To provide a novel diamine, and a polyimide precursor and a polyimide using it. A diamine represented by the formula (1):
wherein each of X
1
and X
5
which are independent of each other, is a single bond or the like; each of X
2
and X
4
which are independent of each other, is —CH
2
— or the like; X
3
is a C
1-6
alkylene or the like; each of Y
1
and Y
2
which are independent of each other, is a single bond or the like; R is a C
1-20
linear, branched or cyclic hydrocarbon group; and a is 0 or 1).
Thermotropic copolyazomethines and process for preparing them
申请人:ENIRICERCHE S.p.A.
公开号:EP0322943A2
公开(公告)日:1989-07-05
Thermotropic copolyazomethines having a mesophase temperature range lying within a desired range of values are obtained by copolymerizing terephthalic aldehyde with at least two different 1,n-bis(4-aminophenoxy)alkanes.
Such copolya omethines are particularly useful as reinforcing materials for the usual thermoplastic polymers, such as polycarbonate, polybutyleneterephthalate, polyethyleneterephthalate and polyamides.
To provide a novel diamine, and a polyimide precursor and a polyimide using it. A diamine represented by the formula (1):
wherein each of X1 and X5 which are independent of each other, is a single bond or the like; each of X2 and X4 which are independent of each other, is —CH2— or the like; X3 is a C1-6 alkylene or the like; each of Y1 and Y2 which are independent of each other, is a single bond or the like; R is a C1-20 linear, branched or cyclic hydrocarbon group; and a is 0 or 1).