Patent ID: 6015865
Filing Date: 2000-01-18
Classification: C08G,C08L,C09D,C09J

Abstract:
A reactive hot melt adhesive composition comprising the reaction product of a thermally activatable latent curing agent with(a) about 0.5 to about 1 equivalent of an epoxy resin which is solid at room temperature prepared from bisphenol A or bisphenol F and epichlorohydrin having an epoxide equivalent weight of from about 400 to about 700,(b) about 0.5 to about 1 equivalent of an epoxy resin which is liquid at room temperature prepared from bispbenol A or bisphenol F and epichlorohydrin having an epoxide equivalent weight of from about 150 to about 220, and(c) about 0.125 to about 0.5 equivalent of an amino-terminated polyalkylene glycol selected from the group consisting of polyethylene and polypropylene glycols, wherein said epoxy resins (a) and (b) are present in an amount such that a stoichiometric excess of at least 1 equivalent of epoxy groups over the amino groups is provided, said amino-terminated polyalkylene glycol comprisingi) a linear amino-terminated polyethylene glycol corresponding to formula IH.sub.2 N--(CH.sub.2).sub.2 --[O--(CH.sub.2).sub.2 --O--(CH.sub.2).sub.2 ].sub.n --NH.sub.2 (I)wherein n is a number from about 17 to about 27 orii) a linear amino-terminated polypropylene glycol corresponding to formula IIH.sub.2 NCH(CH.sub.3)CH.sub.2 [OCH.sub.2 CH(CH.sub.3)].sub.n NH.sub.2(II)wherein n is 40 to 200, with an average molecular weight of >2000, or,iii) a linear amino-terminated polyethylene glycol of the formula I in which n=17 to 27, or a linear amino-terminated polypropylene glycol of the formula II, in which n is 5 to 200, with an average molecular weight of >360, together with a trifunctional amino-terminated polypropylene glycol of the formula III ##STR4## in which A is a --CH.sub.3 CH.sub.2 C(CH.sub.2).sub.3 or a ##STR5## group and x, y and z independently of each other are 1 to 40, with an average molecular weight of >400, and wherein 4 to 40% of the epoxy equivalents of the total epoxy resin component are replaced by (a) an adduct of dimeric fatty acids on epoxy resins prepared from diglycidyl ethers of bisphenol A or F, or (b) an adduct of carboxyl-terminated butadiene-nitrile rubber on epoxy resins prepared from diglycidyl ethers of bisphenol A or F.