Inventors:
Ronald N. Hubbard - Encinitas CA
Terry D. Gulden - La Jolla CA
Michael T. Martin - Lakeside CA
Assignee:
General Atomics - San Diego CA
International Classification:
C09C 100
C09C 104
C09C 124
C09C 128
C09C 136
Abstract:
Optical coating compositions containing thin film particulates or pigments that are capable of imparting to the coating preselected optical characteristics or properties, such as selective reflectance, transmission and absorptance of light energy, are comprised of film forming binder and improved high volume pigment particles dispersed in the binder. Each pigment particle is a high volume flake comprised of an inorganic or polymer core having two sides and a thin film optical structure deposited onto each of the two sides of the core. The core occupies a large volume of the coating composition and dramatically reduces the number of flakes and the amount of thin film structures required to produce a coating of given thickness and desired optical properties. The core may also be fabricated to have diffuse and irregular side surfaces in order to render the applied coating visually diffuse and nonspecular. Methods of making the pigment particles are disclosed.