/29; C08L59/00; C08L59/02; C08L77/00; (IPC1-7): C08K5/00; C08K5/09; C08K5/13; C08K5/29; C08L59/00

Ezaki Mitsuyoshi

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