Microencapsulated red phosphorus

Details Microencapsulated red phosphorus Microencapsulated red phosphorus

2005-01-25

2005-01-25

Wyrozebski, Katarzyna (Department: 1714)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

C523S205000, C524S414000, C524S492000

Reexamination Certificate

active

06846854

ABSTRACT:
A method for preparing encapsulated red phosphorus is disclosed. The method entails obtaining a material system that contains dispersed particulate red phosphorus having a mean particle size of 0.1 to 100 μm in an aqueous phase that comprise urea, formaldehyde and a water-soluble silicon dioxide precursor, adding to the material system a sufficient amount of acid to lower the pH to 0 to 5 and maintaining the resulting acidic system at a temperature of 80 to 120° C. for a period longer than one hour. The encapsulated red phosphorus of the invention is suitable for using as a flame retarding agent for plastics molding compositions.

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patent: 196 19 701 (1996-11-01), None
patent: 0 763 566 (1997-03-01), None
patent: 8700187 (1987-01-01), None

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