ADDITIVES FOR POLYMER COMPOSITIONS

摘要

The present invention provides an additive system for vinyl chloride polymer formulations to improve both the processing of the formulations and the functional characteristics of medical products made from the formulations. The additive system surprisingly exceeds previously known systems with respect to the melt fabrication and heat stability of the polymer formulations and the desired product characteristics of the products manufactured from such materials. Preferably, the additive system of the present invention comprises optimal amounts of the combination of a zinc salt primary stabilizer with an epoxide secondary stabilizer and a polyethylene external lubricant. Other processing aids and performance additives such as bases, antioxidants and internal lubricants, may be included. The additive system can be utilized with either plasticized or non-plasticized vinyl chloride polymer formulations.