High performance hotmelt window sealant

摘要

A hot applied, non-crosslinking, non-butyl, sealant. These sealants are composed of olefin polymers, styrenic block copolymers, an ethylene vinyl acetate copolymer, tackifying resins, plasticizers, and preferably inorganic fillers, and organosilane adhesion promoters. Optionally, the sealant may include UV absorbers, antioxidants, pigments, and the like. The sealants are suitable for use as edge sealants for insulated glass (IG) window units.

主权项

1. A hot melt sealant composition for use as an edge sealant in an insulated glass window unit, consisting essentially of:
a. about 2% to 50% by weight of a polyolefin polymer which is made by metallocene catalyzed polymerization; b. about 5% to 50% by weight of an amorphous poly-alpha-olefin polymer; c. about 2% to 25% by weight of an A-B-A styrenic block copolymer; d. about 2% to 25% by weight of an non-metallocene catalyzed ethylene-based copolymer, said non-metallocene catalyzed ethylene-based copolymer comprising an ethylene vinyl acetate copolymer or terpolymer having a vinyl acetate content of 14% to 50% by weight and a melt index of less than 400 g/10 minutes; e. about 10% to 50% by weight of a tackifier; f. about 5% to 25% by weight of a plasticizer; and g. about 0.1% to 3% by weight of an antioxidant stabilizer.