Polycarbonate polyester molding composition
View Patent ↗A thermoplastic blend suitable for blow molding comprising a branched polycarbonate and a polyester resin derived from the condensation of a) a cyclohexanedimethanol or equivalent thereof alone or with an ethylene glycol or equivalent thereof, b) together with a terephthalic acid or equivalents thereof alone or with an isophthalic acid or equivalent thereof.
1. A composition comprising a thermoplastic resin blend suitable for blow molding comprising:
(a) from about 50 to about 80 percent by weight, based on the total weight of the blend, of a branched polycarbonate, and
(b) from about 20 to about 50 weight percent, based on the total weight, of a polyester resin derived from the condensation of a) a cyclohexanedimethanol or equivalent thereof alone or with an ethylene glycol or equivalent thereof, b) together with a terephthalic acid or equivalents thereof alone or with an isophthalic acid or equivalent thereof; and
(c) a styrene-acrylic copolymer with multiple epoxy groups.
2. The composition of claim 1 , wherein the polycarbonate and polyester are present in proportions to form a clear blend having a transmission of seventy percent or greater and a % retention of tensile elongation at break of 2% or more after exposure to at least one detergent or other oily material(s).
3. The composition of claim 1 wherein desirable enhanced chemical resistance is provided to the blend by the addition of above 0 to about 1.0 weight % of the styrene-acrylic copolymer with multiple epoxy groups.
4. The composition of claim 1 , wherein the polycarbonate has a MFR (Melt Flow Rate; 300 C, 1.2 Kg, 6 min) of about 1.3 to about 2 g/10 min.
5. The composition of claim 3 wherein there is about 0.05 to about 1.0 weight % of the styrene-acrylic copolymer with multiple epoxy groups.
6. The composition of claim 1 comprising the optional presence of linear polycarbonate in an amount less than about 25 percent by weight of the total weight of the composition.
7. A shaped article molded from the blend of claim 1 .
8. A shaped article molded from the blend of claim 4 .
9. A container extrusion blow-molded from the blend of claim 1 .
10. A container extrusion blow-molded from the blend of claim 4 .
11. The composition of claim 1 , wherein the composition contains the polycarbonate in an amount ranging from about 56 to 80 weight % and the polyester is present in an amount ranging from about 20 to 44 weight %.
12. A composition comprising a thermoplastic resin blend suitable for blow molding comprising:
(a) from about 56 to about 80 percent by weight, based on the total weight of the blend, of a branched polycarbonate having an MFR (Melt Flow Rate; 300 C, 1.2 Kg, 6 min) of from about 1 to about 2 g/10 min;
(b) from about 20 to about 44 weight percent, based on the total weight of the blend, of a polyester resin derived from the condensation of a) a cyclohexanedimethanol or equivalent thereof alone or with an ethylene glycol or equivalent thereof, b) together with a terephthalic acid or equivalents thereof alone or with an isophthalic acid or equivalent thereof; and
(c) above 0 about 1 wt % of a chemically enhancing amount of a styrene-acrylic copolymer having multiple epoxy groups, based on the total weight of the blend.
13. The composition of claim 12 , wherein the polycarbonate and polyester are present in proportions to form a clear blend having a transmission of seventy percent or greater and a % retention of tensile elongation at break of 2% or more after exposure to at least one detergent or other oily material(s).
14. The composition of claim 12 wherein desirable enhanced chemical resistance is provided to the blend by the addition of above 0 to about 1.0 weight % of the styrene-acrylic copolymer with multiple epoxy groups.
15. The composition of claim 12 , wherein the polycarbonate has a MFR (Melt Flow Rate; 300 C, 1.2 Kg, 6 min) of about 1.3 to about 2 g/10min.
16. The composition of claim 12 wherein there is about 0.05 to about 1.0 weight % of the styrene-acrylic copolymer with multiple epoxy groups.
17. The composition of claim 12 comprising the optional presence of linear polycarbonate in an amount less than about 25 percent by weight of the total weight of the composition.
18. A shaped article molded from the blend of claim 12 .
19. A shaped article molded from the blend of claim 15 .
20. A container extrusion blow-molded from the blend of claim 12 .
21. A container extrusion blow-molded from the blend of claim 15 .