Mar and scratch

Business or office appliances PCs and other computers, printers, photocopiers, shredders.. . Aesthetics Mar and scratch resistance Heat resistance Electrical insulation Durability Ease of cleaning Cost... 

Possessing both olefinic and non-olefinic characteristic, Hivalloy products are designed to combine the most desirable properties of PP, such as processability, chemical resistance and low density, with many of desirable features of engineoing resins which cannot be achieved with currently available polyolefins, such as improvements in the material s stiffiiess/impact balance, improved mar and scratch resistance, reduced molding cycle time and improved creep resistance. 

Uses Anticaking agent flow control agent, slip agenL mar and scratch additive in solvent and solventless systems incl. alkyds, epoxies, acrylics, PVC, two-component PU... 

The small amount of other additives include heat stabilizers, UV stabilizers, mold-release agents/lubricants, paint-adhesion promoters, mar and scratch-resistance improving additive, etc. 

Polypropylene 23 Automotive imder-the-hood furniture construction products recreational products Improved HDT Improved tensile strength Improved shrinkage control Improved mar and scratch Improved impact resistance... 

The following improvements are generally expected when incorporating wollastonite in plastics stiffness and flexural strength, impact resistance, dimensional stability, mar and scratch resistance, surface appearance, heat distortion temperature, electrical properties, and compatibility with a wide range of polymers. 

Lyondell BaseU Polymers sells compounded polyolefins. The base polyolefin is blended with impact modifiers, fillers and reinforcements, pigments, and additives. Customer applications include automotive components, electrical appliances, wire and cable, pipe and sheet, building and construction, and furniture. The properties of the product include a broad range of stiffness from very soft to very rigid, excellent aesthetic characteristics and colorability, good processability, high stiffness/ impact balance, high mar and scratch resistance, low carbon emissions achievable, and excellent recyclability. 

Linear polyether siloxanes with ABA structure have demonstrated their superior ability to reduce the coefficient of friction of coatings and improve the mar and scratch resistance [59]. A chain of 20-60 dimethysiloxane units ensures the formation of a silicone oil like film on the surface even at a dosage level of 0.1%, whereas the polyether end groups guarantee a sufficient compatibility with the coating system. Slip properties of the polyether siloxane films for practical applications are even better than with pure silicone oil films, which tear under relatively low pressure due to their low intermolecular forces. The friction of coating surfaces can be reduced by a factor of 10 by the addition of only 0.1% of silicone polyethers. 

Polyethylene waxes have several useful characteristics in their application to paints, such as low toxicity, antiblocking properties combined with slip properties, and improved mar and scratch resistance (see Figure 10.4). ° ... 

Solutions of PVC/ VA polymers can be blended with most acrylic resins to provide useful coatings, but with few other polymers. Carboxylated and epoxy-functional grades can be combined to provide heat-crosslinkable blends, at the expense of limited shelf stability. Hydroxyl-modihed grades have broader compatibility and may be blended with alkyd, urea, melamine, and epoxy resins, and with urethane pre-polymers. Such blends can be heat-crosshnked, resulting in tough, chemical-resistant hlms. Urethane blends are characterized by high mar and scratch resistance. 

One of the most important characteristics of a thermosetting coating to achieve good mar-and-scratch resistance is the crosslink density of the coating (11,12). Crosslink density is a function of the amount of functionality and the degree of reaction of that functionality. The preceding cost chart shows that the functional... 

Taber Industries Linear Abraser can also emulate the physical contact made with various scratch media. The Multi-Mar Attachment allows you to conduct similar tests as the balance beam tester using mar and scratch tools such as a paperclip, loop stylus, needle stylus, Hoffman type stylus and coin. For soft materials, a 1.0mm diameter hemisphere Scratch Tip is suggested. For harder materials, a conical tool such as the Diamond Scratch Kit or Tungsten Carbide Scratch Tips may be used. 

In the literature, there has been some work done to characterize the mar behavior of polymers. Shen et al. attempt to define a mar as light damage occurring at low loads [6-8]. Although this may be the general case, their definition gives neither a reference to precedence nor any relation to material properties that set mar and scratch apart as separate entities. 

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