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Protection sheet for coating film

a protective sheet and coating layer technology, applied in the direction of film/foil adhesives, coatings, transportation and packaging, etc., can solve the problems of insufficient curing reaction of the coating layer in a certain case, discoloration and damage, and inability to raise the curing temperature in order to avoid adverse affections, etc., to achieve excellent stripping

Inactive Publication Date: 2009-03-12
LINTEC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a protective sheet for a coating layer that is less likely to change in quality or discolor, and is excellent in a stripping property after adhered for a long period of time. This protective sheet is particularly useful for coating layers in which a small amount of solvent remains or is insufficiently cured. The protective sheet comprises a substrate sheet and a pressure-sensitive adhesive layer, which contains an addition reaction type silicone-based pressure-sensitive adhesive and a curing catalyst. The protective sheet can be applied on cars and is particularly useful for coating layers in which a small amount of solvent remains or is insufficiently cured.

Problems solved by technology

When transporting cars, brought about are the inconveniences that the coating layers of car bodies and parts become lusterless, discolored and damaged due to suspended matters such as dirts and dusts, rain, grass pollen and the like, colliding matters such as sands and the like and contact by workers.
However, in heating and curing coating layers applied on car bodies and parts, the curing reaction of the coating layers does not sufficiently proceed in a certain case even after passing through a drying furnace.
However, in heating and curing coating layers applied on synthetic resin-made bumpers, the curing temperature can not be elevated in order to avoid adverse affections such as deterioration and deformation of the resin.
Accordingly, the coating layers on the coated resin-made bumpers are insufficiently dried even after passing through a drying furnace, and therefore a small amount of the solvent remains or the curing reaction does not sufficiently proceed in a certain case.
When adhering a protective sheet on a coating layer in such state, brought about are problems such as “stepping (the phenomenon that deformations brought about by fine wrinkles and lifting produced on the sheet in adhering the protective sheet are transferred onto the coating layer, whereby the coating layer is deformed)”, “whitening (the phenomenon that deviation is caused in the composition of the coating layer due to affinity thereof with a pressure-sensitive adhesive layer of the sheet and that the coating layer looks white when stripping the sheet)” and “adhesive deposit (the phenomenon that the pressure-sensitive adhesive layer is partially transferred onto the coating layer when stripping the sheet)”.
However, the performances of the protective sheets for a coating layer which have the pressure-sensitive adhesive layers described above are not still satisfactory.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0054]A polyethylene terephthalate film “PET25T70 manufactured by Toray Industries, Inc.” having a thickness of 25 μm was used as a substrate sheet for the protective sheet, and a polyethylene terephthalate film “SP-PET38YSD manufactured by Lintec Corporation” having a thickness of 38 μm which was coated with a fluororesin was used as a release sheet.

[0055]Used as the addition reaction type silicone-based adhesive was a solution prepared by diluting with 100 parts by mass of toluene, a solution containing 100 parts by mass of SD4585PSA (addition reaction type silicone containing a cross-linking agent) manufactured by Dow Corning Toray Co., Ltd. and 0.9 part by mass of SRX-212 manufactured by Dow Corning Toray Co., Ltd. which was a platinum-based curing catalyst.

[0056]The solution described above was applied on the surface of the substrate sheet described above by a knife coating method so that a thickness after drying was 30 μm and dried at 130° C. for 5 minutes, and then the substr...

example 2

[0057]The same substrate sheet and release sheet as used in Example 1 were used to carry out the following procedure.

[0058]Used as the addition reaction type silicone-based adhesive was a solution prepared by diluting with 100 parts by mass of toluene, a solution containing 100 parts by mass of SD4585PSA (an addition reaction type silicone containing a cross-linking agent) manufactured by Dow Corning Toray Co., Ltd., 10 parts by mass of SD4587LPSA (an addition reaction type silicone containing a cross-linking agent) manufactured by Dow Corning Toray Co., Ltd. and 1 part by mass of SRX-212 manufactured by Dow Corning Toray Co., Ltd. which was a platinum-based curing catalyst.

[0059]The solution described above was applied on the surface of the substrate sheet described above by a knife coating method so that a thickness after drying was 30 μm and dried at 130° C. for 5 minutes, and then a layer side which was a pressure-sensitive adhesive layer was irradiated with an electron beam at ...

example 3

[0060]A protective sheet for a coating layer was prepared in the same manner as in Example 1, except that a polyethylene terephthalate film “PET25T Q37 manufactured by Toray Industries, Inc.” having a thickness of 25 μm which contains a UV absorbent was used as a substrate sheet.

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Abstract

Provided is a protective sheet for a coating layer comprising a substrate sheet and provided thereon a pressure-sensitive adhesive layer, which can be applied as well to a coated surface insufficiently cured immediately after dried, and the pressure-sensitive adhesive layer described above comprises an addition reaction type silicone-based pressure-sensitive adhesive.

Description

TECHNICAL FIELD[0001]The present invention relates to a protective sheet for a coating layer, more specifically to a protective sheet for a coating layer which does not allow coating layers applied on automotive bodies and parts of automobiles to change in quality or discolor and which is excellent in a stripping property after adhered for a long period of time.[0002]The protective sheet for a coating layer according to the present invention is a protective sheet capable of being applied as well to a coating layer of a urethane-based coating material in which a small amount of a solvent remains due to insufficient drying and which is insufficiently cured after drying, and it is particularly useful as a protective sheet for coated plastic-made parts such as bumpers and the like.BACKGROUND ART[0003]When transporting cars, brought about are the inconveniences that the coating layers of car bodies and parts become lusterless, discolored and damaged due to suspended matters such as dirts...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B32B7/10C09J7/22C09J7/38
CPCC08K5/56C09D183/04C09J7/0207C09J7/0246C09J2203/306Y10T428/28C09J2483/00C09J2467/006Y10T428/2817C08L83/00C09J7/38C09J7/22C09J183/04
Inventor TANAKA, ATSUHIRO
Owner LINTEC CORP