| abstract |
An addition-curable type rubber composition comprising a vinyl-containing organopolysiloxane as a base polymer and, particularly, further comprising as a crosslinking agent an organohydrogenpolysiloxane which contains, in its molecule, at least one unit having the following formula: <IMAGE> wherein J is an alkylene group of from 2 to 4 carbon atoms, Rf is a perfluoropolyether group, and a is an integer of from 0 to 2. The composition has excellent durability in repeated mold release, and a mold prepared from the composition is able to produce moldings of constant quality even when molding is repeated a large number of times. |