Thermoplastic Elastomer Compositions Comprising Intumescent Flame Retardants and Non-Phosphorous-Based Flame Retardant Synergists

Example 1

Sample Compositions

[0079]This example demonstrates the synergistic effect of carbon black in a flame retardant composition. For this example, three flame resistant compositions are made according to the formulations shown in Table 1. The amounts listed in the table are weight percentages (wt. %) based on the total weight of the composition.

TABLE 1Effect of Carbon Black on Flame ResistanceExample:-1-2-3Base CompositionDow TPU 2355-75A (adipate)34.9134.9134.91Elvax 40L-03 (40% VA, 3MI)11.2811.2811.28Elvax 265 (28% VA / , 3MI)7.527.527.52Amfine FP-2100J46.0046.0046.00Irgafox 1680.100.100.10Irganox 10100.200.200.20DFDA-0038 Carbon Black MasterbatchAdded as pellet blend with base (parts)1.003.005.00containing master batch resin (parts)0.601.803.00containing carbon black (parts)0.401.202.000.085″ insulation diameter on 18AWG Stranded ConductorUL-94 VW-1 Wire Burn test# pass / # total0 / 32 / 33 / 3un-charred lendth below flag0.063.388.3

[0080]Pellethane® 2355-75A is an adipate-type t

Sample Compositions

[0085]This example demonstrates the synergistic effect of silica, zinc oxide and titanium dioxide on a flame retardant composition. For this example, each composition was formulated from a polymer base according to the formulation shown in Table 2A.

[0086]Tables 2A and 2B show the effect of the various metal oxide burn synergists on a TPU-based composition incorporating ethylene-vinyl acetate co-resins and Adeka FP-2100J intumescent flame retardant additive. The amounts listed in Tables 2A and 2B are weight percentages based on the total weight of the composition.

TABLE 2AThermoplastic TPU Based Intumescent “Base A”Dow TPU 2355-75A (adipate)40.12Elvax 40L-03 (40% VA, 3MI)7.08Reofos BAPP10.00Amfine FP-2100J42.50Irgafox 1680.10Irganox 10100.20

[0087]Base A is prepared by conventional mixing and heating to about 180° C. batch temperature on Banbury 1A pilot plant mixer with extruder / pelletizing system. This “Base A” material is then used as base for laboratory batch mixi

UV Stable, Flame Retardant Compositions Based on a TPU / EVA Blend

[0094]This example demonstrates the dramatic benefit to UV stable color performance obtained from incorporation of very high titanium dioxide loadings into flame retardant composition. For this example, each composition was formulated from one of three polymer bases according to the formulation shown in Table 3. The amounts listed in the table are weight percentages (wt. %) based on the total weight of the composition.

TABLE 3Base MaterialsBase MaterialsBase #1Base #2Base #3Dow Polyurethane28.9027.3325.772102-75AElvax 265 (28% VA / 28.9027.3325.773MI)Amfine FP-2100 J41.5041.641.6Stabaxol P0.500.500.50Irganox 10100.200.200.20DuPont R350 TiO2none3.046.16

[0095]Pellethane 2102-75A is polycarprolactone ester based thermoplastic TPU from the Lubrisol Corporation, with nominal 75 A shore hardness, and a melt flow rate of about 25 @ a 224° C. / 1.2 kg test condition. Stabaxol P is an aromatic carbodiimide antihydrolysis TPU stabi