Non-dust blend
The present invention concerns a non-dust blend comprising tris(2-t-butylphenyl) phosphite.
1 . A non-dust blend comprising granules comprising tris(2-t-butylphenyl) phosphite and one or more of:
i. a phenolic antioxidant;
ii. a sulphur-containing antioxidant;
iii. an aminic antioxidant;
iv. a UV stabiliser, optionally comprising a hindered amine light stabiliser (HALS) and/or a UV absorber;
v. a metal carboxylate;
vi. a clarifying agent and/or a nucleating agent;
vii. a secondary inorganic antioxidant or reducing agent; and/or
viii. an inorganic acid scavenger,
wherein the tris(2-t-butylphenyl) phosphite has a purity of at least 98%.
2 . The non-dust blend according to claim 1 , wherein the amount of dust in the non-dust blend is less than about 1% by weight of the non-dust blend.
3 . The non-dust blend according to claim 1 , wherein the tris(2-t-butylphenyl) phosphite is obtainable or obtained by adding 2-t-butyl phenol to a phosphorus trihalide.
4 . The non-dust blend according to claim 3 , wherein the 2-t-butyl phenol is added to the phosphorus trihalide by subsurface addition.
5 . The non-dust blend according to claim 3 , wherein the addition of 2-t-butyl phenol to the phosphorus trihalide is conducted in the presence of a catalyst.
6 . The non-dust blend according to claim 5 , wherein the catalyst has the formula NR 1 R 2 R 3 wherein R 1 is H or an optionally substituted hydrocarbyl group and R 2 and R 3 , which may be the same or different, are both optionally substituted hydrocarbyl groups of carbon chain length >1; and/or
wherein the catalyst has a cation and an anion, the cation having the formula N + R 1 R 2 R 3 R 4 wherein R 1 to R 4 , which may be the same or different, are optionally substituted hydrocarbyl groups having >1 carbon atoms.
7 . The non-dust blend according to claim 1 , wherein di(2-t-butylphenyl) monophenyl phosphite contributes below 1% by weight of the total phosphorus present in the non-dust blend.
8 . The non-dust blend according to claim 1 , comprising a phenolic antioxidant and one or more of components ii. to viii.
9 . The non-dust blend according to claim 1 , wherein the phenolic antioxidant comprises a fully hindered phenolic antioxidant.
10 . The non-dust blend according to claim 9 , wherein the fully hindered phenolic antioxidant comprises tetrakismethylene(3,5-di-t-butyl-4-hydroxyhydrocinnamate) methane; 2,2′thiodiethylene bis[3(3,5-di-t-butyl-4-hydroxyphenyl)propionate]; octadecyl 3-(3′,5′-di-t-butyl-4′-hydroxyphenyl)propionate; 1,3,5-tris(3,5-di-t-butyl-4-hydroxybenzyl) isocyanurate; 1,3,5-trimethyl-2,4,6-tris(3,5-di-t-butyl-4-hydroxybenzyl)benzene; N,N′-hexamethylenebis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionamide]; 1,2-bis(3,5-di-t-butyl-4-hydroxyhydrocinnamoyl)hydrazine; 2,2′-ethylidenebis[4,6-di-t-butylphenol]; butylated hydroxytoluene; and/or compatible mixtures of two or more thereof.
11 . The non-dust blend according to claim 1 , wherein:
the metal carboxylate comprises one or more of a metal stearate and/or a metal lactate;
the clarifying agent and/or a nucleating agent comprises a metal benzoate and/or a sorbitol derivative;
the secondary inorganic antioxidant comprises one or more of a metal hypophosphite, a metal thiosulphate, a metal bisulphite, a metal metabisulphite and/or a metal hydrosulphite; and/or
the inorganic acid scavenger comprises one or more of a metal oxide, a metal hydroxide, a metal carbonate, a metal carboxylate, a metal salt and/or a hydrotalcite.
12 . A process for forming the non-dust blend according to claim 1 , comprising the steps of:
a. extruding tris(2-t-butylphenyl) phosphite, and the one or more other additives, to provide a substrate;
b. cooling the substrate; and
c. optionally fragmenting the cooled substrate.
13 . The process according to claim 12 , wherein the extruder comprises a plurality of heating zones.
14 . The process according to claim 12 , wherein the extruder comprises a die maintained at a temperature which deviates by no more than ±5° C. from the melt temperature of tris(2-t-butylphenyl) phosphite.
15 . The process according to claim 12 , wherein the process additionally comprises the step of removing dust by sieving.
16 . The process according to claim 12 , wherein the extruding step comprises a cold extrusion and wherein the process additionally comprises compaction.
17 . A stabilised polymeric composition comprising a polymer and the non-dust blend according to claim 1 .
18 . The stabilised polymeric composition according to claim 17 , wherein the non-dust blend is present in an amount of from about 0.01 wt. % to about 5 wt. % based on the total weight of the stabilised polymeric composition.
19 . An article manufactured from the stabilised polymeric composition according to claim 18 .