摘要:
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.
摘要:
In one aspect, the invention provides curable fluoropolymer compositions comprising fluoropolymer, onium, and alkyl or aryl oxalate-blocked compound as a crosslinking agent. In other aspects, the invention provides methods of making curable fluoropolymer compositions and provides alkyl or aryl oxalate-blocked compounds.
摘要:
An aqueous curing composition of a fluoroelastomer containing a fluoroelastomer, a fluororesin, a curing agent, which further contains a surfactant which leaves 0.3 wt. % or less of a decomposition residue after being heated at 300° C. for 30 minutes and/or a polar solvent having a boiling point of 300° C. or less and a surface tension of at least 30 dyne/cm at room temperature. When a coating film is formed from this aqueous composition, a large amount of the fluororesin contained therein can be bled up on the surface of the coating film. Thus, the durability and non-tackiness of the coating film can be improved.
摘要:
A fluoroelastomer composition having improved compression set. The fluoroelastomer composition comprises: (1) a fluoroelastomer containing interpolymerized units of at least one perfluoroolefin, at least one perfluorovinyl ether, and a cure site component capable of participation in a peroxide cure reaction; (2) an additive selected from the group consisting of organo-oniums, phosphates, phosphine oxides, amine oxides, alkyl amines, and heterocyclic amines and salts of heterocyclic amines; (3) a peroxide curative, and (4) optionally a coagent.
摘要:
In one aspect, the invention provides curable fluoropolymer compositions comprising fluoropolymer, onium, and alkyl or aryl oxalate-blocked compound and carbonate-blocked compound as crosslinking agents. In other aspects, the invention provides methods of making curable fluoropolymer compositions and provides alkyl or aryl oxalate-blocked and carbonate-blocked compounds.
摘要:
A thermoplastic elastomer produced without a hydrogenation step is functionalized utilizing a free radical initiator and a functionalizing monomer having at least one point of unsaturation. The base polymers can be produced by copolymerizing an &agr;-olefin capable of producing an amorphous backbone with a comonomer which provides a “hook” for grafting to with a living polystyrene chain. Another method is to copolymerize an &agr;-olefin monomer system capable of producing an amorphous backbone with a comonomer containing a functional group from which an anionically polymerizable monomer is grown from the backbone. A third method involves copolymerizing an &agr;-olefin monomer system capable of giving an amorphous backbone with an olefin-terminated polystyrene comonomer. In a less preferred embodiment a conventional EPDM polymer can be metallated and a monoalkenyl aromatic compound anionically polymerizable monomer grown from the backbone.