Polyolefin-based film with increased water vapor transmission rate
A water vapor transmission rate and polyolefin technology, which can be used in household appliances, medical equipment, packaging items, etc., and can solve the problems of expensive materials
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example 1
[0041] Use a Haake Rheocord mixing tank (Haake Polylabs Systems company) at 160 ℃ will have DOWLEX TM 2045G linear low density polyethylene (produced by Dow Chemical Company, density = 0.920 g / cc and melt index = 1.0 g / 10 minutes) and polyethylene glycol PEG CARBOWAX TM 8000 (manufactured by Dow Chemical Company in flake form, molecular weight range from 7000 to 9000 g / mol), Hansen solubility parameter is 33 MPa 1 / 2 , with uncoated CaCO 3 (Omya F-FL fraction available from Omya Inc., USA, median diameter = 1.4 μm, 60% finer than 2 μm, and 40% finer than 1 μm) or coated CaCO 3 (Omya FT-FL grades purchased from Omya, USA, coated with calcium stearate, median particle size = 1.4 μm, 60% finer than 2 μm, and 40% finer than 1 μm) The articles were melt blended for 10 minutes. The screw speed was set at 50 rpm. The compositions of the blends are listed in Table I by weight.
[0042] The blend was compression molded between two Mylar films using a Carver compression molding pr...
example 2
[0050] Following the procedure described in Example 1, the DOWLEX TM 2045G (as described in example 1), polyethylene glycol Carbowax TM 1450 (manufactured by The Dow Chemical Company in flake form, molecular weight range 1305 to 1595 g / mol) and uncoated with an average particle size of 1.1 microns and 95% finer than 4 microns (both measurements provided by Sedigraph). BuCaCO 3 (Hubercarb Q1 grade supplied by J.M. Huber, USA) were melt mixed and molded into samples of approximately 10 mil thickness. While films of this thickness are outside the scope of the present invention, the data demonstrate a trend towards increased WVTR at higher filler levels. WVTR is measured according to ASTM F1249-06 using a Mocon W700 measuring device at 38°C with 100% relative humidity on one side and 0% relative humidity on the other side. Although the data is not presented in the table, films made using blends of PEG and LLDPE but without any fillers showed no significant change in WVTR when...
example 3
[0054] Example 3: Blown film
[0055] Two formulations using the ingredients described in Example 1 were prepared via twin-screw extrusion compounding and made into blown films. Compounding was performed on a ZSK26 twin-screw extruder (L / D = 60 and D = 26 mm) at a melt temperature of about 280°C and an output rate of about 40 lb / h. The formulation ratios are given in Table III. The mixed pellets were dried at 80°C for about 12 hours to ensure that the residual moisture level did not exceed 50 ppm prior to film extrusion. Monolayer blown film was produced on a Killion blown film line equipped with a single screw extruder (D = 1.2 inches and L / D = 30, production rate 10 lb / hr) and a 3 inch diameter die with a 70 mil gap Made on. The melting temperature was 162°C. The blow up ratio was 2.5 and the film thickness was about 3 mils. Samples were cut from blown film for WVTR measurements. WVTR results are shown in Table III. WVTR is measured according to ASTM F1249-06 using a ...
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