Compositions for the production of objects using additive manufacturing

Abstract

This invention relates to an object comprised of a plurality of fused filaments of a polyester material that includes units of a diacid component and units of a glycol component. The co-polyester has a zero shear viscosity no greater than about 3000, an elongation at break of at least about 75%, a density no greater than about 1.25 g/cm3, a glass transition temperature of at least about 80° C., an inherent viscosity from about 0.55 dL/g to about 0.7 dig, a density no greater than about 1.25 g/cm3, and a crystallization half-time no greater than about 300 minutes.

1 . An article comprising:
 a plurality of layers of a polymeric material that includes units of a diacid component and units of a glycol component, wherein the units of the diacid component are derived from a first diacid and a second diacid.   
     
     
         2 . The article of  claim 1 , wherein the plurality of layers are arranged according to a design. 
     
     
         3 . The article of  claim 1 , wherein the first diacid is terephthalic acid and the second diacid is isophthalic acid, a cyclohexanedicarboxylic acid, a naphthalenedicarboxylic acid, a stilbenedicarboxylic acid, or a combination thereof. 
     
     
         4 . The article of  claim 1 , wherein the diacid component includes from about 40 mole % to about 60 mole % of units derived from the first diacid and from about 40 mole % to about 60 mole % of units derived from the second diacid. 
     
     
         5 . The article of  claim 1 , wherein the diacid component includes from about 45 mole % to about 55 mole % of units derived from terephthalic acid and from about 45 mole % to about 55 mole % of units derived from isophthalic acid. 
     
     
         6 . The article of  claim 1 , wherein the units of the glycol component are derived from cyclohexanedimethanol. 
     
     
         7 . The article of  claim 1 , wherein the glycol component includes from about 75 mole % to about 98 mole % of units derived from a first glycol and from about 2 mole % to about 25 mole % of units derived from one or more second glycols. 
     
     
         8 . The article of  claim 7 , wherein the first glycol includes cyclohexanedimethanol and the one or more second glycols include ethylene glycol, a propanediol, neopentyl glycol, a butanediol, a pentanediol, a hexanediol, p-xylene glycol, or a combination thereof. 
     
     
         9 . The article of  claim 8 , wherein the polymeric material has an inherent viscosity from about 0.55 dL/g to about 0.7 dL/g, a density no greater than about 1.25 g/cm 3 , a glass transition temperature of at least about 80° C., and a crystallization half-time no greater than about 300 minutes. 
     
     
         10 . An article comprised of fused filament polymer layers arranged in a design, said polymer comprising a polyester having an acid component and a glycol component;
 wherein the acid component comprises repeat units from 30 to 70 mole % terephthalic acid and from 70 to 30 mole % of one or more dibasic acids selected from the group consisting of isophthalic acid, 1,3-cyclohexanedicarboxylic acid, 1,4 cyclohexanedicarboxylic acid, 1,4-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, or 2,7-naphthalenedicarboxylic acid, stilbenedicarboxylic acid, sebacic acid, dimethylmalonic acid, succinic acid, or combinations thereof;   wherein the glycol component comprises repeat units from 75 to 98 mole % cyclohexanedimethanol and from 2 to 25 mole % glycols selected from the group consisting of ethylene glycol, 1,2-propanediol, 1,3-propanediol, neopentyl glycol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, p-xylene glycol, 2,2,4,4-tetramethyl-1,3-cyclobutanediol or combinations thereof;   wherein the total mole % of the acid component is 100 mole % and the total mole % of the glycol component in 100 mole %;   wherein the polyester has an inherent viscosity of 0.55 dL/g to 0.7 dL/g, a density no greater than about 1.35 g/cm 3 , a glass transition temperature of 70° C. to 110° C., an elongation at break of at least about 75%, a zero shear viscosity of 1750 to 8000 poise and a crystallization half-time no greater than about 300 minutes.   
     
     
         11 . The article of  claim 10 , wherein the diacid component includes from 45 mole % to 55 mole % of units derived from terephthalic acid and from 45 mole % to 55 mole % of units derived from isophthalic acid. 
     
     
         12 . The article of  claim 10  wherein the acid component further comprises 0.1 mole % to 1.5 mole % of a branching agent selected from the group consisting of trimellitic anhydride, trimellitic acid, pyromellitic dianhydride, trimesic acid, hemimellitic acid, glycerol, trimethylolpropane, pentaerythritol, 1,2,4-butanetriol, 1,2,6-hexanetriol, sorbitol, 1,1,4,4-tetrakis(hydroxymethy)cyclohexane, dipentaerythritol, or combinations thereof.