Soluble polyimide-siloxane precursor, process for producing same

Details Soluble polyimide-siloxane precursor, process for producing same Soluble polyimide-siloxane precursor, process for producing same

1985-09-24

1987-04-07

Hoke, Veronica P.

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

Synthetic resins

From silicon reactant having at least one...

525436, C08G 7754

Patent

active

046562389

ABSTRACT:
A novel soluble polyimide-siloxane precursor useful for forming a superior coating on silicon wafer, glass, etc. and a process for producing the same are provided, which precursor has an imide-amic acid chain part expressed by --R.sup.3 --(I)--R.sup.2 --(I)].sub.n R.sup.3 --, bonded by a bonding structure expressed by --SiR.sup.4.sub.3-m Y.sup.1.sub.m-1 --O--SiR.sup.4.sub.3-m Y.sup.1.sub.m-1 --, wherein (I) is either one of formulas (2), (3) or (4) ##STR1## wherein R.sup.1 is a tetravalent carbocyclic aromatic group; R.sup.2, R.sup.3, R.sup.4 and Y.sup.1 each are a specified group; 1.ltoreq.m.ltoreq.3; the precursor further being terminated by Y.sup.2.sub.m R.sup.4.sub.3-m Si-- wherein Y.sup.2 is a specified group and having a percentage imidization as defined relative to the quantities of (2), (3) and (4), of 50-100% and also an inherent viscosity as specifically defined, of 0.05 to 5 dl/g, the above n being an integer defined so as to give the above inherent viscosity value.

REFERENCES:
patent: 3948835 (1976-04-01), Greber et al.
patent: 3950308 (1976-04-01), Greber et al.

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