Tackifier for pressure-sensitive

Uses Butyl mbber in sealants, coatings, elec, encapsulating compds., and conformal coalings incl. moisture-impermeable coatings, marine and construction sealants, elec, encapsulants, pressure-sensitive adhesives tackifier for pressure-sensitive adhesives processing aid, adhesion promoter... 

Because strong Bronsted (proton) acids and Lewis acids can initiate styrene polymerization, other cationically polymerizable monomers can be added to the styrene-based copolymer list. Due to the facile occurrence of chain transfer processes of polymer chains with impurities, cationically prepared polystyrene-based polymers are low molecular weight materials. Nevertheless, low molecular weight polystyrenes still find important applications as additives, as tackifiers for pressure sensitive adhesives, and in hot melt adhesives. However, the market for low molecular weight polystyrene is small. 

Uses Tackifier for pressure-sensitive adhesives, construction adhesives, pick-up gums for iabeiing adhesion promoter for difficuit-to-bond substrates food-pkg, adhesives, pressure-sensitive adhesives, coatings, paper defoamer in food-contact coatings, paper/paperboard... 

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). 

Materials generally considered to he tackifying resins for pressure sensitive appheations have one characteristic in common, a softening point well above room temperature. The glass transition temperature of the... 

Thus most formulations are compromises which will favor the property that is most critical in the application intended. Figure 2 illustrates typical dependence of tack, peel, and shear performance in a given system as the resin/elastomer ratio is increased. The maxima occur at different tackifier percentages. Silicon elastomers for pressure-sensitive adhesives are invariably used in conjunction with silicon gums as tackifiers. Table 3 displays the uses of various elastomers, and Table 4 contains information on tackifiers and plasticizers. 

Uses Tackifier resin for water-based adhesives and sealants based on acrylic, S/B, nat. rubber, neoprene, and PVAc, esp. for pressure-sensitive adhesives, and for coatings Features Solv.-free... 

Uses Terpene resin for pressure-sensitive and hot-melt adhesives, paint vehicles, textile dry sizes, and waterproofing agents tackifier for nat. 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... 

Chem. Descrip. Glyceryl rosinate CAS 8050-31-5 EINECS/ELINCS 232-482-5 Uses Resin for lacquers, varnishes, adhesives wax modifier tackifier in pressure-sensitive rubber-based adhesives, in solv. and emulsbn types, in EA/A resin wax hot-melt adhesives and coatings modifier (contributes hardness, rapid drying, and resistance to water and alkali) in varnishes improves clarity as a wax modifier Features Pale thermoplastic... 

It is often obvious that the retention of additives, such as tackifiers in Pressure-sensitive adhesives, plasticizers in PVC and antioxidants in many polymers, is essential for making... 

The chemistry and structure of the tackifying terpene resins are developed by E. Ruckel al. These resins, produced commercially from pine turpentine, since the mid-Thirties, are formulated with natural rubber to produce pressure sensitive adhesives. More recently, the scope of their use has been broadened by formulation with elastomers and waxes for hot melt applications. Empirical application tests have developed a broad knowledge of utility but little science or predictability. By use of sophisticated high polymer techniques, polymerization mechanisms are used to explain how the minor structural differences between the beta-pinene and dipentene resins suit these resins respectively for pressure sensitive and hot melt adhesive usage. Again for use application the critical aspects of the formulation are its adhesive and cohesive properties as demonstrated by tack, shear and peel properties. 

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. 

In the earlier art, there was some consideration that partial incompatibility of the tackifier resin with the rubber was responsible for the appearance of tack, but this no longer is seriously held in light of continuing studies by many investigators. Aubrey [38] has addressed this in his review of the mechanism of tackification and the viscoelastic nature of pressure sensitive adhesives. Chu [39] uses the extent of modulus depression with added tackifier as a measure of compatibility. Thus in a plot of modulus vs. tackifier concentration, the resin that produces the deepest minimum is the most compatible. On this basis, Chu rates the following resins in order of compatibility for natural rubber rosin ester > C-5 resin > a-pinene resin > p-pinene resin > aromatic resin. 

Besides the higher volume pressure sensitive adhesives discussed above, the industry also uses other synthetic elastomers as the base component for PSA formulation. Most of these elastomers require some form of tackification to make the materials tacky. However, a few materials are low enough in Tg and sufficiently compliant to be useful without requiring compounding with tackifiers. 

Tackifiers to produce pressure-sensitive adhesives were also prepared as a latex. Self-emulsifying resin or rosin composition, useful as tackifiers for ad-... 

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