Process bonded reinforced plastic structures
AssigneeMonsanto Company
InventorsDonald D. Donermeyer, Joseph G. Martins, David A. Fabel
Life of this patent
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Abstract
A process for bonding a reinforced plastic structure which comprises coating reinforced plastic parts of sheet molding compounds or bulk molding compound with a primer coat and bonding together with a thermoplastic block copolymer.
Claims9
A process for bonding a first reinforced plastic part to a second reinforced plastic part, which comprises applying a primer coating solution to the bonding surfaces, evaporating solvent from the primer coating to provide a film of dry primer, placing the first reinforced plastic part in a fixture adapted to hold the first-reinforced plastic part, applying a molten thermoplastic adhesive to the primed surface of the first reinforced plastic part, mating the second reinforced plastic part to the first reinforced plastic part to form a bond, retaining the second reinforced plastic part in the fixture against the first reinforced plastic part by application of a pressure of at least 20 kPa substantially uniformly over the bond, and cooling the bonded parts to allow the bond to set, wherein the primer coating comprises an epoxidized novolac resin and a resinous amidopolyamine in a weight ratio in the range of about 2:1 to about 1:2, and wherein the thermoplastic adhesive is a block copolymer comprising 40 to 80 wt % crystalline polyester or polyamide segments and from 20 to 60 wt % amorphous polyamide or polyether segments, and has a crystalline melting point above 155.degree. C. and a number average molecular weight in the range of about 8000 to about 30000.
Dependencies are inferred from the claim text.