Document ExLpQgvexyqDRzmz1ojznzzp4

r< /*- ,/ IV / TELEX TO: L. FEYT, MONSANTO TECH. SERV. LOUVAIN LA NEUVE MARCH 17, 1977 FROM: D. H. PAUL MONSANTO GALT LAB 800 NO. LINDBERGH ST. LOUIS, MO. 63166 (314) 694-4787 47-000-760.71-034 REGARDING YOUR QUESTIONS CONCERNINGtfOLYSULFIDE SEALANTS-1 FOR DOUBLE-GLASS WINDOWS: ^--------------- -------------" 1) IT IS DIFFICULT TO MAKE SUGGESTIONS REGARDING CUSTOMER'S FORMULA WITHOUT KNOWING CUSTOMER'S FORMULA. CAN YOU GET IT? 2) POSSIBLE WAYS TO REDUCE VISCOSITY: A) REDUCE FILLER CONTENT OF FORMULA B) INCREASE PLASTICIZER CONTENT C) INCREASE POLYMER CONTENT ' D) REMOVE A SMALL PERCENTAGE OF THE S-278 AND SUBSTITUTE .. S--261 OR S-148 FOR IT (MAY CAUSE FOGGING PROBLEMS) E) USE A SMALL PERCENTAGE OF LOWER MOLECULAR WEIGHT POLYSULFIDE POLYMER (MAY HURT PHYSICAL PROPERTIES). 3) TO REDUCE SEPARATION PROBLEM: A) INSTEAD OF LEAD OXIDE, USE MANGANESE DIOXIDE (Mn02) AVAILABLE FROM DIAMOND SHAMROCK (GRADE "D") B) ADD A SMALL AMOUNT OF VERY FINE PARTICLE CARBON BLACK (10-15 MILLIMICRON ' PARTICLE DIAMETER) TO CURING PASTE. 4) ONE COMPONENT SEALING FORMULATIONS ARE NOT RECOMMENDED FOR DOUBLE GLASS WINDOWS. ONE COMPONENT SYSTEMS CURE MUCH TOO SLOWLY. WINDOWS SHOULD NOT BE INSTALLED UNTIL SEALANT HAS CURED. VISCOSITY MEASUREMENTS ARE NOT MEANINGFUL FOR THIS TYPE OF APPLICATION SINCE IDEAL WINDOW SEALANTS ARE THIXOTROPIC. CONT'D ON PAGE 2. L ) i DSW 588412 STLCOPCB4093748 TO: L. FEYT LOUVAIN LA NEUVE PAGE 2 HERE IS A SATISFACTORY GLASS SEALANT FORMULA: BASE: ,THIOKOL LP-2 \ WHITCARB RC CCfc CO*; T102 - RA-50 A-187 (Silane) STEARIC ACID THIXATROL ST SANTICIZER 278 100.0 45.0 15.0 3.0 0.3 3.0 25.0 CATALYST: Mn02 "D" SANTICIZER 278 FINE CARBON BLACK 10.0 10.0 0.6 211,9 USE OF SILANES IN POLYSULFIDES IS COVERED BY U. S. PATENTS 3123495 AND 3312669 ... WHILE Mn02 CURATIVE IS COVERED IN US 2940959 AND 3282902. WE HOPE THIS WILL STILL BE OF SOME VALUE. REGARDS D. H. PAUL CC: N. W. Touchette J. A. Cannon ds\n 588413 STLCOPCB4093749