Pressure sensitive adhesive rosin

Rosin ester resins are used extensively in pressure-sensitive adhesives as tackifiers. The adhesive is formulated by blending the resin with a polymer in solution or as aqueous emulsions. Typical compositions may contain about 50% resin. The glycerol or pentaerythritol esters of stabilized rosins are often used because they are stable on aging. 

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. 

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

Use Hot-melt and pressure-sensitive adhesives, mastics and sealants, varnishes, ester gum, soldering compounds, core oils, insulating compounds, soaps, paper sizing, printing inks, polyesters (formed by reaction of the conjugated acids of rosin with acrylic acid, followed by reaction with a glycol). 

Chem. Descrip. Pale rosin ester, pentaerythritol base CAS 8050-26-8 EINECS/ELINCS 232-479-9 Uses For EVA and other hot-melt prods., pressure-sensitive adhesives, rubber-compds., sealings, coatings, etc. 

Chem. Descrip. Pentaerythritol ester of tall oil rosin CAS 8050-26-8 EINECS/ELINCS 232-479-9 Uses Tackifier for NR, SBR, IR, SBS, hot-melt adhesives, mastic adhesives, contact cements, and pressure-sensitive adhesives in emulsion form used in SBR, natural rubber, and neoprene latex adhesives food pkg, adhesives, coatings, paper, closures with sealing gaskets for food containers defoamer in food-contact paper/paperboard Features High-melting... 

P.H. Wetzel,"Rosins and Rosin Derivatives in Pressure-Sensitive Adhesives", Rubber Age, (November 1957). 

Hayashi S., Kim H.J., Kajiyama M., Ono H., Mizumachi H., Zufu Z., Miscibility and pressure-sensitive adhesive performances of acrylic copolymer and hydrogenated rosin systems, J. Appl Polym. Sci., 71(4), 1999,651-663. 

Pressure-sensitive adhesives must be very sticky, that is, exhibit high tack. The tack of an adhesive usually reaches a maximum in the range of 40 to 70°C above Tg. Frequently the polymer by itself is not sufficiently tacky for commercial purposes. To solve the problem, people dissolve tackifiers in the adhesive. A tackifier is a compound that increases the Tg of the material while lowering the modulus. By contrast, plasticizers decrease Tg, as well as lower the modulus. Tackifiers are often based on natural product derived rosins, obtained from ground-up pine tree stumps and related materials (95). These rosins are multicycUc steroid-like ring structures. 

Rosins have long been used in pressure-sensitive adhesives, the most familiar of which are the solvent-based rubber cements. The compounding of these... 

The raw materials used for pressure-sensitive adhesives are natural and synthetic rubbers in conjunction with modified rosins, phenol - formaldehyde resins, or hydrocarbon resins. In addition to rubber, polyacrylates, polymethacrylates, poly(vinyl ethers), and polyisobutenes also are used frequently, again mostly in combination with resins. Silicone resins are used for special applications. 

The first pressure sensitive adhesives were based on natural rubber and rosin. They were applied as patches and tapes for surgical use [203], In the 19th century some early technical tapes were derived therefrom (e.g., Citoplast, P. Beiersdorf Co., Germany), but the application range was very narrow. When spray painting was introduced in the automotive industry, such tapes were employed to mask color lines. They were imperfect and had to be improved [204]. This was the starting point for the development of industrial tapes. 

Pressure-sensitive adhesives (PSAs) are typically used to hold objects together by bringing the surfaces into contact under pressure, applied briefly at room temperature. Natural rubber, styrenebutadiene (SBR), butadiene-acrylonitrile rubber, thermoplastic adhesives, polyacrylates, and silicones are the typical materials used for pressure-sensitive adhesive applications. These materials have viscous properties to provide flow while resisting excessive flow, partial elastic behavior to be able to carry some load, the ability to store energy to provide peel and tack, and the capability to dissipate energy during usage. Tack may be obtained by the use of resinous softeners such as pine tar or rosin esters, by the use of mineral fillers and various coal tar or petroleum derivatives. 

Natural rubber + ester rosin pressure sensitive adhesive 36 (c) 45,101... 

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). 

Standard-grade PSAs are usually made from styrene-butadiene rubber (SBR), natural rubber, or blends thereof in solution. In addition to rubbers, polyacrylates, polymethylacrylates, polyfvinyl ethers), polychloroprene, and polyisobutenes are often components of the system ([198], pp. 25-39). These are often modified with phenolic resins, or resins based on rosin esters, coumarones, or hydrocarbons. Phenolic resins improve temperature resistance, solvent resistance, and cohesive strength of PSA ([196], pp. 276-278). Antioxidants and tackifiers are also essential components. Sometimes the tackifier will be a lower molecular weight component of the high polymer system. The phenolic resins may be standard resoles, alkyl phenolics, or terpene-phenolic systems ([198], pp. 25-39 and 80-81). Pressure-sensitive dispersions are normally comprised of special acrylic ester copolymers with resin modifiers. The high polymer base used determines adhesive and cohesive properties of the PSA. 

The adhesives industry is the third most important market for rosin. Rosin, modified rosins, and rosin derivatives are used in several types of adhesives, including the pressure-sensitive, hot-melt, and elastomer-based latices, and solvent rubber cements. 

Chem. Descrip. Highly hydrogenated wood rosin CAS 659974)6-0 EINECS/ELINCS 266041-3 Uses Tackifier, modifying resin in adhesives and hot-melt-applied decorative, pressure-sensitive, and heat-sealable coalings softener, tackifier for NR, SBR, NBR, HR, CR, chlorinated rubbers, PS, block copolymers, polyisobutylene, EVA improves tack, processing a pigment disp. in rubber... 

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... 

CAS 65997-06-0 EINECS/ELINCS 266-041-3 Synonyms Rosin, hydrogenated Classification Thermoplastic acidic resin Definition Derived from hydrogenation of wood rosin Pre rerties Solid soften, pt. (R B) 68 C acid no. = 160 Uses Tackifier, modifier in adhesives and hot-melt-applied decorative, pressure-sensitive, and heat-sealable coatings prod, of rosin ester gum coatings on fresh citrus fruit component of food-contact articles fragrance in cosmetics... 

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