# US 8,273,448 B2 · Reinforced silicone resin films

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- Number: US 8,273,448 B2
- Document ID: US8273448B2
- Status: Granted
- Kind: B2
- Application number: 12/527,629
- Filed: 2008-01-31
- Published: 2010-02-04
- Granted: 2012-09-25
- Earliest claimed: 2007-02-22
- Assignees: Dow Corning Corporation
- Inventors: Bizhong Zhu
- Web page: https://patentgrep.com/patent/US8273448B2

## CPC

- B32B 27/28: comprising synthetic resins not wholly covered by any one of the sub-groups {B32B27/30 - B32B27/42}
- B32B 27/04: as impregnant, bonding, or embedding substance {(not used)}
- Y10T 428/24967: Absolute thicknesses specified
- Y10T 428/24975: No layer or component greater than 5 mils thick
- Y10T 428/25: Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
- Y10T 428/31663: As siloxane, silicone or silane
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Reinforced silicone resin films comprising at least two polymer layers, wherein at least one of the polymer layers comprises a cured product of a at least one silicone resin having an average of at least two silicon-bonded hydrogen atoms, hydroxyl groups, or hydrolysable groups per molecule, and at least one of the polymer layers comprises a carbon nanomaterial.

## Claims

### Claim 1

A reinforced silicone resin film consisting essentially of:
a first polymer layer; and
a second polymer layer on the first polymer layer; wherein at least one of the polymer layers comprises a cured product of at least one silicone resin having an average of at least two silicon-bonded hydrogen atoms, hydroxy groups, or hydrolysable groups per molecule, and at least one of the polymer layers comprises a carbon nanomaterial, provided when both of the polymer layers comprise a cured product of a silicone resin, then both of the polymer layers comprise a reinforcement selected from (i) a carbon nanomaterial, (ii) a fiber reinforcement, or (iii) a mixture comprising (i) and (ii).

### Claim 2 (depends on 1)

The reinforced silicone resin film according to claim 1, wherein the first polymer layer and the second polymer layer each have a thickness of from 0.01 to 1000 μm.

### Claim 3 (depends on 1)

The reinforced silicone resin film according to claim 1, wherein at least one of the first polymer layer and the second polymer layer comprises a reinforcement selected from a carbon nanomaterial, a fiber reinforcement, or a mixture thereof.

### Claim 4 (depends on 1)

The reinforced silicone resin film according to claim 1, wherein the silicone resin has the formula (R1R22SiO1/2)w(R22SiO2/2)x(R2SiO3/2)y(SiO4/2)z (I), wherein R1 is C1 to C10 hydrocarbyl or C1 to C10 halogen-substituted hydrocarbyl, R2 is R1, —H, —OH, or a hydrolysable group, w is from 0 to 0.95, x is from 0 to 0.95, y is from 0 to 1, z is from 0 to 0.95, w+x+y+z=1, y+z is from 0.05 to 1, and w+x is from 0 to 0.95, provided the silicone resin has an average of at least two silicon-bonded hydrogen atoms, hydroxy groups, or hydrolysable groups per molecule.

### Claim 5 (depends on 1)

The reinforced silicone resin film according to claim 1, wherein the silicone resin is a rubber-modified silicone resin prepared by reacting an organosilicon compound selected from (i) a silicone resin having the formula (R1R42SiO1/2)w(R42SiO2/2)x(R4SiO3/2)y(SiO4/2)z (II) or (ii) hydrolysable precursors of (i), and a silicone rubber having the formula R53SiO(R1R5SiO)mSiR53 (III) in the presence of water, a condensation catalyst, and an organic solvent to form a soluble reaction product, wherein R1 is C1 to C10 hydrocarbyl or C1 to C10 halogen-substituted hydrocarbyl, R4 is R1, —OH, or a hydrolysable group, R5 is R1 or a hydrolysable group, m is from 2 to 1,000, w is from 0 to 0.95, x is from 0 to 0.95, y is from 0 to 1, z is from 0 to 0.95, w+x+y+z=1, y+z is from 0.05 to 1, and w+x is from 0 to 0.95, provided the silicone resin (II) has an average of at least two silicon-bonded hydroxy or hydrolysable groups per molecule, the silicon rubber (III) has an average of at least two silicon-bonded hydrolysable groups per molecule, and the mole ratio of silicon-bonded hydrolysable groups in the silicone rubber (III) to silicon-bonded hydroxy or hydrolysable groups in silicone resin (II) is from 0.01 to 1.5.

