M&t Chemicals, Inc.

Stanley Littman

Roger T Guthrie

Edwin L Sukman

Justin L Hirshman

Philip H Ravenscroft

Irving Touval

Carl R Gloskey

Novel phosphorus compounds of the general formula ##STR1## contain up to 22% or more of phosphorus and impart an effective level of flame retardancy to a variety of natural and synthetic materials.

Novel phosphorus compounds and flame retardant compositions containing

Additives can be permanently incorporated into melt spun fibers by cold drawing the fibers under conditions that generate a network of interconnecting microvoids within the fiber. The microvoids are formed in the presence of specified liquid or vapor media which fill the microvoid network. The temperature of the medium is below the effective glass transition temperature of the fibers containing said medium. The additive is either present in said medium or is applied to drawn fibers containing said medium.

Additive-containing fibers

An improved method is provided to reproducibly obtain stannic oxide of a type suitable for polishing plastic lenses. The optical density, bulk density and color of the oxide are within specified limits.

Preparation of stannic oxide

Additives can be permanently incorporated into melt spun fibers by cold drawing the fibers under conditions that generate a network of interconnecting microvoids within the fiber. The microvoids are formed concurrently with the drawing of the fiber in a non-solvent liquid or vapor media, which media fills the microvoid network. The temperature of the medium is below the effective glass transition temperature of the fibers containing said medium. The additive is either present in said medium or is applied to drawn fibers containing said medium.

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Sharon, NJ, United States of America

Stanley Littman