Tackifier resins pressure-sensitive tape

Terpene Resins are low molecular weight hydrocarbon resins prepared by cationic polymerization of certain terpenes. They are used as tackifiers in pressure-sensitive tapes, masking tapes, hot melt coatings and adhesives, laminating adhesives and rubber solution adhesives. Terpene resins can be considered as solid solvents for a rubber which function by solubilizing the smaller tack-bestowing molecules from their dispersion in the mass of a rubber. 

Uses Tackifier in pressure-sensitive and hot-melt adhesives, tapes, paint vehicles, rubber compds. modifier for EVA resins and waxes waterproofing resin for textile sizing in sealants, printing inks FDA cleared for use in closures with sealing gaskets for food containers, etc. Features Thermoplastic Regulatory FDA compliance... 

The most recent development in pressure-sensitive tape manufacture is the development of the hot-melt coating process. Almost aU of the current hot-melt applied adhesives (see also Hot-melt adhesives) are based on SIS thermoplastic rubber, mixed with hydrocarbon tackifier resins and oils in substantial amounts, and an antioxidant in minor amounts. 

Polyterpene resins are transparent, light yellow, odorless, nontoxic, brittle, solid thermoplastic polymers (softening point 80-125 °C) with a relatively low Mw in the range of 1.200-1.300. They are used as tackifiers in hot-melt adhesives for packaging, wood, furniture, and assembly adhesives, in bookbinding, hygiene, nonwoven fabrics, pressure sensitive tapes and labels, industrial and automotive adhesives, and aerospace... 

Tackifying Resins. These are advantageous when the dried surface of the adhesive is intended to be permanently tacky, as with a pressure-sensitive tape, or at least to remain tacky for a long while after removal of solvent. Various naturally occuring resins and their derivatives are used, such as rosin and rosin esters, terpene, and coumarone and coumarone-in-dene. Resins synthesized from petroleum are widely used, often in combination with those from biological sources. 

Environmental concerns, which have resulted in restrictions on the use of organic solvents, have been the impetus for a strong interest in the use of rubber latexes in the formulation of pressure sensitive tapes and labels, can sealants, and contact adhesives. The availability of suitable rubber latexes and tackifying resin dispersions have made this change pos-... 

Thermoplastic block copolymers were used for pressure-sensitive and hot-melt rubber adhesives as from the middle sixties. These adhesives found application in packaging, disposable diapers, labels and tapes, among other industrial markets. The formulation of these adhesives generally includes an elastomer (generally containing styrene endblocks and either isoprene, butadiene or ethylene-butylene midblocks) and a tackifier (mainly a rosin derivative or hydrocarbon resin). 

Applications and Formulation. Pressure-sensitive adhesives are most widely used in the form of adhesive tapes. The general formula for a pressure-sensitive adhesive includes ail elastomeric polymer, a tackifying resin, any necessary fillers, various antioxidants and stabilizers, if needed, and cross-linking agents. 

The most prominent use of MQ resins is as the tackifying agent for silicone pressure-sensitive adhesives (PSA) (523-525). The other main component of silicone PSA is a silicone gum. This mixture of MQ resin and silicone gum is applied to a tape backing such as polytetrafluoroethylene (FIFE) or poly(ethylene... 

So far we have discussed the dynamic mechanical properties of elastomers and tackifying resins separately. We have also examined the dynamic mechanical properties of the commercial tape and label adhesives and defined their requirements for good pressure-sensitive adhesives. We will explain how to obtain PSA with the specific requirements in T, G (co), and G"(w) values from the nontacky elastomer and glassy tackifying resin. First, the simple two-component formulations will be examined for various elastomeric systems. 

Pressure Sensitive Adhesives.Solution pressure sensitive adhesives (PSA s) for tapes and labels are primarily blends of rubber and tackifying materials such as resins. The low... 

Two important parameters in the formulation of pressure sensitive adhesives are tack and hold, which is the ability to resist creep under deadload. As noted, butyl and polyisobutylene are inherently tacky polymers. This tack can be enhanced with a wide variety of resins and other tackifiers. The hold or cohesive strength is low compared to some other pressure sensitive adhesive polymers, such as natural rubber, but can be increased if required by (1) incorporation of high molecular weight PIB or natural rubber, (2) the choice of the other ingredients, particularly resins and fillers, and (3) the partial or preferential curing techniques noted previously. The poly isobutylene polymers are primarily used in label pressure sensitive adhesives and in certain tapes where high cohesive strength is not necessary. 

These polydiene-, polyacrylate- or silicone-based adhesives are generally formulated products (with waxes in order to lower the glass transition temperature, and tackifying resins to provide tack), used as self-adhesives, coated to materials such as paper, films, and polymer tapes, etc. The term Pressure-Sensitive Adhesive relates to the fact that pressure from a linger on the rear of the material to be affixed is all that is required in order to allow the adhesive mass to wet the substrate sufficiently and to adhere to it more or less strongly. Depending on the visco-elastic properties and the adhesion forces developed at the interface, various behaviors can be reached from nonpermanent in the case of Post-it to semipermanent in the case of dressings. 

Uses Processing aid, dispersant for polyolefins and rubbers including hot-melt and pressure-sensitive adhesives, tapes and labels, nonwovens Features Low m.w. exc. thermal and UV stability low color and odor broad corn-pat. with numerous elastomers, polymers, and other tackifying resins Properties Gardner 1 molten solid Brookfield vise. 6000 cP Storage Handled entirely in closed systems blanketed with an inert gas, such as nitrogen and stored in a steel tank at 350-390 F Eastoflex PI 023 [Eastman]... 

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