Encapsulation blowing agent

A case, such as an attache case or briefcase, has a cover panel, back panel, front panel, top panel, bottom panel opposing tabs and opposing side panels. It is made from a unitary sheet of expanded PE, which is produced by encapsulating a thermoplastic blowing agent... 

Expandable SAN microspheres are prepared by polymerizing a mixture of styrene and AN with a volatile liquid blowing agent in an encapsulating system. Expandable microspheres of larger size, narrower size distribution and improved expansion characteristics are obtained using an alcohol in the polymerization system, i.e., methanol (7). 

Expandable microsphere Thermoplastic microspheres are droplets of hquid hydrocarbon encapsulated in a shell of a thermoplastic polymer. When exposed to heat, the shell softens and the hydrocarbon gasifies, and the microsphere expands firom, typically, 12 to 40 pm and the density drops from 1000 to 30-40 kg/m. The microspheres can be used either as a form of blowing agent, or may be supphed in expanded form for use as a lightweight filler. The activating temperature of mold and material is lOOC (212F). 

Ethylene vinyl acetate, commonly referenced as EVA, is a rubberlike polymer that sometimes can be processed on either rubber or plastics processing equipment. EVA has good clarity and can be compounded with peroxide curatives and sometimes blowing agents (for foam) for use in athletic shoes (for absorbing shock), ski boots, hose, tubes, wire insulation, solar cell encapsulation, and medical applications. 

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