초록 ▼

The present invention provides a curable fluoroelastomer composition comprising: (a) a fluoroelastomer comprising a cure site component having a halogen capable of participation in a peroxide cure reaction; (b) an organic peroxide; and (c) a siloxane or silazane comprising one or more --SiH gro

The present invention provides a curable fluoroelastomer composition comprising: (a) a fluoroelastomer comprising a cure site component having a halogen capable of participation in a peroxide cure reaction; (b) an organic peroxide; and (c) a siloxane or silazane comprising one or more --SiH groups. The curable fluoroelastomer compositions generally show improved processing and the resulting cured fluoroelastomers generally have improved mechanical and physical properties.

대표청구항 ▼

The present invention provides a curable fluoroelastomer composition comprising: (a) a fluoroelastomer comprising a cure site component having a halogen capable of participation in a peroxide cure reaction; (b) an organic peroxide; and (c) a siloxane or silazane comprising one or more --SiH gro

The present invention provides a curable fluoroelastomer composition comprising: (a) a fluoroelastomer comprising a cure site component having a halogen capable of participation in a peroxide cure reaction; (b) an organic peroxide; and (c) a siloxane or silazane comprising one or more --SiH groups. The curable fluoroelastomer compositions generally show improved processing and the resulting cured fluoroelastomers generally have improved mechanical and physical properties. 1. A propylene/ethylene-α-olefin block copolymer obtained by polymerizing propylene in the presence of a catalyst comprising a combination of (A) a stereorigid chiral compound of zirconium or hafnium, having a cyclopentadienyl ring and (B) at least one member selected from the group consisting of (i) aluminoxanes, (ii) compounds which react with the transition metal compound to form a stable anion and (iii) organoaluminum compounds, as essential components in the first-stage to produce a polypropylene component; and then copolymerizing ethylene, an α-olefin selected from the group consisting of 1-butene, 1-hexene and 1-octene and optionally propylene in a second-stage in the presence of the polypropylene component formed in the first-stage to obtain a random copolymer component, which satisfies (I) to (II): (I) the content of the polypropylene component having an intrinsic viscosity [(η)] measured in tetralin at 135° C. of from 0.5 to 5.0 dl/g is from 5 to 95% by weight;