Flame-retardant resin composition and molded article for...

C - Chemistry – Metallurgy – 08 – L

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C08L 67/02 (2006.01) C08K 3/00 (2006.01) C08K 3/22 (2006.01) C08K 3/26 (2006.01) C08L 63/00 (2006.01) H01B 3/42 (2006.01)

Patent

CA 2026560

A flame-retardant resin composition comprising (A) polybutylene terephthalate, a copolymer comprising at least 60.0% by weight of butylene terephthalate units and/or a thermoplastic polyester blend comprising at least 60.0% by weight of polybutylene terephthalate, (B) 2.0 to 25.0% by weight, based on the total composition, of a brominated epoxy resin type flame retardant and/or a brominated polycarbonate type flame retardant, (C) 2.0 to 15.0% by weight, based on the total composition, of a flame retardant assistant composed mainly of antimony trioxide and/or antimony pentoxide, (D) 0.01 to 10.0% by weight, based on the total composition, of a hydrous basic carbonate compound of magnesium and aluminum, and (E) 0 to 70.0% by weight, based on the total composition, of an inorganic filler. This resin composition has an excellent flame retardancy, balanced performances, and an improved molding processability (flowability, molding cycle, mold-staining resistance and the like), and a staining of metals or a formation of decomposition products and volatile substances is controlled when the composition is used for molding electrical parts.

Composition pour résine ignifugeante renfermant : A) du poly(téréphtalate de butylène), copolymère comprenant au moins 60,0 % en poids d'unités de téréphtalate de butylène et (ou) un mélange de polyesters thermoplastiques constitué d'au moins 60,0 % en poids de poly(téréphtalate de butylène); B) 2,0 à 25,0 % en poids, pourcentage basé sur la composition totale, d'un ignifugeant de type résine époxyde bromé et (ou) d'un ignifugeant de type polycarbonate bromé; C) 2,0 à 15,0 % en poids, pourcentage basé sur la composition totale, d'un auxiliaire ignifugeant composé principalement de trioxyde d'antimoine et (ou) de pentoxyde d'antimoine; D) 0,01 à 10,0 % en poids, pourcentage basé sur la composition totale, d'un carbonate basique hydraté de magnésium et d'aluminium; E) 0 à 70,0 % en poids, pourcentage basé sur la composition totale, d'une charge minérale. Cette composition pour résine possède les propriétés suivantes : excellentes qualités d'ininflammabilité; rendements bien équilibrés; tenue améliorée au moulage (écoulement, cycle de moulage, résistance contre les taches, etc.); la coloration des métaux et la formation de produits de décomposition et de substances volatiles sont bien maîtrisées lorsque la composition sert à mouler des pièces électriques.

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