Transparent polyester resins and articles therefrom

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 67/02 (2006.01) C08J 5/18 (2006.01) C08L 77/06 (2006.01) C08K 5/092 (2006.01) C08L 77/00 (2006.01)

Patent

CA 2461911

Compositions suitable for preparing transparent articles comprising an aromatic polyester resin selected from a copolyalkylene terephthalate containing from 3 to 15% by moles of units derived from isophtalic acid and/or a naphtalene dicarboxylic acid and a polyxylylene amide, preferably poly (m.xylylene adipamide), in which the polymide is dispersed in the polyester resin as domains with average numeral size of 30 to 200 nm. The compositions are obtained by premelt-mixing the polyester with a dianhydride of a tetracarboxylic acid prior mixing the polyxylylene amide using melt viscosity ration between the polyester resin and the polyxylylene amide higher that 1.5: 1, preferably from 3:1 to 8:1.

L'invention porte sur des compositions servant à produire des articles transparents composées: d'une résine polyester n aromatique choisie parmi un téréphthalate de copolyalkylène contenant de 3 à 15 % par moles d'unités dérivées de l'acide isophtalique et/ou de l'acide naphtalène dicarboxylique; et d'un polyxylylèneamide de préférence un poly (m.xylylène adipamide) dans laquelle le polyimide est dispersé dans la résine polyester sous forme de domaines d'une taille moyenne de 30 à 200 nm. Ces compositions s'obtiennent en mélangeant le polyester à l'état de préfusion avec un dianhydre de l'acide tétracarboxylique avant de mélanger le polyxylyleneamide, le rapport des viscosités à l'état de fusion entre le polyxylylèneamide et la résine de polyester étant supérieur à 1,5/1, et de préférence compris entre 3:1 et 8:1.

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