Patent ID: 6112477
Filing Date: 2000-09-05
Classification: C08L,C09J,C09K,E06B,Y10T

Abstract:
A mastic composition, the composition being thermoplastic and being pumpable, whereby when tested as set forth in ASTM D-1238, Procedure B using a 1100 gram load and an 8 gram sample at 190.degree. C., a melt flow time of no more than 60 seconds for a piston travel of 1 inch is obtained, the composition comprising:A) a resin component consisting essentially of:i) 4-75% by weight of the resin component of a film former, the film former including a member selected from the group consisting of:a) a homogeneous, substantially linear ethylene/.alpha.-olefin interpolymer;b) a linear, Y block or star block copolymer rubber; orc) mixtures of a, and/or b;alone, or combination with one or more polymers selected from the group consisting of:d) a liquid polybutene polymer;e) a polyisobutylene polymer having a weight average molecular weight of about 35,000 or more; andf) 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;ii) 25-96% by weight of the resin component of an alkylene polymer component consisting of a member selected from the group consisting of:a) a non-crystalline homopolymer, copolymer, terpolymer or graft copolymer comprising a monomeric unit of propylene;b) a homogeneous substantially linear ethylene/.alpha.-olefin interpolymer; andc) mixtures thereof;iii) 0-20% by weight of the resin component of a low volatile UV stable tackifier compatible with the film former and alkylene components; andB) a desiccant/adsorbent component comprising:i) at least 20% by weight of the composition of a desiccant or moisture and volatile organic chemical adsorbing material; andii) 0-10% by weight of the composition of an adsorbent of volatile organic compounds,said desiccant/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.degree. C. to provide a melt flow time for a piston travel of 1 inch of more than 60 seconds.