KUPFER-ENTHALTENDE PHOSPHORSÄUREESTER-DERIVATE UND VERFAHREN ZU IHRER HERSTELLUNG, NAHINFRAROT-ABORBER, UND IM NAHINFRAROT ABSORBIERENDE ACRYLHARZZUBEREITUNGEN

Disclosed herein are a novel phosphate compound by which a copper ion can be dispersed in a high proportion in a synthetic resin, thereby providing a resin composition which has excellent visible ray-transmitting property and performance that near infrared rays are absorbed with high efficiency, and is little in the deterioration of its near infrared ray-absorbing ability by ultraviolet rays, and a preparation process thereof, a phosphate copper compound obtained from the phosphate compound and a preparation process thereof, and a near infrared ray-absorbing acrylic resin composition which has excellent visible ray-transmitting property and performance that near infrared rays are absorbed with high efficiency and is little in the deterioration of its near infrared ray-absorbing ability by ultraviolet rays. The phosphate compound of the invention is represented by the following formula (1). The phosphate copper compound of the invention is obtained by reacting the phosphate compound represented by the following formula (1) with a copper salt. wherein groups R independently mean a group represented by the following formula (2) or (3), and n is 1 or 2: wherein R denotes an alkyl group having 1 to 20 carbon atoms, R represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and m is an integer of 1 to 6.