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Double-sided pressure-sensitive adhesive tape or sheet and process of producing the sameRelated Patent Categories: Stock Material Or Miscellaneous Articles, Web Or Sheet Containing Structurally Defined Element Or Component, Adhesive Outermost Layer, Three Or More LayersDouble-sided pressure-sensitive adhesive tape or sheet and process of producing the same description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060194043, Double-sided pressure-sensitive adhesive tape or sheet and process of producing the same. Brief Patent Description - Full Patent Description - Patent Application Claims
FIELD OF THE INVENTION [0001] The present invention relates to a double-sided pressure-sensitive adhesive tape or sheet and to a process of producing the same. In particular, the invention relates to a double-sided pressure-sensitive adhesive tape or sheet which is suitably used in a junction of a case or part at the time of manufacture (fabrication) of various OA instruments and electronic parts and to a process of producing the same. BACKGROUND OF THE INVENTION [0002] In recent years, in OA instruments and electronic parts (in particular, mobile instruments) such as personal computers, printers, cellular telephones, PDA, digital cameras, and digital video cameras, their productions increase with their diffusion, and size reduction and thinning are being designed in parallel to realization of high function. For example, in cellular telephones which are a representative instrument of mobile instruments, for the sake of enlarging the display screen and improving portableness, the major parts to be constructed tend to become thin. In general, a display portion is mainly composed of an LCD module and a backlight unit, and a variety of parts in the sheet form are frequently used (laminated) for the purpose of revealing functions such as light emission, reflection, light shielding, and light guiding. In the fabrication (junction) of these parts, double-sided pressure-sensitive adhesive tapes or sheets, screws, adhesives, and the like are usually used (see JP-A-2002-249741) (The term "JP-A" as used herein means an "unexamined published Japanese patent application"). [0003] In the fabrication (junction) of parts, for example, in the case where a double-sided pressure-sensitive adhesive tape or sheet is used, because of restrictions in the thickness of products or parts, double-sided pressure-sensitive adhesive tapes or sheets having a relatively thin thickness tend to be used among commercially available double-sided pressure-sensitive adhesive tapes or sheets. However, in many cases, double-sided pressure-sensitive adhesive tapes or sheets merely composed of a pressure-sensitive adhesive layer only (so-called "substrate-less double-sided pressure-sensitive adhesive tapes or sheets") are used as conventional double-sided pressure-sensitive adhesive tapes or sheets having a thin thickness. As the thickness is decreased, the strength of a double-sided pressure-sensitive adhesive tape or sheet is lowered so that the double-sided pressure-sensitive adhesive tape or sheet is cut during the adhesion works, or it is actually difficult to again release a double-sided pressure-sensitive adhesive tape or sheet which has been stuck once, resulting in a lowering of the workability. [0004] On the other hand, in sites where a further ultra-thin layer structure is required, conventional double-sided pressure-sensitive adhesive tapes or sheets become difficult for use because of restrictions in the clearance. For this reason, the object is achieved by coating a liquid adhesive in place of the double-sided pressure-sensitive adhesive tape or sheet. [0005] However, since an adhesive is liquid with respect to its properties, it is difficult to make the coating thickness uniform. Also, since its fluidity is high, an inconvenience following the adhesion into other portions than the necessary site is liable to occur. Further, in general, it takes a time to complete curing, an aspect of which becomes a factor of lowering the productivity of fabrication works, and therefore, such is inferior in economy. SUMMARY OF THE INVENTION [0006] Accordingly, an object of the invention is to provide a double-sided pressure-sensitive adhesive tape or sheet having an excellent strength even though its thickness is thin and a process of producing the same. [0007] Another object of the invention is to provide a double-sided pressure-sensitive adhesive tape or sheet not only having a necessary thin thickness but also holding a good strength without causing cutting at the time of or during its use and a process of producing the same. [0008] A further object of the invention is to provide a double-sided pressure-sensitive adhesive tape or sheet which can be stably produced in the longitudinal and roll-wound form nevertheless its thickness is very thin and which can be easily rewound with excellent workability and a process of producing the same. [0009] Even another object of the invention is to provide a double-sided pressure-sensitive adhesive tape or sheet which can be utilized even though a space