Oil based paint
OwnerJames C. Cobbinventor
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Abstract
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. In a preferred embodiment, alkyd resins are included in the composition to reduce the tendency of paint films to shrink on ageing and "creep" when used in very heavy impasto applications.
Claims18
An improved oil-based artist paint composition exhibiting reduced embrittlement on aging, said composition comprising:
- an oil selected from the group consisting of linseed oil, rape seed oil, soya, cottonseed, sunflower oil and safflower oil,
- a pigment,
- an extender, and
- a polymeric plasticizer compound selected from the group consisting of an acrylate polymer or copolymer, a soft resin copolymer, an epoxidized oil 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 according to the oil absorbency of said pigment and is in the range of from 7:93 to 33.3:100.
A medium composition for use with an oil-based artist paint comprising:
- a solvent;
- at least one alkyd resin which is thixotropic and is present in an amount effective to aid through drying of oil in an oil-based artist paint;
- and
- a polymeric plasticizer compound selected from the group consisting of an acrylate polymer or copolymer, a soft resin copolymer, an epoxidized oil and a polyester, effective to plasticize an oil-based artist paint and in an amount such that when the medium composition is used with an oil-based artist paint, the weight ratio of said polymeric plasticizer compound to oil will be in the ratio of 7:93 to 33.3:100;
- said medium composition having a resin solids content of from 33 to 60.9%.
Dependencies are inferred from the claim text.