Back to results
US 4,526,906 AGranted
Non-burning, non-dripping instant set microcellular polyurethanes
AssigneeWegner Development Company
InventorGunter H. Wegner
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeWegner Development Company
InventorGunter H. Wegner
Estimating the term…
Non-burning, non-dripping instant set microcellular polyurethanes involving an isocyanate-terminated reaction product of polyisocyanate with low molecular weight polyether polyol or polyol blends in the presence of other ingredients such as inert liquids with boiling points above about 150.degree. Celsius and accelerating agents for urethane formation. Specifically, this invention provides an improved mode for flame retarding polyurethane compositions by incorporating a mixture of dibromoneopentyl glycol (DBNG) or its esters and a non-reactive flame retardant plasticizer when dissolved or dispersed into the urethane polymer. Molecular sieves are included, which enhance char formation. The compositions have applications with stringent fire retardancy standards, such as electrical insulators, industrial housings, annular spacers, decorative objects, furniture or furniture components, gear and machine components, agricultural components and other related areas.
A non-burning, non-dripping instant set microcellular polyurethane comprising a polyisocyanate or polyisocyanate prepolymer reacted with a low molecular weight polyether polyol that has been blended with a non-reactive liquid modifier, and a flame retardant blend of an organophosphorus plasticizer and a polybrominated polyol in a sufficient quantity to provide desired flame retardancy in said polyurethane.
A non-burning, non-dripping instant set microcellular polyurethane comprising a polyisocyanate or polyisocyanate prepolymer reacted with a low molecular weight polyether polyol that has been blended with a non-reactive liquid modifier, and a flame retardant blend of an organophosphorus plasticizer and a polybrominated polyol in a sufficient quantity to provide desired flame retardancy in said polyurethane and characterized further by a minor amount of an adsorbent molecular sieve made from natural or synthetic crystalline alkali-metal alumino-silicates of the zeolite type, which is added in a sufficient quantity to impart effective char formation in said polyurethane.
A non-burning, non-dripping instant set microcellular polyurethane comprising a polyisocyanate or polyisocyanate prepolymer reacted with a low molecular weight polyether polyol that has been blended with a non-reactive liquid modifier, a flame retardant organophosphorus plasticizer, and a minor amount of an adsorbent molecular sieve made from natural or synthetic crystalline alkali-metal alumino-silicates of the zeolite type.
Dependencies are inferred from the claim text.