between junction parts is in a thin region that has not been employed so far in a junction measure utilizing a double-sided pressure-sensitive adhesive tape or sheet and a process of producing the same. [0010] For the sake of achieving the foregoing objects, the present inventors made extensive and intensive investigations. As a result, it has been found that by employing a support (substrate) having a thickness in a very thin thickness region that has not been used as a support (substrate) of a double-sided pressure-sensitive adhesive tape or sheet so far, defining the total thickness including the support and the pressure-sensitive adhesive layer to be less than 0.030 mm and defining the breaking strength to be a specified value, it is possible to obtain a double-sided pressure-sensitive adhesive tape or sheet having an excellent strength even though its thickness is thin, leading to accomplishment of the invention. [0011] Specifically, the invention provides a double-sided pressure-sensitive adhesive tape or sheet comprising a support having a pressure-sensitive adhesive layer on the both surfaces thereof, wherein the double-sided pressure-sensitive adhesive tape or sheet has a total thickness including the thickness of the support and the two pressure-sensitive adhesive layers formed on the both surfaces of the support of 0.003 mm or more and less than 0.03 mm and a breaking strength of from 2 to 26 MPa/10 mm-width. [0012] The foregoing support preferably has a thickness of from 0.002 to 0.012 mm. The support is preferably a plastic film, and especially preferably a polyethylene terephthalate film. [0013] The double-sided pressure-sensitive adhesive tape or sheet of the invention may have a length of 5 m or more and have a roll-wound form. [0014] Also, the invention provides a process of producing a double-sided pressure-sensitive adhesive tape or sheet including the following steps (A) to (C), wherein in the step (B), in laminating the pressure-sensitive adhesive layer formed on the release liner on one surface of the support, a tension to be applied to the support is less than 2 N. [0015] Step (A): A step of coating a pressure-sensitive adhesive on a release treatment surface of a release liner to form a pressure-sensitive adhesive layer on the release liner. [0016] Step (B): A step of laminating the pressure-sensitive adhesive layer formed on the release liner on one surface of a support to form a first pressure-sensitive adhesive layer on the support. [0017] Step (C): A step of coating a pressure-sensitive adhesive on the other surface of the support to form a second pressure-sensitive adhesive layer on the support. [0018] It is preferable that the support to be used in the foregoing step (B) is a roll-wound longitudinal support and that in feeding the roll-wound longitudinal support to laminate the pressure-sensitive adhesive layer formed on the release liner on one surface of the support, a tension to be applied to the support is less than 2 N. [0019] It is suitable that the process of producing a double-sided pressure-sensitive adhesive tape or sheet according to the invention further includes the following step (D). [0020] Step (D): A step of roll winding in such a manner that the second pressure-sensitive adhesive layer is superimposed on the release treatment surface of the other surface of the release liner, to obtain a roll-wound double-sided pressure-sensitive adhesive tape or sheet. [0021] The foregoing support preferably has a thickness of from 0.002 to 0.012 mm. Also, the double-sided pressure-sensitive adhesive tape or sheet may have a total thickness including the thickness of the support and the two pressure-sensitive adhesive layers formed on the both surfaces of the support of 0.003 mm or more and less than 0.03 mm. Further, the double-sided pressure-sensitive adhesive tape or sheet preferably has a breaking strength of from 2 to 26 MPa/10 mm-width. Continue reading about Double-sided pressure-sensitive adhesive tape or sheet and process of producing the same... Full patent description for Double-sided pressure-sensitive adhesive tape or sheet and process of producing the same Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Double-sided pressure-sensitive adhesive tape or sheet and process of producing the same patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Double-sided pressure-sensitive adhesive tape or sheet and process of producing the same or other areas of interest. ### Previous Patent Application: Device for releasing an agent to be detected through olfaction Next Patent Application: Printable adhesive tape which is not noisy when unwound manufactured using an opaque film based on biorientated polypropylene Industry Class: Stock material or miscellaneous articles ### FreshPatents.com Support Thank you for viewing the Double-sided pressure-sensitive adhesive tape or sheet and process of producing the same patent info. IP-related news and info Results in 0.93019 seconds Other interesting Feshpatents.com categories: Qualcomm , Schering-Plough , Schlumberger , Seagate , Siemens , Texas Instruments , 174 |
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