Dsm IP Assets B.v.

Jan Bouman

Gerardus Cornelis Overbeek

Ronald Tennebroek

Tijs Nabuurs

John Geurts

Rajasingham Satgurunathan

Aqueous coating composition comprising a blend of 20 to 60 wt % of a multistage vinyl polymer (A) comprising 5 to 40 wt % of at least one hard polymer stage (i) having a Tg&#x2267;50&#xb0; C. and 95 to 60 wt % of at least one soft polymer stage (ii) having a Tg&#x2266;&#x2212;5&#xb0; C.; and 80 to 40 wt % of a vinyl oligomer-polymer (B) comprising 15 to 50 wt % of at least one alkaline soluble oligomer (iii) and 85 to 50 wt % of at least one vinyl polymer (iv) having a Tg in the range of from &#x2212;20 to 30&#xb0; C.

Aqueous vinyl coating compositions

An aqueous coating composition with an improved open time comprising (a) a crosslinkable water-dispersible oligomer(s); (b) a dispersed polymer(s), (c) a pigment(s) with an oil absorption number &#x2266;25 g oil/100 g pigment and optionally (d) a Newtonian-like thickener(s) and (e) a thixotropic thickener(s) wherein the weight ratio of (a):(b) is in the range of from 10:90 to 60:40; wherein (d)+(e)=0.1 to 10 wt % and wherein said composition when drying to form a coating has a tack-free time of &#x2266;24 hours.

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Jan Bouman