Polydimethylsiloxane grafted polyethylene foam

Patent metadata

Field	Value
Publication number	US-10308782-B2
Application number	US-201415324770-A
Country	US
Kind code	B2
Filing date	Aug 15, 2014
Priority date	Aug 15, 2014
Publication date	Jun 4, 2019
Grant date	Jun 4, 2019

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%.

First claim

What is claimed is:

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;
R 3 =

 and
R 4 =

 R 2 =CH 3 ; or C 2 H 5 .

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

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

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

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

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

Assignees

• Dow Global Technologies Llc

Inventors

• Du Zhe
• Chen Cheng
• Guo David Hong Fei
• Li Dachao
• Sun Gangwei
• Zhang Jianxin

Classifications

• H01B3/46

  silicones · CPC title

• C08J9/122 Primary

  Hydrogen, oxygen, CO2, nitrogen or noble gases · CPC title

• H01B3/441

  from alkenes · CPC title

• C08J2201/032

  Impregnation of a formed object with a gas · CPC title

• C08J2323/06

  Polyethene · CPC title