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Infinite performance. Infinite potential. 
With High Performance Tackifier Resin.

At Bakelite Synthetics, both our Bakelite® and Resonance™ family of resins includes a series of curing, reinforcing and tackifier resins for the manufacture of tires and rubber goods. Bakelite’s portfolio is positioned to meet the growing needs of the tire and rubber industry, today and tomorrow.

Phenolic tackifier resins

Based on alkylphenol novolaks as they have a good compatibility to rubber due to the long alkyl chain. Bakelite Synthetics has developed the high performance phenolic tackifier resin Bakelite® PF 6204 K that leads to a high initial rubber tack but also to a high long term tack. No loss of adhesive strength occurs when the mix is stored over a lengthy period. There are no side effects on vulcanization. The resin acts as a mild plasticizer, thus promoting distribution of the filler.

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Rubber articles

Such as automotive, truck, and motorcycle tires, conveyer belts and the like consist of multiple layers of materials with identical or different compositions. During manufacture of such articles, the unvulcanized rubber mixtures must adhere to one another for a lengthy period prior to compression moulding and vulcanization. The property called contact or assembly tack is required. Mixtures of synthetic rubber do not generally exhibit adequate assembly tack. Addition of tackifying resins, generally at a level of 2-6 phr, significantly improves the tack of unvulcanized mixtures of styrene-butadiene copolymers, polybutadiene-, polychloroprene-, nitril- and APT rubber.

The resins must exhibit good compatibility with the elastomers and other components of the mix. The melting range of the resins must match to the processing temperature of the rubber mix. The resin must flawlessly distributed throughout the mix both when it is incorporated on a roller and when this operation is carried out in an internal mixer.

Phenolic tackifier resins are based on alkylphenol novolaks as they have a good compatibility to rubber due to the long alkyl chain. Bakelite Synthetics has developed the high performance phenolic tackifier resin Bakelite® PF 6204 K that leads to a high initial rubber tack but also to a high long term tack. No loss of adhesive strength occurs when the mix is stored over a lengthy period. There are no side effects on vulcanization. The resin acts as a mild plasticizer, thus promoting distribution of the filler. The resin is also suitable for use as an additive in spreading solutions to increase their adhesive strength.

Tested and verified by an independent, ISO 17025 certified institute

Bakelite® PF 6204 K Phenolic Resin K Phenolic Resin S
Chemistry Alkylphenol Novolac Alkylphenol Novolac Alkylphenol Novolac
Physical Form Flakes Flakes Flakes
Softening Point (Ring & Ball) °C 140 140 90
Specific Gravity at 20 °C g/cm3 1.05 1.03 1.01
Odor almost odorless almost odorless almost odorless
Storage Stability Years 2  2 2
Physical Properties
  • Chemistry: Alkylphenol Novolac
  • Form: Flakes
  • Melting Range: 130 +8 °C
  • Softening point (Ring and Ball): 140 +8 °C
  • Color Number Gardner: max. 10
  • Specific Gravity at 20 °C: 1.05 g/cm3
Key Performance Benefits
  • Excellent initial and long-term tack properties
  • Can address industry requirementsfor adhesion
  • Little to no impact on vulcanization, which will add process reliability
Addressing Market Needs
  • The need for high-performing raw materials to achieve desired product end-use properties
  • Drop-in versatility to improve processing stability in current and future applications
  • Materials compatible with both synthetic and natural rubber compound systems
Recommended Applications
  • Tire Construction
  • Re-treading
  • Manufactured Rubber Goods (belts, hoses)
  • Adhesives
  • Coating
  • Oil Field
  • Surfactants

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