Anhydrous gels and xerogels containing no hydroxyl groups, proce

Details Anhydrous gels and xerogels containing no hydroxyl groups, proce Anhydrous gels and xerogels containing no hydroxyl groups, proce

1995-08-21

1997-08-12

Lovering, Richard D.

Coating processes

Particles, flakes, or granules coated or encapsulated

Inorganic base

106450, 106452, 2523152, 501 12, 501102, 501103, 501106, B05D 700, B01J 1300

Patent

active

056563280

ABSTRACT:
Gels based on a network of oxygen-bridged metal and/or semi-metal atoms and produced using a hydrolytic sol-gel process are often not homogeneous. Known non-hydrolytic sol-gel processes give rise to gels containing halogen.
A novel non-hydrolytic sol-gel process has been found which gives rise to halogen-free and homogeneous gels and to xerogels obtainable therefrom.
In this process, one or more compounds (I) from the series of metal or semi-metal alkoxides, oxoalkoxides, amides or oxoamides are condensed, with elimination of carboxylic acid esters or carboxylic acid amides, until gelation occurs with one or more compounds (II) from the series of metal or semi-metal carboxylates or oxocarboxylates in an anhydrous organic solvent containing no hydroxyl groups.
Preferred gels and xerogels contain in the network metal or semi-metal atoms from main group and subgroup III to V and from the rare-earth elements.
The gels and xerogels may be used for the production of oxide ceramic materials and for encapsulating pigments.

REFERENCES:
patent: 4317668 (1982-03-01), Susa et al.
patent: 4539399 (1985-09-01), Armstrong
patent: 4816499 (1989-03-01), Nomura et al.
patent: 5122291 (1992-06-01), Wolff et al.
patent: 5270027 (1993-12-01), Balducci et al.
patent: 5384294 (1995-01-01), Teowee et al.
patent: 5403368 (1995-04-01), Takahashi et al.
patent: 5426082 (1995-06-01), Marsden
Corriu et al., Chemistry of Materials, vol. 4, No. 5 Sep.-Oct. 1992 pp. 961-963.
Database WPI, Derwent Publications Ltd. London Great Britain AN 92-362499 JP-A-04265 225 (Tsuchiya KK) (1992).

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