Thermoplastic resin composition for 3d printer

Abstract

Disclosed are a composition for 3D printer filaments satisfying requirements as a 3D printing material and a filament for a 3D printer manufactured using the same. A composition for 3D printer filaments including a polymer base containing atactic polypropylene having a weight average molecular weight of 50,000 to 1,000,000, a density of 0.8 to 0.9 g/ml, and isotacticity (Pentad I.I, mmmm) of 5 to 20%. The melting index (210° C., 2.16 kg) of the polymer base is 0.5-30 g/10 minutes, and a filament for a 3D printer manufactured using the same are provided.

What is claimed is: 
     
         1 . A composition for three-dimensional (3D) printer filaments, comprising a polymer base including atactic polypropylene having a weight average molecular weight of 50,000 to 1,000,000, a density of 0.8 to 0.9 g/ml, and isotacticity (Pentad I.I, mmmm) of 5 to 20%, wherein melting index (210° C., 2.16 kg) of the polymer base is 0.5-30 g/10 minutes. 
     
     
         2 . The composition for 3D printer filaments of  claim 1 , wherein the atactic polypropylene is polymerized in the presence of a catalyst including a transition metal compound represented by the following Formula 1: 
       
         
           
           
               
               
           
         
         where M is a transition metal in group 4, 
         Q 1  and Q 2  are each independently halogen; (C 1 -C 20 )alkyl; (C 2 -C 20 )alkenyl; (C 2 -C 20 )alkynyl; (C 6 -C 20 )aryl; (C 1 -C 20 )alkyl(C 6 -C 20 )aryl; (C 6 -C 20 )aryl(C 1 -C 20 )alkyl; (C 1 -C 20 )alkylamido; (C 6 -C 20 )arylamido; or (C 1 -C 20 )alkylidene, 
         R 1  to R 10  are each independently hydrogen; (C 1 -C 20 )alkyl including or not including acetal, ketal or an ether group; (C 2 -C 20 )alkenyl including or not including acetal, ketal or an ether group; (C 1 -C 20 )alkyl(C 6 -C 20 )aryl including or not including acetal, ketal or an ether group; (C 6 -C 20 )aryl(C 1 -C 20 )alkyl including or not including acetal, ketal or an ether group; or (C 1 -C 20 )silyl including or not including acetal, ketal or an ether group, where R 1  and R 2  may be connected to each other to form a ring, and at least two of R 6  to R 10  may be connected to each other to form a ring, 
         R 3  and R 4  are each independently hydrogen or methyl, where at least one of R 3  and R 4  is methyl, 
         R 5  is (C 1 -C 20 )alkyl including or not including acetal, ketal or an ether group, 
         R 11 , R 12  and R 13  are each independently hydrogen; (C 1 -C 20 )alkyl including or not including acetal, ketal or an ether group; (C 2 -C 20 )alkenyl including or not including acetal, ketal or an ether group; (C 1 -C 20 )alkyl(C 6 -C 20 )aryl including or not including acetal, ketal or an ether group; (C 6 -C 20 )aryl(C 1 -C 20 )alkyl including or not including acetal, ketal or an ether group; (C 1 -C 20 )silyl including or not including acetal, ketal or an ether group; (C 1 -C 20 )alkoxy; or (C 6 -C 20 )aryloxy, where R 11  and R 12 , or R 12  and R 13  are connected to each other to form a ring. 
       
     
     
         3 . The composition for 3D printer filaments of  claim 1 , wherein the atactic polypropylene is a homopolymer, or a block copolymer or a random copolymer with at least one olefin selected from the group consisting of ethylene, butene, hexene, octene and styrene. 
     
     
         4 . The composition for 3D printer filaments of  claim 1 , wherein the polymer base further comprises at least one selected from the group consisting of homo polypropylene, a propylene-ethylene block copolymer and random polypropylene having a glass transition temperature of greater than or equal to −5° C. 
     
     
         5 . A filament for a three-dimensional (3D) printer manufactured via extrusion of the composition of  claim 1 .