Vulcanized (per) fluoroelastomer sealing articles
AssigneeSolvay Solexis S.p.A.
InventorsMilena Stanga, Claudia Manzoni, Giovanni Comino, Margherita Albano
Life of this patent
Estimating the term…
Abstract
This invention pertains to sealing articles of vulcanized (per)fluoroelastomer compositions incorporating particles of a vinylidene fluoride (VDF) polymers having a Shore A hardness of at least 85 when determined according to ASTM D 2240 Type A Durometer method, and a compression set of less than 30%, when determined according to ASTM D395 at 200° C. for 70 h on O-ring according to ASTM D1414, and to a process for their manufacture by vulcanizing-molding and thermal post-treating at a temperature above the melting point of the VDF polymer.
Claims12
A sealing article comprising a vulcanized (per)fluoroelastomer composition incorporating particles of a semicrystalline thermoplastic fluoropolymer chosen from vinylidene fluoride (VDF) homopolymers and copolymers of VDF with one or more monomers containing at least one unsaturation of ethylenic type, in which the sum of the comonomers other than VDF is ≦15 mol % relative to the total amount of monomers in the copolymer, the amount of semicrystalline thermoplastic fluoropolymer being between 30% and 90% by weight relative to the total weight of the (per)fluoroelastomer and of the semicrystalline thermoplastic fluoropolymer, the vulcanized composition having a Shore A hardness of at least 85 when determined according to ASTM D 2240 Type A Durometer method, and a compression set of less than 30%, when determined according to ASTM D395 at 200° C. for 70 h on O-ring according to ASTM D1414.
Dependencies are inferred from the claim text.