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US 5,182,173 AGranted
Coated particles and method for making same
AssigneeRogers Corporation
InventorGwo Swei
Life of this patent
Estimating the term…
Abstract
A composite filler material is disclosed. The filler material includes an inorganic core and a layer of crosslinked silicone elastomer covering the core and chemically bonded to the core. A process for making the composite filler material is also disclosed.
Claims48
A composite filler material comprising:
- an inorganic core, and
- a layer of crosslinked silicone elastomer covering the core and chemically bonded to the core wherein the crosslinked silicone elastomer comprises the reaction product of a multifunctionally terminated polysiloxane and a first multifunctional silane.
A method for making a composite filler material, comprising:
- reacting a monofunctionally terminated polysiloxane with a multifunctional silane to form a multifunctionally terminated polysiloxane;
- reacting the multifunctionally terminated polysiloxane with a silane cross linking agent to form a reactive silicone network;
- coating an inorganic filler material with the reactive silicone network;
- and
- curing the reactive silicone network to form a crosslinked silicone elastomer coating that is chemically bonded to the filler material.
2 more elements
A method for making a composite filler material, comprising:
- reacting a first multifunctional silane with an inorganic filler particle to form a surface modified inorganic filler particle having free silanol groups thereon;
- reacting a second multifunctional silane with a monofunctionally terminated polysiloxane to form a multifunctionally terminated polysiloxane;
- coating the surface modified particle with the multifunctionally terminated polysiloxane;
- reacting to multifunctionally terminated polysiloxane with the free silanol groups on the surface modified particle to form a coating layer on the particle that is chemically bonded to the particle;
- and
- crosslinking the coating layer.
3 more elements
A composite filler material comprising:
- an inorganic core;
- a layer of crosslinked silicone elastomer covering the core and chemically bonded to the core;
- and
- wherein said composite filler material comprises from about 0.75 volume fraction to about 0.99 volume fraction inorganic core and from about 0.01 volume fraction to about 0.25 volume fraction cross-linked silicone elastomer.
1 more element
Dependencies are inferred from the claim text.