Cytec Technology Corporation

American Cyanamid Company

Ciba Specialty Chemicals Corporation

Venkatrao K Pai

Ram Baboo Gupta

Dennis John Jakiela

Russell C Cappadona

Sampath Venimadhavan

Joseph F Skrivan

Robert E Barnes, Jr

It has been now surprisingly discovered after extensive research that 2-halo-4,6-bisaryl-1,3,5-triazine can be prepared with unprecedented selectivity, efficiency, mild conditions, and in high yield by the reaction of cyanuric halide with aromatics in the presence of at least one Lewis acid and at least one reaction promoter. This reaction is also unprecedently general as a variety of aromatics can be used to produce a wide selection of 2-halo-4,6-bisaryl-1,3,5-triazines. The novel approach includes the use of the reaction promoters in combination with at least one Lewis acid under certain reaction conditions to promote the formation of 2-halo-4,6-bisaryl-1,3,5-triazine compounds from cyanuric halide. Preferably, the Lewis acids and reaction promoters are combined to form a complex 2-Halo-4,6-bisaryl-1,3,5-triazines are key intermediates for making 2-(2-oxyaryl)-4,6-bisaryl-1,3,5-triazine class of UV absorbers.

Process for making trisaryl triazine UV absorbers using Lewis acids and reaction promoters

It has been now surprisingly discovered after extensive research that 2-halo-4,6-bisaryl-1,3,5-triazine can be prepared with unprecedented selectivity, efficiency, mild conditions, and in high yield by the reaction of cyanuric halide with aromatics in the presence of at least one Lewis acid and at least one reaction promoter. This reaction is also unprecedently general as a variety of aromatics can be used to produce a wide selection of 2-halo-4,6-bisaryl-1,3,5-triazines. The novel approach includes the use of the reaction promoters in combination with at least one Lewis acid under certain reaction conditions to promote the formation of 2-halo-4,6-bisaryl-1,3,5-triazine compounds from cyanuric halide. Preferably, the Lewis acids and reaction promoters are combined to form a complex. 2-Halo-4,6-bisaryl-1,3,5-triazines are key intermediates for making 2-(2-oxyaryl)-4,6-bisaryl-1,3,5-triazine class of UV absorbers.

Process for making triazine UV absorbers using lewis acids and reaction promoters

Process for making triazine UV absorbers using Lewis acids and reaction promoters

The invention provides new processes for preparing compositions containing at least one triazine compound, including new compounds for use in these processes to form the compositions and the new compositions that are formed.

Process for making 2-hydroxy-4-alkoxyphenyl or 2,4-dihydroxyphenyl substituted 1,3,5-triazine UV absorbers

The invention relates to a novel process for making 2-(2-hydroxy-4-alkoxyphenyl)-4,6-bisaryl-1,3,5-triazine and 2-(2,4-dialkoxyphenyl)-4,6-bisaryl-1,3,5-triazine compounds directly from 2-chloro-4,6-bisaryl-1,3,5-triazine compounds with 3-alkoxyphenol, 1,3-dialkoxylbenzene compounds or mixtures thereof. The reaction step to prepare 2-chloro-4,6-bisaryl-1,3,5-triazines from the reaction of cyanuric chloride with substituted aromatic compounds can be combined with the addition reaction of 3-alkoxyphenol or 1,3-dialkoxylbenzene in a two-step, one-pot process. The 2-(2-hydroxyl-4-alkoxyphenyl)-4,6-bisaryl-1,3,5-triazine, and 2-(2,4-dialkoxyphenyl)-4,6-bisaryl-1,3,5-triazine compounds, are useful to stabilize materials against damage by light, heat, and oxygen, and as stabilizers for organic material, or mixtures thereof.

Process for making 2-(2-hydroxy-4-alkoxyphenyl)-4,6-bisaryl-1,3,5-triazines

Provided is a new process for the preparation of compositions containing at least one triazine ultraviolet light absorber.

Process for making 2-(2,4,-dihydroxyphenyl) or 2-(2,4-dialkoxyphenyl)-4,6-bisaryl-1,3,5-triazines

The manufacture of a substantially fully methylated, substantially fully methylolated melamine composition is carried out by a continuous process in which the methylolation of melamine is conducted in two stages, the first stage being effected at an acidic pH and the second stage being effected at an alkaline pH. The reaction mixture is then concentrated and reacted with methanol after which all of the unreacted volatiles and precipitated salts are removed to provide the product composition.

Continuous process for manufacturing substantially fully methylated

For making low density alumina or silica-alumina beads as catalyst support particles for auto-exhaust catalysts, hollow glass spheres of very small diameter are incorporated in the alumina powder mix before it is formed into beads and calcined. The beads may be finished with a surface coat of alumina without the microspheres to improve resistance to abrasion. Preferred beads are made with rehydratable alumina powder.

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Stamford, CT, United States of America

Venkatrao K Pai