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Protective film for automotive wheel

A technology for protecting films and wheels, applied to wheels, pressure-sensitive films/sheets, film/sheet-like adhesives, etc., to prevent rust, scratches, and glue residue

Inactive Publication Date: 2012-04-11
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the antirust films for automobile brake discs disclosed in Patent Documents 2 to 8 cannot actually meet the above requirements.

Method used

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  • Protective film for automotive wheel
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  • Protective film for automotive wheel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] (Preparation of (meth)acrylic polymer)

[0114] In a four-neck flask with a stirring blade, a thermometer, a nitrogen inlet tube, and a condenser, add 30 parts by weight of 2-ethylhexyl acrylate, 70 parts by weight of ethyl acrylate, 5 parts by weight of methyl methacrylate, 4 parts by weight of Parts of 2-hydroxyethyl acrylate, 0.2 parts by weight of 2,2'-azobisisobutyronitrile and 200 parts by weight of ethyl acetate as a polymerization initiator, introduce nitrogen while slowly stirring, and keep the liquid temperature in the flask Polymerization was carried out at about 65° C. for about 6 hours to prepare a (meth)acrylic polymer solution (35% by weight). The glass transition temperature (Tg) of the (meth)acrylic polymer was -29°C.

[0115] (Preparation of binder solution)

[0116] The (meth)acrylic polymer solution (35% by weight) was diluted to 20% by weight with ethyl acetate, and 0.6 wt. Parts of isocyanate compound (coronet L, manufactured by Nippon Polyureth...

Embodiment 2

[0120] Except for using the (meth)acrylic adhesive solution (B) obtained by blending 0.8 parts by weight of the isocyanate compound (Coronet L, manufactured by Nippon Polyurethane Industry Co., Ltd.), the same operation as in Example 1 was performed to produce an automobile Protective film for wheels.

Embodiment 3

[0122] Except for using the (meth)acrylic adhesive solution (C) obtained by blending 1.0 parts by weight of the isocyanate compound (Coronet L, manufactured by Nippon Polyurethane Industry Co., Ltd.), the same operation as in Example 1 was performed to produce an automobile Protective film for wheels.

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Abstract

A protective film for automotive wheels which has excellent performances including the following. The protective film has excellent weatherability, and even when the motor vehicle is stored for a long period from completion to delivery, the protective film can be sufficiently prevented from decreasing in adhesive force. The protective film for automotive wheels comprises a base layer and a pressure-sensitive adhesive layer, and is characterized in that the pressure-sensitive adhesive layer has been formed from a pressure-sensitive adhesive composition comprising at least a (meth)acrylic polymer and a crosslinking agent, the (meth)acrylic polymer comprising 40-90 wt.% (meth)acrylic monomer having an alkyl group with 1-14 carbon atoms and, as other constituent monomer ingredient, at least a hydroxylated monomer, and the crosslinking agent being contained in an amount of 0.1-6 parts by weight per 100 parts by weight of the acrylic polymer, and that the pressure-sensitive adhesive layer has a gel content of 60-95 wt.%.

Description

technical field [0001] The present invention relates to a protective film for automobile wheels. Background technique [0002] Conventionally, when automobile wheels such as aluminum wheels are transported by ships, for example, due to humidity changes in the ship, water seeps into the inner sides of the automobile wheels from the outside, resulting in disk discs on the inner side of the wheels. In order to prevent problems such as rust on the brakes, a protective film is attached to the wheel surface. [0003] The protective film used for car wheels needs to be kept in a state of sticking until the car is delivered, and there are requirements such as: when the protective film is peeled off after delivery, it can be easily peeled off, and no adhesive residue is left on the wheel surface when peeled off. [0004] In Patent Document 1, it is disclosed that a protective film is installed on the outer side of the disc surface of the automobile wheel, and a pressure relief part ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B7/12B32B27/30B60B7/02C09J7/02C09J133/06C09J7/22C09J7/38
CPCC09J175/04B60J11/10C09J7/0246B32B27/30C09J133/066C09J2433/00C09J2201/606C09J7/0264C09J133/06C08G2170/40C08F2220/1808C08G18/6229C09J2423/046B32B7/12C09J7/38C09J7/22Y10T428/266Y10T428/265Y10T428/2891C08F220/1808C08F220/1802C08F220/14C08F220/20
Inventor 花木一康齐藤友纪山中刚
Owner NITTO DENKO CORP
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