Pigment compositions and process of shading

Details Pigment compositions and process of shading Pigment compositions and process of shading

2002-01-09

2003-09-16

Green, Anthony J. (Department: 1755)

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

C106S495000, C106S497000, C106S498000, C106S410000, C106S411000

Reexamination Certificate

active

06620235

ABSTRACT:

The present invention relates to compositions comprising special pigments which meet BGVV specifications for food packaging materials.
It is the object of the present invention to provide a pigment composition which can be used for the shading of food packaging materials, especially such materials which are made of paper.
In one aspect, the invention relates to a composition comprising
a) a mixture of C.I. Pigment Violet 19 together with either C.I. Pigment Blue 15 or C.I. Pigment Blue 60,
b) a dispersant,
c) optionally a biocide, and
d) water.
One preferred form of this composition comprises a mixture of C.I. Pigment Violet 19 together with C.I. Pigment Blue 15, in which mixture the amount by weight of C.I. Pigment Violet 19 is greater than 50%, based on the weight of the mixture of pigments. The mixture of pigments contains usually 60% to 95% by weight, preferably 70% to 90% by weight, of C.I. Pigment Violet 19, based on the weight of the mixture of pigments. Particularly preferred are compositions wherein the mixture of pigments contains 75% to 85% by weight of C.I. Pigment Violet 19 and 15% to 25 % by weight of C.I. Pigment Blue 15.
A further preferred form of this composition comprises a mixture of C.I. Pigment Violet 19 together with C.I. Pigment Blue 15 or C.I. Pigment Blue 60, in which mixture the amount by weight of C.I. Pigment Violet 19 is less than 50%, based on the weight of the mixture of pigments. Particularly preferred compositions comprise a mixture of pigments containing C.I. Pigment Violet 19 together with C.I. Pigment Blue 60. The mixture of pigments contains usually 30% to less than 50% by weight, preferably 40% to less than 50% by weight of C.I. Pigment Violet 19, based on the weight of the mixture of pigments.
In a second aspect, this invention relates to a composition comprising
a) a mixture of C.I. Pigment Red 177 together with C.I. Pigment Blue 15 or C.I. Pigment Blue 60,
b) a dispersant,
c) optionally a biocide, and
d) water.
Particularly preferred are compositions that include a mixture of pigments containing C.I. Pigment Red 177 together with C.I. Pigment Blue 60. The mixture of pigments contains usually below 60% by weight, preferably below 50% by weight of C.I. Pigment Red 177, based on the weight of the mixture of pigments. Highly preferred are mixtures of pigments which contain 20 or 25 to 40% by weight of C.I. Pigment Red 177 and 60 to 75% by weight of C.I. Pigment Blue 60.
The compositions in all aspects of the invention contain preferably 0.1 to 40%, more preferably 10 to 30% of pigments, most preferably around 20% of pigments, based on the weight of the composition.
The size of the pigments can range from a few nanometres to several hundreds of microns. Preferred is an average size distribution of 0.01 to 1 micron.
The dispersant usually is present in the composition in an amount of 0.1 to 30%, preferably 0.1 to 8% by weight, most preferably 3 to 6%, based on the weight of the composition.
Preferred dispersants are for example polyacrylic acid, polymethacrylic acid, polymaleic anhydride, polyurethane, polyvinylether, polyvinylalcohol, polyalkylene glycol, polyethylene oxide, cellulose derivatives, polyimine, polyvinylpyridine, or copolymers thereof, or copolymers such as copolymers of acrylic acid with styrene, acrylonitrile, vinylacetate, vinylphosphonate, vinylpropionate, vinylchloride, itaconic acid or maleic anhydride, or a mixture thereof. Suitable polymeric derivatives are for example ethoxylated or propoxylated fatty amines such as ethoxylated cocoalkyl, oleyl or soyaalkyl amines; ethoxylated or propoxylated fatty quatemary salts such as ethoxylated cocoalkyltrimethyl ammonium chloride; ethoxylated fatty amides such as ethoxylated oleamides; alkyl-, cycloalkyl- or alkylaryl-oxypoly(ethylenoxy)ethanol, cycloalkyloxypoly(ethylenoxy)laurate or oleate, polyethylene glycol 400 laurate or oleate, alkyl-, cycloalkyl- or alkylaryl-poly(ethylenoxy)carboxylate or phosphonate. An especially preferred cycloalkyloxypoly(ethylenoxy) laurate or oleate is for example a poly(ethylenoxy)sorbitan laurate or oleate. Particularly preferred dispersants include polymers of aromatic sulphonic acids with formaldehyde, and salts thereof. Typically the dispersants have molecular weights in the range 1000 to 10,000, preferably 2,000 to 5,000, especially 2,500 to 3,500. These preferably water-soluble polymers, copolymers and/or polymer derivatives are known per se and are commercially available.
