Process for preparing linear organopolysiloxanes having terminal triorganosiloxy groups
Номер патента: CA1275415C
Опубликовано: 23-10-1990
Автор(ы): Jurgen Burkhardt
Принадлежит: Wacker Chemie AG
Опубликовано: 23-10-1990
Автор(ы): Jurgen Burkhardt
Принадлежит: Wacker Chemie AG
Реферат: PROCESS FOR PREPARING LINEAR ORGANOPOLYSILOXANES HAVING TERMINAL TRIORGANOSILOXY GROUPS Abstract of the Disclosure Linear triorganosiloxy-terminated organopolysiloxanes are prepared by the condensation of linear organopolysiloxanes having one Si-bonded hydroxyl group in each terminal unit in the presence of phosphonitrilic chloride, and after the organo-polysiloxane has reached the desired average viscosity and while still containing the phosphonitrilic chloride, the organopoly-siloxane is reacted with from 0.05 to 1 weight percent of hexa-organodisilazane, based on the weight of the starting organo-polysiloxane, with the proviso that a filler having a BET surface area of at least 50 m2/g does not exceed 1 weight per-cent, based on the weight of the starting organopolysiloxane.
Process for preparing chain-extended organopolysiloxanes
Номер патента: US6040412A. Автор: Eric Damme,Jean-Marc Gilson,Patrick Leempoel,Fabrice Lebecq,Takao Takemasa. Владелец: Dow Corning SA. Дата публикации: 2000-03-21.