Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Patent
1989-11-20
1991-10-29
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
528 27, 528 28, 525479, 556419, C08G 7704
Patent
active
050617745
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a novel polysiloxanes containing imide terminal groups shown by the following formula(I), and to process for preparing the polysiloxanes. Especially, the present invention relates to the polysiloxanes, shown by the following formula(I), which can be effectively used as a modifying agent in the field of synthetic resins. ##STR1## wherein R.sub.1 and R.sub.2, are each methyl, ethyl, propyl or phenyl; substituted alkylene having carbon atoms of 1 to 8; polymerization of the polysiloxane; and 2 to 20.
BACKGROUND ART
Recently, there have been widely known, various plastics which have been modified with siloxane compounds.
For the purpose of modifying synthetic resins, polysiloxanes containing hydroxy terminal groups have already been used. In the GB patent No. 880,022, there is disclosed a method of reacting a polyoxyalkylene with a polysiloxane containing two alkoxy groups at ends, to give polyoxyalkylene-polysiloxanediol block copolymers.
Also, a process for preparing new polysiloxanes containing hydroxy terminal groups is proposed in U.S. Pat. No. 3,981,898, in which polysiloxanes containing hydroxy terminal groups are prepared by reacting polysiloxanes with polyols and diols.
However, when said polysiloxanes were used as modifying agents for thermosetting resins such as unsaturated polyesters, epoxy resins and the like, there was a disadvantage in that an excess flash which occurred during the molding process.
On the other hand, in the DE patent No. 1,618,836, there were used trisiloxanols, having hydroxy groups directly bonded to Si atoms, as the plastic modifier. However, such siloxanol compounds have a disadvantage in that it is difficult to process these compounds with organic resins and hence they cannot be suitably used as modifying agents for synthetic resins.
Therefore, the present inventors have eagerly studied to overcome the prior disadvantages as described above, and consequently have developed novel polysiloxanes containing imide terminal groups which are effectively used as modifying agents, especially for thermosetting resins such as unsaturated polyesters, epoxy resins, polyamides and so on.
SUMMARY OF THE INVENTION
An object of the present invention is to provide new polysiloxanes in which both terminals thereof are substituted by imide groups, which are shown by the formula(I).
Another object of the present invention is to provide a process for preparing the polysiloxanes containing imide terminal groups, which are shown by the formula(I).
DISCLOSURE OF THE INVENTION
The present invention relates to the polysiloxanes containing imide terminal groups, shown by the following formula(I), which may be prepared by the Michael addition reaction of a bismaleimide, shown by the following formula(II) and a polysiloxane, shown by the following formula(III) at a temperature of 110.degree. to 150.degree. C. ##STR2## wherein R.sub.1 and R.sub.2, are each methyl, ethyl, propyl or phenyl; substituted alkylene having carbon atoms of 1 to 8; polymerization of the polysiloxane; 2 to 20; and atoms and containing a carbon-carbon double bond.
In the present invention, the bismaleimides of the formula(II) include, for example, N,N'-1,3-phenylene bismaleimide, N,N'-4,4'-diphenylmethane bismaleimide, N,N'-4,4'-diphenylether bismaleimide, N,N'-4,4'-diphenylsulfone bismaleimide, N,N'-3,4'-diphenylsulfone bismaleimide, N,N'-4,4'-dimethylcyclohexane bismaleimide, N,N'-4,4'-diphenylcyclohexane bismaleimide, N,N'-1,3-xylilene bismaleimide, 2,4-bismaleimide toluene, 2,6-bismaleimide toluene, and so on.
The polysiloxanes of the polysiloxane diamines of the formula(III) include, for example, poly(dimethyl siloxane), poly(methylphenyl siloxane), poly(epoxy-modified siloxane), poly(dimethyl siloxane)-co-poly(diphenyl siloxane), fatty acid-modified polysiloxane, polysiloxane-polyether copolymer, and so on.
According to the present invention, the bismaleimide of the formula(II) is preferably used in an amount of 3 to 10 parts by weight, more preferably 4 to 7 parts by
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Kim Myung J.
Park Jung O.
Song Ju O.
Lucky Ltd.
Marquis Melvyn I.
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