Aqueous autoxidisable coating composition
AssigneeDsm IP Assets B.V.
InventorsRonald Tennebroek, Gerardus Overbeek, Francisco Bergman, Mourad Aabich, Richard George Coogan, Roel Swaans
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Abstract
An aqueous coating composition comprising an autoxidisable polyester resin having ≧30 wt % of fatty acid residues; a Tg in the range of from −60° C. to +35° C.; an acid value greater than 15 mg KOH/g and less than 75 mg KOH/g; a Mw in the range of from 2,500 to 100,000 g/mol; said composition having a co-solvent content less that 15 wt % by weight of total composition; a solids content >30 wt %; and when a film, a telegraphing value of less than 20 gloss units.
Claims20
An aqueous coating composition comprising an autoxidisable polyester resin, said autoxidisable polyester resin having:
- i) >30 wt % of fatty acid residues;
- ii) a Tg in the range of from −60° C. to +35° C.;
- iii) an acid value greater than 15 mg KOH/g and less than 75 mg KOH/g;
- and
- iv) a Mw in the range of from 2,500 to 100,000 g/mol;
- said composition having:
- a) a co-solvent content 15 wt % by weight of total composition;
- b) a solids content >30 wt %;
- and
- said composition when in the form of the film having a telegraphing value of less than 20 gloss units;
- where the telegraphing value is the difference between an initial smooth gloss value minus an initial rough gloss value of the film, where
- the initial smooth gloss value is the gloss when the film is cast on smooth PVC (Rz=1 μm [±0.25 μm]);
- the initial rough gloss value is the gloss when the film is cast on rough PVC (Rz=25 μm [±5 μm]);
- and where
- each film has a dry film thickness of 52 μm [±6 μm];
- and
- each initial gloss value is measured at a 20° angle, one day (24 h) after the film has been cast.
Dependencies are inferred from the claim text.