Thermoplastic molding compositions

Abstract

Thermoplastic molding compositions essentially comprise (A) from 20 to 99% by weight of at least one graft copolymer, (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 0 to 80% by weight of a thermoplastic polymer, obtainable by polymerizing a monomer mixture, essentially consisting of (c1) from 50 to 100% by weight of at least one vinylaromatic monomer and/or of a C 1 -C 8 -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 of polyethylene oxide and (d2) from 95 to 10% by weight of polypropylene oxide  and having a central polypropylene oxide block with a molar mass of from 800 to 5 000 g/mol and terminal blocks made from polyethylene oxide,  where components A to D give 100% by weight in total. A process for preparing the thermoplastic molding compositions is also described, as is their use.

We claim:  
     
         1 . A thermoplastic molding composition, essentially comprising 
 (A) from 20 to 99% by weight of at least one graft copolymer, essentially obtainable from 
 (a1) from 30 to 90% by weight of a core, obtainable by polymerizing a monomer mixture, essentially consisting of 
 (a11) from 80 to 99.99% by weight of at least one C 1 -C 10 -alkyl acrylate,  
 (a12) from 0.01 to 20% by weight of at least one copolymerizable, poly-functional, 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 essentially consisting of 
 (a21) from 50 to 100% by weight of at least one styrene compound of the formula (I)  
                     
  where R 1  and R 2  independently of one another, are hydrogen or C 1 -C 8 -alkyl and/or of a C 1 -C 8 -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 0 to 80% by weight of a thermoplastic polymer, obtainable by polymerizing a monomer mixture, essentially consisting of 
 (c1) from 50 to 100% by weight of at least one vinylaromatic monomer and/or of a C 1 -C 8 -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 of polyethylene oxide and  
 (d2) from 95 to 10% by weight of polypropylene oxide  
 and having a central polypropylene oxide block with a molar mass of from 800 to 5 000 g/mol and terminal blocks made from polyethylene oxide,  
 where components A to D give 100% by weight in total.  
   
     
     
         2 . A thermoplastic molding composition as claimed in  claim 1 , wherein the particle size of the graft copolymers (A) as given by the average diameter (d 50 ) is from 60 to 1500 nm.  
     
     
         3 . A thermoplastic molding composition as claimed in  claim 2 , wherein the particle size as given by the average diameter (d 50 ) is from 150 to 700 nm.  
     
     
         4 . A thermoplastic molding composition as claimed in any one of  claims 1  to  3 , wherein the particle size distribution of component (A) is bimodal.  
     
     
         5 . A thermoplastic molding composition as claimed in  claim 4 , wherein the component (A) used comprises a mixture of from 0.5 to 99.5% by weight of a graft copolymer (A) whose particle size as given by the average diameter (d 50 ) is from 200 to 1000 nm and from 99.5 to 0.5% by weight of a graft copolymer (A) whose particle size as given by the average diameter (d 50 ) is from 60 to 190 nm.  
     
     
         6 . A thermoplastic molding composition as claimed in any one of  claims 1  to  5 , wherein the glass transition temperature of the core (a1) is selected to be below 0° C.  
     
     
         7 . A process for preparing thermoplastic molding compositions as claimed in any one of  claims 1  to  6  in a manner known per se, which comprises mixing the components of  claim 1  and, if desired, conventional additives in a mixing apparatus.  
     
     
         8 . The use of the thermoplasic molding compositions as claimed in any one of  claims 1  to  6 , or prepared as claimed in  claim 7 , for producing moldings, films or fibers.  
     
     
         9 . The use of the thermoplastic molding compositions as claimed in any one of  claims 1  to  6 , or prepared as claimed in  claim 7 , for coating sheet-like structures to give sheet-like structures with a reduced-gloss surface and antistatic properties, via coextrusion.  
     
     
         10 . A molding, a film or a fiber obtainable by way of the use as claimed in  claim 8 .  
     
     
         11 . A coating or film with leather-like appearance, produced by mixing 
 (A) from 20 to 99% by weight of at least one graft copolymer, essentially obtainable from 
 (a1) from 30 to 90% by weight of a core, obtainable by polymerizing a monomer mixture, essentially consisting of 
 (a11) from 80 to 99.99% by weight of n-butyl acrylate, and  
 (a12) from 0.01 to 20% by weight of tricyclodecenyl acrylate, 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 essentially consisting of 
 (a21) from 60 to 90% by weight of styrene and  
 (a22) from 40 to 10% by weight of acrylonitrile, and  
 
   (B) from 1 to 80% by weight of a copolymer, prepared from 
 from 67 to 96% by weight of ethylene,  
 from 1 to 20% by weight of n-butyl acrylate,  
 from 3 to 10% by weight of (meth)acrylic acid, and  
 from 0 to 3% by weight of maleic anhydride, and  
   (C) from 0 to 80% by weight of a copolymer, prepared by continuous solution polymerization of 
 (c1) from 65 to 85% by weight of styrene and  
 (c2) from 15 to 35% by weight of acrylonitrile, and  
   (D) from 0.1 to 15% by weight of a three-block polymer made from 
 (d1) from 5 to 90% by weight of polyethylene oxide and  
 (d2) from 10 to 95% by weight of polypropylene oxide  
 and having a central polypropylene oxide block with a molar mass of from 800 to 5 000 g/mol and terminal blocks made from polyethylene oxide,  
 where components A to D give 100% by weight in total,  
 and then calendering or extruding to give films.  
   
     
     
         12 . The use of coated sheet-like structures or of films with leather-like appearance as claimed in  claim 11  for the internal fitting-out of houses, utility vehicles, aircraft, ships or trains, or in the furniture industry or in the sanitary sector.