Liquid crystal polymer and film thereof

A liquid crystal polymer represented by the following formula (I):

• wherein D represents a n-valence connecting group;
• n represents an integer of 3 to 20;
• L1 represents a single bond or a bivalent connecting group;
• P represents a polymer having at least one ester bond and/or amide bond and having a weight-average molecular weight of 1,000 or more;
• m represents an integer that satisfies the relation of n≧m;
• R represents a hydrogen atom or a substituent;
• when a plurality of L1, a plurality of P, or a plurality of R are present in a molecule, they may be the same or different from each other;
• and P and P, or P and R may bond together,
• wherein P in formula (I) is a polymer having at least one recurring unit selected from the recurring unit group set forth below and having at least one ester bond and/or amide bond:
• (Recurring unit group)
• wherein, in formula (P1), L2 and L3 each independently represents a connecting group selected from the group consisting of —O—, —NH—, —CO—, —COO(CH2)2O—, —COO(CH2)4O—, and —COO(CH2)2CH(CH3)O—;
• the location of L3 is a para-position or a meta-position, relative to L2;
• and
• wherein, in formula (P2), X represents a connecting group selected from the group consisting of —O—, —C(CH3)2—, and —SO2—,
• wherein L1 in the formula (I) is any one of the following bivalent connecting groups:
• wherein R1 represents a hydroxyl group, a methyl group, or an ethyl group,
• wherein D in the formula (I) is a connecting group represented by any one of the following formulae (D-I) to (D-III):
• wherein in formula (D-I), V11 to V16 each independently represents a -L1-P group or —R group in the polymer of formula (I), a hydroxyl group, or an acyloxy group;
• and the connecting group represented by formula (D-I) has m1 number of the -L1-P group in the polymer of formula (I) and has (n1-m1) number of the —R group in the polymer of formula (I), in which n1 represents an integer of 3 to 6, and m1 represents an integer that satisfies the relation of n1≧m1;
• wherein, in formula (D-II), V21 to V23 each independently represents a -L1-P group or —R group in the polymer of formula (I), a hydroxyl group, an acyloxy group, an alkoxycarbonyl group, an amino group, or an acylamino group;
• k1, k2, and k3 each independently represents an integer of 0 to 5;
• and the connecting group represented by formula (D-II) has m2 number of the -L1-P group in the polymer of formula (I) and has (n2-m2) number of the —R group in the polymer of formula (I), in which n2 represents an integer of 3 to 15, and m2 represents an integer that satisfies the relation of n2≧m2;
• wherein, in formula (D-III), V31 to V33 each independently represents a -L1-P group or —R group in the polymer of formula (I), a hydroxyl group, an acyloxy group, an alkoxycarbonyl group, an amino group, or an acylamino group;
• k4 ,k5 and k6 each independently represents an integer of 0 to 5;
• and the connecting group represented by formula (D-III) has m3 number of the -L1-P group in the polymer of formula (I) and has (n3-m3) number of the —R group in the polymer of formula (I), in which n3 represents an integer of 3 to 15, and m3 represents an integer that satisfies the relation of n3≧m3.