Ketone-aldehyde modified resin and the preparation process thereof

A process for preparation of a ketone-aldehyde modified resin, comprising the steps of:

• providing an unsaturated polyester-forming and/or unsaturated alkyd resin-forming monomer components;
• providing a ketone-aldehyde resin,
• reacting the monomer component with the ketone-aldehyde to obtain the ketone-aldehyde modified resin, wherein the monomer components comprise (a) 20 to 60 wt. % of polyols;
• (b) 20 to 60 wt. % of polyacids;
• (c) 0 to 50 wt. % of fatty acids, fatty acid esters or naturally occurring oils;
• and (d) 0 to 15 wt. % of monofunctional acids other than fatty acids,
• wherein based on the total weight of the monomer components and the ketone-aldehyde resin, the ketone-aldehyde resin is present in an amount of from 1 wt. % to 99 wt. %,
• wherein the wt. % is relative to the total weight of components of (a), (b), optional (c), and optional (d);
• and at least one of components (b) and (c) is unsaturated;
• wherein the molar equivalent ratio of the polyols to the sum of the polyacids, optionally the fatty acids, fatty acid esters or naturally occurring oils and optionally the monofunctional acids is in a range of 1:4 to 4:1.