PC/TP (polycarbonate / polyester blend) is a thermoplastic alloy of amorphous polycarbonate and semi-crystalline polyester (either polybutylene terephthalate or polyethylene terephthalate) that provides a combination of chemical resistance, temperature resistance, and mechanical strength.
Our polymer compounding technology allows us to prepare alloys of Polycarbonate (PC) and Polyesters (either PBT or PET). Polycarbonate (PC) is used in many applications because PC provides excellent toughness, high rigidity, and good heat resistance. Polycarbonate does have a weakness with resistance to organic chemicals. Polyesters such as PBT and PET have a very high resistance to organic chemicals because they are semi-crystalline. These materials are also rigid, and can hold up to high temperatures. The crystallinity of polyesters causes them to have both high specific gravity and high shrinkage values. Polyesters such as PBT and PET also have very low notched Izod impact values.
With our compounding extruders, Polymer Resources can blend PC and either PBT or PBT into polymer alloys that combine the desirable properties of both PC and the polyester, and that minimize the less desirable properties. These alloys offer the toughness of PC along with the chemical resistance of the polyesters. Chemical resistance can be “fine-tuned” by varying the ration of PC to polyester. Both specific gravity, and shrinkage of these alloys are less than that of polyesters, and greater than that of PC.
The properties of our PC/TP alloys can be further enhanced by the addition of additives during compounding. Impact modifiers can be added to provide products with very good low temperature impact. Flame retardants can be added to provide products with UL 94 V-0 ratings. Glass fibers can be added to provide products with high flex strength. Stabilizers can be added to improve resistance to UV radiation, and to improve thermal stability. Also, colorants can be added in order to provide a specific property profile in any given color. Please see the following data sheets:
Additives, Modifiers, and Reinforcing Agents:
Additives- UV stability, easy release (mold releases), colorants, and other stability additives
Flame retardants, impact modifiers, flow enhancers
Glass fibers, mineral fillers