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Overview

The ability of filled poly(vinyl chloride) (I) resins to resist straining and hold stress was determined as a measure of the dimensional stability of finished products.The compositions examined contained CaCO3, silane-coated wollastonite, wollastonite, aminosilane-modified hydrated Al silicate, mercaptosilane-modified hydrated Al silicate, and anhydrous Al silicate with plasticizers such as dioctyl phthalate, Bu benzyl phthalate, dioctyl adipate, and tricresyl phosphate at varying concentrationsTensile stress was determined as a function of filler content and plasticizer content and stress vs. strain curves were plotted for plastisol film formulation.The effect of increasing levels of low-mol.-weight bulk polymerized I extender resin in a plastisol held under constant stress was also determined as a function of time.The short-term strain recovery of the compositions was shown and different plasticizer concentrations were examinedA plot of compliance vs. time for different fillers showed their relative reinforcing properties and stress relaxation was also determined as a function of time at room temperature and higher temperaturesStress and strain recovery occurred simultaneously, but the latter process took place at a more rapid rate.Increased plasticizer concentrations and low filler levels improved strain recovery, but not stress relaxation.Dimensional stability was achieved by using high-mol.-weight resins with a low plasticizer level and a high concentration of a reinforcing or silane-coated filler, and having min. retarded straining properties.

Fire retardant polyesters

Author: Selley, Jefferey E.

The use of fire retardants, their mechanisms, and flame testing methods for polyester compositions are discussed.

100 Deals associated with Hooker Chemical Sdn. Bhd.

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100 Translational Medicine associated with Hooker Chemical Sdn. Bhd.

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