| 摘要 |
A pumpable, thermoplastic desiccated mastic capable of desiccating a sealed insulating glass unit. The disclosed compositions comprise: a resin component consisting essentially of: 4-75 % by weight of the resin component of a film former, the film former consisting essentially of a liquid polybutene polymer, alone or in combination with one or both of a polyisobutylene polymer having a weight average molecular weight of about 35,000 or more, and a butyl rubber having a weight average molecular weight of up to about 500,000, said butyl rubber, if present, representing less than 50% of the film former component; 25-96% by weight of the resin component of a non-crystalline homopolymer, copolymer, terpolymer or graft copolymer comprising polypropylene; and, 0-20% by weight of the resin component of a low volatile UV stable tackifier compatible with the film former and polypropylene components; and an adsorbent component comprising: at least 20% by weight of the composition of a moisture or moisture and volatile organic chemical adsorbing material; and 0-10% by weight of the composition of an adsorbent of volatile organic compounds, said adsorbent component being present in an amount less than the level which will cause the composition when tested as set forth in ASTM D-1238, Procedure B using a 1100 gram load and an 8 gram sample at 190 DEG C. to provide a melt flow time for a piston travel of 1 inch of more than 60 seconds.
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