The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 07, 1987
Filed:
Sep. 24, 1985
Kouichi Kunimune, Ichiharashi, JP;
Yoshiya Kutsuzawa, Yokohamashi, JP;
Shiro Konotsune, Yokosukashi, JP;
Chisso Corporation, Osaka, JP;
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.