COMPOSIZIONI FLUOROELASTOMERICHE VOLCANIZZABILI

• Main Authors: WLASSICS IVAN, ZOMPATORI ALBERTO, STACCIONE ANNA
• Format: Patent
• Language: Italian
• Published: 20.11.1998
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS

Curable fluoroelastomeric compositions comprising: A) 100 phr (parts) of fluoroelastomeric copolymers based on vinylidenefluoride (VDF) and at least a partially or completely fluorinated comonomer having an ethylene unsaturation; B) 0.5 to 10 phr, preferably 2 to 6, of a curing agent having the general formula Ä(R3-Si)m-(CyM2y-O-CzM2z)p-(CtM2t-1)n-Pq-O-Ü2Q wherein m, y, z, p, t, n, q, are integers; R linear or branched aliphatic chain containing hydrogen and/or fluorine (M = H and/or F); or cycloaliphatic containing hydrogen and/or fluorine; or aromatic containing hydrogen or fluorine; or Pa wherein P is a bivalent (per)fluoropolyether linking group, a is an integer from 0 to 1; Q is an aromatic and aliphatic structure containing also fluorine, preferably bisphenol; with the proviso that when p is different from 0, m = 1 and n = q = 0; when n is different from 0, m = p = q = 0; when q is different from 0, m = 1 and p = n = 0; C) the accelerating agent being an onium-organic compound having a positive charge in amount from 0.05 to 5 phr, preferably from 0.5 to 2.