Dope composition, polarizing plate protective film, polarizing plate protective film manufacturing method, polarizing plate, and liquid crystal display device

A dope composition, containing:

• an acrylic resin having a weight average molecular weight of greater than or equal to 250,000;
• and
• a drying additive having a weight average molecular weight of less than 50,000,
• wherein the acrylic resin is formed only of a methyl methacrylate unit a,
• wherein the drying additive contains a phenol-based compound denoted by General Formula (1) described below;
• and
• in General Formula (1), R1 and R4 each independently represent a hydrogen atom, a methyl group, or a t-butyl group, R2 and R3 each independently represent a hydrogen atom or a methyl group;
• X represents a divalent organic group formed of a combination of two or more groups selected from the group consisting of —CH2—, —CO—, —O—, and —NR5—, R5 represents a hydrogen atom or an alkyl group;
• Y represents a hydrogen atom, a carbon atom, a sulfur atom, an aromatic hydrocarbon group, or a hetero ring;
• and n represents an integer of 1 to 4,
• wherein the drying additive contains a styrene-based copolymer having a structure unit denoted by General Formula (2) described below and a structure unit denoted by General Formula (3) or (4) described below:
• in General Formula (2), R6 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and R7 represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 4 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and an alkyl carbonyl oxy group having 1 to 4 carbon atoms;
• and in General Formula (3), R8 represents a hydrogen atom or a methyl group, and R9 represents a hydrogen atom or an alkyl group having 1 to 20 carbon atoms, and
• wherein the drying additive contains a novolak resin having a structure unit denoted by General Formula (5) described below:
• in General Formula (5), R10 represents a hydroxyl group or an alkoxy group having 1 to 2 carbon atoms, and R11 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms.