C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 67/02 (2006.01) C08L 33/14 (2006.01) C08L 35/00 (2006.01)
Patent
CA 2325784
The invention concerns thermoplastic polyesters comprising a thermoplastic polyester and an impact modifier. The impact modifier comprises a core-shell copolymer (A), including an elastomer core and at least one thermoplastic shell, and an ethylene copolymer (B) selected among ethylene copolymers (B1), alkyl (meth)acrylate and an unsaturated carboxylic acid anhydride, ethylene copolymers (B2) and an unsaturated epoxy compound and a mixture of copolymers (B1) and (B2). The (B)/(A) ratio is between 25/75 and 10/90 for the weight proportions of the impact modifiers between 18% and 40% in respectively 82% to 60% polyester. It is particularly useful for polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), for obtaining improved shock-proof properties, in particular for resistance at low temperatures.
La présente invention concerne des polyesters thermoplastiques comprenant, en poids: (i) un polyester thermoplastique, (ii) un modifiant choc comprenant: (a) un copolymère (A) coeur - écorce, (b) un copolymère (B) de l'éthylène choisi parmi les copolymères (B1) de l'éthylène et d'un anhydride d'acide carboxylique insaturé, les copolymères (B2) de l'éthylène et d'un époxyde insaturé et leurs mélanges, (iii) le rapport (B)/(A) étant compris entre 90/10 et 25/75 pour des proportions de modifiant choc entre 2 et 40% dans respectivement 98 à 60% de polyester, (iv) le rapport (B)/(A) étant compris entre 25/75 et 10/90 pour des proportions de modifiant choc entre 18 et 40% dans respectivement 82 à 60% de polyester. Elle est particulièrement utile pour le PET et le PBT, pour obtenir des propriétés chocs améliorées notamment, la résilience à basse température.
Bouilloux Alain
Lacroix Christophe
Arkema
Atofina
Robic
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