There is provided an aromatic hydrocarbon formaldehyde resin obtained by reacting an aromatic hydrocarbon compound (A) represented by the following formula (1) with formaldehyde (B) in the presence of an acidic catalyst. ##STR00001##
wherein R represents an organic group having 1 to 10 carbon atoms; l represents an integer of 0 to 2, and m and n represent integers satisfying 1≦m+n≦10, m≧0 and n≧1.

There is provided an aromatic hydrocarbon formaldehyde resin obtained by reacting an aromatic hydrocarbon compound (A) represented by the following formula (1) with formaldehyde (B) in the presence of an acidic catalyst. ##STR00001##
wherein R represents an organic group having 1 to 10 carbon atoms; l represents an integer of 0 to 2, and m and n represent integers satisfying 1≦m+n≦10, m≧0 and n≧1.

A process for the manufacturing of copoly mers of aldehydes, vinyl ethers, and certain copolymers of aldehydes and vinyl ethers can be performed. The copolymerisation is carried out in the presence of at least one reactive boron trihalide complex, and optionally, in the presence of at least one Bronsted Acid and/or Lewis Base.

A process for the manufacturing of copoly mers of aldehydes, vinyl ethers, and certain copolymers of aldehydes and vinyl ethers can be performed. The copolymerisation is carried out in the presence of at least one reactive boron trihalide complex, and optionally, in the presence of at least one Bronsted Acid and/or Lewis Base.