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US 4,051,163 AGranted
Polyimide containing silicones
OwnerAbe Bergerinventor
Life of this patent
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Abstract
A copolymer which is the reaction product of a tetracarboxylic acid dianhydride, and organic diamine and a di(aminoalkyl) poly siloxane where the di(aminoalkyl) poly siloxane constitutes 18-45 mole percent of the total amine requirement of the polymer and is applicable as a conformal protective coating for electronic devices.
Claims5
A reaction product of a tetracarboxylic acid dianhydride, an organic diamine and a di(aminoalkyl) polysiloxane which is a copolymer having recurring structural units of a block copolymer of the formulas :
- ##STR8## wherein:
- R is a divalent hydrocarbon radical;
- R' is a monovalent hydrocarbon radical;
- R" is a tetravalent organic radical;
- Q is a divalent organic radical which is a residue of an organic diamine
- x is an integer having a value of from 1 to 10;
- m is an integer greater than 1, and
- n is an integer greater than 1.
- p is an integer greater than or equal to 0.
- and the recurring units designated by m, n, and p are such that the mole percent of silicone diamine in the total polymer constitutes 18 to 45 mole percent of the total diamines in the copolymer.
7 more elements
Dependencies are inferred from the claim text.