Patent ID: 6017981
Filing Date: 2000-01-25
Classification: C04B,C09D

Abstract:
Coating material having reflective properties in two wavelength ranges and absorbent properties in a third wavelength range, comprising:a) a binder having transparency greater than 40% in the wavelength ranges of from 0.4 to 0.7 .mu.m and from 10 to 50 .mu.m and a refractive index n in the said wavelength ranges less than 2.0;b) 20 to 30 percent by weight, based on the wet weight of the coating material, of flaky first particles having a thickness less than 10 .mu.m and a surface area (length.times.width) greater than 100 .mu.m.sup.2 and a reflectivity R greater than 40% in the wavelength range of from 10 to 50 .mu.m; andc) second particles at least partially overlapping the first particles, which second particles have a transparency greater than 40% only in the wavelength ranges of from 0.4 to 0.7 .mu.m and from 10 to 50 .mu.m, but an absorption greater than 20% in the wavelength range of from 1.0 to 2.0 .mu.m, as well as a refractive index in the wavelength range of from 0.4 to 0.7 .mu.m greater than that of the binderthe size of the second particles being selected such that there is an optimum back scattering and thus reflective effect in the wavelength range of from 0.4 to 0.7 .mu.m.