Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Adhesive outermost layer
Patent
1998-09-03
1999-10-12
Zirker, Daniel
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Adhesive outermost layer
428354, 428355EN, 428355BL, 428355AC, 428516, 428517, B32B 712, B32B 2732
Patent
active
059652551
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a pressure-sensitive adhesive sheet for surface protection which protects metal surfaces, glass surfaces, coated surfaces, etc., and more particularly to a pressure-sensitive adhesive sheet for surface protection, which has good adhesion to an object to be adhered, which can be easily removed (peeled off) from an object to be adhered after exposure to carbon arc, which has also good adhesion between the respective layers and which neither stains the surface to which the adhesive sheet is adhered nor leaves any adhesion mark thereon.
BACKGROUND ART
As a conventional method for protecting a top coating on the body surface of a vehicle for which coating has been completed, there may be mentioned a method in which a paraffin wax is thinly coated thereon. However, this method involves such problems that it does not exhibit sufficient protecting function; it takes much time and labor to remove the paraffin wax; and the waste water produced at the time of its removal leads to environmental pollution.
Further, there are methods for applying directly a pressure-sensitive adhesive sheet for surface protection to metal surfaces, glass surfaces or coated surfaces, etc., as disclosed in Japanese Provisional Patent Publication No. 188579/1989 and Japanese Patent Publication No. 74627/1993, etc. This pressure-sensitive adhesive sheet is prepared by applying an adhesive solution to a plastic film followed by drying, or by co-extruding a substrate and an adhesive. However, the former involves a problem that it leads to an increase in costs, since the step of forming a film, the step of treating with an anchor coating agent, the step of applying an adhesive thereto, etc., are separate one another in many cases and yields are bad. On the other hand, the latter involves a problem that it does not have so good adhesion between the substrate and the adhesive agent and the adhesive remains on the surface of the an object to be adhered when the sheet is removed.
The purpose of the present invention is to provide a pressure-sensitive adhesive sheet for surface protection, which has good adhesion to an object to be adhered, which does not leave any stains and adhesion marks on an object to be adhered when the sheet is removed and which can easily be removed from an object to be adhered.
DISCLOSURE OF THE INVENTION
The present invention relates to a pressure-sensitive adhesive sheet for surface protection, wherein the following three layers (A), (B) and (C) have been laminated: 100-50% by weight of a hydrogenated random copolymer consisting of 1-50% by weight of styrene and 99-50% by weight of a diene hydrocarbon and 0-50% by weight of a low-molecular-weight elastomer, and 40-0% by weight of a polyolefin; copolymer, consisting of 1-50% by weight of styrene and 99-50% by weight of a diene hydrocarbon, and 97-5% by weight of a polyolefin; and
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention will be explained below in detail.
The layer (A) of the present invention is in contact with the layer (B), and is an adhesive layer which shows adhesion to an object to be adhered when it is in contact therewith.
The hydrogenated random copolymer employed in the layer (A) consisting of 1-50% by weight of styrene and 99-50% by weight of a diene hydrocarbon may preferably be a polymer of which the melt flow rate (determined in accordance with ASTM D1238 or JIS K7210, hereinafter abbreviated as "MFR") is 1-20 g/10 min. at 230.degree. C. under a load of 2.16 kg. If the styrene content is less than 1% by weight, the resulting resin comes to have poor thermoplasticity, whereas if it is more than 50% by weight, the resulting copolymer comes to exhibit poor adhesion to an object to be adhered and poor heat resistance. The styrene content may preferably be 5-40% by weight. The hydrogenation degree may preferably be 90% or more, more preferably 95% or more. If the hydrogenation degree is less than 90%, the resulting copolymer may exhibit poor resistance to weather and reduced compatibi
REFERENCES:
JP 55-139477 A Patent Abstract, Oct. 31, 1980.
JP 9-25466 A Patent Abstract, Jan. 28, 1997.
Hino Kinnosuke
Ichimura Syuji
Tsuzuki Yoshinaga
Conlin David G.
Nichiban Company Limited
Zirker Daniel
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