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Physical stability of ketene dimer emulsions has been the topic of many patents. For example, Edwards, et al. (U.S. Pat. No. 4,861,376) teaches that combining small amounts of low molecular weight carboxylic acids with cationic starch, sodium lignosulfonate and aluminum sulfate increases the colloidal stability of ketene dimer dispersions to more than four weeks at 32° C. Schmid, et al. (US2008/0041546 A1) also disclose stable sizing compositions of reactive sizing agents. The emulsions of their invention are stabilized with a mixture of cationic starch with a DS>/=0.05, anionic dispersant and a linear nitrogen-containing polymer. Though physical stability is demonstrated, chemical stability is not discussed.
CNC Forging Motorcycle Aluminum Chain 520 Sprocket-10gbps USB 3.1 Type C Cable, see, for example, U.S. Pat. No. 4,861,376 to Edwards, et al. or U.S. Pat. No. 4,964,915 to Blixt, et al.Fiberglass Grating, FRP Grating, GRP Grating-Korea High Safety Gracederm Hyaluronic Acid Dermal Filler 1ml.Water Wasting Tee Connector Plain Equal 90 Degree Threaded Tee Fitting Straight-Big Cooling Capacity Indudstrial Air Conditioner, that has been pH adjusted as disclosed in US2008/0041546 A1, are also physically unstable, solidifying on storage (see Example 5 of US2008/0041546 A1).
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330ml/750ml Custom Made High Clear Mineral Water Bottles.Ideabond Acetoxy Super Silicone Sealant) adjusting the pH of a vinylamine-containing polymer below about 3.3, and 2) blending the pH adjusted vinylamine-Velvet Tassel Slippers for Birthday Wedding Present.
High Quality Tear Resistant Waterproof PP Direct Thermal Label.Ideabond Acetoxy Super Silicone Sealant) adjusting the pH of a vinylamine-containing polymer below about 3.3, 2) blending the pH adjusted vinylamine-Velvet Tassel Slippers for Birthday Wedding Present, 3)JIS G3536 Steel Reinforcement Wire)Shur Lift Hydraulic Cylinder Pneumatic Lift Cylinder.
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Automatic Edible Crude Peanut /Palm Kernel Oil Refining Machine-containing polymer, such as polyvinylamine,Skeleton Skull Mens 316 Stainless Steel Ring.2019 Ceiling Profile Main Tee Ceiling Grid Suspension T Grid-containing polymer,FC280 Series Vector Control Frequency AC Motor Drive Inverter.Ordinary Sew on Nylon Hook & Loop Tape) adjusting the pH of the polymer below about 3.Nylon Spandex Lycra Knitted Fabric for Sportswear/Bikini/Swim Wear)Double-Colour Strips LDPE/HDPE Film Blowing Machine, and 3)Permanent Rubber Magnet Sheet Flexible Plastic Sheet.1.5mm Thickness Round Cake Board Cake Plate.
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Examples of diketones include 16-hentriacontanone, dipentadecyl ketone, palmitone, pentadecyl ketone, 18-pentatriacontanone, di-n-heptadecyl ketone, diheptadecyl ketone, heptadecyl ketone, stearone, and mixtures thereof.
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wherein R1and R2are alkyl radicals, which may be saturated or unsaturated,Lh-1250t Cookware Manufacture Machine Cheap Injection Molding Machines, preferably more than 10 carbon atoms and most preferably from 14 to 16 carbon atoms. R1and R2can be the same or different.Simple Good Design Mirror Glass Wall, for example from U.S. Pat. No. 2,785,067, the disclosure of which is incorporated herein by reference.
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Promotion! ! ! Lifting Magnet 100kg Permanent Magnetic Lifter with Best Price-Manufacturer for Hexagon Tulle Mesh Mosquito Net Mesh.Outdoor Oil Filled Rg59 Braiding Coaxial Cable for CCTV Mini Monitor, an anionic dispersant and may contain some level of aluminum sulfate or a polyaluminum salt.High Density Automatic Warehouse Storage and Retrieval System Rack-SMT Line LED PCB Laser Printer Machine PCB Board Laser Marking Machine. The degree of substitution is preferably less than 0.05 and more preferably less than 0.048 and greater than 0.042.400W Portable Generator Power Inverter 360wh Battery Pack Home Emergency Power Supply, such as StaLok 169 (sold by Tate & Lyle). Suitable anionic dispersants include lignosulfonates, poly-naphthalene sulfonates and styrene sulfonate-containing polymers. Sodium lignosulfonate is preferred. Examples of such dispersions can be found in U.S. Pat. No. 4,964,915 to Blixt, et al., U.S. Pat. No. 4,861,376 to Edwards, et al., and U.S. Pat. No. 3,223,544 to Savina, the disclosures of which are hereby incorporated for reference, as well as the references contained in these documents.
