Stretchable film and method for forming stretchable film

Patent metadata

Field	Value
Publication number	US-11261285-B2
Application number	US-201916568388-A
Country	US
Kind code	B2
Filing date	Sep 12, 2019
Priority date	Sep 27, 2018
Publication date	Mar 1, 2022
Grant date	Mar 1, 2022

Abstract

A stretchable film includes, in a stacked form: a polyurethane film containing a repeating unit having a fluorine atom; and a polyurethane film containing a repeating unit having a silicon atom. At least one surface of the stretchable film is made of the polyurethane film containing a repeating unit having a fluorine atom. Thus, provided are: a stretchable film having excellent stretchability and strength, with the film surface having excellent water repellency; and a method for forming the stretchable film.

First claim

The invention claimed is:

1. A stretchable film comprising, in a stacked form:
a polyurethane film containing a repeating unit having a fluorine atom; and
a polyurethane film containing a repeating unit having a silicon atom, wherein:
at least one surface of the stretchable film is made of the polyurethane film containing a repeating unit having a fluorine atom,
the polyurethane film containing a repeating unit having a fluorine atom is a cured product of a composition containing a resin having a structure shown by the following general formula (3), and
the polyurethane film containing a repeating unit having a silicon atom is a cured product of a composition containing a resin having a structure shown by the following general formula (4):

wherein Rf 1 represents a linear or branched alkylene group having 1 to 200 carbon atoms and at least one or more fluorine atoms, and optionally having an ether group; R's may be identical to or different from each other and each represent a single bond or a methylene group; R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 each represent a linear, branched, or cyclic alkyl group having 1 to 6 carbon atoms, a phenyl group, a 3,3,3-trifluoropropyl group, or a —(OSiR 7 R 8 ) n —OSiR 9 R 10 R 11 group; R 7 , R 8 , R 9 , R 10 , and R 11 each represent a linear, branched, or cyclic alkyl group having 1 to 6 carbon atoms, a phenyl group, or a 3,3,3-trifluoropropyl group; “n” ranges from 0 to 100; R 12 represents a single bond, a methylene group, or an ethylene group; R 13 represents a hydrogen atom or a linear alkyl group having 1 to 4 carbon atoms; R 14 represents a hydrogen atom or a methyl group; X represents a linear or branched alkylene group having 3 to 8 carbon atoms and optionally containing an ether group; “a”, b1, and b2 are each the number of unit in one molecule and represent integers in ranges of 1≤a≤20, 0≤b1≤20, 0≤b2≤20, and 1≤b1+b2≤20; R 15 represents a hydrogen atom or a methyl group; and “c” is the number of unit in one molecule and represents an integer in a range of 1≤c≤4.

2. The stretchable film according to claim 1 , wherein the repeating unit having a silicon atom has a silicon atom in a side chain.

3. The stretchable film according to claim 1 , wherein the stretchable film has a stretching property in a range of 20 to 1000% in a tensile test stipulated according to JIS K 6251.

4. The stretchable film according to claim 2 , wherein the stretchable film has a stretching property in a range of 20 to 1000% in a tensile test stipulated according to JIS K 6251.

5. The stretchable film according to claim 1 , wherein the stretchable film is used as a film in contact with a stretchable conductive wiring.

6. The stretchable film according to claim 2 , wherein the stretchable film is used as a film in contact with a stretchable conductive wiring.

7. A method for forming a stretchable film, comprising:
curing a composition containing a resin having a structure shown by the following general formula (4) by heating and/or light irradiation to form a polyurethane film containing a repeating unit having a silicon atom; and
curing a composition containing a resin having a structure shown by the following general formula (3) by heating and/or light irradiation to stack a polyurethane film containing a repeating unit having a fluorine atom on a surface of the polyurethane film containing a repeating unit having a silicon atom:

wherein Rf 1 represents a linear or branched alkylene group having 1 to 200 carbon atoms and at least one or more fluorine atoms, and optionally having an ether group; R's may be identical to or different from each other and each represent a single bond or a methylene group; R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 each represent a linear, branched, or cyclic alkyl group having 1 to 6 carbon atoms, a phenyl group, a 3,3,3-trifluoropropyl group, or a —(OSiR 7 R 8 ) n —OSiR 9 R 10 R 11 group; R 7 , R 8 , R 9 , R 10 , and R 11 each represent a linear, branched, or cyclic alkyl group having 1 to 6 carbon atoms, a phenyl group, or a 3,3,3-trifluoropropyl group; “n” ranges from 0 to 100; R 12 represents a single bond, a methylene group, or an ethylene group; R 13 represents a hydrogen atom or a linear alkyl group having 1 to 4 carbon atoms; R 14 represents a hydrogen atom or a methyl group; X represents a linear or branched alkylene group having 3 to 8 carbon atoms and optionally containing an ether group; “a”, b1, and b2 are each the number of unit in one molecule and represent integers in ranges of 1≤a≤20, 0≤b1≤20, 0≤b2≤20, and 1≤b1+b2≤20; R 15 represents a hydrogen atom or a methyl group; and “c” is the number of unit in one molecule and represents an integer in a range of 1≤c≤4.

Assignees

• Shinetsu Chemical Co

Inventors

• Hatakeyama Jun
• Iwabuchi Motoaki
• Hasegawa Koji
• Nonaka Shiori
• Ikeda Joe

Classifications

• C08G18/3812

  having fluorine atoms · CPC title

• C08G18/755

  and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate · CPC title

• C08G18/5015

  having fluorine atoms · CPC title

• C08G18/4247

  derived from polyols containing at least one ether group and polycarboxylic acids · CPC title

• C09D127/12

  containing fluorine atoms · CPC title