Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Making electrical device
Patent
1982-09-29
1984-06-12
Brammer, Jack P.
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Making electrical device
430 18, 430283, 430288, 430916, 430919, 20415916, 20415918, 20415919, G03C 500
Patent
active
044542208
ABSTRACT:
An electrical device coated with a polymerized polyimide structure resulting from a radiation-sensitive polyimide precursor composition which comprises a polymer of the formula ##STR1## wherein n is a positive integer corresponding to the number of units in the polymer and is sufficiently large to provide the polymer with a number average molecular weight of about 1500-15,000 as determined by vapor pressure osmometry, and wherein for any particular unit in the polymer:.fwdarw.denotes isomerism; R.sup.1 is a divalent aromatic, aliphatic or cycloaliphatic radical containing at least 2 carbon atoms; R.sup.2 and R.sup.3 are selected from the group consisting of a hydrogen radical and any organic radical containing a photopolymerizable olefinic double bond; and R.sup.4 and R.sup.5 are selected from the group consisting of perfluoro and perhalofluoro aliphatic hydrocarbons having 1 to 8 carbons.
REFERENCES:
patent: 3479185 (1969-11-01), Chambers
patent: 3957512 (1976-05-01), Kleenberg et al.
patent: 4271259 (1981-06-01), Breslow et al.
patent: 4310641 (1982-01-01), Ohmura et al.
patent: 4311785 (1982-01-01), Ahne et al.
Brammer Jack P.
E. I. Du Pont de Nemours and Company
Thrower William H.
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