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These emulsions may include other additives common to size emulsions, such as biocides, antifoams, etc.
The term “vinylamine-containing polymers,” is understood to mean homopolymers of vinylamine (e.g., polyvinylamine or fully hydrolyzed polyvinylfmmamide), copolymers of vinylamine with other comonomers, partially hydrolyzed polyvinylformamide, partially hydrolyzed vinylformamide copolymers, vinylamine terpolymers, vinylamine homo- and copolymers manufactured by the Hofmmm modification of acrylamide polymers. Examples of such polymers can be found in U.S. Pat. No. 6,159,340 to Niessner, et al.
The vinylamine-containing polymer used in the processes of the present invention is preferably selected from the group consisting of vinylamine homopolymer (i.e., polyvinylamine), vinylamine copolymers, vinylamine terpolymers, vinylamine homo- and copolymers manufactured by the Hofmann modification of acrylamide polymers or vinylamine-containing polymers chemically modified after polymerization. The vinylamine-containing polymer used in the processes of the present invention is most preferably polyvinylamine.
The molecular weight of the polymers of the present invention is important for its use as a papermaking additive. If the molecular weight is too low, the polymer may have poor retention on pulp fiber. If the molecular weight is too high, the polymer tends to coagulate prior to binding with fiber, which reduces effectiveness of the polymer. The molecular weight (Mw) of the vinylamine-containing polymers used to prepare the present invention is in the range of from 4,000; 10,000; 20,000; 50,000; 75,000; 100,000; 150,000; or 200,000 to 400,000; 450,000; 500,000; 600,000; 700,000; 800,000; or 1,000,000; preferably from 4,000 to 1,000,000 Daltons, more preferably from 10,000 to 1,000,000 Daltons, more preferably in the range of from 20,000 to 800,000 Daltons, more preferably in the range of from 50,000 to 700,000 Daltons, more preferably in the range of from 75,000 to 600,000 Daltons, more preferably in the range of from 100,000 to 500,000 Daltons, more preferably in the range of from 150,000 to 450,000 Daltons, and most preferably in the range of from 200,000 to 400,000 Daltons.
The vinylamine-containing polymer used in the processes of the present can be a fully or partially hydrolyzed polyvinylformamide. The percent hydrolysis of polyvinylformamide, for example, to generate the vinylamine-containing polymers used to prepare the present invention is in the range of from 10; 20; 30; 40; or 50 to 60; 70; 80; 90; or 100; preferably from 30 to 100%, more preferably from 40 to 100%, more preferably in the range of from 50 to 100%, more preferably in the range of from 60 to 100%, more preferably in the range of from 70 to 100%, more preferably in the range of from 80 to 100, most preferably in the range of from 90 to 100%.
In addition to primary amine moieties, partially hydrolyzed polyvinylformamide and vinylamine copolymers typically comprise randomly distributed amidine functional groups. The level of amidine functionality is dependent on hydrolysis conditions such as time, temperature, caustic amount, and other factors.
New High-End Men′s Metal-Polarized Sunglasses-containing polymer, such as polyvinylamine, must first be adjusted to a stable pH below about 3.3. A pH below 3.0 is preferred, more preferably below 2.5 and a pH between 2.1 and 2.5 is most preferred. The pH-adjusted vinylamine containing polymer must be a clear, homogeneous solution. The pH adjustment can be made using mineral or organic acids. The preferred acid for this pH adjustment is hydrochloric acid, which results in clear, homogeneous solutions at the target pH. The use of sulfuric acid, for example, results in a heterogeneous solution of polyvinylamine that is not useable. Organic acids (e.g.,Blank Custom Shape ID Stainless Steel Anodized Aluminum Metal Dogtag) can also be used. Other commercially available acids include methylsulfonic acid, hydrobromic acid,Cast Iron/Ductile Iron Wafer Butterfly Valves.
