Stabilization of photochromic compounds, and the use of stabiliz

Details Stabilization of photochromic compounds, and the use of stabiliz Stabilization of photochromic compounds, and the use of stabiliz

1982-07-06

1985-03-05

Morris, Theodore

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

106 21, 10628717, 1062872, 10628721, 524 89, 524104, 524112, 524447, 252600, C09D 1100, C09K 534

Patent

active

045031770

ABSTRACT:
The stabilization of selected photochromic compounds, selected from certain fulgides and fulgimides, is made possible by associating with such compounds a clay mineral having an expanding crystal lattice, which can stabilize a selected photochromic compound in a higher-energy colored form. The stabilized photochromic compound may be one included in a coating composition, such as a paper coating composition, or may constitute or be incorporated in a filler for a papermaking furnish or for a plastics material. The stabilizer serves to maintain the photochromic compound in its higher-energy colored state or one of its higher-energy colored states, thereby tending to prevent deterioration of color as the photochromic compound converts to an uncolored or weakly colored lower-energy state.

REFERENCES:
patent: 3322542 (1967-05-01), Ullman
patent: 3377170 (1968-04-01), Giddings
patent: 3825427 (1974-07-01), Inoue et al.
patent: 4012232 (1977-03-01), Uhlmann et al.
patent: 4026883 (1977-05-01), Farber
patent: 4145536 (1979-03-01), Holler
Chem. Abstract, 92:50102e, Plessey, May 2, 1979.

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