Composition of a blend of polyamide and polyester resins

Abstract

A resin blend composition of a polyamide resin and a polyester resin is described, which includes a polyamide resin, a polyester resin and an epoxy resin. The resin blend composition can have improved compatibility between the polyamide resin and the thermoplastic polyester resin, and therefore mechanical properties (strength, bending strength, elasticity, abrasion resistance, impact strength), chemical properties (solvent resistance), thermal resistance, dimensional stability, and paintability.

1 . A resin blend composition of a polyamide resin and of a polyester resin, the composition comprising:
 a) from 1 wt. % to 98 wt. % of a thermoplastic polyamide resin;   b) from 1 wt. % to 98 wt. % of a thermoplastic polyester resin; and   c) from 0.01 wt. % to 10 wt. % of an epoxy resin having an epoxy equivalent weight (EEW) between 2100 g/eq and 6000 g/eq.   
     
     
         2 . The composition as claimed in  claim 1 , wherein said epoxy resin comprises one or more elements selected from the group consisting of a diglycidyl ether of bisphenol A (DGEBA) epoxy resin, a diglycidyl ether of bisphenol A (DGEBF) epoxy resin, a bisphenol A (BPA) epoxy resin, a brominated epoxy resin, a cycloaliphatic epoxy resin, an epoxy resin of modified rubber, an epoxy resin of the aliphatic polyglycidyl type and an epoxy resin of the glycidyl amine type. 
     
     
         3 . The composition as claimed in  claim 1 , wherein the epoxy equivalent weight of said epoxy resin varies from 2500 g/eq to 6000 g/eq. 
     
     
         4 . The composition as claimed in  claim 1 , wherein said composition comprises from 0.05 wt. % to 7 wt. % of said epoxy resin. 
     
     
         5 . The composition as claimed in  claim 1 , wherein said polyamide resin comprises one or more elements selected from the group consisting of polyamide-6, polyamide-66, polyamide-610, polyamide-11 polyamide-12, polyterephthalamide, polyisophthalamide, and polyaramids. 
     
     
         6 . The composition as claimed in  claim 1 , wherein said polyester resin comprises one or more elements selected from the group consisting of polybutylene terephthalate, polybutylene (terephthalate/isophthalate), polybutylene (terephthalate/adipate), polybutylene (terephthalate/sebacate), polybutylene (terephthalate/decanedicarboxylate), polybutylene naphthalate, polyethylene terephthalate, polyethylene (terephthalate/isophthalate), polyethylene (terephthalate/adipate), polyethylene (terephthalate/5-sodium sulfoisophthalate), polybutylene (terephthalate/5-sodium sulfoisophthalate), polypropylene terephthalate, polyethylene naphthalate and polycyclohexanedimethylene terephthalate. 
     
     
         7 . The composition as claimed in  claim 1 , wherein said polyester resin is a recycled resin. 
     
     
         8 . The composition as claimed in  claim 1 , wherein the composition comprises at least one fireproofing agent. 
     
     
         9 . A method of preparing a resin blend composition of a polyamide resin and of a polyester resin the method comprising mixing in the molten state:
 a) from 1 wt. % to 98 wt. % of a thermoplastic polyamide resin;   b) from 1 wt. % to 98 wt. % of a thermoplastic polyester resin; and   c) from 0.01 wt. % to 10 wt. % of an epoxy resin having an epoxy equivalent weight between 2100 g/eq and 6000 g/eq.   
     
     
         10 . A method of improving compatibility of a resin blend composition of a thermoplastic polyamide resin and a thermoplastic polyester resin, the method comprising using an epoxy resin having an epoxy equivalent weight between 2100 g/eq and 6000 g/eq to improve the compatibility of the resin blend composition.