Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
2001-07-17
2003-03-18
Sanders, Kriellion A. (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C524S400000, C524S544000
Reexamination Certificate
active
06534576
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a flame retardant organic resin composition.
BACKGROUND OF THE INVENTION
Because organic resins with aromatic rings, which are represented by aromatic polycarbonate resins and polyphenylene ether resins, possess superior mechanical strength, electrical characteristics, etc., they are used as engineering plastics in various fields, including OA equipment, electrical and electronic equipment, automobiles, construction and civil engineering. In many cases, these organic resins have been rendered flame retardant for the purpose of fire prevention. One of the methods employed in the past to render such organic resins flame retardant consisted in admixing compounds containing chlorine atoms and bromine atoms to these organic resins. However, organic resin compositions containing compounds of this type had defects such as generating significant amounts of smoke during combustion and producing gases harmful to the human body or gases corrosive to metals and such. For this reason, a considerable number of flame retardant resin compositions have been proposed that do not produce gases harmful to the human body.
In Japanese Unexamined Patent Application Publication No. Hei 08(1996)-176425, a composition was offered that was produced by compounding a silicone resin containing phenyl groups and epoxy groups, which was obtained by the hydrolysis of a phenyl-containing silane and an epoxy-containing silane, with an aromatic polycarbonate resin. However, due to the presence of the epoxy groups, the composition had various problems, such as decreased heat resistance and discoloration. In Japanese Unexamined Patent Application Publication No. Hei 10(1998)-139964, a polycarbonate composition was described that was produced by compounding a high molecular weight silicone resin with a weight average molecular weight in excess of 10,000, which consisted of difunctional siloxane units (D units) and trifunctional siloxane units (T units), with an aromatic polycarbonate resin. However, because the silicone resin used in that composition was a silicone resin of a high molecular weight, it was not easy to prepare. In addition, the flame retardancy of the resultant flame retardant polycarbonate resin composition was insufficient.
In Japanese Unexamined Patent Application Publication No. Hei 11(1999)-140294, a flame retardant polycarbonate resin composition was described that was produced by compounding a phenyl-containing silicone resin comprising difunctional siloxane units (D units) and trifunctional siloxane units (T units) with an aromatic polycarbonate resin. In addition, in Japanese Unexamined Patent Application Publication No. Hei 11(1999)-222559, a flame retardant aromatic polycarbonate resin composition was described that was produced by compounding a phenyl- and alkoxy-containing silicone resin comprising difunctional siloxane units (D units) and trifunctional siloxane units (T units) with an aromatic polycarbonate resin. The flame retardancy of these aromatic polycarbonate resin compositions, however, were not satisfactory for certain intended uses. In Japanese Unexamined Patent Application Publication No. Hei 11(1999)-140329, a flame retardant composition was described that comprised compounding silica powder and a phenyl- and alkyl-containing silicone resin comprising difunctional siloxane units (D units) and trifunctional siloxane units (T units) and including monofunctional siloxane units (M units) with an aromatic polycarbonate resin. However, that aromatic polycarbonate resin composition had various problems, such as the need to admix silica powder in a complicated manufacturing process.
As a result of in-depth investigations directed to solving the above-described problems, the authors of the present invention discovered that the flame retardant property of an aromatic ring-containing organic resin could be considerably improved if a specific branched organopolysiloxane was compounded therewith, thereby arriving at the present invention. It is an object of the present invention to provide an organic resin composition of superior flame retardancy.
SUMMARY OF THE INVENTION
A flame retardant organic resin composition comprising
(A) 100 parts by weight of an aromatic ring-containing organic resin and
(B) 0.01-50parts by weight of a branched organopolysiloxane described by average molecular formula
(R
1
3
SiO
1/2
)
a
(R
2
SiO
3/2
)
b
(SiO
4/2
)
c
(R
3
O
1/2
)
d
(HO
1/2
)
e
,
where each R
1
is independently selected from alkyl groups comprising 1 to 12 carbon atoms and alkenyl groups comprising 2 to 12 carbon atoms; each R
2
is independently selected from alkyl groups comprising 1 to 12 carbon atoms, alkenyl groups comprising 2 to 12 carbon atoms, and aryl groups comprising 6 to 12 carbon atoms, where the aryl groups of R
2
are at least 30 mol % based on total monovalent hydrocarbon in R
1
and R
2
, R
3
represents an alkyl group, subscripts a and b are positive numbers, and subscripts c, d, and e are 0 or positive numbers.
