초록

This invention relates to 1,4-diketopyrrolo[3,4c]-pyrrole pigments of the formula characterized by desirable color properties and novel visible absorbance spectra with a steep slope on the bathochromic side of the absorption maximum in the range of from 500 to 650 nm.

대표청구항 ▼

1. A pigment of the formula having an absorption maximum in the area from 400 to 700 nm, wherein a 50% by weight dispersion thereof in a methacrylic resin, applied as a film of thickness such that the absorption maximum in the area from 400 to 700 nm has an intensity of 1.0±0.1, said absorption maxi

1. A pigment of the formula having an absorption maximum in the area from 400 to 700 nm, wherein a 50% by weight dispersion thereof in a methacrylic resin, applied as a film of thickness such that the absorption maximum in the area from 400 to 700 nm has an intensity of 1.0±0.1, said absorption maximum occurring at a wavelength of from 556 to 596 nm. 2. A pigment according to claim 1, wherein said absorption maximum occurs at a wavelength of from 557 to 565 nm.3. A pigment according to claim 1 having a maximum slope on the bathochromic side of the absorption maximum, which reaches at least a 5% change in absorption per 1 nm change in wavelength, based on the absorption at the absorption maximum.4. A pigment according to claim 1, having a maximum slope on the bathochromic side of the absorption maximum which reaches at least a 5.5% change in absorption per 1 nm change in wavelength, based on the absorption at the absorption maximum.5. A 1,4-diketopyrrolo[3,4c]-pyrrole pigment of the formula optionally containing other 1,4-diketopyrrolo[3,4c]-pyrroles selected from the group consisting of Pigment Red 255, Pigment Red 264, 3,6-di(4′-cyanophenyl)-2,5-dihydropyrrolo[3,4′-c]pyrrole-1,4-dione and 3-phenyl-6-(4′-tert-butylphenyl)-2,5-dihydropyrrolo-1,4-dione, having an absorption maximum in the area from 400 to 700 nm with said absorption maximum exhibiting a maximum slope on the bathochromic side of said absorption maximum in the range from 500 to 850 nm, wherein a 50% by weight dispersion thereof in a methacrylic resin, applied as a film of thickness such that the absorption maximum in the area from 400 to 700 nm has an intensity of 1.0±0.1, the slope on the bathochromic side of the absorption maximum in the range from 500 to 650 nm reaches at least a 5% change in absorption per 1 nm change in wavelength, based on the absorption at said absorption maximum. 6. A 1,4-diketopyrrolo[3,4c]-pyrrole pigment according to claim 4, wherein the maximum slope on the bathochromic side of the absorption maximum in the range from 500 to 650 nm reaches at least a 5.5% change in absorption per 1 nm change in wavelength, based on the absorption at said absorption maximum.7. A 1,4-diketopyrrolo[3,4c]-pyrrole pigment according to claim 5, containing only a 1,4-diketopyrrolo[3,4c]-pyrrole of formula II.8. A 1,4-diketopyrrolo[3,4c]-pyrrole pigment according to claim 6, containing only a 1,4-diketopyrrolo[3,4c]-pyrrole of formula II.