Curable liquid compositions
AssigneePQ Silicas UK Limited
InventorsGemma Morea, Alan Reginald Minihan
Life of this patent
Estimating the term…
Abstract
A curable liquid composition, such as an alkyd paint or resin, contains a binder curable by oxidative crosslinking, a siccative compound for catalysing oxidative crosslinking of the binder, and a matting agent. The matting agent is a precipitated silica, with a surface area, measured by BET, of 250 m2/g or less, a precipitated metal silicate such as Ca, Mg or Al silicate, or a mixture, and may be amorphous in nature. The siccative compound is a transition metal chelate complex comprising a ligand, such as an iron- or a manganese-based chelate complex. The compositions are capable of oxidative curing, within acceptable times, to form a cured solid, such as a coating, having a matt finish.
Claims25
A curable liquid composition comprising:
- a) a binder curable by oxidative crosslinking,
- b) a siccative compound adapted to catalyse oxidative crosslinking of the binder, and
- c) a matting agent,
- characterised in that the siccative compound is a transition metal chelate complex comprising a ligand, and
- the matting agent is:
- a precipitated silica having a surface area of 250 m2/g or less, preferably 200 m2/g or less, as measured by BET,
- a precipitated metal silicate, or
- a mixture thereof.
(canceled)
The method of claim 25 wherein the binder is, or comprises an alkyd resin and wherein the curable liquid composition is a water-based paint, a solvent-based paint, a varnish, a wood stain, or an ink.
The method of claim 25 wherein the matting agent has a surface area of 70 m2/g or less, and wherein the curable liquid composition is free from, or comprises 0.1% by weight or less, of amorphous silica having a surface area greater than 70 m2/g, as measured by BET.
The method of claim 25 wherein the matting agent is selected from amorphous precipitated aluminium silicate, amorphous precipitated calcium silicate, amorphous precipitated magnesium silicate or mixtures thereof, preferably amorphous precipitated aluminium silicate.
A method of coating a surface comprising applying to the surface a curable liquid composition comprising:
- a binder curable by oxidative crosslinking, and
- a transition metal chelate complex comprising a ligand as a siccative compound adapted to catalyse oxidative crosslinking of the binder, and curing the liquid composition wherein the curable composition incorporates a matting agent which comprises a precipitated silica having a surface area of 250 m2/g or less, preferably 200 m2/g or less, as measured by BET,
- a precipitated metal silicate, or
- a mixture thereof.
Dependencies are inferred from the claim text.