Patent ID: 7851066
Filing Date: 2010-12-14
Classification: C08G,C08L,Y10T

Abstract:
1. A curable fluoropolyether composition, comprising (a) 100 parts by weight of a polyfluorodialkenyl compound having alkenyl groups at both ends of the molecular chain, represented by the formula (14), wherein Rf is a divalent group of the formula (i): wherein p and q each are an integer of 1 to 150, the sum of p+q is on average 2 to 200, r is an integer of 0 to 6, and t is 2 or 3; or Rf is a divalent group of the formula (ii): wherein u is an integer of 1 to 200, v is an integer of 1 to 50, and t is 2 or 3, Z is a divalent group of the formula: —CH R is hydrogen or a substituted or unsubstituted monovalent hydrocarbon group, Z′ is a divalent group of the formula: —CH R is hydrogen or a substituted or unsubstituted monovalent hydrocarbon group, and a is independently 0 or 1, (b) a fluorinated organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms (SiH groups) per molecule in a sufficient amount to provide 0.5 to 5.0 moles of SiH groups per mole of alkenyl groups available from component (a), (c) a platinum group metal catalyst in an amount to provide 0.1 to 500 ppm of platinum group metal based on the total weight of components (a) and (b), (d) 5 to 50 parts by weight of hydrophobic silica powder, (e) 0.01 to 15 parts by weight of a tackifier in the form of at least one silicon compound selected from the general formulae (I), (II), and (III): wherein A and B each are a silane or siloxane linkage having at least one silicon-bonded hydrogen atom and, optionally a silicon-bonded substituent group, said substituent group, if present, is an unsubstituted hydrocarbon group of 1 to 20 carbon atoms, A is a monovalent linkage, B is a divalent linkage, C and E are at least one monovalent group selected from the group consisting of the following formulae: (2), (4), (6), (7) and (8), and optionally another group, said another group, if present, being an alkyl, D is a divalent linkage comprising at least one group of the following formulae: (1), (3), (5), (9), (10), (11), (12) and (13), and optionally another group, said another group, if present, being an alkylene group, with the proviso that E is a monovalent linkage in which the total number of atoms other than hydrogen and halogen atoms is at least 8, x is 0 or a positive number, R X is a divalent group selected from the group consisting of: R n is an integer of at least 2, and (f) 0.01 to 10 parts by weight of an organosiloxane having per molecule at least one silicon-bonded hydrogen atom, at least one epoxy and/or trialkoxysilyl group attached to a silicon atom via carbon atoms or via carbon and oxygen atoms, and at least one perfluoroalkyl or perfluoropolyether group of 1 to 20 carbon atoms attached to a silicon atom via a divalent organic group.