Resin composition

A resin composition comprising a polymer and at least 5% by weight of an ester compound, wherein the ester compound and the polymer are obtained by reacting a polycyclic hydrocarbon diene, a dienophile and a rosin acid, a derivative of a rosin acid or a mixture thereof, wherein the resin composition has an acid number below about 50.

A resin composition comprising at least 5% by weight of an ester compound, and a polymer, wherein the ester compound and the polymer are obtained by reacting a polycyclic hydrocarbon diene, styrene and a rosin acid, a derivative of a rosin acid, or a mixture thereof.

An adhesive composition comprising a resin composition, wherein the resin composition comprises at least 5% by weight of an ester compound, the resin composition also comprises a polymer, wherein the ester compound and the polymer are obtained by reacting a diene, a dienophile and a carboxylic acid.

A method for producing a resin composition which comprises providing a reaction mixture comprising up to about 75% by weight of a diene, up to about 55% by weight of a dienophile, and from about 10 to about 75% by weight of a carboxylic acid, heating the reaction mixture at a temperature from about 175° C. up to about 310° C. for about 1 up to about 2 hours.