Polymer mixture for injection mouldings with a matt surface, e.g. exterior vehicle parts, comprises an acrylic matrix, a crosslinked acrylic impact modifier and plastic particles with a specified range of particle sizes

• Main Authors: HOESS, WERNER, KEMPF, PETER, GOLCHERT, URSULA, WICKER, MICHAEL, NAU, STEFAN, SCHULTES, KLAUS, ALBRECHT, KLAUS
• Format: Patent
• Language: English; German
• Published: 12.05.2005
• Edition: 7
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

Polymer mixtures giving injection mouldings with a surface roughness (R z) of at least 0.7 micron and a 60[deg] gloss value of not more than 40 contain an acrylic matrix polymer, a crosslinked acrylic impact modifier and plastic particles (crosslinked acrylic, polystyrene or silicone) with an average particle size of 1-30 microns. Polymer mixtures (I) containing (a) a matrix consisting of (meth)acrylate (co)polymer(s) with a Vicat softening point (VSP; ISO 306-B50) of at least 104[deg]C and/or a (meth)acrylimide (co)polymer, (b) an impact modifier based on crosslinked poly(meth)acrylates and not covalently bonded to (a), and (c) 1-15 wt% plastic particles with an average particle size of 1-30 microns consisting of crosslinked polymers based on polymethyl methacrylate, polystyrene and/or silicone polymer. Injection moulded test pieces made from (I) show a surface roughness (Rz; DIN 4768) of at least 0.7 micron, a 60[deg] gloss value ( DIN 67530) of not more than 40 and a VSP of at least 90[deg]C. Independent claims are also included for (1) a method for the production of injection mouldings from (I) (2) injection mouldings made from (I). Die Erfindung betrifft eine Polymermischung, enthaltend DOLLAR A a) eine Polymermatrix, die aus einem (Meth)acrylat(co)polymeren oder einer Mischung von (Meth)acrylat(co)polymeren mit einer Vicaterweichungstemperatur VET (ISO 306-B50) von mindestens 104 DEG C und/oder einem (Meth)acrylimid(co)poylmeren besteht, DOLLAR A b) ein Schlagzähmodifizierungsmittel auf Basis von vernetzten Poly(meth)acrylaten, welches nicht kovalent an die Polymermatrix a) gebunden ist, DOLLAR A c) 1 bis 15 Gew.-% Kunststoffpartikel aus vernetzten Polymerisaten auf Basis des Polymethylmetharcylats, des Polystyrols und/oder Polysilikonen. DOLLAR A Auf der Polymermischung lassen sich spritzgegossene Formteile mit mattierten Oberflächen und Vicaterweichungstemperaturen VET (ISO 306-B50) von mindestens 90 DEG C erhalten.