Abstract:
A novel, pumpable, thermoplastic desiccated mastic capable of desiccating a sealed insulating glass unit. The compositions utilize adhesive materials which have a low vapor transmission rate but, nevertheless, have been found to effectively dry the air space in the unit. They do not contribute to chemical fogging and, in preferred embodiments, reduce or eliminate chemical fogging caused by other structures in the assembly. The compositions adhere well to the U-channel material and do not flow or sag under the normal range of service conditions encountered by an insulating glass assembly.The disclosed compositions comprise:4-30 weight percent of a film former selected from the group consisting of polyisobutylene polymers having a molecular weight in the range of about 35,000 to about 60,000, and mixtures of such polymers with minor amounts of a butyl rubber having a molecular weight of up to about 500,000;20-50 weight % of a non-crystalline homopolymer, copolymer, terpolymer or graft copolymer comprising polypropylene;0-20 weight % of a low volatile UV stable tackifier compatible with the film former and polypropylene components; and20-50 weight % of an adsorbent component comprising 20-50% 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.
Abstract:
A pumpable, thermoplastic desiccated mastic capable of desiccating a sealed insulating glass unit. The disclosed compositions comprise a defined resin component and a desiccant/adsorbent component comprising at least 20% by weight of the composition of a desiccant or moisture and volatile organic chemical adsorbing material. The 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 2.54 cm(1 inch) of more than 60 seconds.
Abstract:
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; andan 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.degree. C. to provide a melt flow time for a piston travel of 1 inch of more than 60 seconds.
Abstract:
A novel, pumpable, thermoplastic desiccated mastic capable of desiccating a scaled insulating glass unit. The compositions utilize adhesive materials which have a low vapor transmission rate but, nevertheless, have been found to effectively dry the air space in the unit. They do not contribute to chemical fogging and, in preferred embodiments, reduce or eliminate chemical fogging caused by other structures in the assembly. The compositions adhere well to the U-channel material and do not flow or sag under the normal range of service conditions encountered by an insulating glass assembly.The disclosed compositions comprise:4-30 weight percent of a film former selected from the group consisting of polyisobutylene polymers having a molecular weight in the range of about 35,000 to about 60,000, and mixtures of such polymers with minor amounts of a butyl rubber having a molecular weight of up to about 500,000;20-50 weight % of a non-crystalline homopolymer, copolymer, terpolymer or graft copolymer comprising polypropylene;0-20 weight % of a low volatile UV stable tackifier compatible with the film former and polypropylene components; and20-50 weight % of an adsorbent component comprising 20-50% 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.
Abstract:
A novel, pumpable, thermoplastic desiccated mastic capable of desiccating a sealed insulating glass unit. The compositions utilize adhesive materials which have a low vapor transmission rate but, nevertheless, have been found to effectively dry the air space in the unit. They do not contribute to chemical fogging and, in preferred embodiments, reduce or eliminate chemical fogging caused by other structures in the assembly. The compositions adhere well to the U-channel material and do not flow or sag under the normal range of service conditions encountered by an insulating glass assembly.The disclosed compositions comprise:4-30 weight percent of a film former selected from the group consisting of polyisobutylene polymers having a molecular weight in the range of about 35,000 to about 60,000, and mixtures of such polymers with minor amounts of a butyl rubber having a molecular weight of up to about 500,000;20-50 weight % of a non-crystalline homopolymer, copolymer, terpolymer or graft copolymer comprising polypropylene;0-20 weight % of a low volatile UV stable tackifier compatible with the film former and polypropylene components; and20-50 weight % of an adsorbent component comprising 20-50% 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.
Abstract:
A composition that includes a polyalphaolefin polymer and from about 20% by weight to about 70% by weight adsorbent, the composition being essentially free of a film forming agent.