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Property Improvements of Bitumen for Roofing with Low Molecular Weight Polyphenylene-ether (PPE) Resin Disclosure Number: IPCOM000005722D
Publication Date: 2001-Oct-30

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The Prior Art Database


PPO SA120 resin is a new low molecular weight (Mn »2500) polyphenylene-ether (PPE) resin recently commercialized by GE Plastics as a polymer additive. In addition to having the well-known properties inherent to PPE, this new resin has an excellent thermal performance--glass transition temperature (Tg) of 165°C combined with a characteristic feature of improved processability. The low molecular weight of the new PPE resin allows PPE to be more easily processed in bitumen and bitumen systems. PPE and polystyrene (PS) are inherently miscible evidenced with a linear Tg increase as a function of PPE loading. The same principle applies to the polystyrene phase of Styrenic Block Copolymers (SBC). Due to the molecular weight constraint of the polystyrene end-blocks in most SBCs, conventional high molecular weight PPO resin could not fully express its beneficial properties. However, for the new PPO SA120 resin, its optimal end-block compatibility makes it an ideal candidate for improving the property profile of bitumen and modified bitumen. Reported herein is an evaluation of PPO SA120 in modified bitumen. With slightly increased temperatures, PPE powder can be blended into the styrenic block of an SBC in bitumen. The addition of a small amount of PPE (2%) into an SBC-bitumen system will improve the softening point, flow temperature, and needle penetration. There is a negligible effect on cold bend temperature and viscosity is increased. Key Words: polyphenylene oxide, PPO, polyphenylene ether, PPE, polyoxyphenylene bitumen, modified bitumen, SBC, SEBS, styrenic block copolymers, Styrene butadiene copolymer, roofing, roof