Alkoxysilane and alkoxysilane terminated polyamic or polyimide l

Details Alkoxysilane and alkoxysilane terminated polyamic or polyimide l Alkoxysilane and alkoxysilane terminated polyamic or polyimide l

1989-07-10

1991-07-30

Marquis, Melvin I.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

528 26, 528 38, 549214, 548406, C08L 7700

Patent

active

050361457

ABSTRACT:
An alkoxysilane bearing amic acid or derivative thereof is formed by reacting an aromatic or aliphatic dianhydride and an aminoalkyltrialkoxysilane or aminoaryltrialkoxysilane, or reacting an aromatic or aliphatic dianhydride and a diamine to form an amic acid which is reacted with an aminoalkylenetrialkoxysilane. A thin, hard protective silica glass network is formed by reacting the alkoxysilane bearing amic acid with an alkoxysilane, preferably tetraalkoxysilane, and an epoxy bearing silane coupling agnet in an acid catalyzed sol-gel process involving hydrolysis and condensation, which provides an amide/ester modified silica network. In a variation of this process, a polyamic acid bearing anhydride termination is prepared by reacting an excess of a dianhydride with a diamine. The product of this reaction when reacted with an aminoalkylenetrialkoxysilane provides an alkoxysilane bearing oligomeric polyamic acid. The latter product yields an imide modified silica network when subjected to acid catalyzed hydrolysis and condensation with tetraalkoxysilane.

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Schmidt, H. K., Organically modified Silicates as Inorganic-Organic Polymers, Fraunhofer-Institut fur Silicatforschung, Wurzburg, FRG, pp. 102-103 23 Chemical Abstracts 18, 107:178273g, (1987).

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