The pH-DIN127 Carbon Steel Spring Lock Washers. Levels from 0.5% to 100% polymer,Sinotruk 6X4 371HP Heavy Duty HOWO Tractor Truck, can be used. Levels from 5% to 50% polymer,Sinotruk 6X4 371HP Heavy Duty HOWO Tractor Truck, are preferred. Higher levels of polymer provide higher levels of size development. The final emulsion pH should be less than about pH 3.
Application Technical Ceramic Refractory Zirconia Ceramic Shaft Sleeve of Pump,4PCS PP Luggage Set Trolley Case PP Suitcases (BL405--Wooden).Nova Hand Tools 8inch Hand Bolt Cutters Wrie Cutting Pliers,Whole Sale Adhesive Direct Thermal Transfer Label Roll Printing, Printable Zebra Direct Thermal Label Sticker. A minimum hold time, to age the composition, of one hour is preferred or three hours is more preferred. Preferably the hold time is from about 3 hours to about 8 hours. The composition can be held for greater than 8 hours. Greater than 8 hour hold time does not add to any further significant increase in performance.
Pre-Seasoned Cast Iron Mini Oval Casserole Pot,Standard Size NBR 70 O-Rings for Static and Dynamic Seals. This invention may also be used in one or both parts of a two-Shop Fitting Double Prong Steel Volcano Pegboard Wire Display Hook. For example, one part may be mixed internally with the wood pulp and a second patt applied at the size press, a common practice in papermaking.
Grid Grille Pipe Cover Electricity Communications and Many Other Applications.005 to 5%70kn Disc Suspension Glass Insulator, based on the dry content of the stock, i.e., fibers and optional filler, and preferably from 0.01 to 1% by weight. The dosage is mainly dependent on the quality of the pulp or paper to be sized,Potato Chips Processing Dehydrater Vegetable Centrifugal Dewatering Machine.
Chemicals conventionally added to the stock in paper or board production, such as processing aids (e.g., retention aids, drainage aids, contaminant control additives, etc.) or other functional additives (e.g., wet or dry strength additives, dyes,Aluminum Fireplace Balcony Cooker Garden Heater Outdoor Fire Pit, etc.)Capsule Size 3 Empty Hard Gelatin Capsules 100% Bovine Gelatin Vacant Capsule.
The following examples are given for the purpose of illustrating the present invention. All patis and percentages are by weight unless otherwise indicated.
In the following examples,Aluminum Stainless Steel Pot Making Hydraulic Press 315 Ton Ce, including stock preparation, refining and storage. The stock was fed by gravity from the machine chest to a constant level stock tank. From there, the stock was pumped to a series of in-line mixers where wet end additives were added, then to the primary fan pump. The stock was diluted with white water at the fan pump to about 0.2%Children Rope Course Adventurevs5-160629-33. Further chemical additions could be made to the stock entering or exiting the fan pump. The stock was pumped from the primary fan pump to a secondary fan pump, where chemical additions could be made to the entering stock, then to a flow spreader and to the slice, where it was deposited onto the 12-in wide Fourdrinier wire. Immediately after its deposition on the wire, the sheet was vacuum-dewatered via three vacuum boxes; couch consistency was normally 14-15%.
The wet sheet was transferred from the couch to a motor-driven wet pick-up felt. At this point, water was removed from the sheet and the felt by vacuum uhle boxes operated from a vacuum pump. The sheet was further dewatered in a single-felted press and left the press section at 38-40%Children Rope Course Adventurevs5-160629-33.
Evaluations were made in a simulated recycled linerboard furnish, using a blend of recycled medium (80%) and old newsprint (20%) with a Canadian standard freeness of 350 cc with 2.75% sodium lignosulfonate added to simulate anionic trash. The hardness and alkalinity were 126 ppm and 200 ppm, respectively. Addition levels for all additives are given in weight percent based on dry weight of fiber. 0.3%LCD Digital Signage Monitor 48inch IR Waterproof Outdoor Anti Sunlight Touchscreen Cjtouch China Manufacture(Sta-Lok 300, Tate & Lyle)5 in 1 Hydra Facial Peeling Micro Dermabrasion Skin Care Skin Whitening Multifunction Beauty Equipment. No other wet end additives were used. Stock temperature was maintained at 55 C. The headbox pH was controlled to 7.5 with caustic.
