| 摘要 |
1487355 Iron carbonyl-stabilized diorganopolysiloxanes UNION CARBIDE CORP 3 Dec 1974 [5 Dec 1973] 52315/74 Heading C3T Heat-stabilized diorganopolysiloxanes are obtained by heating a diorganopolysiloxane consisting essentially of Me 2 SiO, Ph 2 SiO, MePhSiO, MeViSiO, Me(HO)SiO, Me 3 SiO 0À5 and/or units with an iron carbonyl in amount providing 20-10,000 p.p.m. of Fe in the product at 120- 350‹ C. in the presence of molecular oxygen. In Examples 1-6 0À1 wt. per cent of Fe(CO) 5 is added to a trimethylsiloxy-terminated polydimethylsiloxane of 350 cS./25‹ C.; the mixture is heated under air, or with air bubbling after 0À5-1À5 hours or immediately, at 124-200‹ C. for 1À3-20 hours. In later examples this mixture is added as a concentrate to other polydimethylsiloxane oils (Examples 9-17); or Fe(CO) 5 is heated with an ethoxy-terminated polydimethylsiloxane oil, which is added to a silicone rubber composition (Example 20), or with a polydimethylsiloxane oil containing methyl phenyl siloxane units (Example 27), or with a silanol-terminated and cyclic polydimethylsiloxane mixture (Example 21). |
