William E Sprenkle

US Patent:

40692884, Jan 17, 1978

Filed:

Apr 26, 1976

Appl. No.:

5/679943

Inventors:

Raymond A. Barkhuff - Hampden MA
William E. Sprenkle - Wilbraham MA

Assignee:

Monsanto Company - St. Louis MO

International Classification:

C08K 559

US Classification:

264141

Abstract:

Disclosed herein is a method for preparing fire retardant styrenic polymer molding compositions with improved impact strength which compositions contain a metal oxide and a halogenated fire retardant additive. The method comprises dispersing the metal oxide into a minor portion of the styrene polymer component using high intensity mixing and temperatures at or above the fusion temperature of the styrene polymer in order to obtain a uniform dispersion. The metal oxide-polystyrene dispersion is then blended with the other ingredients of the polyblend. The resulting blend is compounded at temperatures greater than 255. degree. C. and then comminuted to form a molding composition.

US Patent:

50378694, Aug 6, 1991

Filed:

Jun 8, 1990

Appl. No.:

7/534873

Inventors:

William E. Sprenkle - Palmer MA

Assignee:

Monsanto Company - St. Louis MO

International Classification:

C08K 53492
C08K 511
C08K 505

US Classification:

524100

Abstract:

An improved process is disclosed for preparing flame retardant polyamide molding resins containing melamine cyanurate as a flame retarding agent which results in products with improved mechanical properties and good flame retarding properties. It comprises the addition of a glycol and a phthalate ester to the process wherein a polyamide, melamine or derivatives thereof and cyanuric acid are melt-blended in the presence of water.