DESCRIPTION OF THE INVENTION
The present invention is a flame retardant organic resin composition comprising
(A) 100 parts by weight of an aromatic ring-containing organic resin and
(B) 0.01-50 parts by weight of a branched organopolysiloxane described by average molecular formula
(R
1
3
SiO
1/2
)
a
(R
2
SiO
3/2
)
b
(SiO
4/2
)
c
(R
3
O
1/2
)
d
(HO
1/2
)
e
,
where each R
1
is independently selected from alkyl groups comprising 1 to 12 carbon atoms and alkenyl groups comprising 2 to 12 carbon atoms; each R
2
is independently selected from alkyl groups comprising 1 to 12 carbon atoms, alkenyl groups comprising 2 to 12 carbon atoms, and aryl groups comprising 6 to 12 carbon atoms, where the aryl groups of R
2
are at least 30 mol % based on total monovalent hydrocarbon in R
1
and R
2
, R
3
represents an alkyl group, subscripts a and b are positive numbers, and subscripts c, d, and e are 0 or positive numbers.
The aromatic ring-containing organic resin of component (A) used in the present invention is exemplified by aromatic polycarbonate resins and polymer alloys thereof, polyphenylene ether resins and polymer alloys thereof, polyarylate resins, polysulfone resins, aromatic polyester resins such as polyethylene terephthalate resin and polybutylene terephthalate resin, aromatic polyamide resins, polyimide resins, polyamideimide resins, polyphenylene sulfide resins, styrene resins such as polystyrene resins, high-impact polystyrene resins, ABS resins, and AS resins, and other thermoplastic resins; Novolac-series epoxy resins, biphenyl-series epoxy resins, and other epoxy resins; phenolic resins, and other thermosetting resins. Preferable among these resins are aromatic polycarbonate resins and polymer alloys thereof.
The branched organopolysiloxane of component (B) used in the present invention is a component that constitutes a characteristic feature of the present invention and fulfills the function of imparting flame retardancy to component (A). Component (B) is represented by the average molecular formula
(R
1
3
SiO
1/2
)
a
(R
2
SiO
3/2
)
b
(SiO
4/2
)
c
(R
3
O
1/2
)
d
(HO
1/2
)
e
,
where each R
1
is independently selected from alkyl groups comprising 1 to 12 carbon atoms and alkenyl groups comprising 2 to 12 carbon atoms; each R
2
is independently selected from alkyl groups comprising 1 to 12 carbon atoms, alkenyl groups comprising 2 to 12 carbon atoms, and aryl groups comprising 6 to 12 carbon atoms, where the aryl groups of R
2
are at least 30 mol % based on total monovalent hydrocarbon in R
1
and R
2
, R
3
represents an alkyl group, subscripts a and b are positive numbers, and subscripts c, d, and e are 0 or positive numbers.
In the formula above for R
1
and R
2
, the alkyl groups comprising 1 to 12 carbon atoms are exemplified by methyl, ethyl, n-propyl, isopropyl, butyl, and hexyl, with methyl, ethyl, and isopropyl being the most preferable. The alkenyl groups comprising 2 to 12 carbon atoms are exemplified by vinyl and butenyl. The aryl groups comprising 6 to 12 carbon atoms in R
2
are exemplified b
Furukawa Haruhiko
Hatanaka Hidekatsu
Morita Yoshitsugu
Nakanishi Koji
Shiromoto Koji
Dow Corning Toray Silicone Co. Ltd.
Sanders Kriellion A.
Scaduto Patricia M.
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