Photolabile polymers with metal-metal bonds

Details Photolabile polymers with metal-metal bonds Photolabile polymers with metal-metal bonds

1989-09-26

1992-03-10

Welsh, Maurice J.

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

Synthetic resins

From silicon reactant having at least one...

528 19, 528 44, 528 71, 528272, 528335, C08G 1830

Patent

active

050950843

ABSTRACT:
Polymers having photoreactive metal-metal bonds along the backbone of the polymer are disclosed, which bonds rendering the polymers photo-labile. Metals participating in such metal-metal bonds are from Groups VIB and VIIB (first column) of the Periodic Table as well as nickel. Each metal-metal bond is present in a cord group present in at least one monomer incorporated into the polymer. The core group also comprises carbonyl groups and an aromatic cyclopentadienyl (Cp) group bonded to each metal atom. Various organic and organosiloxane linker groups bonded to the Cp groups render the core group-containing monomer polymerizable into a composition of matter having physical properties determined in part by the chemical composition and conformation of the linkers. Reactions for synthesizing core groups, monomers, and various polymers therefrom are disclosed, including copolymerization reactions. Upon exposure to light, the metal-metal bonds in the polymers cleave, effecting more rapid degradation of the polymer than by other processes normally present in the environment.

REFERENCES:
O'Toole, T. R. et al., "Organometallic Photochemistry in Thin Polymeric Films, Photoimaging", J. Am. Chem. Soc. III, 5699-5706 (1989).
Meyer, T. J. and Caspar, J. V., "Photochemistry of Metal-Metal Bonds", Chem. Rev. 85:187-218 (1985).
Geoffroy and Wrighton, Organometallic Chemistry, Academic Press, N.Y. (1979), pp. 61-65, 82-87.
Gonsalves and Rausch, J. Polym. Sci., Part A: Polym. Chem. 26:2769-275 (1988).
Patterson et al., J. Polym. Sci., Polym. Chem. Ed. 12:837-850 (1974).
Birdwhistell et al., J. Organomet. Chem. 157:239-241 (1978).

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