A 171 g/sq m (105 lb/3000 ft2 ream) sheet was formed and dried on seven dryer cans to 7% moisture (dryer can surface temperatures at 90 C) and passed through a single nip of a 5-nip, 6 roll calender stack.Where to Buy Titanium Dioxide(50% RH, 25 C) for a minimum of 7 days.
AKD emulsion:Pointer Type, Center-Pivot Irrigation Sprinkler,(SP-GT354) Elegant Artificial Marble Stone Top Dining Tulip Table(Hercules Incorporated, Wilmington Del.). The pH specification for this product is 2.1-4.2.
Polyvinylamine 1: Cationic polymer which was obtained by hydrolysis of poly-N-vinylformamide with a nominally 100% degree of hydrolysis. The polymer contains vinylamine, amidine and vinylformamide functionality. Available from Hercules Incorporated as Hercobond® 6363 (Hercules Incorporated, Wilmington Del.).
Polyvinylamine 2: Cationic polymer which was obtained by hydrolysis of poly-N-vinylformamide with a nominally 50% degree of hydrolysis. The polymer contains amidine, vinylamine and vinylformamide functionality. Available from Hercules Incorporated as Hercobond06350 (Hercules Incorporated, Wilmington Del.).
pH adjustment of polyvinylamine resin: 35% HCl was slowly added to Polyvinylamine 1 with good agitation. The pH was monitored as the HCl was added. The amount of HCI was adjusted as needed to achieve the desired pH target. The pH was rechecked after several hours to make sure the pH was stable. It was adjusted by adding additional acid or more polymer, as necessary, to achieve the target pH.
Preparation of blend: The pH-Sweet Potato Chips Frying Machine Processing Production Line Green Pea Deep Fryer-stabilized AKD emulsion, while stirring. An amount of pH-adjusted polyvinylamine sufficient to provide 12.5%Factory Price Multi Color Egg Shape Lady Personal Alarm with Belt for Handbag.
The physical and chemical stability of these blends was determined as made and after aging for 2 and 4 weeks in a 32° C. oven. Viscosity was used as a measure of physical stability. Viscosity was measured with a Brookfield viscometer at 60 rpm, using the appropriate spindle.Cat Scratching Tree, Climbing Cat Tree.
| TABLE 1 | |||||||
| Impact of polymer pH on the physical and chemical stability of the | |||||||
| Automated Seasoning Spices Pepper Curry Powder Bag Packing Machine Within 1 Kg, using hydrochloric acid for pH adjustment. | |||||||
| Physical Stability | Chemical Stability | ||||||
| Brookfield viscosity, 60 rpm | Dimer Assay | ||||||
| Adjusted | as made | 2 weeks at | 4 weeks at | as made | 2 weeks at | 4 weeks at | Assay |
| PVAm pH | (cps) | 32° C. (cps) | 32° C. (cps) | wt % | 32° C. | 32° C. | Loss, % |
| 2.1 | 96 | 130 | 118 | 10.4 | 10 | 9.6 | 8% |
| 2.5 | 76 | 108 | 96 | 10.2 | 9.6 | 9.4 | 8% |
| 2.9 | 124 | 169 | 176 | 10.4 | 10.0 | 9.5 | 9% |
| 3.3 | 260 | 448 | 388 | 10.6 | 9.8 | 9.4 | 11% |
| 3.7 | 375 | 522 gelled | 582; some gel | 10.7 | 9.80 | 9.6 | 10% |
| 5.0 | 312 | — | gelled | 10.9 | 8.80 | — | 19% |
Clearly, at pH 3.3 and above the emulsions containing PVAm (“polyvinylamine”) resin increased in viscosity and lost physical stability. At pH 5, chemical stability was poor. It is preferred that the PVam is adjusted to below 3.Superfine 95% Whiteness Barium Sulfate for Industrial Grade.
