Coated abrasive containing epoxy binder and method of producing the same
AssigneeMinnesota Mining and Manufacturing Company
InventorsGerald E. Korbel, Janis Robins, Harold E. Rude
Life of this patent
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Abstract
The use of an aromatic amine salt of a substituted pentafluoroantimonic acid as a curing agent for epoxy resins, and the use of the epoxy resin compositions as binders for abrasives in abrasive sheet products, are disclosed. The aromatic amines are selected from aniline and hindered aromatic amines.
Claims14
In a coated abrasive product including abrasive granules which are supported on and adherently bonded to at least one major surface of a backing sheet by a make coating of a first resinous binder material and a size coating of a second resinous binder material, the improvement comprising at least one of the said resinous materials being epoxy resin, said epoxy resin characterized by comprising cured epoxy resin and residual curing agent derived from substituted pentafluoroantimonic acid and an aromatic amine selected from the group consisting of aniline and hindered amine.
In a coated abrasive product including abrasive granules which are supported on and adherently bonded to at least one major surface of a backing sheet by a resinous binder material, the improvement comprising epoxy resin as the resinous binder material, said epoxy resin being characterized by comprising cured epoxy resin and residual curing agent derived from substituted pentafluoroantimonic acid and an aromatic amine selected from the group consisting of aniline and hindered amine.
In a method of making coated abrasive products having the steps of
- (1) uniformly coating a backing sheet with a make coat of a first resinous material in liquid form;
- (2) depositing a plurality of abrasive granules uniformly over the surface of said make coat of first resinous material;
- (3) curing said first resinous material to adherently bond said granules to said backing sheet surface;
- (4) coating over said make coat and said granules with a size coat of a second resinous material;
- and
- (5) curing the resultant coated product until said second resinous material is solid, the improvement comprising employing, as at least one of said first or said second resinous binder materials, a latent room-temperature stable, curable system comprised of
- (A) epoxy resin composition having a 1,2-epoxy equivalency greater than one;
- and
- (B) a curing agent in an amount sufficient to cure said composition on heating comprising
- (1) substituted pentafluoroantimonic acid having the general formula H.sup.+ SbF.sub.5 X.sup.- wherein X is halogen, a hydroxy, or an OR group wherein OR is the residue of an aliphatic or aromatic alcohol;
- and
- (2) an aromatic amine selected from the group consisting of aniline;
- and hindered amine the mole ratio of said substituted pentafluoroantimonic acid to aromatic amine being in the range of 1:05 to 1:4.
Dependencies are inferred from the claim text.