Stretchable 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 film is 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. The top surface of the stretchable film has a repeated uneven pattern formed with depths of 0.1 μm to 2 mm and pitches of 0.1 μm to 5 mm. Thus, the present invention provides a stretchable film having excellent stretchability, with the film top surface being excellent in water repellency and free from sticking; and a method for forming the stretchable film.
Claims15
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 repeated uneven pattern formed with depths of 0.1 μm to 2 mm and pitches of 0.1 μm to 5 mm, and
- 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 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 repeated uneven pattern formed with depths of 0.1 μm to 2 mm and pitches of 0.1 μm to 5 mm;
- (2) curing the stretchable film material by heating and/or light irradiation;
- and
- (3) peeling a cured product of the stretchable film material from the substrate,
- 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.