Low viscosity filler composition of boron nitride particles of spherical geometry and process
AssigneeGeneral Electric Company
InventorsDavid Lodyga, Joseph W. Tereshko, Ajit Sane, Thomas Fox
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Abstract
A low viscosity filler boron nitride agglomerate particles having a generally spherical shape bound together by an organic binder and to a process for producing a BN powder composition of spherically shaped boron nitride agglomerated particles having a treated surface layer which controls its viscosity.
Claims8
A boron nitrate filled polymer composition having a viscosity below 300 cp composed of a polymer selected from the group consisting of a polyester, epoxy or polyamide and particles of boron nitride loaded to a concentration in the composition of between 30-50 wt. % BN wherein the particles of BN have a surface layer composed of an organic binder or decomposition product thereof in a molar ratio of binder to boron nitride of between about 0.00170-0.008.
A method for forming a low viscosity boron nitrate filled polymer composition having a viscosity below 300 cp composed of a polymer selected from the group consisting of a polyester, epoxy or polyamide and particles of boron nitride comprising the steps of mixing an aqueous slurry including irregular shaped non-spherical BN particles, water, an organic binder and a base for maintaining the pH of the slurry basic;
- maintaining the concentration of said organic binder above at least about 1.8 wt. % of the slurry, selecting a molar ratio of binder or decomposition product to boron nitride between about 0.00170-0.008, spray drying the aqueous slurry into a low viscosity powder composition of BN agglomerated particles and loading the low viscosity powder composition of BN agglomerated particles into the polymer composition to a concentration of between 30-50 wt. % BN.
Dependencies are inferred from the claim text.