Aliphatic polyester

Abstract

The present invention provides a copolymer obtainable by condensation of i) 90 to 99.5 mol %, based on components i to ii, of succinic acid; ii) 0.5 to 10 mol %, based on components i to ii, of one or more C 2 -C 8 dicarboxylic acids; iii) 100 mol %, based on components i to ii, of 1,3-propanediol or 1,4-butanediol, and having a DIN 53728 viscosity number in the range from 100 to 450 mL/g. The invention further provides a process for producing the copolymers, polymer blends comprising these copolymers and also for the use of these copolymers.

1 .- 10 . (canceled) 
     
     
         11 . A copolymer obtained by condensation of:
 i) 90 to 99.5 mol %, based on components i to ii, of succinic acid;   ii) 0.5 to 10 mol %, based on components i to ii, of azelaic acid, sebacic acid and/or brassylic acid;   iii) 98 to 102 mol %, based on components i to ii, of 1,3-propanediol or 1,4-butanediol, and   iv) 0.01% to 5% by weight, based on the total weight of said components i to ii, of a chain extender and/or crosslinker selected from the group consisting of a polyfunctional isocyanate, isocyanurate, oxazoline, carboxylic anhydride, epoxide (in particular an epoxy-containing poly(meth)acrylate), and/or an at least trihydric alcohol or an at least tribasic carboxylic acid.   
     
     
         12 . The copolymer according to  claim 11  further comprising:
 v) 1% to 80% by weight, based on the total weight of said components i to iv, of an organic filler selected from the group consisting of native or plasticized starch, natural fibers, wood meal, comminuted cork, ground bark, nut shells, ground presscakes (vegetable oil refining), dried production residues from the fermentation or distillation of beverages such as, for example, beer, brewed lemonades, wine or sake and/or an inorganic filler selected from the group consisting of chalk, graphite, gypsum, conductivity carbon black, iron oxide, calcium chloride, dolomite, kaolin, silicon dioxide (quartz), sodium carbonate, titanium dioxide, silicate, wollastonite, mica, montmorillonites, talcum, glass fibers and mineral fibers. 
 
     
     
         13 . The copolymer according to  claim 11  further comprising:
 vi) 0.1% to 2% by weight, based on the total weight of said components i to iv, of at least one stabilizer, nucleating agent, neutralizing agent, lubricating and release agent, surfactant, wax, antistat, antifog agent, dye, UV absorber, UV stabilizer or other plastic additive. 
 
     
     
         14 . The copolymer according to  claim 11  further comprising:
 (vii) 0.1% to 10% by weight, based on the total weight of said components i to iv, of at least one plasticizer. 
 
     
     
         15 . A copolymer blend comprising:
 5% to 95% by weight of a copolymer according to  claim 11  and   95% to 5% by weight of a polymer selected from the group consisting of polylactic acid, polycaprolactone, polyhydroxyalkanoate, aliphatic polycarbonate, chitosan, gluten and an aliphatic polyester such as polybutylene succinate or polybutylene succinate adipate,   0% to 2% by weight of a compatibilizer.   
     
     
         16 . The process for producing copolymers according to  claim 11  by condensation of said components i) to iii) to form a prepolyester having a viscosity number (VN) of 50 to 100 mL/g and subsequent chain extension with diisocyanates or with epoxy-containing poly(meth)acrylates to form a polyester having a viscosity number of 100 to 450 mL/g. 
     
     
         17 . A method of producing adhesives, dispersions and moldings, extruded foams, bead foams, nets and self-supporting film/sheet comprising utilizing the copolymers according to  claim 11 . 
     
     
         18 . A method of producing injection moldings comprising utilizing the copolymers according to  claim 11 . 
     
     
         19 . A method of producing extrusion-blown or injection stretch blown moldings comprising utilizing the copolymers according to  claim 11 .