Document veBZnxrvNqjkxeLy5NL61OOq

Monsanto FROM (NAME a LOCATION) A. W. Morgan - St. Louis Organic Research REFERENCE TO January 19, 1970 g-Phenoxy Benzyl Phthalate Aroclor Replacement Polysulfides N. W. Touchette Res. 3 M. W. FArrar J. R. Darby R. H. Mills J. A. Cannon A. W. M. Coaker C. S. Shull V On Res . Res . Res. Res. Res. Res. 1 1 3 3 3 3 Initial evaluations of g-phenoxy benzyl phthalate as a potential Aroclor replacement in polysulfide sealants have been completed. Excellent grind and flow properties have been found and, from a working standpoint, the g-phenoxy ester is exceptionally good. Both Aroclor 1254 and the g-phenoxy material form well bodied pastes with low sag. Pastes utilizing Santicizer 261 or Santi cizer 278 demonstrated considerable sagging and lacked body. Results of the evaluations were as follows: Resin 12 34 Formula: Thiokol LP 32 100 100 100 100 Carbon Black (Stalex F 12) 30 30 30 30 S-261 25 Aroclor 1254 25 g-phenoxy benzyl phthalate 25 S-278 25 Catalyst Lead Dioxide 50 50 50 50 Stearic Acid 5 555 S-261 45 Aroclor 1254 45 g-Phenoxy benzyl phthalate 45 S-278 45 Blend: Resin 100 Catalyst 15 Cure Times: Aroclor 1254/g-Phenoxy Benzyl Phthalate 4-5 hours Santicizer 261/Santicizer 278 15-45 minutes Plasticizer Shore A Hardness S-261 16 Aroclor 1254 30 g-Phenoxy benzyl phthalate N 24 S-278 ft 2, uhi kj 22 Tensile PSI 19 7 305 247 244 100% Modulus PSI 53 92 70 61 Elon gation 650 700 600 650 24 Hour Charcoal Volatility 3.3% 11.0% 1.97% 1.7% Water Absorption %% Absorbed Lost 1.50 1.20 0.60 0.46 1.77 1.78 0.83 0.67 _ "fa j U fiffrTT DS\N 588421 STLCOPCB4093757 N. W. Touchette January 19., 1970 Page 2 It is seen that 8-phenoxy benzyl phthalate gives essentially Santicizer 278 properties with Aroclor 1254 working character istics. A less efficient ester might be desired as the plasti cizer is often added to cheapen the formulation. The tetra- chlorophthalate analogue might be less efficient, however, it would appear that biodegradability must be determined before any product containing aromatic chlorine is promoted. Other wise we ay find ecological problems similar to those of the Aroclors. ' From this evaluation it is felt that 8-phenoxy benzyl phthalate and its analogues hold enough technical promise to warrant a more general and thorough evaluation. This evaluation will be completed in one month. Considering the possible need for such a compound it is recom mended that a reasonable cost study be made based on purchased and manufactured 8-phenoxy ethanol. C. S. Shull has pointed out that we are basic in phenol, benzyl alcohol, and phthalic ahnydride and use large quantities of ethylene oxide, all at reasonable costs. Manufacturing reportedly has an available facility for preparing 8-phenoxy ethanol. It appears that con siderable flexibility is possible in determining routes to this product, and it is hoped that costs for other analogues, includ ing that one made with 711 alcohol, may be considered. A. W. Morgan jP DSW 588422 I STLCOPCB4093758