Heat-expandable microspheres containing siloxane-based substances that maintain high expandability during prolonged heating by preventing the volatile expanding agent from permeating through the softened thermoplastic resin shell.

Patentradars sammanfattning

The invention provides heat-expandable microspheres comprising a thermoplastic resin shell and a siloxane-based substance (A) with ≥2% weight volatilization at 150°C for 24 hours. Unlike conventional hydrocarbon-based expanders that cause deflation during extended heating, the siloxane component's Si-O bond structure prevents permeation through the softened resin, preserving expandability even after repeated heating cycles. The microspheres find application in foamed inks, wallpapers, lightweight composites, and cushioning materials requiring sustained heat resistance.

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