Preferably, the compositions contain a biocide. All FDA and BGVV compliant biocides are suitable for this application. Any of such biocide capable of inhibiting the growth of either or all of Gram positive or Gram negative bacteria, yeasts or fungi may be employed according to the present invention. Suitable biocides include thiazol-3-one derivatives, for instance alkyl and/or chlorinated derivatives of thiazol-3-one or mixtures thereof. Typically the biocide is present at levels of from about 15 parts per million (ppm) by weight of the composition to about 1000 ppm, most preferably from about 50 ppm to about 500 ppm by weight of the composition.
A further object of the present invention is to provide a process for the shading of paper wherein either of the above compositions or separate dispersions of said constituent pigments are applied to at least one stage of the paper making process.
Thus one aspect of the invention relates to a process for shading of paper to be used for food packaging material, which process comprises applying to at least one stage of the paper making process either
a) a composition comprising
i) a mixture of C.I. Pigment Violet 19 together with C.I. Pigment Blue 15,
ii) a dispersant,
iii) optionally a biocide, and
iv) water.
or
b) an aqueous dispersion of C.I. Pigment Violet 19 and an aqueous dispersion of C.I. Pigment Blue 15.
The aqueous pigment dispersions of C.I. Pigment Violet 19 comprises,
a) C.I Pigment Violet 19,
b) a dispersant,
c) optionally a biocide, and
d) water.
The aqueous pigment dispersion of C.I. Pigment Blue 15 comprises,
a) C.I Pigment Blue 15,
b) a dispersant,
c) optionally a biocide, and
d) water.
The preferences given before for the compositions also apply to the process for applying the compositions.
In one preferred form of the process of shading paper, a dispersion of C.I. Pigment Violet 19 and a dispersion of C.I. Pigment Blue 15 are applied to at least one stage of the paper making process, wherein the C.I. Pigment 19 is added in an amount of greater than 50% by weight of added pigments. The C.I. Pigment 19 is usually added in an amount of 60% to 95% by weight, preferably 70% to 90% by weight of the added pigments. In a particularly preferred form of the process C.I. Pigment Violet 19 is added in an amount of 75% to 85% by weight and C.I. Pigment Blue 15 is added in an amount of 15% to 25% by weight of C.I. Pigment Blue 15 based on the weight of the added pigments.
In another preferred form of the process a dispersion of C.I. Pigment Violet 19 and a dispersion of either C.I. Pigment Blue 15 or C.I. Pigment Blue 60 are added to at least one stage of the paper making process, wherein amount of C.I. Pigment Violet 19 used is less than 50% of the total amount of pigment used. The amount of C.I. Pigment Violet 19 used is usually 30% to less than 50% by weight, preferably 40% to less than 50% by weight, based on the weight of the pigments used.
A further aspect of the process of the invention relates to a process for shading of paper to be used for food packaging material, which process comprises applying at least one stage of the paper making process either
a) a composition comprising,
i) a mixture of C.I. Pigment Red 177 together with C.I. Pigment Blue 15 or C.I. Pigment Blue 60,
ii) a dispersant,
iii) optionally a biocide, and
iv) water,
or
b) an aqueous dispersion of C.I. Pigment Red 177 and an aqueous dispersion of either C.I. Pigment Blue 15 or C.I. Pigment Blue 60.
The aqueous pigment dispersions of C.I. Pigment Red 177 comprises,
a) C.I. Pigment Red 177,
b) a dispersant,
c) optionally a biocide, and
d) water.
The a

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