| 摘要 |
An organopolysiloxane of the formula <FORM:1103915/C3/1> wherein R1, R2 and R3 are each a saturated or unsaturated hydrocarbon (h.c.) radical, a sat. or unsat. cycloaliphatic h.c. radical, an aryl radical or an inertly substituted aforesaid radical, and n is a positive integer, can be made by reacting <FORM:1103915/C3/2> where X is a hydrolysable atom or radical, with <FORM:1103915/C3/3> The reaction, which occurs spontaneously on mixing of the reactants, may be effected with or without a diluent at temperatures, e.g. from -50 DEG to 100 DEG C. Examples describe the above preparation of (1) 1,5-dimethyl-1,1,5,5-tetrahydrogeno - 3,3 - diphenyltrisiloxane; (2) 1,1,7,7 - tetrahydro - 1,3,3,5,5,7 - hexamethyl tetrasiloxane; (3, 4, 5) CH3SiH2-[OSi(CH3)2-]nH2Si CH3, wherein n is 8, 140 and 335 respectively; (6) 1,7 - dimethyl - 1,1,7,7 - tetrahydro - 3,3,5,5 - tetraphenyltetrasiloxane; (7) CH3SiH2-[OSi(CH3)(C6H5)]180 -OH2SiCH3; and (8) C4H9-SiH2-[OSi(CH3)2]120 -OH2SiCH3. Uses: as waterproofing and anti-adhesion agents; and as intermediates for rubber-forming siloxanes. |
