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US 6,649,117 B1Granted
Thermoplastic molding materials
AssigneeBASF SE
InventorsNorbert Güntherberg, Gerhard Lindenschmidt, Norbert Niessner
Life of this patent
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Abstract
The present invention relates to thermoplastic molding compositions based on ASA (acrylonitrile-styrene-acrylate) with improved flowability and improved extrusion properties. The invention further relates to a process for preparing these thermoplastic molding compositions, their use and also, produced therefrom, reduced-gloss and antistatic films and moldings, and coatings with reduced gloss, and the use of these.
Claims7
A method for coating sheets to give sheets with a reduced-gloss surface and antistatic properties comprising the step of coextruding thermoplastic molding compositions comprising
- (A) from 20 to 99% by weight of at least one graft copolymer, obtainable from
- (a1) from 30 to 90% by weight of a core, obtainable by polymerizing a monomer mixture, consisting essentially of
- (a11) from 80 to 99.99% by weight of at least one C1-C10-alkyl acrylate,
- (a12) from 0.01 to 20% by weight of at least one copolymerizable, polyfunctional, crosslinking monomer, and
- (a13) from 0 to 40% by weight, based on the total weight of components (a11) and (a12), of at least one other copolymerizable, monoethylenically unsaturated monomer, and
- (a2) from 10 to 70% by weight of a graft shell, obtainable by polymerizing a monomer mixture in the presence of the core (a1), and consisting essentially of
- (a21) from 50 to 100% by weight of at least one styrene compound of the formula (I)
- where R1 and R2, independently of one another, are hydrogen or C1-C8-alkyl and/or of a C1-C8-alkyl (meth)acrylate, and
- (a22) from 0 to 50% by weight of at least one monofunctional comonomer, and
- (B) from 1 to 80% by weight of a copolymer obtainable from at least one alpha-olefin and from at least one polar comonomer, with the proviso that the monomers used are not vinyl acetate or any vinylaromatic monomer, and
- (C) from 5 to 60% by weight of a thermoplastic polymer, obtainable by polymerizing a monomer mixture, consisting essentially of
- (c1) from 50 to 100% by weight of at least one vinylaromatic monomer and/or of a C1-C8-alkyl (meth)acrylate, and
- (c2) from 0 to 50% by weight of at least one monofunctional comonomer, and
- (D) from 0.1 to 15% by weight of a three-block polymer made from
- (d1) from 5 to 90% by weight polyethylene oxide and
- (d2) from 95 to 10% by weight polypropylene oxide
- and having a central polypropylene oxide block with a number average molar mass Mn of from 800 to 5000 g/mol and terminal blocks made from polyethylene oxide,
- where total components A to D give 100% by weight in total.
15 more elements
Dependencies are inferred from the claim text.