Nonburning, nondripping, char-forming, polypropylene composition

Details Nonburning, nondripping, char-forming, polypropylene composition Nonburning, nondripping, char-forming, polypropylene composition

1973-07-24

1976-02-03

Hoke, V. P.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 4246, 260 459NP, 260 4595S, C08F 600

Patent

active

039364160

ABSTRACT:
A nonburning, nondripping, char-forming composition of polypropylene by incorporating at least one of the following systems:
1. ammonium polyphosphate (preferably coated with stearylamine) and dipentaerythritol
2. melamine pyrophosphate and dipentaerythritol
3. reaction product of phosphoric acid, urea, dipentaerythritol, and melamine
4. reaction product of phosphoric acid, phosphorus pentoxide, at least one of pentaerythritol, dipentaerythritol, and tripentaerythritol; and melamine.
Preferably all additive systems are degassed at elevated temperature to permit polypropylene compositions containing said additives to be molded without formation of voids.
The thermal degassing of the phosphorus-containing flame retardant additive system prior to their incorporation with polypropylene considerably diminishes void formation or foaming during molding operation.

REFERENCES:
patent: 3337495 (1967-08-01), Corbett et al.
patent: 3395746 (1968-08-01), Szabo et al.
patent: 3446765 (1969-05-01), Pryer
patent: 3546161 (1970-12-01), Wolheim
patent: 3562197 (1971-02-01), Sears et al.
patent: 3639299 (1972-02-01), MacDowell
patent: 3649591 (1972-03-01), Murray et al.
patent: 3810862 (1974-05-01), Mathis
American Chemical Society -- Div. Organic Coatings & Plastic Chemistry, Preprints, Vol. 28, No. 1, 1968, pp. 237 to 242.
Chemistry & Uses of Fire Retardants -- by Lyons, John Wiley & Sons, Inc., N.Y.C., 1970, pp. 256 to 258 & 290.

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