Method of joining two bodies after treatment with an inorganic colloid

Claim 2

The method as defined in claim 1 wherein said element comprises Fe.

Claim 3

The method as defined in claim 1 which further comprises treating the contacted surfaces to obtain a relatively permanent joint.

Claim 4

In a method of improving the joint strength of adherends, which comprises: a. applying an adhesive, which forms a contact angle of 0* with a contacting surface of both adherends, to a contacting surface of at least one adherend; b. positioning the adhesive-coated contacting surface to face the corresponding contacting surface of the other adherend; and c. contacting together the facing surfaces to form a joint, wherein the improvement comprises: prior to step (c) above, treating either the contacting surface or the adhesive-coated contacting surface of at least one adherend with a stable aqueous colloidal solution, formed by a hydrolysis and nucleation reaction, comprising insoluble hydrous oxide particles of an element selected from the group consisting of Be, Mg, Ti, Zr, V, Cr, Mo, W, Mn, Fe, Co, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Hg, Al, In, Tl, Si, Ge, Sn, Pb, Bi, La, Ce, Th, U and mixtures thereof, said particles having a size within the range of 10A to 10,000A and said hydrolysis reaction including at least (1) dissolution of a salt of said selected element in an aqueous medium and (2) maintenance of the pH of said aqueous medium at a point where no flocculate results.

Claim 5

The method as defined in claim 5 wherein said element comprises Sn.

Claim 6

The method as defined in claim 5 wherein said element comprises Fe.

Claim 7

In an improved method of joining two substrates, which comprises: applying an adhesive, which forms a contacting angle of 0* with a contacting surface of the two substrates, to a contacting surface of at least one substrate; and contacting the adheSive-coated surface with the contacting surface of the other substrate, wherein the improvement comprises: applying a stable colloidal aqueous hydrous oxide solution of an element selected from Sn and Fe to at least one interface between the adhesive and the contacting surface.

Claim 8

In an improved method of joining two bodies, comprising the steps of: a. applying an epoxy adhesive to a contacting region of a surface of at least one of the bodies, said epoxy adhesive and contacting region forming an angle of 0*; and b. contacting together the respective contacting regions of the bodies to obtain a joining thereof, wherein the improvement comprises: prior to step (a) above, treating a contacting region of a surface of at least one of the bodies with a stable aqueous colloidal solution, formed by a hydrolysis and nucleation reaction, comprising insoluble hydrous oxide particles of an element selected from the group consisting of Be, Mg, Ti, Zr, V, Cr, Mo, W, Mn, Fe, Co, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Hg, Al, In, Tl, Si, Ge, Sn, Pb, Bi, La, Ce, Th, U and mixtures thereof, said particles having a size within the range of 10A to 10,000A and said hydrolysis reaction including at least (1) dissolution of a salt of said selected element in an aqueous medium and (2) maintenance of the pH of said aqueous medium at a point where no flocculate results

Claim 9

In an improved method of improving the joint strength of adherends comprising at least one adherend selected from the group consisting of a polyimide and a polyester, which comprises: a. applying a liquid epoxy adhesive, having an epoxide equivalent of 175 to 210 and an average molecular weight of 350 to 400, to a contacting surface of at least one adherend, said epoxy adhesive and contacting surface forming a contact angle of 0*; and b. contacting together the respective contacting surfaces of each adherend to form the joint, wherein the improvement comprises: prior to step (b) above, treating either the contacting surface or the adhesive-coated contacting surface of at least one adherend with a stable aqueous colloidal solution, formed by a hydrolysis and nucleation reaction, comprising insoluble hydrous oxide particles of an element selected from the group consisting of Be, Mg, Ti, Zr, V, Cr, Mo, W, Mn, Fe, Co, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Hg, Al, In, Tl, Si, Ge, Sn, Pb, Bi, La, Ce, Th, U and mixtures thereof, said particles having a size within the range of 10A to 10,000A and said hydrolysis reaction including at least (1) dissolution of a salt of said selected element in an aqueous medium and (2) maintenance of the pH of said aqueous medium at a point where no flocculate results.

Claim 10

The method as defined in claim 1 wherein said adhesive comprises an epoxy adhesive.