Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
1995-03-31
2001-11-27
Dawson, Robert (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
active
06323280
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to thermoplastic molding compositions and more particularly to compositions containing a polydiorganosiloxane block copolycarbonate.
SUMMARY OF THE INVENTION
The present invention resides in the surprising properties found to characterize the thermoplastic molding composition which comprise a polydiorganosiloxane block copolycarbonate and an additive amount of a partially fluorinated polyolefin. The composition of the invention shows a surprising combination of improved flame retardance and high impact strength.
BACKGROUND OF THE INVENTION
Articles molded from polycarbonate resins are well known and are widely used in a variety of applications. Among their attractive properties, mention is often made of their impact strength and thermal stability. These and other properties make polycarbonate resins ideal material for the preparation of business machines.
The art is noted to include U.S. Pat. Nos. 4,252,916 and 4,663,391 which disclosed polycarbonate based compositions containing a partially fluorinated polyolefin. The compositions are respectively said to have improved thermal stability and improved wear resistance.
Translucent, flame-retardant polycarbonate compositions containing a salt and a partially fluorinated polyolefin have been disclosed in U.S. Pat. No. 4,220,583. Also noted in this connection is the composition disclosed in U.S. Pat. No. 4,749,738. Said to feature improved wear resistance, the composition contains a polycarbonate resin, a polyolefin, a fluorinated polyolefin and a silicone fluid.
It is an object of the present invention to provide a thermoplastic molding composition which is characterized by its improved flame retardance and impact performance.
REFERENCES:
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patent: 4220583 (1980-09-01), Mark
patent: 4252916 (1981-02-01), Mark
patent: 4391935 (1983-07-01), Bialous et al.
patent: 4600632 (1986-07-01), Paul et al.
patent: 4663391 (1987-05-01), Boutni
patent: 4749738 (1988-06-01), Boutni
patent: 382004 (1990-08-01), None
Krishnan Sivaram
Paul Winfried G.
White Roger J.
Bayer Corporation
Dawson Robert
Gil Joesph C.
Preis Aron
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