Stretchable wiring film and method for forming the same
AssigneeShin-Etsu Chemical Co., Ltd.
InventorJun Hatakeyama
Life of this patent
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Abstract
A stretchable wiring film includes: (A) a stretchable film made of, at least as a top surface of the stretchable film, a cured product of a stretchable film material containing a silicone polyurethane resin; and (B) a stretchable wiring. The top surface of the stretchable film has a repeated uneven pattern formed with depths of 0.1 μm to 5 mm and pitches of 0.1 μm to 10 mm. The stretchable wiring is formed on the top surface of the stretchable film where the repeated uneven pattern is formed. Thus, the present invention provides: a stretchable wiring film having less decrease in electric conductivity in stretching and excellent water repellency on the film top surface; and a method for forming the stretchable wiring film.
Claims16
A stretchable wiring film comprising:
- (A) a stretchable film comprising, at least as a top surface of the stretchable film, a cured product of a stretchable film material comprising a silicone polyurethane resin, wherein the top surface of the stretchable film has a pattern formed with depths of 0.1 μm to 5 mm and pitches of 0.1 μm to 10 mm;
- and
- (B) a stretchable wiring, wherein
- the stretchable wiring is formed on the top surface of the stretchable film where the pattern is formed,
- wherein the silicone polyurethane resin is a silicone-pendant polyurethane resin having a structure shown by the following general formula (1):
- wherein R1, R2, and R3 may be identical to or different from each other and 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;
- R4's may be identical to or different from each other and 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 —(OSiR1R2)s—OSiR1R2R3 group;
- R5 represents a hydrogen atom or a linear or branched alkyl group having 1 to 4 carbon atoms;
- R6 represents a single bond, a methylene group, or an ethylene group;
- R7 represents a hydrogen atom or a methyl group;
- X represents a linear or branched alkylene group having 3 to 7 carbon atoms and optionally containing an ether group;
- “q”, “r”, and “s” each represent an integer in a range of 0 to 20;
- and a1 and a2 represent proportions of repeating units and satisfy ranges of 0≤a1<1.0, 0≤a2<1.0, and 0<a1+a2≤1.0.
A method for forming a stretchable wiring film, comprising the steps of:
- (1) applying a stretchable film material comprising a silicone-pendant polyurethane resin having a structure shown by the following general formula (1) onto a substrate having a pattern formed with depths of 0.1 μm to 5 mm and pitches of 0.1 μm to 10 mm;
- (2) curing the stretchable film material by heating and/or light irradiation;
- (3) peeling a cured product of the stretchable film material from the substrate to form a stretchable film having a top surface with the pattern;
- and
- (4) applying a stretchable electro-conductive paste onto the top surface of the stretchable film where the pattern is formed to form a stretchable wiring,
- wherein R1, R2, and R3 may be identical to or different from each other and 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;
- R4's may be identical to or different from each other and 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 —(OSiR1R2)s—OSiR1R2R3 group;
- R5 represents a hydrogen atom or a linear or branched alkyl group having 1 to 4 carbon atoms;
- R6 represents a single bond, a methylene group, or an ethylene group;
- R7 represents a hydrogen atom or a methyl group;
- X represents a linear or branched alkylene group having 3 to 7 carbon atoms and optionally containing an ether group;
- “q”, “r”, and “s” each represent an integer in a range of 0 to 20;
- and a1 and a2 represent proportions of repeating units and satisfy ranges of 0≤a1<1.0, 0≤a2<1.0, and 0<a1+a2≤1.0.
Dependencies are inferred from the claim text.