US 9,175,147 B2 · Fire-resistant cellulosic material

Abstract

A new approach for improving fire resistance of cellulosic materials is provided, especially when the cellulosic material is to be used in polymer composites. Cellulosic material is treated with an aqueous mixture of alkali metal or ammonium hydroxide and alkaline earth or aluminum metal salt simultaneously with or within a short period of time of preparing the mixture. The treated cellulosic material becomes self-extinguishing and may also have improved thermal stability, improved interfacial thermal resistance, improved resistance to damage by oxidants and other chemical agents, improved resistance to biological agents and/or improved resistance to damage by ultra-violet light.

Claims21

Dependent claims

A process of producing a fire-resistant cellulosic material comprising:

treating a cellulosic material with an aqueous reaction mixture of an alkali metal or ammonium hydroxide and an alkaline earth or aluminum metal salt, wherein the treating is done simultaneously with or in 1 day or less of mixing the alkali metal or ammonium hydroxide and alkaline earth or aluminum metal salt;
and, drying the treated cellulosic material.

Dependencies are inferred from the claim text.

Facts

Application

14/128,332Filed 4 Jul 2012 · us provisional application

Priority

6 Jul 2011

Published

US 2014/0121306 A11 May 2014

Granted

3 Nov 2015

Term ends

Not estimatedThe source records don’t support an estimate.

Classification21 codes

C08K 3/28
Use of inorganic substances as compounding ingredients: nitrogen-containing compounds
C08B 15/10
Preparation of other cellulose derivatives or modified cellulose , e.g. complexes: crosslinking of cellulose
C08K 3/10
Use of inorganic substances as compounding ingredients: metal compounds
C08K 3/16
Use of inorganic substances as compounding ingredients: halogen-containing compounds

Fire-resistant cellulosic material

Life of this patent

Fire-resistant cellulosic material

Life of this patent

Abstract

Claims21