Rubber composition with diphenylguanidine as shielding agent to reduce cure impact of recycled carbon black
DPG acts as a shielding agent in recycled carbon black-containing tire rubber compounds, stabilizing cure profiles and enhancing performance, allowing for higher rCB usage and maintaining comparable properties to virgin carbon black.
WO2026147925A1PCT designated stage Publication Date: 2026-07-09BRIDGESTONE CORP +2
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- BRIDGESTONE CORP
- Filing Date
- 2025-12-30
- Publication Date
- 2026-07-09
AI Technical Summary
Technical Problem
Recycled carbon black (rCB) reduces various performance metrics when used in tire rubber compounds, primarily due to reduced dispersion and interactions with impurities, affecting cure profiles and crosslink density.
Method used
Incorporating diphenylguanidine (DPG) as a shielding agent in rubber compositions with recycled carbon black to stabilize the cure profile and enhance the effectiveness of carbon black accelerators, allowing for higher rCB usage while maintaining suitable tire component properties.
Benefits of technology
DPG offsets the negative impacts of rCB impurities, enabling improved tire component performance with increased rCB content, achieving comparable or better properties to those with virgin carbon black.
✦ Generated by Eureka AI based on patent content.
Smart Images
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Abstract
The interaction of rCB and DPG behavior disclosed herein allows for formula adjustments which minimize negative property impacts that are historically experienced when utilizing rCB. The more rCB that is used in the compound additional DPG can be added to shield the inorganic (ash) content from disrupting the cure of the compound. Carbon black filled compounds with high rCB content and DPG are included herein.
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