Novel organopolysiloxane, method for the preparation thereof and

Details Novel organopolysiloxane, method for the preparation thereof and Novel organopolysiloxane, method for the preparation thereof and

1986-06-24

1987-07-28

Shaver, Paul F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Silicon containing

556456, 528 10, 528 12, 528 24, 528 32, C07F 708

Patent

active

046833200

ABSTRACT:
In the alkenyl-containing diorganopolysiloxane of the invention, the distribution of the alkenyl groups in the molecule is not random as in conventional alkenyl-containing diorganopolysiloxanes but each of at least three siloxane units linked to each of the terminal silicon atoms has an alkenyl, e.g. vinyl, group while at least six of the uninterruptedly linked siloxane units excepting the above mentioned alkenyl-containing units adjacent to the molecular chain ends are free from aliphatic unsaturation. A method for the preparation of the diorganopolysiloxane having the alkenyl groups in such a localized distribution is disclosed. When the diorganopolysiloxane is used as the principal ingredient of a curable organopolysiloxane composition as combined with a crosslinking agent, the composition, despite its relatively low viscosity, can give a cured rubber having markedly improved mechanical strengths.

REFERENCES:
patent: 2480822 (1949-09-01), Hyde
patent: 2714099 (1955-07-01), Weyenberg
patent: 3183209 (1965-05-01), Hartung et al.
patent: 3249581 (1966-05-01), Nelson
patent: 3284406 (1966-11-01), Nelson
patent: 3843601 (1974-10-01), Bruner
patent: 4172101 (1979-10-01), Getson

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