COMPOSIZIONI FLUOROELASTOMERICHE VOLCANIZZABILI
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 gene...
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Main Authors | , , |
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Format | Patent |
Language | Italian |
Published |
29.01.1999
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Edition | 4 |
Subjects | |
Online Access | Get full text |
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Summary: | 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. |
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Bibliography: | Application Number: IT1997MI01168 |