Composition of cyclic olefin addition copolymer and cross-linked material

A cross-linked material produced by cross-linking a cyclic olefin addition copolymer in a composition containing the cyclic olefin addition copolymer via siloxane bonds,

• wherein the cyclic olefin addition copolymer contains
• a recurring unit (a) shown by the following formula (1),
• and
• a recurring unit (b) shown by the following formula (2),
• said composition further comprising a phosphorous acid ester compound, a hypophosphorous acid ester compound, or a mixture thereof;
• wherein in formula (1), A1 to A4 individually represent a hydrogen atom, a hydrocarbon group having 1-20 carbon atoms, or an alkoxysilyl group or aryloxysilyl group represented by the formula —(CR1R2)fSi(OR3)gR4(3-g), —(CR1R2)fSi(R3R4)OSi(OR3)gR4(3-g), or —(CR1R2)fC(O)O(CH2)hSi(OR3)gR4(3-g);
• wherein R1 and R2 individually represent a hydrogen atom or hydrocarbon group having 1-20 carbon atoms, R3 is an alkyl group, alkenyl group, aryl group, or cycloalkyl group, each having 10 or less carbon atoms, R4 is a hydrogen atom, halogen atom, or hydrocarbon group having 1-20 carbon atoms, f and h are an integer of 0-5, and g is an integer of 1-3,
• provided that at least one of A1 to A4 is an alkoxysilyl group or aryloxysilyl group, Y represents —CH2— or —O—, and m is 0 or 1,
• wherein in formula (2), B1, B2, B3, and B4 individually represent a hydrogen atom or an alkyl group, aryl group, alkenyl group, or cycloalkyl group each having 20 or less carbon atoms, a halogen atom, a halogenated hydrocarbon group, or a polar group represented by —(CH2)jX;
• wherein X represents a group —C(O)OR5 or —OC(O)R6, wherein R5 and R6 represents an alkyl group, alkenyl group, aryl group, cycloalkyl group, or derivatives of these groups, each having 20 or less carbon atoms, or halogen-substituted groups of these groups, and j is an integer of 0-5, or
• B1 and B2 or B3 and B4 form an alkylidenyl group in combination, or B1 and B4, B1 and B3, B2 and B3, or Bz and B4 form a cycloalkylene group or cycloalkenylene group in combination, and n is an integer of 0-2.