Granular polymer additives and their preparation

A process of producing a compacted particulate polymer additive composition in a dry granular form, which process comprises:

• 1) forming a paste from (a) at least one particulate organic phosphite, organic phosphonite, or organic phosphonate, (b) one or more particulate polymer additives other than an organic phosphite, organic phosphonite, or organic phosphonate, and (c) an inert organic processing solvent that can be vaporized at a temperature below the lowest melting point or initial melting temperature of (a) and (b);
• 2) compressing and shaping the paste while preventing or substantially preventing melting of solids used in forming the paste, to produce a wet compacted composition in granular form;
• and
• 3) drying said wet compacted composition in granular form by vaporizing said processing solvent therefrom to form the dried compacted particulate polymer additive composition in a granular form.

A compacted particulate polymer additive composition in a dry granular form, formed by a process which comprises:

• 1) forming a paste from (a) at least one particulate organic phosphite, organic phosphonite, or organic phosphonate, (b) one or more particulate polymer additives other than an organic phosphite, organic phosphonite, or organic phosphonate, and (c) an inert organic processing solvent that can be vaporized at a temperature below the lowest melting point or initial melting temperature of (a) and (b);
• 2) compressing and shaping the paste while preventing or substantially preventing melting of solids used in forming the paste, to produce a wet compacted composition in granular form;
• and
• 3) drying said wet compacted composition in granular form by vaporizing said processing solvent therefrom to form said additive composition in a dry granular form;
• said additive composition in a dry granular form having compressive hardness and physical integrity resulting exclusively or substantially exclusively from dried desolvated at least partially solvated particles of (a), and optionally from dried at least partially solvated particles of (b).

A process of producing a compacted particulate polymer additive composition in a dry granular form, which process comprises:

• 1) forming a paste from (A) one or more components selected from the group consisting of (i) particulate organic phosphite, (ii) particulate organic phosphonite, (iii) particulate organic phosphonate, and (iv) a mixture of any two or all three of (i), (ii), and (iii), and (B) an inert organic processing solvent that can be vaporized at a temperature below the lowest melting point or initial melting temperature of said one or more components of (A);
• 2) compressing and shaping the paste while preventing or substantially preventing melting of solids used in forming the paste, to produce a wet compacted composition in granular form;
• and
• 3) drying said wet compacted composition in granular form by vaporizing said processing solvent therefrom to form the dried compacted particulate polymer additive composition in a granular form.