Лако-красочные материалы — производство

The major use for block copolymers is in hot melt and solvent-based pressure sensitive adhesives. These pressure sensitive adhesives are most often used for tapes, and to a lesser degree, for labels. Solids contents of the solvent-based pressure sensitive adhesives are typically in the 40-60% range and are applied by a variety of converting processes, […]

The differences between emulsion and solution polymerized SBRs are significant, although they do share the following similarities. Superior water and moisture resistance While not recommended for immersion applications, and not as resistant as butyl compounds, these polymers are not affected by most aqueous chemicals. Ease of dispersion Both emulsion and solution grade polymers are easily […]

Buna S (as it was first known) was developed in the late 1930s in Germany as a synthetic natural rubber. When the United States needed a synthetic polymer as a replacement for natural rubber as part of the war effort in the early 1940s, chemists at several rubber companies were familiar with that technology and […]

General purpose solvent-based nitrile adhesives are frequently used when resistance to oils and plasticizers is required. Gaskets made from cork, rubber, metal, fiber, and composite blends are often bonded in place with nitrile adhesive. Bonding highly plasticized PVC films to other surfaces and to themselves often requires the superior plasticizer resistance of nitriles, although staining […]

First made commercially available in Germany in 1936, this elastomer is officially known as acrylonitrile butadiene, and is usually the product of an emulsion polymer­ization process that combines the two monomers: acrylonitrile and butadiene. However, the polymer can also be made in a solution process, and with a variety of monomers. As a specialty polymer, […]

Building on technologies first developed in Germany in the early 1930s, Robert M. Thomas and William J. Sparks, both employees of Standard Oil (now ExxonMobil Chemical), patented a new synthetic rubber in 1937. Butyl rubber is characterized by a very saturated linear polymer chain, leaving little space between molecules for transmis­sion of air, vapors, moisture, […]

While there are significant differences between grades of polychloroprene elastomers due to molecular weight differences and crystallinity characteristics, by and large, processing and performance properties may include: Superior green strength Applying a thin coat of either water-based or solvent-based adhesive onto each of the substrates to be bonded, drying to a tacky-to-the- touch condition, and […]

At one time, this polymer was one of the most commonly used adhesive types made from a rubber, taking over from natural rubber in the 1950s and 1960s. The primary reason for this high usage was a direct result of the rubber’s chemical nature. Structurally, polychlor — oprene is similar to natural rubber, and in […]

Many polymers exhibit some of the characteristics of the elastomeric family. Plastics, both thermoplastic and thermoset types, are very close both in terms of chemical structure and physical properties. Under a given set of conditions, plastics and elastomers will react much the same way. In fact, some polymer types are so versatile as to cross […]

Since natural rubber is the foundation of the rubber industry, all materials that are so — called elastomers, or rubber, are essentially compared against it. Therefore, elastomers are, generally, high molecular weight polymers that elongate or stretch, are cross­linkable, have the unique cured property of rebound or the ability to snap back to an original […]