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Monsanto TECHNICAL SERVICE BULLETIN We would like to present candidates for polysulfide sealants. We have used as a control the chlorinated biphenyls. A. AUTOMOTIVE The two most commonly used chlorinated biphenyls are Aroclor 1248 and 1254. We suggest the following candidates for evaluation: 1. Santicizer 679 2. Santicizer 213 3. Aroclor 5442/5460 (30%) plus Santicizer 261 (70%) for Aroclor 1248 replacement. 4. Aroclor 5442/5460 (52%) plus Santicizer 261 (48%) for Aroclor 1254 replacement. These products should have minimal softening or marring effect on acrylic enamels. The use of chlorinated terphenyls (Aroclor 5442/ 5460) will stabilize the physical properties of the sealant over a temperature range up to 70 C, thicken the plasticizer to give non-sag properties and provide the excellent adhesion characteristics of Aroclor plasticizers. On a per pound basis, Santicizer 679 is cheaper than Aroclor 1248 or 1254. Santicizer 213 is cheaper than Aroclor 1248 or 1254 on a pound-volume basis. Santicizer 261/solid Aroclor blends compare favorably with Aroclor 1248 or 1254 on a pound-volume basis. Aroclor 5442 and 5460 can be very readily dissolved in Santicizer 261. TOWOLDMONOQ25573 I B. LIGHT CONSTRUCTION The most commonly used AroeJor plasticizers in building sealants are: Aroclor 1248, 1254, 1260 and 1262. Monsanto suggestions for replacements are: 1. Santicizer 261 2. Santicizer 148 3. Aroclor 5442 or 5460 blends with Santicizer 160 or 261. Santicizer 26J An evaluation of Santicizer 261 versus Aroclor 1254 in polysulfide is shown in Tables 1 and 2. > 01 TOWOLDMONOQ25574 Table 1 SANTICIZER 261 VERSUS AROCLOR 1254 Molecular Weight Vap. Press. (200 C) Viscosity (centistokes) Weight/Gallon (LB 25 C) Santici2er261 368 1.00 mm. Hg. 78.3 (25 C) 8.9 Aroclor1254 326 9.00 mm. Hg. 7.5-10.0 (100 C) 12.8 At 25 PHR <A> in LP-32/SR F at 30 PHR Wt. Loss (7 days at 100 C) < 15% - 25% At 40 PHR <B) in LP-32/CaCO^ at 40 PHR Shore A % Wt. Loss (7 days at 70 C) 12 1.9% 21 2.1% 100% Modulus (psi) 100% Modulus (7 days in H20 at 70 C) (psi) 40 33 41 38 Tensile Strength (psi) Tensile Strength (7 days in H20 at 70 C) (ps.) 104 102 99 157 % Elongation % Elongation (7 days in H2Obi 70 Cl (psi) 365 665 475 835 TOWOLDMONOQ25575 Table 2 COMPARISON OF SANTICIZER 261 VERSUS FORMULATION AR0CL0R 1254 PHR AWEJGHT PHR PolysuHide 111 100 100 SRF Carbon Black 30 100 - Uncoated CaCO^ Plasticizer 25 40 40 B WEIGHT 100 CATALYST SYSTEM Lead Dioxide Stearic Acid Plasticizer 50 5 45 15 50 5 15 45 Sulfur - - - 0.1 (1) Thiokol's LP-32 # OZiZ7y3 TOWOLDMONOQ25576 Santicizer 148 Santicizer 148 should give lower volatility in polysulfides than Aroclor 1254. It is lower in viscosity. Santicizer 148 Santicizer 261 Vapor Pressure mm. Hg. (200 C) 0.54 1.00 Viscosity Centistokes (25 C) 22.0 78.3 Santicizer 148 (iso decyl diphenyl phosphate) has excellent resis tance to U. V. and outdoor weathering. This factor could lead to improved performance in sealants requiring good adhesion to glass. Evaluations so far indicate that Santicizer 148 performs favorably in comparison to Santicizer 278 in insulated glass sealants. Santicizer 148 is appreciably cheaper than Santicizer 278. Aroclor 5442/5460 Blends in Santicizer 160/261 Aroclor 5460 in blends with Santicizer 160 and 261 has been screened in a polysulfide formulation. Results are shown in Table 3. By using Aroclor 5442 or 5460 blends with Santicizer 160 or 261, a formulator can have much greater versatility in obtaining an equivalent to or a compromise between Aroclor 1248, 1254, 1260, 1262. Ways to do this are shown in Table 4. The solid Aroclor can be easily dissolved in Santicizer 160 or 261 by heating the blend. In the case of Aroclor 5442, a temperature of 50 C (122 F) should be adequate. TOWOLDMONOQ25577 Polysulfide (1) Filler Plasticizer Lead Dioxide Santicizer 160 Stearic Acid : 100 : 30 : 25 : 50 : 45 :5 Table 3 Plasticizer Aroclor 1254 Aroclor 1260 Aroclor 5460/Santicizer 160 (2/1) Aroclor 5460/Santicizer 261 (2/1) Aroclor 5460/Santicizer 261 (1/1) Initial Hardness (24 Hour Cure) Shore A 28 30 30 29-30 26-27 (D Thiokol's LP-32 (2) Activated carbon method Volatility % Plasticizer Lost (1 Day/ 87 C) <2) 7.5 4.0 4.5 02 127^ TOWOLDMONOQ25578 Table 4 Santicizer 261 Santicizer 160 ( Aroclor 1248 { Aroclor 1254 Viscosity (Centipoises) #6 HAT Brookfield at 23 C % Aroclor 5460 By Weight 33-1/3 50 67-2/3 ~ 670 ~ 9,700 ~~ 440 ~ 4,000 300-400 cps ) 458,000 375,000 12,000 cps TOWOLDMONOQ25579 021Z7^7 "Nothing contained heiem Is la !> construed as a recommendation lo usa any product in conflict with any patent. MONSANTO MAKES NO WARRANTIES AS TO THE IITNESS OR MERCHANtABILITY OF ANY PRODUCTS Rt I IKItED TO, no guarantee ol sattslectory results Irom reliance upon contained inlormation or recommendations, and disclaims all liability tor any resulting loss or damage.1' MONtANTO COMPANY ORGANIC CHEMICALS DIVI8ION.MO No. Urdbofjb Blvd., SL Louis, Mo. 61166 Akron, Ohio 443)3 260 Sprlngslde Dr. Atlanta, Ga. 30376* 3400 Peachtree Rd., N.l. Boston, Mass. 02149* Iverett Station Chicago, til. 60013* 31 SB ties Plaines Ave.. Dei Plaines, III. Cincinnati, Ohio 4S206* 1601 Madison Road Detroit, Mich. 4B236 * 600 Northland Towers East Honolulu, Hawaii 468)2 677 Ala Moana Bind. Houston, Tax 77027 6061 Westhelrner Road Los Angelas, Calif. 90022* 6670 (. Flotilla St. NEW ENGLAND AREA Hydiocaibons & Polymais Du. 730 Worcester St , Indian Orchard, Mass. 01061 Plastic Products 6 Resins Div. P. O. Bos 2130, Springfield, Mass. 0)101 New York, N. Y. 10017* 277 Park Aye. St. Louis, Mo. 63166* 300 N. Lindbergh Blvd. SAN rRANCISCO BAY AREA 2710 leleyette, Sanu Clara, Call). 96062 Seattle, Wash. 93121 2112 Third Avenue Wilmington, Del. 19803* 200S Concord Pike, rallies Monsanto t TOWOLDMONOQ25580