Class a fire-retardant polyisocyanurate foam boards and process for making

US12202973B1 · kind B1 · utility

Assignee

• DDP Specialty Electronic Materials US, LLC. · US

Inventors

• Kali Ananth Suryadevara · Saginaw, US
• Steve Black · Portland, US
• Dan Youmans · Midland, US
• Kyoung Moo Koh · Midland, US
• Mark Rickard · Midland, US

Key dates

• Filing date: Apr 27, 2023
• Grant date: Jan 21, 2025
• Expiry date: Apr 27, 2043

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2203/14
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A faced polyisocyanurate foam board comprising a halogen-free foam made from a halogen-free foam formulation comprising isocyanate, polyol, and phosphorus-containing flame retardant, and 1.06 to 1.66 kg/m3 (30 to 47 g/ft3) of glass fiber distributed in the foam throughout the thickness of the board; wherein the polyisocyanurate foam board has a trimer content of 11 to 19.5 weight percent, at least 0.1 weight percent phosphorous, and as measured by ASTM E84, a Flame Spread Index of 0 to 25 and a maximum Smoke Development Index of 450 or less.