# US 10,308,782 B2 · Polydimethylsiloxane grafted polyethylene foam

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- Number: US 10,308,782 B2
- Document ID: US10308782B2
- Status: Granted
- Kind: B2
- Application number: 15/324,770
- Filed: 2014-08-15
- Published: 2017-07-20
- Granted: 2019-06-04
- Earliest claimed: 2014-08-15
- Assignees: Dow Global Technologies LLC
- Applicants: Dow Global Technologies LLC
- Inventors: Zhe Du; Cheng Chen; David Hong Fei Guo; Dachao Li; Gangwei Sun; Jianxin Zhang
- Web page: https://patentgrep.com/patent/US10308782B2

## CPC

- C08J 9/122: {Hydrogen, oxygen, CO2, nitrogen or noble gases}
- C08J 9/0061: {characterized by the use of several polymeric components}
- H01B 3/441: {from alkenes}
- H01B 3/46: silicones
- C08J 2201/032: Impregnation of a formed object with a gas
- C08J 2203/06: CO2, N2 or noble gases
- C08J 2207/06: Electrical wire insulation
- C08J 2323/06: Polyethene
- C08J 2351/06: grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
- C08J 2387/00: Characterised by the use of unspecified macromolecular compounds, obtained otherwise than by polymerisation reactions only involving unsaturated carbon-to-carbon bonds
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})

## Abstract

In one aspect there is provided a foam comprising: a polymeric matrix comprising polyethylene grafted polymerized siloxane, and a plurality of cells formed in the polymeric matrix and containing a blowing agent comprising carbon dioxide. In another aspect there is provided a method of making a foam comprising: grafting polymerized siloxane to polyethylene to form a grafted intermediate; molding the grafted intermediate to form a molded intermediate; and foaming the molded intermediate using high-pressure CO2 to form the foam, wherein the foam has a porosity greater than 75%.

## Claims

### Claim 1

A foam comprising:
a polymeric matrix comprising polyethylene grafted polymerized siloxane, and
a plurality of cells formed in the polymeric matrix and containing a blowing agent comprising carbon dioxide,
wherein the polymerized siloxane is selected from the group consisting of:
(A) a vinyl-terminated diethylsiloxane-dimethylsiloxane copolymer having the Formula (III)
where:
m=77-185;
n=17-52; and
the mole percent of diethylsiloxane is 18 to 22 percent, and
(B) a symmetric Methacryloxypropyl Terminated PolyDimethylsiloxane having the Formula (VII)
where:
n=8-130;
R3=
and
R4=
R2=CH3; or C2H5.

### Claim 2 (depends on 1)

The foam of claim 1, wherein the polyethylene is low density polyethylene.

### Claim 3 (depends on 1)

The foam of claim 1, wherein the polyethylene is high density polyethylene.

### Claim 4 (depends on 1)

The foam of claim 1 wherein the foam has a porosity greater than 75 percent.

### Claim 5 (depends on 1)

The foam of claim 1, wherein the mole percent of polymerized siloxane is from 0.5 to 10 percent of the polymeric matrix.

### Claim 6 (depends on 1)

The foam of claim 1, wherein the polymeric matrix comprises a blend of polyethylene and polyethylene grafted polymerized siloxane.