Traditional artist hand-painted Reproduction
Oil Paintings are
oil-based wherein the oil is generally linseed oil. Such paints have been in
use for at least the past three centuries and continue to retain popularity.
Oil-based paints are often used in conjunction with a medium which allows the
artist to adjust the rheology of the paint and adjust the pigment/binder ratio.
It has long been recognized that whilst linseed oil-based artist paints have
many desirable properties, in use they suffer from two defects. An oil based
artist paint composition is disclosed in which a polymeric plasticizer is
included that acts to circumvent embrittlement of a dried paint film on ageing.
The invention has particular application to artists' paint compositions that
are linseed oil based.
A preferred plasticizer is poly butyl acrylate. A
polymeric plasticizer compound selected from the group consisting of an
acrylate polymer or copolymer, a soft resin copolymer, and a polyester, said
polymeric plasticizer compound being present in an amount effective to
plasticize said composition such that the weight ratio of said polymeric
plasticizer compound to oil varies. The first defect is a tendency to yellow.
This has been found to be controllable within acceptable limits by a careful
formulation. The second and most serious defect is that of an uncontrollable
tendency to become brittle with age. This defect is particularly acute in both
large and thickly painted oil abstract oil paintings. Two other problems
encountered in the use of artists' oil paints are shrinkage and
"creep".
Ageing oil paint films shrink as they age, and at a time
in their ageing cycle when they are already too brittle to accommodate such
movement without cracking. In order to circumvent these defects, the prior art
has provided acrylic artist figure oil paintings. It is notable that acrylic
paints have achieved considerable popularity and that these paints do not
suffer from the two defects of linseed oil-based artist paints. However,
acrylic paint does not possess the "feel" of traditional oil-based
artist paints. For that reason these paints are not generally used by
"serious" artists. Other attempts at meeting the embrittlement defect
have been based on discovering formulations that were used by the various
"oil masters". None of these attempts, to the present inventor's
knowledge, have proved satisfactory.
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