US5182173A — Coated particles and method for making same

Claim 1

Independent Claim 43 words

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.

Claim 2

Dependent Claim 43 words

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.

Claim 3

Dependent Claim 28 words

The filler material of claim 1, wherein the core comprises a siliceous filler material, a glass filler material, a metal filler material or a metal oxide filler material.

Claim 4

Dependent Claim 13 words

The filler material of claim 2, wherein the core comprises amorphous fused silica.

Claim 5

Dependent Claim 25 words

The filler material of claim 1, wherein the multifunctionally terminated polysiloxane comprises the reaction product of a monofunctionally terminated polysiloxane and a second multifunctional silane.

Claim 6

Dependent Claim 15 words

The filler material of claim 4, wherein the first and second multifunctional silanes are identical.

Claim 7

Dependent Claim 36 words

The filler material of claim 1, wherein the 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 crosslinked silicone elastomer.

Claim 8

Independent Claim 72 words

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.

Claim 9

Independent Claim 72 words

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.

Claim 10

Dependent Claim 11 words

A composite filler material made by the method of claim 7.

Claim 11

Dependent Claim 53 words

The method of claim 7, wherein the monofunctionally terminated polysiloxane comprises: ##STR9## wherein: R 1 is a reactive functional group; R 2 is a alkyl or phenyl; R 3 and R 4 are each independently alkyl, phenyl or fluoroalkyl; and wherein the polysiloxane has a molecular weight between about 500 and about 80,000

Claim 12

Dependent Claim 23 words

The method of claim 9, wherein R 1 is selected from the group consisting of hydride, hydroxyl, alkoxyl, aminoalkyl, haloalkyl, carbinol and carboxyalkyl.

Claim 13

Dependent Claim 17 words

The method of claim 9, wherein R 2 , R 3 and R 4 are each methyl.

Claim 14

Dependent Claim 44 words

The method of claim 7, wherein the silane comprises: ##STR10## wherein: R 5 is a hydrolyzable group; R 6 is a reactive functional group; and R 7 may be an alkyl group, a hydrolyzable functional group, a reactive functional group or a nonreactive group.

Claim 15

Dependent Claim 14 words

The method of claim 12, wherein R 5 is alkoxyl or halo or acyloxyl.

Claim 16

Dependent Claim 24 words

The method of claim 12, wherein R 6 is selected from the group consisting of hydride, alkoxyl, aminoalkyl, haloalkyl, glycidoxyalkyl, mercaptoalkyl, carboxyalkyl and alkenyl.

Claim 17

Dependent Claim 26 words

The method of claim 12, wherein R 7 is selected from the group consisting of alkyl, alkoxyl, haloalkyl, hydride, aminoalkyl, glycidoxyalkyl, mercaptoalkyl, carboxyalkyl, alkenyl and phenyl.

Claim 18

Dependent Claim 47 words

The method of claim 7, wherein the silane crosslinking agent comprises: ##STR11## wherein: R 9 is a hydrolyzable functional group; R 10 is a reactive functional group; and R 11 may be an alkyl group, a hydrolyzable functional group, a reactive functional group or a nonreactive group.

Claim 19

Dependent Claim 13 words

The method of claim 16, wherein R 9 is alkoxyl, halo or acyloxyl.

Claim 20

Dependent Claim 24 words

The method of claim 16, wherein R 10 is selected from the group consisting of hydride, alkoxyl, aminoalkyl, haloalkyl, glycidoxypropyl, mercaptoalkyl, carboxyalkyl and alkenyl.

Claim 21

Dependent Claim 26 words

The method of claim 16, wherein R 11 is selected from the group consisting of hydride, alkyl, alkoxyl, haloalkyl, aminoalkyl, glycidoxyalkyl, mercaptoalkyl, carboxyalkyl, alkenyl and phenyl.

Claim 22

Independent Claim 93 words

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.

Claim 23

Independent Claim 93 words

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.

Claim 24

Dependent Claim 11 words

A composite filler material made by the process of claim 20.

Claim 25

Dependent Claim 30 words

The method of claim 20 wherein an excess of the first multifunctional silane is provided and wherein the coating layer is reacted with the excess to crosslink the coating layer.

Claim 26

Dependent Claim 49 words

The method of claim 20, wherein the first multifunctional silane, comprises: ##STR12## wherein: R 9 is a hydrolyzable group; R 10 is a reactive functional group or a hydrolyzable group; and R 11 may be an alkyl group, a hydrolyzable group, a reactive functional group or a nonreactive group.

Claim 27

Dependent Claim 13 words

The method of claim 23, wherein R 9 is alkoxyl, halo or acyloxyl.

Claim 28

Dependent Claim 24 words

The method of claim 23, wherein R 10 is selected from the group consisting of hydride, alkoxyl, aminoalkyl, haloalkyl, glycidoxypropyl, mercaptoalkyl, carboxyalkyl and alkenyl.

Claim 29

Dependent Claim 26 words

The method of claim 23, wherein R 11 is selected from the group consisting of hydride, alkyl, alkoxyl, haloalkyl, aminoalkyl, glycidoxyalkyl, mercaptoalkyl, carboxyalkyl, alkenyl and phenyl.

