Film prepared from a casting composition comprising a polymer and surface modified hexagonal boron nitride particles
AssigneeE. I. Du Pont de Nemours and Company
InventorsPui-Yan Lin, Govindasamy Paramasivam Rajendran, George Elias Zahr
Life of this patent
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Abstract
Provided is a film having a thickness of less than 500 μm comprising a polymer and a plurality of surface-modified hexagonal boron nitride particles dispersed therewithin. The polymers can be polyimide or epoxy. A process for preparing the film by casting is provided.
Claims15
A film having a thickness of less than 500 μm comprising a polymer and a plurality of surface-modified hexagonal boron nitride (“SMhBN”) particles dispersed therewithin, wherein the surface modified boron nitride particles are produced by reacting hexagonal boron nitride particles with a substituted phenyl diazonium chloride represented by the structure (I):
- to covalently bond a substituted phenyl radical to a surface of the hexagonal boron nitride particles, the substituted phenyl radical being represented by the structure (II):
- wherein X is a radical selected from NH2—, HO—, R2OC(O)—, R2C(O)O—, HSO3—, NH2CO—, halogens, alkyl and substituted or unsubstituted aryl;
- wherein R1 is hydrogen, alkyl or alkoxy, and R2 is hydrogen, alkyl, or substituted or unsubstituted aryl.
A process comprising casting onto a release surface a dispersion of a plurality of surface modified hexagonal boron nitride particles in a solution of a polymer in a solvent, forming the thus cast dispersion into a viscous liquid film, and, extracting the solvent to form a film having a thickness of less than 500 μm;
- wherein the surface modified hexagonal boron nitride particles are produced by reacting hexagonal boron nitride particles with a substituted phenyl diazonium chloride represented by the structure (I):
- to covalently bond a substituted phenyl radical to a surface of the hexagonal boron nitride particles, the substituted phenyl radical being represented by the structure (II):
- wherein X is a radical selected from NH2—, HO—, R2OC(O)—, R2C(O)O—, HSO3—, NH2CO—, halogens, alkyl and substituted or unsubstituted aryl;
- wherein R1 is alkyl or alkoxy, and R2 is hydrogen, alkyl, or substituted or unsubstituted aryl.
Dependencies are inferred from the claim text.