Crosslinkable elastic copolymer composition

Abstract

An elastic copolymer composition which contains a copolymer having a content of polymer units based on vinylidene fluoride as low as from 0.5 to 15 mol %, which is satisfactory in polyol vulcanizability and which gives a vulcanizate excellent in heat resistance and oil resistance. This composition comprises a tetrafluoroethylene (35 to 65 mol %)/propylene (20 to 50 mol %)/vinylidene fluoride (0.5 to 15 mol %) copolymer, an organic quaternary ammonium hydroxide or a salt of an organic quaternary phosphonium compound with a nitrogen-containing heterocyclic compound, an organic polyhydroxy compound, and a metal oxide or a metal hydroxide, and optionally contains an amine compound.

1 . A crosslinkable elastic copolymer composition characterized in that it comprises: 
 (A) an elastic copolymer comprising from 35 to 65 mol % of polymer units based on tetrafluoroethylene, from 20 to 50 mol % of polymer units based on propylene, and from 0.5 to 15 mol % of polymer units based on vinylidene fluoride,    (B) at least one member selected from the group consisting of an organic quaternary ammonium hydroxide represented by the general formula R 1 R 2 R 3 R 4 NOH (wherein R 1  to R 4  are the same or different C 1-20  hydrocarbon groups) or the following formula 1 (wherein R 5  is a hydrogen atom or a C 1-20  hydrocarbon group, and n is an integer of from 3 to 5), and a salt of an organic quaternary phosphonium compound with a nitrogen-containing heterocyclic compound:                          (C) at least one member selected from an organic polyhydroxy compound and its derivative, and    (D) at least one member selected from a metal oxide and a metal hydroxide.    
     
     
         2 . A crosslinkable elastic copolymer composition characterized in that it comprises: 
 (A) an elastic copolymer comprising from 35 to 65 mol % of polymer units based on TFE, from 20 to 50 mol % of polymer units based on P, and from 0.5 to 15 mol % of polymer units based on VdF,    (B) at least one member selected from the group consisting of an organic quaternary ammonium hydroxide represented by the general formula R 1 R 2 R 3 R 4 NOH (wherein R 1  to R 4  are the same or different C 1-20  hydrocarbon groups) or the following formula 1 (wherein R 5  is a hydrogen atom or a C 1-20  hydrocarbon group, and n is an integer of from 3 to 5), and a salt of an organic quaternary phosphonium compound with a nitrogen-containing heterocyclic compound:                          (C) at least one member selected from an organic polyhydroxy compound and its derivative,    (D) at least one member selected from a metal oxide and a metal hydroxide, and    (E) an amine compound excluding the compound represented by the formula 1.    
     
     
         3 . The crosslikable elastic copolymer composition according to  claim 2 , wherein component (E) is a tertiary amine excluding the compound represented by the formula 1.  
     
     
         4 . The crosslikable elastic copolymer composition according to  claim 2 , wherein component (E) is 1,8-diazabicyclo[5.4.0]undeca-7-ene.