Pressure sensitive adhesive tapes

Cellulosics. CeUulosic adhesives are obtained by modification of cellulose [9004-34-6] (qv) which comes from cotton linters and wood pulp. Cellulose can be nitrated to provide cellulose nitrate [9004-70-0] which is soluble in organic solvents. When cellulose nitrate is dissolved in amyl acetate [628-63-7] for example, a general purpose solvent-based adhesive which is both waterproof and flexible is formed. Cellulose esterification leads to materials such as cellulose acetate [9004-35-7], which has been used as a pressure-sensitive adhesive tape backing. Cellulose can also be ethoxylated, providing hydroxyethylceUulose which is useful as a thickening agent for poly(vinyl acetate) emulsion adhesives. Etherification leads to materials such as methylceUulose [9004-67-5] which are soluble in water and can be modified with glyceral [56-81-5] to produce adhesives used as wallpaper paste (see Cellulose esters Cellulose ethers). 

A number of higher poly(vinyl ether)s, in particular the ethyl and butyl polymers, have found use as adhesives. When antioxidants are incorporated, pressure-sensitive adhesive tapes from poly(vinyl ethyl ether) are said to have twice the shelf life of similar tapes from natural rubber. Copolymers of vinyl isobutyl ether with methyl acrylate and ethyl acrylate (Acronal series) and with vinyl chloride have been commercially marketed. The first two products have been used as adhesives and impregnating agents for textile, paper and leather whilst the latter (Vinoflex MP 400) has found use in surface coatings. 

Glossary of Terms. Test Methods for Pressure Sensitive Adhesive Tapes, Pressure Sensitive Tape Council, 1996. 

A method of evaluating the adhesive bond to a plastic coating substrate is a tape test. Pressure-sensitive adhesive tape is applied to an area of the adhesive coating, which is... 

The convenient removal of liquid or particulate applied dressing is desirable after a wound has healed sufficiently, a new application is required or other reason the clinician may have. A convenient hand-held device was developed for this purpose consisting of reverse-side pressure-sensitive adhesive tape applied on supply and take-up... 

In practice the methods of test used most frequently are those that measure adhesion. Wechsberg and Webber17 noted that some pressure-sensitive adhesive tapes adhered more strongly to treated rather than untreated film when tape was pressed in the same manner on samples of film and peeled off under controlled conditions with a tensometer, the force required to separate the tape... 

A simpler test that is used widely also involves adhesive tape. In this, a sample of the treated film is coated with a controlled thickness of a standard proofing ink and the coating allowed to dry completely. A specified pressure-sensitive adhesive tape then is applied under controlled conditions and stripped away the percentage of the ink removed by the tape is assessed by eye. The test has the merit of being easy to perform and when experience has been acquired of assessing the extent of removal of ink it can be remarkably accurate. 

Blood specimens should be packaged separately from any material thought to have been abused in order to avoid contamination. Pressure-sensitive adhesive tapes which contain solvents such as toluene should not be used to seal the sample containers. 

Covers polyurethane foam pressure-sensitive adhesive tape used for weather stripping, dust sealing, damping, thermal insulation, sound absorption, and packaging. The specification was validated 6 July 1988. 

Pressure sensitive adhesive tape, probably the most used today. At least 50 mm down leg of tape is needed to form a positive bond with the surface of the liner and there needs to be a substantial overlap of tape over the join of the outer flaps. For this reason 50 mm or 2 inch tape is the most popular. Clear tape pressure sensitive adhesives are susceptible to... 

BS 3924, Specification for Pressure Sensitive Adhesive Tapes for Electrical Insulating Purposes, London (1978). 

ABSTRACT Dif sion of acetone at the interface of a bonded pressure sensitive adhesive tape was measured using single frequency capachance measurements (SFCM) and a novel interdigitated electrode sensor design. The relative concentration of acetone at the bondline as a function of distance from the edge of the specimen and exposure time was correlated to adhesion loss measured by the 90° peel test. 

Our research builds on this limited body of work concerning diffusion at the interface of adhesive joints. We have measured the interfacial diffusion process of acetone into a bonded pressure sensitive adhesive tape bj employing single frequency capacitance measurements and a novel interdigitated electrode sensor design. 

The PSA tape is manufactured by Compac Industries, Inc. (manufacturer part number 807). The backing is 51 microns thick aluminum foil with a 31 microns thick acrylic pressiare sensitive adhesive. The surface of each sensor was washed with isopropyl alcohol and then blown dry with nitrogen prior to applying the pressure sensitive adhesive tape. Tests were conducted at room temperature using acetone as the liquid. 

Cover windows and exterior doors with plastic sheets (6 mil minimum) and seal with pressure sensitive adhesive tape. (This provides a second barrier should the window break or leak). 

Pressure Sensitive Adhesive Tapes A Guide to Their Function, Design, Manufacture and Use, by J. Johnston, 2001, 192 pp.. Pressure Sensitive Tape Council. Well written book by industry expert and a necessary reference book for anyone involved with PSA tapes. 

PRESSURE SENSITIVE TAPE COUNCIL 2514 Stonebridge Lane Northbrook, IL 60065-0609, (847) 562-2530. Fimdamentals of Pressure Sensitive Adhesive Tapes. Tape University Workshops 101 and 102. 

Uses Release agent in food-contact pressure-sensitive adhesive tapes Regulatory FDA 21CFR 178.3860 Polyvinyl alcohol... 

Infrared spectroscopy is an established procedure for the forensic analysis of pressure-sensitive adhesive tapes [13, 19-21]. ATR spectroscopy is a often... 

Figure 6.18 below illustrates the ATR spectrum obtained for a pressure-sensitive adhesive tape. Use this spectrum to identify the material used to manufacture the tape component. Is this a spectrum of the adhesive side or the backing side of the tape ... 

Edwards, H.W., M.F Kostrzewa and G.P. Looby, Pollution Prevention Assessment for a Manufacture of Pressure Sensitive Adhesive Tape, Environmental Res. Brief, National Risk Management, Res. Lab, Cincinnati, OH, US EPA, Washington DC, 1995. 

---