Brush filaments prepared from a polytrimethylene terephthalate composition and brushes comprising the same

Abstract

Disclosed herein is a monofilament bristle made of modified polytrimethylene terephthalate (PTT) composition, comprising: (a) 85-95 wt. % of a polytrimethylene terephthalate, and (b) 5-15 wt. % of a polyethylene-alkyl acrylate copolymer, having a flexural modulus of 2500 MPa or lower, a tensile modulus of 2600 MPa or lower, and an elongation at break % of 20% or lower.

1 . A monofilament bristle made of a modified polytrimethylene terephthalate composition, wherein, based on the total weight of the modified polytrimethylene terephthalate composition, the modified polytrimethylene terephthalate composition comprises:
 (a) 85-95 wt. % of at least a polytrimethylene terephthalate, and   (b) 5-15 wt. % of at least a polyethylene-methyl acrylate copolymer;   
       and the modified polytrimethylene terephthalate composition has a flexural modulus of 2500 MPa or lower measured according to ISO178:2001, and a tensile modulus of 2600 MPa or lower, and an elongation at break % of 20% or lower, measured respectively according to ISO527-2:1993. 
     
     
         2 . The monofilament bristle according to  claim 1 , wherein the modified polytrimethylene terephthalate composition is a single phase composition formed by at least a polytrimethylene terephthalate and at least a polyethylene-alkyl acrylate copolymer. 
     
     
         3 . The monofilament bristle according to  claim 1 , wherein the modified polytrimethylene terephthalate composition has a flexural modulus of 2000-2500 MPa, a tensile modulus of 2000-2600 MPa, and an elongation at break % of 4-15%. 
     
     
         4 . The monofilament bristle according to  claim 1  wherein, based on the total weight of the modified polytrimethylene terephthalate composition, at least a polytrimethylene terephthalate is present in an amount of 86-92 wt. %, and at least a polyethylene-alkyl acrylate copolymer are 8-14 wt. %. 
     
     
         5 . The monofilament bristle according to  claim 1  wherein, based on the total weight of the modified polytrimethylene terephthalate composition, at least a polytrimethylene terephthalate is present in an amount of 87-89 wt. %, and at least a polyethylene-alkyl acrylate copolymer are 11-13 wt. %. 
     
     
         6 . The monofilament bristle according to  claim 1 , wherein at least a polyethylene-alkyl acrylate copolymer is selected from one or more polyethylene-alkyl (C 1-10 ) acrylate copolymers. 
     
     
         7 . The monofilament bristle according to  claim 6 , wherein the at least a polyethylene-alkyl acrylate copolymer is selected from polyethylene-methyl acrylate copolymer, polyethylene-ethyl acrylate copolymer, polyethylene-propyl acrylate copolymer, polyethylene-butyl acrylate copolymer, or one or more combinations thereof. 
     
     
         8 . The monofilament bristle according to  claim 7 , wherein at least a polyethylene-alkyl acrylate copolymer is selected from polyethylene-methyl acrylate copolymer. 
     
     
         9 . The monofilament bristle according to  claim 1 , wherein at least a polytrimethylene terephthalate has an intrinsic viscosity of 0.8-1.7 dl/g, or preferably 0.9-1.4 dl/g. 
     
     
         10 . The brush comprising the monofilament bristles according to  claim 1 . 
     
     
         11 . The brush according to  claim 10 , wherein the brush is selected from a toothbrush, paint brush, cosmetic brush or industrial brush. 
     
     
         12 . The brush according to  claim 11 , wherein the brush is a toothbrush.