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Additives for plastics

REPI offers a range of additives for the packaging industry and for industrial applications that act on performance, protection and aesthetics. Additives for thermoplastics can be combined with colours to offer an integrated solution. The high concentration of active ingredients and dosing precision offer the user flexibility and reliability in use.

Better performance of the production process: greater machine productivity, less waste and less energy use. This leads, as a result, to cost efficiency and therefore to a more competitive finished product.

Greater protection of the product or the content of a plastic packaging: depending on the final application, it may be necessary to protect the product from aging due to exposure to atmospheric phenomena. When it comes to packaging, there is also the need to protect its contents, in particular all those photosensitive products such as fruit juices, milk, detergents of various kinds.

Advanced aesthetics: REPI liquid additives, alone or in blends with liquid colours, are able to make the product bright and shiny, avoiding yellowing or alterations in shade caused by exposure to atmospheric phenomena.

REFIT for recycled PET – a range of additives dedicated to r-PET to support the transition to a circular economy .

The additives for Thermoplastics

STABIPLUS™
ANTI YELLOW
OPTICAL BRIGHTENERS
IV ENHANCERS
BLOWING ADDITIVES
AA REDUCERS
UV ABSORBERS
PROCESS AIDS
XPANSOR™
THE REFIT CONCEPT

STABIPLUS™

Protect quality of PET recycling stream while opening up wider window for sustainability.
The additive acts as a proactive stabilizer that prevents polymer from aging, cycle after cycle.
  • Protect PET from discoloration (such as yellowing and darkening) during recycling and processing
  • Limit the drop of L* value of polymer
  • Remain active for future recycling cycles
  • No impact on IV performance
  • Offer max flexibility: dosage may vary according to application
  • Widen the window for sustainable use of recycled PET

ANTI YELLOW

The range of REPI ANTI YELLOW additives comprises different formulations able to balance the appearance of r-PET and regain brightness, as well as to correct off-shade raw materials, restoring the look as it was virgin. Formulations are available for injection moulding of preforms and extrusion of sheets. Concentrated formulations to be used during r-PET pellets production complete the range.
  • Reduce the yellow index (b value of CIELab coordinate)
  • Stabilise the grey shades (L value of CIELab coordinate)
  • Stabilise the red/green shades (a value of CIELab coordinate)
  • Improve aesthetics of recycled PET
  • Low viscosity liquid
  • Let down ratio: 0,01 – 0,05%
  • Meet EU and FDA food contact regulation
  • Suitable for standard liquid dosing units
  • Can be blended with liquid colours and additives
  • Shelf life: 6 months, in sealed containers
  • Standard package: 25, 50 and 200 kg drums, 1 ton IBC container. Customized solutions available on request

OPTICAL BRIGHTENERS

OPTICAL BRIGHTENERS are often used to boost brightness and gloss of PET and rPET packaging and enhance its whiteness when coloured.
Especially when used in combination with recycled PET, REPI's OB prevent L* drop.
OB are part of the REFIT range, composed of Additives and Colours dedicated to recycled polymers.
  • Increase gloss (bright shades)
  • Enhance the whiteness
  • Low viscosity liquid
  • Let down ratio: 0,2 – 0,3%
  • Meet EU and FDA food contact regulations
  • Suitable for standard liquid dosing units
  • Can be blended with liquid colours and additives
  • Shelf life: 6 months in sealed containers.
  • Standard package: 25, 50 and 200 kg drums, 1 ton IBC container. Customized solutions available on request

IV ENHANCERS

R-PET has normally a lower Intrinsic Viscosity than virgin PET. For applications requiring higher mechanical properties these additives can be a valid aid. REPI IV ENHANCERS are chain extenders that increase molecular weight and mechanical properties of r-PET accordingly.
IV increase IV over 0,05 dl/g.
REPI IV ENHANCERS are available in liquid and in solid masterbatch forms.
  • IV increase from 0,05 dl/g to over 0,10 dl/g depending on the LDR
  • Balance of IV “peak” – it gives more homogeneity to final mixed resins
  • No cross link: they enable the molecular weight (MW) and mechanical properties to increase accordingly
  • High thermal stability, no black specks
  • Let down ratio: 0,06 – 0,3%
  • Meet EU food contact regulations
  • Shelf life: 12 months in sealed containers
  • Standard package: 25kg drum

