Heat absorbing additives
AssigneeDatalase Ltd.
InventorsMarc Mamak, Urs Lehmann, Ralf Knischka, Francesca Peri, Adolf Käser
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Abstract
The invention relates to a powder composition comprising particles of a) an alkali metal tungsten bronze, b) tungsten oxide, and c) tungsten metal, a method for the preparation of said powder composition, and to the use of said powder composition in form of a dispersion in a polymer material or article for heat shielding, or to increase the heat-input amount of near infrared radiation in processes selected from laser welding of plastics, NIR curing of coatings, drying of printing inks, fixing of ink toners to a substrate, heating of plastic performs, laser marking of plastics or paper.
Claims15
Powder composition comprising:
- (a) an alkali metal tungsten bronze;
- (b) a binary tungsten oxide;
- and
- (c) tungsten metal;
- wherein the composition comprises
- 25-95 parts by weight of the alkali metal tungsten bronze of the formula WO3-zMex, where Me is selected from Cs, Na and K, x ranges from 0.2 to 1, and z ranges from 0 to x;
- 4-60 parts by weight of the binary tungsten oxide;
- and
- 1-15 parts by weight of tungsten metal.
Powder composition comprising:
- (a) an alkali metal tungsten bronze;
- (b) a binary tungsten oxide;
- and
- (c) tungsten metal;
- wherein the composition comprises on 100 parts by weight of the total powder composition,
- 70-98 parts by weight of the alkali metal tungsten bronze of the formula WO3-zMex, where Me is selected from Cs, Na and K;
- x ranges from 0.2 to 1, and z ranges from 0 to x;
- 1-15 parts by weight of the binary tungsten oxide;
- and
- 1-15 parts by weight of tungsten metal.
Dependencies are inferred from the claim text.