Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Patent
1994-01-31
1994-11-29
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
556440, 556459, 556469, 528 34, 528 38, 528 41, C08G 7720
Patent
active
053692063
ABSTRACT:
A diorganopolysiloxane terminated only at one of the molecular chain ends with a (meth)acryloxyalkyl group bonded to the terminal silicon atom is prepared, instead of the prior art method in which a diorganopolysiloxane obtained by the anionic ring-opening living polymerization reaction of, for example, hexamethyl cyclotrisiloxane by using a lithium catalyst is subjected to a desalinating condensation reaction with a (meth)acryloxyalkyl dimethyl chlorosilane, by a novel method in which the diorganopolysiloxane obtained by the anionic ring-opening living polymerization reaction of, for example, hexamethyl cyclotrisiloxane is hydrolyzed and the thus obtained monofunctionally silanol-terminated diorganopolysiloxane is reacted with a (meth)acryloxyalkyl dimethyl dialkylamino silane to effect a deamination reaction. This method is advantageous in that the relatively narrow molecular weight distribution of the diorganopolysiloxane obtained by the anionic living polymerization is not affected and retained as such in the deamination reaction while not in the prior art method.
REFERENCES:
patent: 4737563 (1988-04-01), Arai et al.
patent: 5049635 (1991-09-01), Inoue
patent: 5288890 (1994-02-01), Inomata et al.
Kamei Masanao
Suzuki Tomohisa
Marquis Melvyn I.
Shin-Etsu Chemical Co. , Ltd.
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