Acrylic modified

A bond coat of a polymer latex (also called polymer emulsions or dispersions) such as styrene butadiene (SBR), polyvinyl acetate (PVA) acrylics or modified acrylics. These are applied to the prepared concrete as... 

Lenses for safety glasses are made from highly impact resistant plastics such as modified acrylics and polycarbonate. They will resist puncture from flying objects and offer the exceptional eye protection. They can be molded to prescription requirements. 

Acrylic and modified acrylic Cellulosics acetate Butyrate Propionate... 

This reaction includes modified acrylates with or without addition of styrenes in combination with one or more initiators in a solvent [126], In an example, tetrahydrofuran was used as solvent and the polymer concentrations amounted to about 5.6 g Thus, the polymerization is carried out as solvent process. 

The name is used also by ICI as an acronym for a range of modified acrylic resins. 

Data concerning the xenon arc exposure of PECT have been reported [2], Note that comparison is made to general purpose polycarbonate and impact modified acrylic for the color development. The PECT copolymer obviously changes much more rapidly in b value [3] than either of these materials. Flatwise impact testing (see below) showed the PECT sample to be ductile at the test start and brittle at the first exposure interval of 800kJ/m2 exposure. 

We note also for comparison that impact-modified acrylic polymer sheeting has a very low, but non-zero color increase upon outdoor exposure (see Figure 18.6)... 

Polyurethane-acrylic coatings with interpenetrating polymer networks (IPNs) were synthesized from a two-component polyurethane (PU) and an unsaturated urethane-modified acrylic copolymer. The two-component PU was prepared from hydroxyethylacrylate-butylmethacrylate copolymer with or without reacting with c-caprolactonc and cured with an aliphatic polyisocyanate. The unsaturated acrylic copolymer was made from the same hydroxy-functional acrylic copolymer modified with isocyanatoethyl methacrylate. IPNs were prepared simultaneously from the two-polymer systems at various ratios. The IPNs were characterized by their mechanical properties and glass transition temperatures. 

Synthesis of Urethane Modified Acrylics and Acrylic Modified Urethanes. 1) Synthesis of PBH. Into a reaction kettle equipped with a nitrogen inlet, stirrer, reflux condenser, and an addition funnel charged 500g of xylene. The xylene was heated to reflux and a mixture of 375g butyImethacrylate (BMA), 125g of 2-... 

There are impact modified acrylic-based polymer compositions intended for molding and extrusion of medical applications sold under the tradename Cyrolite (15). 

A third type of security glass is installed in modem penal institutions. This product is utilized for prisoner detention and obviates iron bars and their demeaning aspect. Typical construction utilizes three or more layers with at least one ply of thick PVB. Other constructions utilize polycarbonates, polyurethanes, and modified acrylics. Strengthened glass and electrically conductive circuits for alarms may be included. Large, heavy sections of similar construction have been used for underwater windows for boats, submarines, and aquariums. Four plies of fully tempered, 10-mm glass plus three plies of PVB totaling 44.5 mm in thickness has a modulus of rupture of 172 MPa (25,000 psi) (39). 

Acid Dyes. These water-soluble anionic dyes are applied to nylon, wool, silk, and modified acrylics. They are also used to some extent for paper, leather, ink-jet printing, food, and cosmetics. 

Azo dyes with relatively low molecular masses and one to three sulfonic acid groups serve as acid azo dyes for dyeing and printing wool, polyamide, silk, and basic-modified acrylics and for dyeing leather, fur, paper, and food. The main area of application is the dyeing of wool and polyamide. 

Indirect food additive acrylic Use only as a flow and modified acrylic plastics, promoter at a level semirigid and rigid not to exceed... 

FDA. 1999c. U.S. Food and Dmg Administration. Code of Federal Regulations. 21 CFR 177.1010 Aciylic and modified acrylic plastics, semirigid and rigid. 

