摘要 |
Thermoplastic polymer foams having sound deadening properties satisfactory f or demanding applications are provided which have mechanical strength, which ar e economical to manufacture, and which are hydrolytically stable. Methods of preparing these foams are also provided. The foams are useful in sound management, cushion packaging, filtering, and fluid absorption and exhibit o ne or more of the following proprties: 1) average cell size greater than about 2 mm; 2) substantially open-cell structure and 3) relatively large pores connecting the cells. In order that the foam be acoustically active, the foa m should possess a substiantially open-cell structure and a relatively low airflow resistivity. Foams with substantially open-cell structure and relatively low airflow resistivity are prepared by mechanically opening a fo am having an average cell size greater than about 2 mm. In most cases, such mechanical opening creates relatively large pores connecting the cells.</SDO AB>
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