collected and waste treated and this waste treatment adds cost to the process the present invention relates to the use of reactive tertiary amine catalysts such as 1 dimethylamino 2 propanol dimethylaminoethanol and methyldiethanolamine in place of regular tertiary amine catalysts such as triethylamine tea dimethylethylamine dmea dimethylisopropylamine dmipa and dimethylpropylamine dmpa wherein the reactive tertiary amine catalysts allow for the complete elimination of the amine waste stream to make the tertiary amine catalyst reactive it is structurally modified to contain a reactive function e g hydroxyl group that will allow it to be incorporated into the polyurethane polymer after the reactive tertiary amine is incorporated into the polyurethane binder it becomes non volatile i e its vapor pressure decreases to nearly zero and is removed from the vapor stream by matching the reactivity of the reactive tertiary amine catalyst to the process cycle time for a given core production operation one can insure that all of the catalyst amine which is introduced into the core box cavity is reacted with and incorporated into the sand resin cores being produced the term u201c reactive amine catalyst u201d refers to a molecule which contains both a tertiary amine moiety and a remote reactive group at least 2 carbons removed from the tertiary amine group which preferably is a reactive partially protonated heteroatom group e g hydroxy amino etc the reactive group is one that can take part in a condensation reaction e g urethane formation through addition to an isocyanate group generally a reactive group that can condense.