### Claim 6 (depends on 1)

The reinforced silicone resin film according to claim 1, wherein at least one of the polymer layers comprises a carbon nanomaterial selected from carbon nanoparticles, fibrous carbon nanomaterials, or layered carbon nanomaterials.

### Claim 7 (depends on 1)

The reinforced silicone resin film according to claim 1, wherein at least one of the polymer layers comprises a reinforcement selected from a carbon nanomaterial, a fiber reinforcement, or a mixture thereof.

### Claim 8

A reinforced silicone resin film comprising:
a first polymer layer;
a second polymer layer on the first polymer layer; and
at least one additional polymer layer on at least one of the first or second polymer layers; wherein at least one of the polymer layers comprises a cured product of at least one silicone resin having an average of at least two silicon-bonded hydrogen atoms, hydroxy groups, or hydrolysable groups per molecule, and at least one of the polymer layers comprises a carbon nanomaterial.

### Claim 9 (depends on 8)

The reinforced silicone resin film according to claim 8, wherein the first polymer layer, the second polymer layer, and the additional polymer layer each have a thickness of from 0.01 to 1000 μm.

### Claim 10 (depends on 8)

The reinforced silicone resin film according to claim 8, wherein the film comprises three polymer layers.

### Claim 11 (depends on 8)

The reinforced silicone resin film according to claim 8, wherein the silicone resin has the formula (R1R22SiO1/2)w(R22SiO2/2)x(R2SiO3/2)y(SiO4/2)z (I), wherein R1 is C1 to C10 hydrocarbyl or C1 to C10 halogen-substituted hydrocarbyl, R2 is R1, —OH, or a hydrolysable group, w is from 0 to 0.95, x is from 0 to 0.95, y is from 0 to 1, z is from 0 to 0.95, w+x+y+z=1, y+z is from 0.05 to 1, and w+x is from 0 to 0.95, provided the silicone resin has an average of at least two silicon-bonded hydrogen atoms, hydroxy groups, or hydrolysable groups per molecule.

### Claim 12 (depends on 8)

The reinforced silicone resin film according to claim 8, wherein the silicone resin is a rubber-modified silicone resin prepared by reacting an organosilicon compound selected from (i) a silicone resin having the formula (R1R42SiO1/2)w(R42SiO2/2)x(R4SiO3/2)y(SiO4/2)z (II) or (ii) hydrolysable precursors of (i), and a silicone rubber having the formula R53SiO(R1R5SiO)mSiR53 (III) in the presence of water, a condensation catalyst, and an organic solvent to form a soluble reaction product, wherein R1 is C1 to C10 hydrocarbyl or C1 to C10 halogen-substituted hydrocarbyl, R4 is R1, —OH, or a hydrolysable group, R5 is R1 or a hydrolysable group, m is from 2 to 1,000, w is from 0 to 0.95, x is from 0 to 0.95, y is from 0 to 1, z is from 0 to 0.95, w+x+y+z=1, y+z is from 0.05 to 1, and w+x is from 0 to 0.95, provided the silicone resin (II) has an average of at least two silicon-bonded hydroxy or hydrolysable groups per molecule, the silicon rubber (III) has an average of at least two silicon-bonded hydrolysable groups per molecule, and the mole ratio of silicon-bonded hydrolysable groups in the silicone rubber (III) to silicon-bonded hydroxy or hydrolysable groups in silicone resin (II) is from 0.01 to 1.5.

### Claim 13 (depends on 8)

The reinforced silicone resin film according to claim 8, wherein at least one of the polymer layers comprises a carbon nanomaterial selected from carbon nanoparticles, fibrous carbon nanomaterials, or layered carbon nanomaterials.