Masterbatches for Films:

1
Masterbatches for Films

• Getting Packaging Films into Shape

2
Very Broad Range of Standard Products for
Blown, Cast and BOPP

• Antiblock
• Slip
• Antistatic
• Processing Aid
• AF

3
Antiblock Additives Mode of Action

• Particles are added into the film surface
• 1. Surface roughness in increased so air can
  enter between film layers
• 2. Sticky Polymer rests are absorbed and
  neutralized
• Blocking of film layers is prevented

4
Antiblock AdditivesImportant properties

• Type of Filler (Antiblocking,
  Optics)
• Geometric Form (Antiblocking, COF)
• Medium Particle Size (skin thickness, optics)
• Upper Cut off (film thickness)
• Adsorption Capacity (migrating additives)

5
Antiblock Masterbatches applications

• Blown, Cast, BOPP
• Mono-layer or Multi-layer
• Metallized film (BOPP)
• Special effects

6
Antiblock Masterbatches

• Different Inorganic Fillers
• Special Organic Additives
• Particle Size Adjusted to Application
• Special Surface Properties
• Additive loadings, high for good economics, low
  for sensitive applications

7
FTIR-FOURIER TRANSFORM INFRA RED
8
Mode of Action
9
Slip AdditivesImportant properties

• Type of Additive (Migrative / Non migrative)
• Molecular Weight (Chain length)
• Purity (Chain distribution)

10
Chemistry of Slip agents
11
Effect of Slip agent in PE films
12
Slip Masterbatches

• Fast / Slow Migrating
• Non migrating
• Hot slip
• Combined (Fast/Slow, Slip/AS, Slip/AB)

13
Effect of Slip agent in PP films
14
Classification of Anti - Static properties
15
Measuring Resistivity
16
Model concept of internal Antistatic agents
17
Migrative AntistaticMode of Action
18
Anti - Static Masterbatches

• Migration regime
• Printability
• Food Contact
• New types of additives
• Slip properties

19
Processing Aid Masterbatches

• Improve the processability
• of most plastics
• Eliminate Melt fracture (Shark skin / Orange
  peel) in blown films
• Delay Die built up
• Increased Output rates
• Reduce Gel formation and improve Gloss Surface

20
Processing Aid Masterbatches

• Standard type
• For polyolefin extrusion processes
• Product choice depending on temperature, additive
  package,
• High shear type
• High percentage of fillers
• Low MFI polymers
• Also PS, PUR, ABS,

21
Summary of Heat Seal, Printability Ink
Adhesion Tests

• PPAs do NOT adversely affect
• Heat sealing properties
• Minimum sealing temperature is not affected
• Printing and Ink Adhesion
• No voids of color left on substrate in any
  instance
• Adhesion improved 24 hours after printing

22
Anti - Fog Masterbatches
23
What is fog?

24
Reasons for fogging

• Differences in the surfaces tension
• Water droplet 70 mJ/m2
• Polyolefin film surface lt 30 mJ/m2
• Temperature of the inside surface of the film is
  lower than the dew-point of the enclosed
  air/water vapour mixture

25
Effect on Light transmission
26
Effect of Fog Formation

• Agriculture film
• Reduced light transmission with consequent
  reduction in growth and crop yield
• Focused light and heat with consequent plant
  damage, burns from lens effect
• Coalescence of small drops to larger ones with
  consequent water dripping

27
Effect of Fog Formation

• Food packaging
• the content of the package is no longer visible
• the quality of the content is aesthetically
  reduced and no longer attractive to a potential
  buyer

28
Anti-fogging additives
Fig. 3
29
Fig. 4
Fig. 5
30
Evaluation of hot/cold tests
31
Evaluation of hot/cold tests
32
Summary of Laboratory Evaluation tests

• Most commonly used
• Cold fog test (4oC, over a glass of water)
• Hot fog test (60oC, over a glass of water)
• Additional
• Wetting angle
• Surface tension of film
• Haze

33
Anti - Fog Wetting Angle of water droplets on PE
films
0.4 additive
34
Getting the relevant info your part of the job

• Process type and application
• What is the problem to be solved !!!
• Equivalent product used ( addition, sample)
• Polymer type and MFI
• Mono / multilayer
• Regulative requirements (food contact)
• Special needs