Mineral-reinforced co-polyester blend
The invention relates to a composition containing A) 60 to 80 wt. % of a polyester on the basis of terephthalic acid and at least one dianhydrohexitol and optionally additional diols, B) 10 to 30 wt. % of a polyester on the basis of succinic acid and at least one aliphatic, araliphatic or cycloaliphatic diol, and C) 3 to 12 wt. % of at least one mineral reinforcing material on the basis of talcum. The invention also relates to a method for producing a molding compound from the composition, to the molding compound itself and to moldings obtainable from the composition or the molding compound.
1. A composition containing:
A) 60% to 80% by weight of a polyester based on terephthalic acid and at least one dianhydrohexitol and a mixture of isosorbide, cyclohexanedimethanol and 7% by weight of ethylene glycol, wherein component A has a weight-average molecular weight Mw measured by gel permeation chromatography in 1,1,1,3,3,3-hexafluoro-2-propanol using a polyethylene terephthalate standard of 10 to 100 kg/mol,
B) 10% to 30% by weight of a polyester based on succinic acid and at least one aliphatic, araliphatic or cycloaliphatic diol,
C) 3% to 12% by weight of at least one mineral reinforcer based on talc.
2. The composition as claimed in claim 1 , wherein component B is a polyester based on succinic acid and butanediol.
3. The composition as claimed in claim 1 , wherein component B has a melt volume flow rate of 5 to 20 cm 3 /10 min measured according to ISO 1133 in the 2012 version at 240° C. and a loading of 5 kg.
4. The composition as claimed in claim 1 , wherein component A contains structural units derived from isosorbide which is produced from renewable raw materials.
5. The composition as claimed in claim 1 , wherein component C is talc having a median particle size d 50 of 0.8 to 2.0 μm.
6. The composition as claimed in claim 1 , containing
65% to 72% by weight of component A,
18% to 28% by weight of component B and
4% to 10% by weight of component C.
7. The composition as claimed in claim 1 further containing as component D 0.1% to 10% by weight of at least one polymer additive selected from the group consisting of flame retardants, anti-drip agents, flame retardant synergists, smoke inhibitors, lubricants and demolding agents, nucleating agents, antistats, conductivity additives, stabilizers, flow promoters, phase compatibilizers, impact modifiers, dyes, and pigments.
8. The composition as claimed in claim 1 consisting of components A to C.
9. A process for producing a molding compound, wherein the constituents of a composition as claimed in claim 1 are mixed with one another at a temperature of 200° C. to 320° C.
10. A molding compound obtained by the process as claimed in claim 9 .
11. A molded article obtained from the composition as claimed in claim 1 .