Release modifier composition
A composition, modifier technology for adhesives, film/sheet adhesives, shipping and packaging
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Embodiment 1-4
[0070] Table 1 details the physical properties of the silicones used in the release modifier compositions of Examples 1-5. The release modifier compositions of Examples 1-5 are shown in Table 2, and the respective physical properties are shown in Table 3. These release modifiers were formulated as release coatings, as shown in Table 4. Vinylsiloxane SL6900 available from Momentive Performance Materials is a vinyl terminated dimethylsiloxane having a viscosity of about 100 centipoise to about 160 centipoise. SL5030 from Momentive Performance Materials was chosen as a comparative release modifier. The comparative release modifier was a 1.4 wt% vinyl high potency release modifier with about 60 wt% vinyl functional MQ resin and 35 wt% alpha-olefin. Disadvantages of the comparative release modifiers include foaming during coating, and excessive oxidative emissions / oxidizers from high concentrations of alpha-olefins in the curing oven.
[0071] The formulation was coated on cello...
Embodiment 5-12
[0082] The release modifiers CRA#3 and CRA#4 from Examples 3 and 4 were further evaluated for release modifier efficacy at different concentrations, as shown in Tables 5 and 6. These release modifiers were compared to commercially available modifiers SL5030 (described in Examples 1-4) and SL6030 (Comparative Example 2). SL6030 is composed of 42% by weight vinyl terminated siloxane, 50% by weight vinyl functional MQ resin, and 8% by weight alpha-olefin at about 200-300 centistokes. SL6030 is not as effective as SL5030 as a release modifier. Also, SL5030 and SL6030 produced foam during coating operations, but SL6030 emitted lower amounts of volatiles, which were oxidized and released into the atmosphere.
[0083] Tables 5 and 6 show release modifier compositions containing low viscosity silicone-hydride polysiloxanes. The low viscosity silicone-hydride polysiloxanes provide improved release force modification over prior art modifiers. This is further shown in Table 7, where t...
Embodiment 13
[0091] Release modifier CRA#5 was prepared as previously described and the composition is shown in Table 8. The viscosity at 92.0 wt% solids was 5,683 cps and the wt% vinyl was 1.56 with 0.1296 wt% hydride. This modifier was formulated into the release coatings shown in Table 9, which also shows Comparative Example 1. The formulation was diluted to 20% by weight solids in heptane and spread onto cellophane using a No. 3 Myer rod. The next day Tesa 7475 was applied and aged at 70°C for 20 hours. At the same silicone resin content in the release coating formulation, CRA#5 showed higher release force than the control SL5030.
[0092] Use Siloxane M Vi D. 20 m Vi Release coatings were prepared with Surfynol S-61 inhibitor, SS4300c (1 wt % hydride homopolymer), with SiH / Vi = 1.9, 125 ppm platinum diluted in heptane. The peel force was determined to be 18 g / 25mm, which is similar to the SL6900 formulation without modifier. However, when the release modifier composition includ...
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