PURPOSE: To obtain a molded material having excellent mechanical strength, excellent molding and processing property without lowering mechanical strength in co-using with other hydrophobic resin and useful for fibers, a film, a tube ore a drip-proof film, etc., by including a specific modified PVA-based resin.

CONSTITUTION: This molded material contains a PVA-based resin comprising a copolymer containing (A) 0.1-20mol% a compound of the formula [R1 is H or methyl; R2-R4 are each an alkyl or an aryl; R5 is H or R2; total number of C in R2-R5 is ≥4] (e.g. N-tert-octylacrylamide) and (B) 0.1-20mol% an ethylenic unsaturated carboxylic acid (salt) [e.g. (meth)acrylic acid, a maleic acid monoester] as copolymer components. This molded material can contain together with a polyamide-based resin, a polyolefin-based resin, a polyester-based resin or a PVC-based resin, etc., as a hydrophobic resin.