Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1996-10-29
1998-12-01
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
528 25, 528 26, 528 27, 528 28, 528 29, 528 30, C08F28300
Patent
active
058440534
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL BACKGROUND
The present invention relates to an organo-polysiloxane derivative, a process for the preparation thereof, a dispersing agent for dispersing a silicone gel in a curable resin, and a curable resin composition containing the dispersing agent and the silicone gel.
BACKGROUND ART
Epoxy resins are so superior in thermal, mechanical an electrical characteristics that they hitherto have been utilized extensively as adhesives, paints, materials for insulating electrical and electronic parts, materials for sealing electrical and electronic parts, and so on.
For epoxy resins, however, cured articles obtained by curing the epoxy resins present the problem that internal stress may be caused to occur in the cured articles, resulting various problems. For instance, in instances where electronic parts are sealed with an epoxy resin the cured epoxy resin may cause trouble or damage in the electrical and electronic parts sealed by the epoxy resin due to its internal stress.
It has been proposed that silicone gel be added in order to decrease the internal stress of the cured epoxy resin articles (Japanese Patent Unexamined Publication No. 61-185,527). The silicone gel, however, suffers from the disadvantage that it is difficult to disperse in an epoxy resin because it is poor in compatibility with the epoxy resin.
Further, generally speaking, although not limited to the curable epoxy resins, curable resins are likely to cause internal stress when cured. For the curable resins other than the epoxy resins, it is also possible to decrease the internal stress in their cured materials by adding a silicone gel thereto. It has been found difficult, however, to disperse the silicone gel in the curable resins other than the epoxy resins.
The objects of the present invention include the following agent for dispersing a silicone gel in a curable resin homogeneously and a process for the preparation thereof; silicone gel in a curable resin homogeneously; and the dispersing agent for the silicone gel. description that follows.
DISCLOSURE OF INVENTION
The present invention provides: structure as represented by general formula (1) below in its moiety; having the chemical structure as represented by general formula (1) below in its moiety, which is characterized by the first reaction step in which an organo-polysiloxane compound A having an active hydrogen-containing group at each of its terminal and having from 5 to 70 siloxane bonds is reacted with a bifunctional organic compound B having two functional groups each reactable with the active hydrogen thereof and by the reaction of the reaction product obtained by the first step with a mixture of a bifunctional organic compound C having two active hydrogen-containing groups with a bifunctional organic compound D having two functional groups each reactable with the active hydrogen; characterized by the organo-polysiloxane derivative having the chemical structure as represented by general formula (1) below in its moiety; and gel and the organo-polysiloxane derivative having the chemical structure as represented by general formula (1) below in its moiety.
p denotes an integer of from 1 to 20, preferably from 1 to 17.
It is to be noted that the bifunctional organic compound B may be the same as the bifunctional organic compound D. In this case, the general formula (1) may be rewritten as general formula (2) as follows:
In accordance with the present invention, the organo-polysiloxane derivative having the chemical structure as represented by general formula (1) can be prepared by the two reaction steps as will be described by the reaction formulas as follows:
In the above general formulas, reference symbols A, B, C, D, n and p have the same meanings as above.
In the organo-polysiloxane compound A to be employed as a raw material in the present invention, the groups containing active hydrogen connected to both terminals may include a hydroxyl group (--OH), a carboxyl group (--COOH), a mercapto group (--SH), an amino group (--NH.sub.2), --NHR (where R=a substituent),
REFERENCES:
patent: 3055858 (1962-09-01), Frye et al.
patent: 3247280 (1966-04-01), Kanner
patent: 3539655 (1970-11-01), Strachan et al.
patent: 3660434 (1972-05-01), Patterson
patent: 4851475 (1989-07-01), Federici et al.
Marquis Melvyn I.
Nagase-Ciba Ltd.
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