Impact resins

Tires and treads for automobiles, trucks, and buses, 72% high-impact resin modification, 25% industrial products (conveyor belts, hoses, seals, and gaskets) and other applications, 3%... 

Three different kinds of behavior were observed on addition of the polyethers to PVC and CPVC. First, high-impact resins were sometimes produced without the addition of any other rubber (3, 4). Second, incompatible mixtures with poor properties were obtained. Third, certain polyethers, which in themselves did not lead to PVC s of high impact strengths, seemed to enhance the properties of an already modified CPVC (5). 

High-Impact Resins from Polytetrahydrofuran. The only polyether successfully used alone to produce high-impact resins was PTHF. (Brittle resins were obtained from all the other polyethers tried.) Both PVC (Figure 1) and CPVC (Figure 2) could be improved in Izod impact strength by addition of PTHF. As usual, high impact strength did... 

Lower-molecular-weight PTHFs did not lead to high impact resins, as shown by the results in Figure 3. However, if these PTHFs were first crosslinked (6), high-impact resins could be obtained. Some typical results are shown in Table III. 

A small child died when impacted resin obstructed the colon (SEDA-8, 935 8). 

On the other hand, some mechanically compatible blends as well as some dispersed two-phase systems have made respectable inroads into the commercial scene. Many of these are blends of low-impact resins with high-impact elastomeric polymers examples are polystyrene/rubber, poly (styrene-co-acrylonitrile) /rubber, poly (methyl methacrylate) /rubber, poly (ethylene propylene)/propylene rubber, and bis-A polycarbonate/ ABS as well as blends of polyvinyl chloride with ABS or PMMA or chlorinated polyethylene. 

MAJOR USES Manufacture of chemicals including acrylic fiber, plastics, rubber elastomers, plasticizers, solvents, polymeric materials, dyes, pharmaceuticals, insecticides and nylon formation of high impact resins such as styrene acrylonitrile and acrylonitrile butadiene styrene. 

ORIGIN/INDUSTRY SOURCES/USES production of acrylic and modacrylic fibers plastics rubber elastomers solvents polymeric minerals dyes pharmaceuticals insecticides nylon fumigant formation of high-impact resins... 

The substrates were rigid PVC, ABS impact resin and the GE polyblend Xenoy. All were commercial samples, and all were injection moulded to form 8.0 cm x 2.5 cm rectangles, 1.5 mm in thickness. 

Block polymers and polymer blends deserve now a great intere because of their multiphase character and their related properties. The thermodynamic immiscibility of the polymeric partners gives rise indeed to a phase separation, the extent of which controls the detailed morphology of the solid and ultimately its mechanical behavior. The advent of thermoplastic elastomers and high impact resins (HIPS or ABS type) illustrates the importance of the industrial developments that this type of materials can provide. In selective solvents, and depending on molecular structure, concentration and temperature, block polymers form micelles which influence the rheological behavior and control the morphology of the material. 

A potential area of application in which poly-PMS can give a significant Improvement In cost and performance Is flame retar-dance (FR) or Ignition resistance. PMS-based Impact resins require lower loadings of costly and heavy conventional FR additives to... 

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