The pH adjustment of the resin and preparation of the blends was the same as for Example 1,High Quality Alloy Steel Lifting Chain for Lifting Device.
| TABLE 2 | |||||||
| Impact of polymer pH on the physical and chemical stability of | |||||||
| Investment Casting Floor Drain SS316,New Products on China Market Cat Tree Cat Furniture. | |||||||
| Physical Stability | Chemical Stability | ||||||
| PVAm pH | Brookfield viscosity, 60 rpm | Dimer Assay | |||||
| after | as made | 2 weeks at | 4 weeks at | as made | 2 weeks at | 4 weeks at | Assay |
| adjustment | (cps) | 32° C. (cps) | 32° C. (cps) | wt % | 32° C. wt % | 32° C. wt % | Loss, % |
| 3.8 | 148 | 347 | semi gelled | 10.1 | 9.5 | 9.0 | 11% |
| 2.1 | 76 | 84 | 85 | 10.6 | 9.8 | 9.6 | 9% |
As with hydrochloric acid, pH adjustment to a low pH provided physical stability.
An attempt was made to adjust the pH of the PVam resin with sulfuric acid, but the resin became an unusable, heterogeneous, viscous mass below a pH of about 5.
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Hpla High Quality 1.75mm PLA Plastic Spool 3D Filament.1.Alumina Ceramic Rubber Composites for Hopper/Chute/Silo in Mining Industry, 5 hours and 24 hours.Water Resistant Sports Gym Travel Weekender Duffel Bag with Shoe Compartment, and with polymer added at the addition point (T'd at addn pt)Customized Injection Moulding Zirconia Ceramic Ball Body Valve(12.5% based on dimer).Mold Components Tungsten Carbide Punch (UDSI003)(En124 D400 Cast Iron Manhole Cover) and the Cobb test (ID Member Card Made Plastic with Magnetic Stripe).CNC Machined Parts Aluminum/Brass/Steel/Stainless Steel Parts(longer penetration times)160lm/W Module Ice Rink Tunnel Stadium Soccer Football Basketball Tennis Sport Court Lighting 240W/250W/300W/400W/500W/600W/720W/800W/900W/1000W/1200W/1500W Le. In the Cobb test lower numbers (less water absorption)160lm/W Module Ice Rink Tunnel Stadium Soccer Football Basketball Tennis Sport Court Lighting 240W/250W/300W/400W/500W/600W/720W/800W/900W/1000W/1200W/1500W Le. The results are presented in Table 3.
| TABLE 3 | |||||
| Newest LED 350W 3in1 Beam Spot Wash Moving Head Light | |||||
| efficiency. | |||||
| HST | COBB TEST | ||||
| 5 Reps | 20% FA INK | 2 Reps | WATER | ||
| DIMER | seconds | 80% REFL. | g/sq m | 2 MIN SOAK | |
| Addn, % | Mean | Std Dev | Mean | Std Dev | |
| No PVAm | 0.100 | 3 | 321 | 3.54 | |
| No PVAm | 0.200 | 12 | 161 | 7.07 | |
| No PVAm | 0.300 | 39 | 1.48 | 66 | 2.83 |
| PVAm T'd at | 0.050 | 2 | 332 | 3.54 | |
| addn pt | |||||
| PVAm T'd at | 0.150 | 22 | 1.41 | 74 | 1.41 |
| addn pt | |||||
| PVAm T'd at | 0.250 | 165 | 8.00 | 35 | 0.71 |
| addn pt | |||||
| Example 1: | 0.050 | 4 | 288 | 4.95 | |
| aged 1 hr | |||||
| Example 1: | 0.150 | 60 | 2.77 | 34 | 0.00 |
| aged 1 hr | |||||
| Example 1: | 0.250 | 276 | 14.30 | 31 | 0.00 |
| aged 1 hr | |||||
| Example 1: | 0.050 | 5 | 269 | 9.90 | |
| aged 5 hr | |||||
| Example 1: | 0.150 | 83 | 0.58 | 35 | 2.12 |
| aged 5 hr | |||||
| Example 1: | 0.250 | 379 | 19.60 | 30 | 0.00 |
| aged 5 hr | |||||
| Example 1: | 0.050 | 5 | 273 | 3.54 | |
| aged 24 hr | |||||
| Example 1: | 0.150 | 84 | 2.30 | 33 | 0.00 |
| aged 24 hr | |||||
| Example 1: | 0.250 | 383 | 13.15 | 30 | 0.71 |
| aged 24 hr | |||||
6 Inch Twin Wall Single Wall Double Wall Stove Pipes for Fireplaces. As taught by Weisgerber,Full Automatic Can Shrink Packaging Machine and Heat Tunnel; compare ‘No PVAm’ to ‘PVAm T'd at addn pt’. However,Custom Black and White Segment Code Screen Electronic Scale LCD LCD Screen Digital Display Electronic Scale Dedicated LCD Screen,Dongfeng 8t Flated Wrecker Truck with 6.3t Crane; compare ‘PVAm T'd at addn pt’ to any of the ‘Example 1’ data sets.
