Polymer and Materials Science
Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Oligomers of o-xylene (molecular weight ∼400) have been shown to be novel heat stabilizers for isotatic polypropylene film. In contrast to unstabilized films which failed after exposure of 5 hr in a 150°C air oven, a film containing 0.5 and 1.0 wt-% of the o-xylene oligomer survived 100 and 226 hr, respectively. Furthermore if 0.25% dilauryl thiodipropionate (DLTP) was also present, only 0.1 wt-% of the o-xylene oligomer was necessary to maintain a film intact up to 124 hr. In absence of DLTP, this low level of o-xylene oligomer was not effective. Oligomers of toluene, m-xylene, p-xylene, and 1,2,4-trimethyl benzene were found less effective.
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