Carbon Black for Package UV Protection
3 patents in this list
Updated:
Carbon black particles in packaging materials serve as critical UV blockers, but their effectiveness depends on precise control of particle size, dispersion, and loading levels. Current packaging applications require particles ranging from 13-43 µm in diameter, with surface areas up to 300 m2/g, while maintaining mechanical properties and preventing agglomeration that can compromise both protection and aesthetics.
The fundamental challenge lies in achieving optimal UV protection while managing the tradeoffs between particle loading, material processability, and final package performance.
This page brings together solutions from recent research—including thickness-dependent particle size distribution systems, high-surface-area carbon black composites, and advanced dispersion techniques with specific fillers. These and other approaches focus on practical formulations that balance UV protection with processing requirements and end-use performance.
1. Antistatic Packaging Film Comprising Polyethylene, Conductive Fillers, Antistatic Agents, Plasticizers, Plant Fibers, and Antioxidants
PAN JINGYI, 2022
Antistatic packaging film containing specific compositions of polyethylene, fillers, antistatic agents, plasticizers, plant fibers, and antioxidants to prevent accumulation of static electricity in plastic packaging bags. The antistatic agents are compounds like phosphites and phosphates that increase surface conductivity to rapidly discharge static charges. The fillers are conductive materials like nano-silicon dioxide or carbon nanotubes. The plant fibers and antioxidants are added for compatibility and stability. The formulations provide antistatic properties to prevent melting, burning, or damage from static electricity in plastic packaging applications.
2. Polypropylene Composite with High-Surface-Area Carbon Black and Specific Fillers for Enhanced Gloss and Low Dielectric Properties
KINGFA SCI & TECH CO LTD, 2021
Low-dielectric polypropylene composite material with high gloss and blackness. The material contains polypropylene, carbon black, calcium carbonate, and barium sulfate fillers. The carbon black has a nitrogen adsorption specific surface area of 300 m2/g for better dispersion and blackness without excessive addition. Calcium carbonate and barium sulfate fillers do not cover the carbon black and maintain gloss. This allows reducing dielectric constant compared to using lower surface area carbon blacks.
3. Carbon-Containing Plastic Packaging Material with Thickness-Dependent Carbon Particle Size Distribution
KOREA COMPOSITE TECHNOLOGY CO LTD, Korea Advanced Institute of Science and Technology Co., Ltd., 2015
Carbon-containing plastic packaging material with improved quality and reduced issues like foreign body sensation, clumping, and poor molding. The carbon powder particle size is adjusted based on the thickness of the molded plastic. For thinner packaging like bags (0.01-0.11 mm), carbon powder with an average diameter of 13 µm is used. For thicker packaging (0.12-2 mm), carbon powder with an average diameter of 28 µm is used. For very thick packaging (≥2 mm), carbon powder with an average diameter of 43 µm is used. The particle uniformity is also adjusted based on thickness. This prevents issues like foreign body sensation and clumping.
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