CJ has filed a patent for a method of producing a masterbatch that includes an amorphous or semi-crystalline polymer and amorphous polyhydroxyalkanoate (aPHA). The method involves feeding aPHA in two or more split feedings during the blending process, with the first feeding comprising 1-15 wt % and the second feeding comprising 30-49 wt %. The resulting masterbatch contains discrete aPHA particles dispersed in the polymer. GlobalData’s report on CJ gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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Method for producing a masterbatch of polymer and apha
A recently filed patent (Publication Number: US20230312917A1) describes a method for producing a masterbatch that contains an amorphous or semi-crystalline polymer and amorphous polyhydroxyalkanoate (aPHA) dispersed in the polymer. The method involves feeding the polymer and about 1-15 wt % of aPHA to a primary feed, melting the primary feed, and then feeding about 30-49 wt % of aPHA to a secondary feed that is physically separated from the primary feed. The secondary feed is then combined with the melted primary feed, and the aPHA is dispersed in the polymer to obtain the masterbatch. The resulting masterbatch contains discrete aPHA particles dispersed in the polymer.
The masterbatch composition typically contains about 30-50 wt % of aPHA and about 50-70 wt % of the polymer. The polymer used can be selected from various options including polylactic acid (PLA), polybutylene succinate (PBS), polybutylene adipate terephthalate (PBAT), polyethylene-succinate (PES), polycaprolactone (PCL), semi-crystalline polyhydroxyalkanoate (PHA), or a combination thereof.
The blending operation to produce the masterbatch is carried out using a twin-screw extruder. The melting process is conducted at a temperature range of 155-220° C, while the dispersing process occurs at a temperature range of 140-180° C. After dispersing, the dispersion obtained by dispersing the aPHA in the melted polymer is cooled.
The discrete aPHA particles in the masterbatch have an average diameter of less than 3 µm. The aPHA used in the method can be a poly 3-hydroxybutyrate (P3HB) copolymer, such as poly 3-hydroxybutyrate-co-3-hydroxypropionate (PHB3HP), poly 3-hydroxybutyrate-co-4-hydroxybutyrate (PHB4HB), poly 3-hydroxybutyrate-co-4-hydroxyvalerate (PHB4HV), poly 3-hydroxybutyrate-co-3-hydroxyvalerate (PHB3HV), poly 3-hydroxybutyrate-co-3-hydroxyhexanoate (PHB3HH), or poly 3-hydroxybutyrate-co-5-hydroxyvalerate (PHB5HV).
The patent also describes a masterbatch composition that contains the continuous amorphous or semi-crystalline polymer and the discrete aPHA dispersed in the polymer. The aPHA is present in an amount of about 30 to 50 wt % based on the total weight of the masterbatch composition. The masterbatch composition can be used in various applications, including injection molding, extrusion, thermoforming, blow molding, or compression molding, to prepare amorphous or semi-crystalline polymer products.
In summary, the patent presents a method for producing a masterbatch containing a dispersed aPHA in an amorphous or semi-crystalline polymer. The method involves specific feeding, melting, and dispersing steps, and the resulting masterbatch has discrete aPHA particles with a small average diameter. The patent also describes the composition of the masterbatch and its potential applications in various polymer processing techniques.