BLOWING ADDITIVES

REPI BLOWING ADDITIVES (BA) are specifically designed to be an aid during the blow moulding process of preforms, espcially thick and special shaped ones. The different formulations enable PET preforms to be homogeneously reheated, due to better infrared absorption and as a result better blown.
The use of REPI BLOWING ADDITIVES can lower blowing energy costs and reduce percentage of scraps, while leaving productivity unaltered when not even increased.
Remap BA additives can be used as alternatives to fast re-heat resins.
  • Improve heat absorption
  • Energy saving (5-15% depending on preform design and weight, and on blowing machine settings)
  • Improve productivity
  • Reduce scraps
  • Reduce scraps
  • Low viscosity liquid
  • Let down ratio: 0,02 – 0,05%
  • Meet EU and FDA food contact regulations
  • Suitable for standard liquid dosing units
  • Can be blended with liquid colours and additives
  • Shelf life: 6 months, in sealed containers
  • Standard package: 25 and 50 kg drums. Customized package solutions available on request

AA REDUCERS

The presence of acetaldehyde (AA) in PET packaging is a critical parameter affecting the taste of water.
The SenzAA™ additives can reduce the levels of acetaldehyde in PET preforms by more than 75%.
SenzAA™ additives (AA) are available both in liquid form and in granules.
  • Can reduce AA by more than 75%, at the recommended loading levels
  • Preserve natural taste of water
  • No black specks, no plate-out, no sublimation
  • Suitable for bottle to bottle recycling
  • Meet EU food contact regulations
  • Suitable for standard liquid dosing units
  • Can be blended with REPI liquid colours
  • Shelf life: 3 months, in sealed containers for the liquid version; 1 year for the solid masterbatch version
  • Standard package: 25 and 50 kg drums. Customized solutions available on request

UV ABSORBERS

UV radiation is one of the causes of alteration in taste, smell, colour and biological characteristics of products packaged in PET.
Many products contain light sensitive ingredients and PET alone is not enough to protect them from degradation. Several grades of REPI UV ABSORBERS are available to cover the different protection requirements according to final product needs.
REMAP UV ABSORBERS capture UV radiation from 300 to 400 nm, proving different levels of protection, depending on the LDR and the packaging wall thickness.
  • UV radiation absorption: 300-400 nm
  • Low viscosity liquid
  • No influence on the natural transparency
  • Let down ratio: 0,05 – 0,20%
  • Meet EU and FDA food contact regulations
  • Suitable for standard liquid dosing units
  • Can be blended with liquid colours
  • Shelf life: 6 months, in sealed containers
  • Standard package: 25, 50 and 200 kg drums, 1 ton IBC container. Customized solutions available on request

PROCESS AIDS

REPI PROCESS AIDS are normally added during the injection molding process and migrate on the surface of the preform, providing therefore an anti-scratch protection. The preforms are also positioned in a more orderly way during the packing phase dealing to optimised storage.
  • Improve process productivity
  • Enhance process parameters stability
  • Optimise preform storage (+5-10%)
  • Reduce static charge
  • Reduce scratches
  • Low viscosity liquid
  • Let down ratio: 0,12%
  • Meet EU and FDA food contact regulations
  • Suitable for standard liquid dosing units
  • Can be blended with liquid colours and additives
  • Shelf life: 6 months, in sealed containers
  • Standard package: 25, 50 and 200 kg drums, 1 ton IBC container. Customized package solutions available on request

XPANSOR™

Chemical foaming agents are used in many thermoplastic applications with the aims of reducing weight of PVC large parts, making logistics easier and lowering costs. The balance between density reduction and cell structure size is key factor. XPANSOR™ enables maintaining physical (strength) and aesthetic (surface smoothness) properties of the final part in order to achieve the required specifications. XPANSOR™ liquid foaming additives are single or a blended combination of exothermic and endothermic active chemistries. Light weighting is achieved by adding XPANSOR™ into the feed throat during processing, at specific temperature. The gas created by the chemical activation is held within the melt during polymer cooling resulting in a part with a foamed cell like structure. Typical application: free foam PVC sheets and profiles for the advertisement, signing and digital print industries. For siding, decking, moulding and pipes.
  • Smoother surface finish and enhanced cell structure
  • Lower density without compromising physical properties and performance
  • Tight cell structure
  • Tailor-made solutions according to polymer, specific processing conditions and customer’s specifications

THE REFIT CONCEPT

The REFIT range, brand The REFIT range, a brand created by REPI in 2019 in response to the need for a circular economy, is made up of additives and colours that facilitate the use of r-PET since they improve its aesthetics and its performance .
ANTI YELLOW additives are a series of formulations that correct the shade of recycled PET by acting on Lab* values, the various formulations improve the greyish, green or red shades typical of a recycled PET blends.
The OPTICAL BRIGHTENERS act as well on aesthetics of the polymer, bringing the L* values back to the levels of a virgin PET. These additives can be combined with colours or with Anti Yellow.
The IV Enhancers are a valuable aid to the performance of an r-PET product. The additive lengthens the molecular chain of recycled PET, bringing its intrinsic viscosity back to the levels of a virgin PET.
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