additives feature | Film applications
a DE replacement Altiblock D900 can improve clarity while being equivalent in block force,” Trinity claims. Grace’s Sylobloc line of anti-blocking agents includes plain and combination silica products tailor- made for different fi lm thicknesses and polymer types. Sylobloc 45B is its most recent addition. Grace says that this synthetic silica has been optimized for improved dispersibility and handling. It claims this results in “more uniform masterbatches as well as excellent, and consistent fi lm quality”. The company says that a tightly controlled particle
Tensile Strength (machine direction) of 25µm m-LLDPE fi lm containing various anti-block minerals including Imerys Mistroblock
size distribution and absence of coarse particles improves optical properties and anti-blocking effi ciency. It adds that fi lm producers and masterbatchers suffering from dispersibility problems can now benefi t from the optimized pore volume of Sylobloc 45B silica that delivers better dispersion. The high pore volume of Sylobloc particles results in a greater number of particles per unit weight, says John Gilbert, vice president of materials technologies at Grace. The number of particles per unit mass is shown to increase substantially with increasing pore volume. “Consequently, a much lower amount of anti-blocking agent compared to naturally occurring, crystalline non-porous anti-blocking agents is required to reach the desired anti-blocking effect,” he concludes. Grace has also developed numerous silica and organic additive blends in response, it says, to the ever-increasing focus on process optimization, health and safety, and the environment.
Anti-slip agents
The impact of silica loading in a masterbatch on dispersion (2,000 ppm SiO2 in PP fi lm): Grace Sylobloc 45B shows better dispersion than the synthetic silica anti-block
The newest addition to Croda’s range of additives for fi lm applications is Incroslip SL. This provides both high slip performance and long-term oxidative stability to protect against undesired changes in taste and colour in consumer-sensitive applications.
“Traditionally, polymer slip additives offer the
practical benefi ts of easier processing and handling, but under stressed conditions, like heat or UV exposure, these additives can break down and negatively affect the end performance,” says Croda. “Attributes such as feel, odour and taste of the packaging or contents can sometimes be compromised.” The company claims that Incroslip SL offers high, long-lasting slip benefi ts for improved performance, while maintaining the stability to preserve product quality.
The refractive index of Trinity’s Altiblock compared to DE, talc and NS 34 COMPOUNDING WORLD | January 2015
Jill Ullathorne, Croda’s polymer additives marketing manager, says: “Incroslip SL is a truly new and innovative product, delivering slip properties similar to erucamide coupled with the high stability of behena- mide. We are seeing regular new approvals for this material in a wide variety of applications ranging from
www.compoundingworld.com
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86 |
Page 87 |
Page 88