US 6,982,294 B2
Flame retardant and flame-retardant resin composition
Kazuaki Matsumoto, Osaka (Japan); Yoshitaka Ono, Osaka (Japan); and Tatsushi Yoshida, Hyogo (Japan)
Assigned to Kaneka Corporation, Osaka (Japan)
Appl. No. 10/31,210
PCT Filed May 11, 2001, PCT No. PCT/JP01/03939
§ 371(c)(1), (2), (4) Date Jun. 03, 2002,
PCT Pub. No. WO01/85870, PCT Pub. Date Nov. 15, 2001.
Claims priority of application No. 2000-138974 (JP), filed on May 11, 2000.
Prior Publication US 2003/0130387 A1, Jul. 10, 2003
Int. Cl. C08K 5/5419 (2006.01)
U.S. Cl. 524—267 4 Claims
 
1. A flame retardant comprising:
an aromatic group-containing organosiloxane compound having the mean composition formula R1mR2nSiO(4-m-n)/2 in which
R1 represents a univalent aliphatic hydrocarbon group containing 1 to 4 carbon atoms,
R2 represents a univalent aromatic hydrocarbon group containing 6 to 24 carbon atoms,
R1 and R2 each may contain two or more species, and
m and n are numbers satisfying the mathematical relationships 1.1≤m+n≤1.7 and 0.4≤n/m≤2.5,
wherein the aromatic group-containing organosiloxane compound comprises Q unit (SiO2) as an essential unit or consists of M unit (R3SiO0.5) and T unit (RSiO1.5);
said compound being non-flowable at 23° C., flowable at 200° C., non-gelatable when at 200° C. and stirred for 30 minutes; and
said compound having a number average molecular weight of not less than 2,000 and being dissolvable in an amount of not less than 100 g in one liter of a toluene solvent at a temperature of 23° C.