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A process for producing a polymer having crosslinked structure, which comprises reacting a polymer having in the molecule a partial structure of the formula: [Figure] with an oxazoline derivative of the general formula: [Figure] wherein n is an integer of 1 to 4; R is an n-valent aromatic hydrocarbo

A process for producing a polymer having crosslinked structure, which comprises reacting a polymer having in the molecule a partial structure of the formula: [Figure] with an oxazoline derivative of the general formula: [Figure] wherein n is an integer of 1 to 4; R is an n-valent aromatic hydrocarbon radical; R1, R2, R3 and R4 are respectively the same or different hydrogen or alkyls having not more than 3 carbon atoms. The polymer shows an excellent adherence, and is of great industrial value as coatings, adhesives and molding materials with by far improved heat and solvent resistance.

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A process for producing a polymer having a crosslinked structure, which comprises reacting a polymer having in its molecule a partial structure of the formula: [Figure] with an oxazoline derivative of the formula: [Figure] wherein R is a di-valent aromatic hydrocarbon radical, and R1, R2, R3 and R4,

A process for producing a polymer having a crosslinked structure, which comprises reacting a polymer having in its molecule a partial structure of the formula: [Figure] with an oxazoline derivative of the formula: [Figure] wherein R is a di-valent aromatic hydrocarbon radical, and R1, R2, R3 and R4, which may be the same or different, are hydrogen or alkyl having not more than 3 carbon atoms, the ratio of the number of the oxazoline rings in the oxazoline derivative relative to each one of the partial structures of the formula: [Figure] in the polymer being within the range of about 1.5 to 3.0.