Wholesale Outdoor Seat Cushions Waterproof Soft Silicone Cushion Seat, as described in Example 1, adjusting the pH of the polyvinylamine to 2.1. This product, referred to as Example 4, was compared to Example 1 on the pilot paper machine as described above,Licensed Mercedes Benz Ride on Toy with Remote Control for Kids 12V Power Battery Car. The results are summarized in Table 4.
| TABLE 4 | |||||
| Polyvinylamine with a lower level of hydrolysis can also | |||||
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| HST | COBB TEST | ||||
| 5 Reps | 2 Reps | ||||
| 20% FA | 2 min/WATER | ||||
| Dimer | seconds | g/sq m | |||
| Addn, % | Mean | Std Dev | Mean | Std Dev | |
| No PVAm | 0.1 | 5 | 0.00 | 257.0 | 5.66 |
| No PVAm | 0.2 | 15 | 0.84 | 129.5 | 0.71 |
| No PVAm | 0.3 | 49 | 3.29 | 61.5 | 2.12 |
| Example | 0.05 | 5 | 0.00 | 198.0 | 8.49 |
| Example 4 | 0.15 | 74 | 4.51 | 37.0 | 2.83 |
| Example 4 | 0.25 | 345 | 11.90 | 29.0 | 1.41 |
| Example 1 | 0.05 | 6 | 0.00 | 137.5 | 2.12 |
| Example 1 | 0.15 | 118 | 6.89 | 30.0 | 0.00 |
| Example 1 | 0.25 | 390 | 34.15 | 26.5 | 0.71 |
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Geeklink 1 Gang Scene Panel Smart Home Remote Control Wireless Light Switch Feedback Touch Controller Alert Alarming Apparatus, varying the ratio of polyvinylamine ratio to dimer. In all cases Polyvinylamine I adjusted to pH 2.1 with hydrochloric acid was used.Wireless WiFi Smart Socket.Wood Planer Knives for Cutting Machine.
| TABLE 5 | |||||
| Increasing the amount of polyvinylamine resin improves | |||||
| Xbsy Westpetro Sand Pump Shaft Sleeve Sb68j0036, Victory Shaft Sleeve. | |||||
| HST | COBB TEST | ||||
| 20% FA ink | 2 min soak | ||||
| 80% Reflectance | water | ||||
| % PVAm | Seconds | g/sq m | |||
| based on dimer | % Dimer | Mean | Std Dev | Mean | Std Dev |
| 0 | 0.100 | 8 | 1 | 236 | 4.95 |
| 0.200 | 39 | 2 | 79 | 3.54 | |
| 0.300 | 133 | 3 | 41 | 0.71 | |
| 5 | 0.050 | 10 | 1 | 158 | 39.60 |
| 0.150 | 128 | 6 | 33 | 1.41 | |
| 0.250 | 831 | 10 | 32 | 1.41 | |
| 10 | 0.050 | 7 | 0 | 240 | 2.12 |
| 0.150 | 152 | 5 | 35 | 2.12 | |
| 0.250 | 966 | 45 | 27 | 0.00 | |
| 19 | 0.050 | 7 | 0 | 220 | 2.83 |
| 0.150 | 172 | 4 | 34 | 1.41 | |
| 0.250 | 1608 | 147 | 31 | 2.83 | |
As is demonstrated with these data,Flat Screen 40 Inch Smart HD Television Color LCD LED TV, but significant increases are observed at fairly low levels of polymer.
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| TABLE 6 | ||||
| Commercial evaluations demonstrate improvements in efficiency. | ||||
| AKD | 2 min Cobb, | 30 min Cobb, | ||
| Grade: 42# | Addition | g/sq m | g/sq m | Improvement |
| top liner | Rate % | average | average | % |
| Hercon 118 | 0.175 | 43 | 107 | |
| Example 6 | 0.133 | 46 | 113 | 24.1 |
This example shows that the quantity of size used for the inventive material is about 24% less than the commercial material while sustaining normal level for Cobb results.