Plasticizers

Poly(vinyl chloride) (PVC) slush powder has been widely used; we prepared it by dry blending. We found that the absorption of plasticizer by the PVC resins was the most important factor in the dry-blending process and, further, that different types of PVC resin had different absorption rates. This results of this study provide new information about the relationship of absorption to PVC and other parameters. Haake rheomix testing and the quantity of plasticizers absorbed by the PVC resins were used to characterize the absorption process. Suspension-polymerization poly(vinyl chloride.

Bis(2-ethylhexyl)phthalate, commonly abbreviated DEHP, is an organic compound with the formula C₆H₄(CO₂C₈H₁₇)₂. It is the most important "phthalate," being the diester of phthalic acid and the branched-chain 2-ethylhexanol. This colourless viscous liquid is soluble in oil, but not in water. It possesses good plasticizing properties. Being produced on a massive scale by many companies, it has acquired many names and acronymns, including BEHP, di-2-ethyl hexyl phthalate, as well as dioctyl phthalate.

Various methods for incorporating biocides into resin compositions have been disclosed in the prior art. By way of illustration, U.S. Patent 4,086,297 discloses a process for forming a solid thermoplastic composition containing a microbiocide utilizing very high levels of the microbiocide and two thermoplastic resins in conjunction with melt blending processing.

Aqueous extracts of a PVC transfusion tubing contracted isolated guiea-pig ilea. A pharmacological and chemical study (infrared spectroscopy, gas-liquid chromatography) showed that this was due to extration of the plasticizer, acetyl N-tributyl citrate (ATBC). The concentrations of ATBC to produce contractions of the isolated guinea-pig ileum (from 1 g/ml) can be compared with those achieved after recirculating tubing under conditions simuflating use.

Aqueous extracts of a PVC transfusion tubing contracted isolated guiea-pig ilea. A pharmacological and chemical study (infrared spectroscopy, gas-liquid chromatography) showed that this was due to extration of the plasticizer, acetyl N-tributyl citrate (ATBC). The concentrations of ATBC to produce contractions of the isolated guinea-pig ileum (from 1 g/ml) can be compared with those achieved after recirculating tubing under conditions simuflating use.