Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1994-10-21
1996-04-23
Mulcahy, Peter D.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
294695, 29530, B32B 1700
Patent
active
055099840
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; and
20-50 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.
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ASTM, E 773-88, "Standard Test Methods For Seal Durability Of Sealed Insulating Glass Units".
Popular Science, Aug., 1992, "Closing The Gaps In Window Efficiency", By Alex Wilson.
Edgetech, A Division of Lauren, Technical Report, "Super Spacer" By Michael Glover and Gerhard Reichert, Sep., 1989.
Meyer Paul J.
Spinks Anne
H. B. Fuller Licensing & Financing Inc.
Mulcahy Peter D.
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