Claim 30

Dependent Claim 52 words

The method of claim 20, wherein the monofunctionally terminated polysiloxane comprises; ##STR13## wherein: R 1 is a reactive functional group; R 2 is alkyl or phenyl; R 3 and R 4 are each independently alkyl, cycloalkyl or fluoroalkyl; and wherein, the polysiloxane has a molecular weight between about 500 and about 80,000.

Claim 31

Dependent Claim 23 words

The method of claim 27, wherein R 1 is selected from the group consisting of hydride, hydroxyl, alkoxyl, aminoalkyl, haloalkyl, carbinol and carboxyalkyl.

Claim 32

Dependent Claim 49 words

The method of claim 20, wherein the second multifunctionally terminated silane comprises: ##STR14## wherein: R 5 is a hydrolyzable functional group; R 6 is a reactive functional group; and R 7 may be an alkyl group, a hydrolyzable functional group, a reactive functional group or a nonreactive functional group.

Claim 33

Dependent Claim 13 words

The method of claim 29, wherein R 5 is alkoxyl, halo or acyloxyl.

Claim 34

Dependent Claim 24 words

The method of claim 29, wherein R 6 is selected from the group consisting of hydride, alkoxyl, aminoalkyl, haloalkyl, glycidoxyalkyl, mercaptoalkyl, carboxyalkyl and alkenyl.

Claim 35

Dependent Claim 26 words

The method of claim 29, wherein R 7 is selected from the group consisting of alkyl, alkoxyl, haloalkyl, hydride, aminoalkyl, glycidoxyalkyl, mercaptoalkyl, carboxyalkyl, alkenyl and phenyl.

Claim 36

Dependent Claim 14 words

The method of claim 20, wherein the first and second multifunction silanes are identical.

Claim 37

Dependent Claim 18 words

The composite filler material of claim 1, wherein the inorganic core comprises a material having surface hydroxyl groups.

Claim 38

Dependent Claim 50 words

The composite filler material of claim 34, wherein the elastomer layer is formed by crosslinking a reactive silicone network and the chemical bonding between the elastomer layer and the inorganic core is formed by condensation of silanol groups of the reactive silicone network with surface hydroxyl groups of the core.

Claim 39

Dependent Claim 21 words

The composite filler of claim 35, wherein the elastomer layer is crosslinked by condensation of silanol groups of the reactive network.

Claim 40

Dependent Claim 60 words

The method of claim 7, wherein the reactive silicone network includes a plurality of unreacted silanol groups, the inorganic filler material includes a plurality of hydroxyl groups on the surface thereof and the chemical bonding between the elastomer coating and the filler material is formed by condensation of silanol groups of the network with hydroxyl groups of the filler material.

Claim 41

Dependent Claim 21 words

The method of claim 37, wherein the elastomer coating is crosslinked by condensation of silanol groups of the reactive silicone network.

Claim 42

Dependent Claim 47 words

The method of claim 20, wherein the multifunctionally terminated polysiloxane includes a plurality of terminal silanol functional groups and wherein the coating layer is chemically bonded to the filler particle by condensation of silanol groups of the multifunctionally terminated polysiloxane with the silanol groups on the particle.

Claim 43

Dependent Claim 21 words

The method of claim 20, wherein the coating layer is crosslinked by condensation of silanol groups of the multifunctionally terminated polysiloxane.

Claim 44

Dependent Claim 56 words

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.

Claim 45

Dependent Claim 56 words

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.

Claim 46

Dependent Claim 28 words

The filler material of claim 41 wherein: said core comprises a siliceous filler mateial, a glass filler material, a metal filler mateial or a metal oxide filler material.

Claim 47

Dependent Claim 13 words

The filler material of claim 42, wherein the core comprises amorphous fused silica.

Claim 48

Dependent Claim 45 words

The filler material of claim 41, wherein the crosslinked silicone elastomer comprises the reaction product of a multifunctionally terminated polysiloxane and a first multifunctional silane and wherein the multifunctionally terminated polysiloxane comprises the reaction product of a monofunctionally terminated polysiloxane and a second multifunctional silane.

Claim 49

Dependent Claim 15 words

The filler material of claim 44 wherein the first and second multifunctional silanes are identical.

Claim 50

Dependent Claim 18 words

The composite filler material of claim 41 wherein the inorganic core comprises a material having surface hydroxyl groups.

Claim 51

Dependent Claim 50 words

The composite filler material of claim 46 wherein the elastomer layer is formed by crosslinking a reactive silicone network and the chemical bonding between the elastomer layer and the inorganic core is formed by condensation of silanol groups of the reactive silicone network with surface hydroxyl groups of the core.

Claim 52

Dependent Claim 21 words

The composite filler of claim 47 wherein the elastomer layer is crosslinked by condensation of silanol groups of the reactive network.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1996-01-26	1996-07-27	1997-01-26	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2000-01-26	2000-07-27	2001-01-26	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2004-01-26	2004-07-27	2005-01-26	$7700.00	Window Closed / Lapsed

Coated particles and method for making same

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