Composition with increased stress cracking resistance

Details Composition with increased stress cracking resistance Composition with increased stress cracking resistance

C - Chemistry, Metallurgy

08

L

C08L 33/08 (2006.01) C08L 25/12 (2006.01) C08L 33/10 (2006.01)

Patent

CA 2689493

The invention relates to a composition containing, in relation to the total weight of said composition, A) between 50.0 % by weight and 99.5 % by weight of at least one (meth)acrylate (co)polymer and B) between 0.5 % by weight and 50.0 % by weight of at least one copolymer, obtained by the polymerisation of a monomer mixture consisting of i. between 70 % by weight and 92 % by weight of a vinyl aromatic monomer and ii. between 8 % by weight and 30 % by weight of acryl nitrile or methacryl nitrile or mixtures thereof iii. between 0 % by weight and 22 % by weight of at least one other monomer, the composition having a haze according to ASTM D1003 at 23°C of less than 2.0 % and a haze according to ASTM D1003 at 40°C of less than 4.0 %, and the composition contains at least one (meth)acrylate (co)polymer a) with a solution viscosity in chloroform at 25°C (ISO 1628 part 6) greater than 55 ml/g. The moulded bodies that can be obtained from the composition are characterised in particular by improved stress cracking resistance and are suitable in particular for use in coatings, paints or films.

La présente invention concerne une composition contenant, respectivement par rapport à son poids total, A) 50,0 à 99,5 % en poids d'au moins un (co)polymère de (méth)acrylate et B) 0,5 à 50,0 % en poids d'au moins un copolymérisat, obtenu par polymérisation d'un mélange de monomères constitué i. de 70 à 92 % en poids d'un monomère de vinyle aromatique ii. de 8 à 30 % en poids d'acrylonitrile ou de méthacrylonitrile ou de mélanges de ceux-ci iii. de 0 à 22 % en poids d'au moins un autre monomère. Cette composition présente à 23°C un trouble qui est inférieur à 2,0 % et à 40°C un trouble qui est inférieur à 4,0 % selon ASTM D1003, et la composition contient au moins un (co)polymère de (méth)acrylate a) présentant une viscosité en solution dans du chloroforme à 25°C (ISO 1628 - section 6) qui est supérieure à 55 ml/g. Les corps moulés obtenus à partir de ladite composition sont caractérisés par une meilleure résistance à la fissuration sous contrainte et conviennent notamment pour des revêtements, des peintures ou des films.

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