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What is the name of a blue-veined Italian cheese originating in the Lombardy region and an American multinational communications company? In order to evaluate the compositional effect of different particles in thermoplastic matrixes, samples are made by the following method for evaluation of their appearance, transmission light efficiency, and surface texture effect.
The samples used in this example are made through a two step extrusion process: compounding the different particles with impact modified PMMA matrix to make a resin; and passing the resin through a sheet extruder to make 0. The temperature profiles used for resin compounding and sheet extrusion are listed in the following table:. Although the glass beads in EX III-C has a similar particle size range, it can not generate the desired surface texture and light transmission efficiency.
The following table shows the results of using the crosslinked spherical particles made by the method of Example 2C for other thermoplastic matrixes. The sample appearance, the surface roughness, and the total white light transmission are measured for different samples. The resins are then passed through a sheet extruder. The following conditions are used for sample preparation:. The sheet extrusion conditions for each of the samples are listed in the following table:.
The sample for the Surface Roughness Measurement is made by sheet extrusion at a 0. The mold temperature as listed in the following: PVC-1 at All of the samples give a frosted, non gloss appearance, and textured surface, and the samples maintain good physical properties. The PMMA-1 sample gives a better light efficiency and surface texture.
It is noted that the loading of the beads in polycarbonate should be lower in order to have better light transmission. All the samples have good hiding power, high light output and low object recognition. The beads were made as in Example 2C.
This experiment is designed to evaluate the concentration effect of the particles on the final products surface texture, total light transmission, appearance, hiding power, and mechanical impact properties. The appearance is evaluated visually. The total light transmission is a measurement of lighting efficiency.
The Melt Flow Rate, used broadly by the those skilled in the art, gives the process flow information for the sample. The Dynatup impact test is used for mechanical impact properties. The suspension beads are compounded into the rubber modified matrix material through a Killion extruder equipped with a two stage medium work screw at the following conditions:.
The resin is then injection molded into parts, as known to those skilled in the art, for the analysis of light transmission, mechanical properties, and extruded into sheet sample at 0. Total white Bead Total light Sample conc. The amount of crosslinking is 0. The beads were made as in Example 2B. Conclusion: Sample FST has the most textured surface and the best appearance among all the samples prepared.
The impact strength of this sample shows that the material maintains good impact properties. This example relates to the effect of bead concentration on hiding power. The samples tested are. The beads have a weight mean size: The samples are injection molded at a 0. Injection molded samples typically have a very smooth surface. The FST sample when extruded into a 0. The same sample material when injection molded has an opacity of For a sample at 0.
The suspension particles used for this experiment are made by the method described in Example 2B by varying the amount of allyl methacrylate in each sample. The particles have a weight mean particle size of 33 micrometers. The particles with different crosslinking levels are compounded into a rubber modified PMMA matrix through a Killion extruder and then passed through a sheet extruder to generate the samples for evaluation.
After multiple passes through the extruder, the particles with the lower level of crosslinking agent can not sustain their integrity and are deformed, which is a contributing factor for a non homogeneous surface texture of the sheet samples.
The better samples are generated from the particles having at least 0. The sample VI-D gives the best results among the samples tested. The proper crosslinking in the suspension particles appears to be critical to the final appearance of the product. The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The article of claim 1 , wherein the beads have a mean particle size of micrometers.
The article of claim 1 , wherein said polyester is polyethylene terephthalate glycol. The article of claim 1 , wherein the polymeric matrix is polymethyl methacrylate or copolymers of methyl methacrylate with from 0. The article of claim 1 wherein the crosslinking agent is ethylene glycol dimethacrylate, divinylbenzene or allyl methacrylate.
The article of claim 1 comprising a lighting, sign, point of purchase display, cosmetic display, container, home decoration, office decoration, furniture, shower door, or office door. The article of claim 1 wherein said article maintains the frosted appearance and textured surface though post-treatments.
The article of claim 7 , wherein said post-treatments comprise thermoforming and bending. USP true USB1 en. EPB1 en. JPB2 en. CNC en. ATT en. BRB1 en.
CAC en. DET2 en. DKT3 en. EST3 en. HKA1 en. PTE en. USB2 en. GBD0 en. Mar resistance, non-glare transparent acrylic sheet with consistent optical properties at various sheet thicknesses. Use of polyalkyl meth acrylate bead polymers and molding compound for the production of extruded molded parts with a matted surface.
USA1 en. Branched acrylic copolymer with high refractive index and preparation method thereof. Flame-retardant scratch-resistant thermoplastic resin composition with improved compatibility. Polycarbonate resin composition with improved transparency and scratch-resistance. Thermoplastic resin composition having improved impact strength and melt flow properties. Polycarbonate resin composition with excellent scratch resistance and impact strength.
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