Get instant access to Irganox® L technical datasheet. It is a multifunctional liquid phenolic antioxidant for processing and long-term thermal stabilization. Multifunctional phenolic antioxidant for processing and long-term thermal stabilization of elastomers, plastics and related products. NameMethyl-4,6-bis(octylsulfanylmethyl)phenol,CASProperties: Molecular Fomula:C25H44OS2,Molar Mass,Densityg/cm 3.
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Collectively these compounds which may react to produce chromophores are referred to herein as color-forming compounds CFC.
Additionally the Hunter igganox measures the yellowness index 15200 YI. The numerical results of these experiments are given in Table 2. For example IRGANOX may be present in an elastomer formulation in an amount of from ppm to ppm, alternatively from ppm to ppm by weight of the elastomer, alternatively from ppm to ppm, alternatively from ppm to ppm, alternatively ppm by weight of the elastomer.
The method of claim 1 wherein the antioxidant is present in an amount of from ppm to 10, ppm. Blends or copolymers of the diene monomers may also be used. Alternatively, the reaction mixture comprises styrene and an oxidizing agent. Yellowness indices are used chiefly to measure these types of degradation.
The method of claim 1 wherein the elastomer is a polymer of an 11520 conjugated diene.
Organic polymeric materials stabilized with acylated hydroxy acid type compounds. For example, the polymerization reaction may be carried out in a reactor system employing a first and second polymerization reactors that are either continuously stirred tank reactors CSTR or plug-flow reactors.
In an embodiment the reaction process begins with a reaction mixture comprising styrene, a CIA, an elastomer having at least one antioxidant, and optionally additional components such as those described herein or as known to one of ordinary skill in the art.
In yet another embodiment, the polymerization reaction may be carried out in a plurality of reactors with each reactor having an optimum temperature range. Such antioxidants may react with metals present in the polymeric reaction mixture such as iron or zinc to produce color-forming compounds CFCs.
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The method of claim 4 wherein the calcium stearoyl lactate is present in an amount of from ppm to ppm. Both alternatives are intended to be within the scope of the claim. We’re sorry, but the industry you have selected is not currently available in your chosen language. In an embodiment, the styrenic polymer composition comprises an initiator or the byproducts of an initiator reaction. The method of claim 1 wherein the oxidizing agent is a metallic stearate, an initiator, air or combinations thereof.
In one embodiment, both a metallic stearate e. The method of claim 1 wherein the styrene is a substituted styrene, a ring-substituted styrene, a disubstituted styrene, an unsubstituted styrene or combinations thereof.
irganox 1520 equivalent
Said CIA may be the salt of an organic acid, alternatively an alkali salt of an organic acid, alternatively an alkali salt of lactic acid, alternatively sodium stearoyl lactate, alternatively calcium stearoyl lactate CSL or combinations thereof.
In Equation 1, the metallic stearate, in this case zinc stearate ZnSt is believed to lower the activation barrier by which the antioxidant IRGANOX reacts to produce a chromophore as an undesirable color adduct.
Any process known to one of ordinary skill in the art for the production of a styrenic polymer composition may be employed. In an embodiment, the antioxidant is a phenol, a catechol, or combination thereof. The effect of changing the peroxide initiator package and elastomer on the color of the HIPS resin produced was investigated.
Mass polymerization, also known as bulk polymerization refers to the polymerization of a monomer in the absence of any medium other than the monomer and a catalyst or polymerization initiator.
A process for the preparation of rubber-reinforced monovinylidene aromatic polymers. The reaction temperatures and pressures necessary for devolatilization will depend to some extent on the nature of the reactor and reaction conditions used and may be determined by one of ordinary skill in the art.
Styrene is widely commercially available and as used herein the term styrene includes a variety of substituted styrenes e. In some cases; the antoxidants employed are less amenable to the process than those typically employed in HIPS production thereby compounding the amount of such compounds present in the HIPS production process and the discoloration of the polymer. In an embodiment, the CIA may be present in amounts of from ppm to ppm, alternatively from ppm to ppm, alternatively from ppm to ppm, alternatively from ppm to ppm.
Disclosed herein is a method of improving the color of a high impact polystyrene comprising preparing a reaction mixture comprising styrene, elastomer and at least one antioxidant, and introducing to the reaction mixture a color improving additive prior to the addition of any oxidizing agents to the reaction mixture.
Improved methods of making styrenic polymeric compositions and methods of using same. We will find the most reliable suppliers for you according to your description. Initiators, sometimes referred to as accelerators, are compounds that function as the source of free radicals to enable the polymerization of styrene.
In an embodiment, the styrenic polymer composition contains at least one antioxidant. Process for the stabilization of a stabilizer mixtures for recycled plastic mixtures.
Where numerical ranges or limitations are expressly stated, such express ranges or limitations should be understood to include iterative ranges or limitations of like magnitude falling within the expressly stated ranges or limitations e.
In an embodiment, the polymerization of styrene is carried out in a solution or mass polymerization process. Such HIPS contain an elastomeric phase that is embedded in the polystyrene matrix resulting in the composition having an increased impact resistance.
Please send me detail product specification, thank you! This type of interaction is believed to accelerate the oxidation of the antioxidant species to a highly-colored quinone-type structure. In an embodiment, the use of a CIA such as CSL may reduce color formation in HIPS comprising of one or more oxidizing agents such as peroxides, hydroperoxides or peroxide mixtures, metallic stearates or combinations thereof.
The CIA may be included in the reaction mixture which enters the prepolymerization reactor. When the prepolymer reaches the desired conversion, it may be passed through a heating device into a second reactor for further polymerization.
For example, the styrenic polymer composition can be prepared irgznox an upflow reactor. Alternatively, a styrenic polymer composition comprises a polymer of styrene, an elastomer and a CIA. For example, during the production of butadiene antioxidants are often included as stabilizers. Are you a distributor who is interested in being listed here?
It is also effective in various adhesive, sealant and latex applications.