Document V3RqwmyzrXBRZoOZQmYROxOqw

IMPROVED PLASTICIZERS FOR POLYSULFIDES 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. Q 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. : Q DSW 322329 STLCOPCB4073980 B. LIGHT CONSTRUCTION The most commonly used Aroclor 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 261 An evaluation of Santicizer 261 versus Aroclor 1254 in polysulfide is shown in Tables 1 and 2. C STLCOPCB4073981 o Table 1 SANTICIZER 261 VERSUS AROCLOR 1254 Molecular Weight Vap. Press. (200 C) Viscosity (centistokes) Weight/Gallon (LB 25 C) Santicizer261 368 1.00 mm. Hg. 78.3 (25 C) 8.9 Arodor1254 326 9.00 mm. Hg. 7.5-10.0 (100 C) 12.8 At 25 PHR <A) in LP-32/SRF at 30 PHR Wt. Loss (7 days at 100 C) < 15% ~ 25% At 40 PHR jn LP-32/CaCO3at40PHR 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) (psi) 104 102 99 157 % Elongation % Elongation (7 days in at 70 C) (psi) 365 665 475 ; 835 DSW 322331 STLCOPCB4073982 FORMULATION Polysulfide (1) SRF Carbon Black Uncoated CaCO^ - Plasticizer . Table 2 COMPARISON OF SANTICIZER 261 VERSUS AROCLOR 1254 PHR A WEIGHT PHR 100 100 30 100 - - 40 25 40 B WEIGHT 100 CATALYST SYSTEM Lead Dioxide 50 Stearic Acid 5 ____ Plasticizer . .45 15 50 5 15 45 - ------ Sulfur - - - 0.1 ^ Thiokol's LP-32 i OS\N 322332 STLCOPCB4073983 i l t- 4 i. t1 i i l it * t i l i I# i Santicizer 148 Santicizer 148 should give lpwer volatility in polysulfides than Aroclor 1254. It. is lower in viscosity. Santicizer 148 Santicizer 261 Vapor Pressure mm. Hg. (200C) 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. DSVJ 322333 STLCOPCB4073984 Polysulfide ^ Fillet 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 <1> Thiokol's LP-32 12) Activated carbon method Volatility % Plasticizer Lost (1 Day/ 87 C) 12) 7.5 4.7 4.5 4.0 4.5 DS\N 322334 STLCOPCB4073985 Table 4 Santicizer 261 Santicizer 160 ( Aroclor 1248 ( { Aroclor 1254 Viscosity (Centipoises) #6 HAT Brookfield at230 X Aroclor 5460 By Weight 33-1/3 50 67-2/3 ~ 670 9,700 458,000 ~ 440 4,000 375,000 : 300-400 cps ) ) 12,000 cps ) i DSW 322335 STLCOPCB4073986  @ "Nothinf contained herein h to be construed os a recommendation to use any product In conflict with any patent. MONSANTO MAKES NO WARRANTIES AS TO THE FITNESS OR MERCHANTABILITY OF ANY PRODUCTS REFERRED TO, no juarintee el satisfactory mutts Irons reliance upon contained intormation or recommendations, and disclaims all liability lor any resullini loss or damaie." MONSANTO COMPANY. ORGANIC CHEMICALS DIVISION SOO No. Lindbergh Blvd., St Louis. Mo. SS16S Akron, Ohio 44313 260 Sprinttide Dr. Atlanta, to. 30326* 3400 Peachtree Rd.. M L Boston, Mass. 02149* tviiett Station Ulcato. Id. 60011. 1168 Dei Plaints Ave.. Dot Plaines, IIL Cincinnati. Ohio 46206* 1601 Madison Road Detroit, Mich. 68236* 600 Northland Tom East Henokilu. Hawaii I6S12 677 Ala Moana Blvd. Houston, Tea. 77077 6061 Westhermer Road Los Aniaies. Calif. 90022* 6670 E. Flotilla St. NEW ENGLAND AREA Hydrocarbons A Polymers Div. 730 Worcester SI., Indian Orchard, Mata. 01061 Plastic Products A Resins Ohr. P. O. Box 2130, SprlnifteM, Mau. 01101 New York, H. Y. 10017 * 277 Park Ava. St. Louis, Mo. 63166 * 800 N. llndberh Bhrtf. SAN FRANCISCO BAY AREA 2710 Lafayette. Santa Clara. Calif. 96062 Seattle. Wash. 98121 2112 Third Avenue Wilmirtfton, Del. 19803* 2006 Concord Pike, Fairfax Monsanto DSW 322336 *3 r r n acta r. i rmri iki i i c n STLCOPCB4073987