Dimerized thiourea derivatives near-infared absorbents comprisin

Details Dimerized thiourea derivatives near-infared absorbents comprisin Dimerized thiourea derivatives near-infared absorbents comprisin

1996-04-19

1998-03-03

Tucker, Philip

Compositions

Light transmission modifying compositions

Infrared

564 23, 564 26, 564 27, 564 29, F21V 904, C07C30300, C07C33500

Patent

active

057230757

ABSTRACT:
A near-infrared absorbent is obtained by heating a dimerized thiourea ##STR1## The near-infrared absorbent is used to obtain a near-infrared absorbent resin material having a wide absorption in the near-infrared region, and the absorbent does not substantially decompose at a molding temperature of the resin. Typical examples of the dimerized thiourea derivative are 4,4'-di(benzylthiocarbamoyl)-aminodiphenylmethane, 4,4'-di(benzylthiocarbamoyl)-aminodiphenylhexafluoropropane, and 1,4'-di(dibenzoylthiocarbamoylamino)-2,5-dimethylbenzene, and typical examples of the copper compound are copper stearate and copper .beta.-acryloyloxypropylhydrogenphthalate.

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