Back-coating is the major area where bromine-based flame-retardant compounds are used for textiles. This technique is applied primarily in applications such as upholstery and wall coverings. The system would comprise an FR additive with a latex binder, the latter often based on acrylic or ethylene vinylacetate. Use of vinylidene chloride-modified acrylics reduce the amount of tire-retardant additive required. 

The use of FRP is desired to replace older materials of construction such as concrete, stucco, etc. They have been used in many historical preservation projects. The reason they are desired is because of light weight, durability ease of installation, and low maintenance (no dry rot, attack by insects, mold, etc.). These are typically nonstructural parts made by spray-up process or continuous panel process. An example are shown in Figure 23.11. This market is expected to continue to grow. The main resin used for exterior architectural applications are halogenated polyester resins. Since there is not a smoke requirement, resins that meet the ASTM E-84 flame spread requirement of <25 can be used for this application. The other common material used for these applications is polyester resin or modified acrylic resins that are filled with ATH. The ATH filled resins can also be used in interior applications since they will typically also have low smoke values. 

Manfredi, L. B., Rodriguez, E. S., Wladyka-Przybylak, M., and Vazquez, A. Thermal degradation and fire resistance of unsaturated polyester, modified acrylic resins and their composites with natural fibres, Polym. Degrad. Stabil. 2006, 91, 255-261. 

An epoxy-modified acrylic resin in n-butanol and xylol, sometimes with the addition of 2-ethoxyethanol. 

Most crosslinked thermosetting adhesives such as epoxies, phenolics, polyurethanes, and modified acrylics are highly resistant to many chemicals, at least at temperatures below their glass transition temperature. 

Textiles Acid dyes are characterized by the presence of one or more water soluble anionic groups which is typically a sulphonic acid. These dyes are applied to nitrogenous materials such as wool, silk, nylon or modified acrylics. They are not fast to cotton. 

Polyurethane Acrolon218HS Sherwin- Williams, Polyester modified acrylic polyurethane... 

Sultam-modified acrylates undergo [4 + 2]-cy-cloadditions with 1,3-dienes with excellent endo- and side-selectivity in the presence of EtAlCl2 or TiCl4 [7-9]. This feature could be used for an effective synthesis of the loganin-aglycon 9 (Scheme 2) [10] ... 

Analysis of these effects is difficult and time consuming. Much recent work has utilized two-dimensional, finite-difference computer codes which require as input extensive material properties, e.g., yield and failure criteria, and constitutive laws. These codes solve the equations of motion for boundary conditions corresponding to given impact geometry and velocities. They have been widely and successfully used to predict the response of metals to high rate impact (2), but extension of this technique to polymeric materials has not been totally successful, partly because of the necessity to incorporate rate effects into the material properties. In this work we examined the strain rate and temperature sensitivity of the yield and fracture behavior of a series of rubber-modified acrylic materials. These materials have commercial and military importance for impact protection since as much as a twofold improvement in high rate impact resistance can be achieved with the proper rubber content. The objective of the study was to develop rate-sensitive yield and failure criteria in a form which could be incorporated into the computer codes. Other material properties (such as the influence of a hydrostatic pressure component on yield and failure and the relaxation spectra necessary to define viscoelastic wave propagation) are necssary before the material description is complete, but these areas will be left for later papers. 

Figure 1. Transmission electron micrograph (22,050X) of American Cyanamid rubber-modified acrylic with 16% butadiene rubber...

Figure 6a. Stress-strain curves for various rubber-modified acrylics at 0.2 inch/min and 23°C...

The primary mode of bonding for a pressure-sensitive adhesive is not chemical or mechanical but rather a polar attraction to the substrate. This always requires pressure to achieve sufficient wet-out onto the surface thereby providing adequate adhesion. The four main varieties of pressure-sensitive adhesives are derived from rubber-based, acrylic, modified acrylic and silicone formulations. Release liners are used to carry the sticky label and enable it to be printed. The release liners are normally paper, treated with a very thin silicone coating to allow the label to be peeled away easily without tearing. Some transfer of the silicone into the adhesive is inevitable. 

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