Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1993-09-14
1995-05-02
Bleutge, John C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524431, 524442, 525 61, 525431, 525100, 5253303, 5253297, 525903, 525389, 5253262, 5253315, 525342, 525446, 528 39, C08J 324, C08J 321, C08K 318, C08K 334
Patent
active
054120160
ABSTRACT:
Polymeric inorganic-organic compositions are obtained by intimately mixing a hydrolyzable precursor of an inorganic gel of silicon, titanium, or zirconium with an organic polymer and with an organic carboxylic acid having a pK.sub.a value of at most 4.0, present in an amount of at least 2 moles per mole of inorganic component, under conditions such that a homogeneous solution of all three components is initially formed, agitating the solution at 0.degree.-100.degree. C. until gelation of the inorganic component occurs, and recovering the inorganic-organic composition. Water need not be present as an initial reactant. Such compositions often are transparent, always have improved toughness, as compared with inorganic gels alone, and are believed to have a structure in which the organic polymer is entrapped in the inorganic gel in such an intimate manner that these two components cannot be separated from each other by physical means without destruction of the organic polymer.
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Sumio Sakka, Hiromitsu Kozuka and Sae-Hun Kim, Various Factors Affecting the Conversion of Silicon Alkoxide Solutions to Gels, Ultrastructure Processing of Advanced Ceramics, pp. 159-171, 1988.
Bradley K. Coltrain, Sharon M. Melpolder and John M. Salva, Effect of Hydrogen Ion Concentration on Gelation of Tetrafunctional Silicate Sol-Gel Systems, Ultrastructure Processing of Advanced Materials, pp. 69-76, 1992.
Derwent Publications Ltd., London, GB;AN92-304145 & JP,A, 4 209 606 (31 Jul. 1992).
Bleutge John C.
E. I. Du Pont de Nemours and Company
Glass Margaret W.
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