Abstract: A polymer composition is provided comprising an ultraviolet light sensitive phosphite and an amount of a polyamine effective to enhance the resistance of the color formation upon exposure to ultraviolet light. A process is also provided for applying ink to a thermoplastic substrate involving ultraviolet light curing of the ink. The thermoplastic compositions are useful for making article which contain UV sensitive phosphites for oxidative stability and also exhibit resistance to ultraviolet light yellowing of the phosphite. The inking process resists detrimental yellowing of the composition upon exposure to high levels of ultraviolet light radiation.

Abstract: A process is provided for stabilizing thermoplastic particles with organic phosphite particles. The process involves applying a liquid, relatively low molecular weight, phosphite to the surface of thermoplastic particles. The particles exhibit hydrolysis compared to conventional phosphite shell/polymeric core structures. The particles may be molded into useful thermoplastic articles.

Abstract: A polyolefin composition is provided which is resistant to gas fading upon exposure to atmospheric pollutants. The compositions containing a stabilizing amount of a phosphite of the formula ##STR1## wherein Y.sup.1 is an alkyl, preferably t-butyl, and Y.sup.2 is t-butyl or sec-butyl. Fibers and films made from the composition exhibit improved fade resistance compared to fibers and films made from polyolefins stabilized with various other commercially available phosphite. The compositions also contain an additive selected from hindered phenolic antioxidants and hindered amine light stabilizers.

Abstract: A polymerization process is provided involving a carrier solution containing an organic solvent and a phosphite. The phosphite is highly soluble in the solvent and allows for an incorporation of a minimum of solvent in the carrier sohltion. The phosphite is of the formula: ##STR1## wherein Y.sup.1 is an alkyl and Y.sup.2 is selected from tert-butyl and sec-butyl. The process is useful for making polymers such as styrene-butadiene block copolymers which may then be molded to produce commercial articles or may be blended with other thermoplastics to enhance the impact strengths thereof.

Abstract: A solid amorphous phosphite stabilizer composition is provided which exhibits enhanced hydrolytic stability. The stabilizer composition preferably contains from 10 to 99.9 percent by weight of a phosphorous compound selected from phosphites and phosphonites, and preferably contains from 0.1 to 10 percent by weight of an aliphatic polyamine. The stabilizer composition exhibits enhanced hydrolytic stability, and is preferably in the form of powders or flakes. The stabilizer composition is useful as an additive to polymeric resins as an antioxidant stabilizer.

Abstract: Neoalkyl phosphite provided which exhibit improved levels of stability. The phosphites are hindered and are useful in stabilizing thermoplastic compositions.

Abstract: Neoalkyl alkylidene-2,2'-bisphenyl phosphite esters are provided. The phosphites exhibit enhanced thermal and hydrolytic stability, and are useful as additives in thermoplastic resin compositions to enhance the thermal oxidative stability thereof.

Abstract: A phosphite is provided having the formula: ##STR1## wherein Y.sup.1 is an alkyl group and Y.sup.2 is selected from the group consisting of sec-butyl and tert-butyl. The phosphite exhibits enhanced stability including hydrolytic and UV stability, and is useful in stabilizing thermoplastic compositions.

Abstract: An organic phosphite composition is provided comprising organic phosphite particles having organic phosphite cores coated with an aminofunctional organic polysiloxane. Blends of the phosphite and the aminofunctional organic polysiloxane are also provided. The phosphite particles exhibit high levels of resistance to hydrolysis and are useful as antioxidant additives for thermoplastic compositions.

Abstract: An organic phosphite composition is provided comprising organic phosphite particles having organic phosphite cores coated with an organic hydrogen polysiloxane. The phosphite particles exhibit high levels of resistance to hydrolysis and are useful as antioxidant additives for thermoplastic compositions.