Document NenGq0Bx3vKa2X5bbrb17DLZg

7to R. A. Chartier m at As sonet DATE April 3, 1974 FROM subject F. R. Klebacher vr As sonet DETERMINATION OF RESIN RESIDUAL MONOMER DISSIPATION TIME - PRELIMINARY copy to l. a. Baker R. H. Carte D. C. Foster E. J, Goettman E. D. Macias A method has been developed which measures the total residual monomer in Trulon resin. This method has been used since January 1972 for the study of monomer in high bulk density resin. At that time, an initial study was made on the time required for this monomer to dissipate from a single sample left standing in a paper bag. The results are shown on the attached graph. In general, the sample started at 840 ppm and in 22 days had gone to below detectability. As a result of the current concern over any source of residual vinyl chloride monomer, this initial work is to be expanded as to levels of VCM in current resin production. The results of the initial studies in this series are also shown on the attached graphs. Generally speaking, it was found that: 1. VCM residual levels detectable are much lower. This could arise from several reasons: a. Improved drying from recent dryer modifications and therefore lower total volatiles. b. A different type of resin. c. Some change in instrument detection limit and/or loss of VCM during sampling. 2. 520 resin shows a higher VCM level than 510. OLI 6173 3. These preliminary results show inconsistencies with 510 dissipating more quickly. It is apparent the study should and will continue. At present, we are (1) tightening up the sample taking to reduce the possible loss of VCM, (2) taking more resin samples to impro1 s will issued. ONI rc*a____ OTHCK. OLI 6174 VC/vj d t - r e o r t E d ; \* \- LtEjere* cla ^.o (.?3_53) _MA<i< 3/c /?1/............. .. X3 5*/0 (, m^)'- " 3//?/7f ^ ^2.0^7^^ w 3/M/7^ Nrrcf; nUe. 3/^/7^ CrrtV'S' /V vOM ^isr-fk\u\ SrAcrT 3, 7^ /sSb &*7c-?otBr/ /0>-Jl$O sU.yh &O^At>-aJi"WTUt OLI 6176