Terpene Phenolic Resin

TPR145 combines a high softening point of about 140–160 °C with an acid value of 20–30 mgKOH/g, indicating a phenolic‑modified terpene structure that provides both thermal stability and moderate polarity—two key requirements for graft CR adhesives used on PVC artificial leather. The phenolic polarity improves interaction with the chloroprene rubber matrix and enhances specific adhesion to plasticised PVC surfaces, where non‑polar hydrocarbon tackifiers often struggle to wet and anchor effectively. Its high softening point helps the adhesive film resist softening, creep and bond failure under the heat build‑up and bending loads that PVC artificial leather can experience in use, while still acting as an effective tackifier rather than an inert filler. In practice, TPR145 is typically used as the main tackifier in solvent‑based graft CR formulations for artificial leather and other flexible PVC applications, but formulators should still fine‑tune the tack‑to‑cohesion balance against their specific CR grade, plasticiser level and any co‑tackifiers in the system.

This terpene phenolic resin offers a high softening point (about 140–160 °C for TPR145) and a moderate acid value of 20–30 mgKOH/g, giving it phenolic polarity and thermal stability comparable to many industrial phenolic tackifiers used with SSBR, BR and NR. In rubber compounding, that polarity helps the resin interact with the rubber phase and with reinforcing fillers, so it can partially replace petroleum‑derived hydrocarbon tackifiers while improving green tack and filler wetting in solution‑SBR and BR‑based adhesive stocks. For natural‑rubber‑rich systems, the combination of terpene backbone and phenolic modification supports adhesion to a wider range of substrates and helps maintain tack under heat, which is useful in sole adhesives, rubber‑to‑fabric bonding and other solvent‑based rubber adhesives. Because Foreverest offers both a high‑softening, higher‑acid grade and a lower‑softening, low‑acid grade on this page, compounders can choose the more polar, higher‑softening version when heat resistance and cohesive strength are critical, or the lower‑acid, lower‑softening version where easier processing and softer compounds are preferred. Development teams should still run their own cure and performance tests, as the effect on vulcanisation and the final balance of tack, peel and dynamic properties will depend on the specific resin grade, rubber type and overall compound recipe.