Invented by Kenya Ito, Hiroyuki Iizuka, Shino SATO, Yasuhiro Shiraishi, JNC Corp
The JNC Corp invention works as followsThe laminated film is a three-layer material that includes a top layer of a polycarbonate thermoplastic polyurethane and a substrate layer of urethane acrylicate. In this order, the adhesive layer, which contains a pressure-sensitive adhesive, comes in contact with a layer of urethaneacrylate. Preferably, the top coating layer includes a unit derived from ?-methacryloxypropylhepta(trifluoropropyl)-T8-silsesquioxane.
Background for Laminated film
Field of Invention
The present invention is a laminated material that can be used to make a paint-protection film.
Description of Related Art.
Paint protection film (PPF), a product similar to a film, is used as a surface protector for industrial products used outdoors. The PPF has a basic structure that is a laminate with at least two layers, including a substrate of flexible and transparent resin films and an adhesive layer. On the market, you can find a laminated sheet that has a coating for improving the stain-proofing and scratch-resistance of a substrate. It also includes a release film on the opposite side of the adhesive. The PPF must be cut to fit the surface to be protected. Next, an adhesive layer from the PPF cut to size is placed in close contact with the target surface. The PPF protects a product from external stimuli such as dust, sand and river water. It also protects the product from microorganisms, contact or excretions from animals, plants, insects, etc. The PPF acts as a cushion that absorbs pressure and repels dirt and rainwater. The product is protected from external stimuli.
Initially, a PPF like this was designed for industrial products that were used in harsh environments, such as airplanes. However, it has become popular today as a protective member on the surface of an automobile or motorbike. When a roof or hood of an automobile is covered with a protective film, it can protect the body from bird feces and insect carcasses. It also helps to prevent scratches caused by stones, mischievous actions, and malicious acts. When a PPF-covered surface is cleaned with water, it’s possible to remove dirt from the PPF surface. This allows the PPF to perform for a long time. The PPF can be removed from the body after a period of use and replaced by a new PPF.
Due to the rapid spread of automobiles and motorcycles around the world, PPFs are in demand in a wider range of environments. For example, they can be used for harsher climates, such as in colder areas, tropical regions, or arid zones. With the growth of the PPF industry, it is important that PPFs can be applied easily by workers without any special skills. In recent PPFs there has been a need for various performance aspects such as adaptability to the different surface shapes of motorbikes and automobiles, durability for long-term stimulation, transparency, smoothness, and detachability.
In Patent Document 1, for example, a PPF with excellent adhesion characteristics is described. It is made by laminating an adhesive layer and a substrate film whose surface roughness has been controlled. In this PPF however, the stainproof coating added to the surface of the substrate was not examined in detail, and it was found to be a problem for motorbikes and automobiles, whose exteriors were considered important.
In Patent Document 2, for example, is described a PPF where a first polyurethane layer, a second thermoplastic polyurethane layer, and a final pressure-sensitive adhesive layer are laminated together in this order. This PPF still needs to be improved in many aspects.
Patent Document No. 2016-20079, Japanese Unexamined Patent Application Publication. 2016-20079.
Translation of PCT Application No. 2008-539107. 2008-539107.
Problems that need to be solved
The inventors have studied the configuration of an ideal laminate to improve different aspects of performance for a PPF.
Means for Solving the Problems
The inventors concluded that a laminated sheet with a three-layer construction, in which the top coating layer is a polycarbonate thermoplastic polyurethane and the substrate layer includes a urethane acrylicate cured product are in contact, exhibits many of the performance requirements for a PPF. This includes excellent weather and heat resistance. The inventors also found that a laminated film with a top coating layer containing a fluorine containing compound, and typically an urethane acrylicate cured product containing a structural element derived from a derivative of fluorosilsesquioxane, exhibited excellent performance. The present invention can be described as follows.
(1) A laminated sheet with a three-layer construction in which the top coating layer contains a polycarbonate thermoplastic polyurethane product, the substrate layer is made of polycarbonate, and then an adhesive layer of pressure sensitive adhesive.
(2) The laminated films according to (1) where the urethane-acrylate-cured product contains fluorine atoms.
(3) The laminated films according to (1) or 2), wherein the product urethane-acrylate is cured and includes a structural element derived from the fluorosilsesquioxane derivate represented by Formula (1).
In Formula (1), Rf 1 through Rf 7 independently represent a linear or branched fluoroalkyl groups having 1-20 carbon atoms, or a methylene-containing group in which the methylene atom may be replaced with oxygen, or a Fluoroaryl Group having 6-20 carbon atoms, in which a minimum of one hydrogen is substituted by fluorine, or a Trifluoromethyl Group; or, a Fluoroarylalkyl
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