Designed Polymers for



POLYVEST® ST Silane Terminated Liquid Rubber

Liquid polymeric silane coupling agent for
silica-reinforced tire tread compounds

POLYVEST® ST is a new generation of silane-modified liquid  rubber additives. It combines the advantages of liquid rubbers and  functional silanes. Its silane functionalities allow the surface modification of hydrophilic  silica fillers and therefore improve the dispersibility of silica in rubber compounds. Due to its rubber-based nature  POLYVEST® ST exhibits a natural fit and excellent compatibility  to rubber matrix of tire compounds.
During the vulcanization process it incorporates chemically, which  exhibits a reinforcement of the rubber matrix and efficiently  prevents migration and bleeding out. POLYVEST® ST enables to improve the overall performance of 
silica-reinforced tire tread compounds in combination with sulfur  silanes like Si 69® or Si 266®. Its application allows to significantly  reducing the rolling resistance, which has been indicated by reduced PAYNE effect and tan delta at 60 °C in GREEN Tire and truck tire treads compounds. 

POLYVEST® ST is available in three different grades with varying degree of silanization which allows to optimize the silane/rubber ratio depending on the individual performance needs.

Key features and benefits 

• Reduced compound viscosity
• No migration and bleeding out
• Improved micro-dispersion of silica
• Reduced Tan d at 60°C
• Reduced Payne effect

POLYVEST® ST Data Sheets

POLYVEST® 130 S Unmodified Liquid Rubber

Liquid Polybutadiene as partial oil replacement for 
tire tread compounds

POLYVEST® 130 S is liquid rubber designed for the needs of the
tire and rubber industry. It exhibits an excellent compatibility with
different rubbers and allows the complete or partial replacement
of oil while keeping the compound viscosity low.
POLYVEST® 130 S is reactively incorporated during the vulcanization
process, which prevents migration and bleeding out.
POLYVEST® MA 75 and POLYVEST® EP MA 120 are maleic
anhydride functionalized grades, and will improve the adhesion
to metal surfaces.

Key features and benefits 

• Low glass transition temperature (-100°C) and low product viscosity 
• Reduced compound viscosity
• No bleeding out and migration and therefore reduces hardness changes over time 
• Excellent grip and breaking performance on ice and  snow and at same time on wet and dry roads 
• Increased wear resistance

POLYVEST® 130 S Data Sheets