Coating method using aqueous glycidyl compound-amine hardner-thermoplastic resin compositions
AssigneeSchering Corporation
InventorsManfred Drawert, Horst Krase, Hans D. Skoda
Life of this patent
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Abstract
A method for coating or printing a substrate by applying thereto a coating or printing ink vehicle which is a solution of a curable mixture of synthetic resins, evaporating a solvent therefrom a give a physically dry and clear film, and maintaining said film at or slightly above room temperature to cure or harden said vehicle, said vehicle including a glycidyl compound, one or more amines as curing or hardening agents for said glycidyl compound, a thermoplastic resin having free carboxyl groups which is inert at the aforementioned curing temperatures, a solvent, and optional commonly used auxiliaries.
Claims9
A method for coating or printing a substrate, which method comprises applying to said substrate a hardenable coating or printing ink vehicle which is a solution comprising
- (I) an aqueous solvent and, dissolved therein,
- (II) a mixture of water soluble components comprising
- (A) an aliphatic glycidyl compound having an epoxy value from 0.4 to 0.7 and more than one epoxy group per molecule;
- (B) an amine component, reactive with said glycidyl compound as a hardener therefor at or slightly above room temperature, in an amount such that the ratio of epoxy groups in said glycidyl compound to amino hydrogen atoms in said amine component is from 0.5:1 to 1.5:1, said amine component being at least one member selected from the group consisting of
- (1) aliphatic amines of the formula
- H.sub.2 N--(CHR).sub.x --NH.sub.2,
- wherein R is hydrogen or alkyl having from 1 to 4 carbon atoms and x is an integer from 2 to 6,
- (2) polyalkylene polyamines of the formula
- H.sub.2 N--[(CHR).sub.x ].sub.y --H,
- wherein R and X have the meanings given above and y is an integer from 2 to 4,
- (3) polyether amines of the formula
- H.sub.2 N--(CH.sub.2).sub.n --O--(R.sup.1 --O).sub.z --(CH.sub.2).sub.n --NH.sub.2,
- wherein R.sup.1 is substituted or unsubstituted alkyl having 1 to 4 carbon atoms, z is 0, 1, 2, or 3, and n is an integer from 2 to 5,
- (4) heterocyclic amines of the formula ##STR4## wherein A is C or N and x is an integer from 2 to 6, (5) an alkanolamine of the formula
- H.sub.2 N--R.sup.2 --OH,
- wherein R.sup.2 is --(CRR).sub.x and R and x have the meaning given above, or R.sup.2 is --(CH.sub.2).sub.2 --O--(CH.sub.2).sub.2 --, and
- (6) adducts having free amino groups and formed between
- (a) an aliphatic glycidyl compound as in (A) and
- (b) from 0.8 to 1.2 moles, per epoxy group of (a), of
- (i) at least one of said amines (B)(1) to (B)(4), or
- (ii) at least one of said amines (B)(1) to (B)(4) containing amine (B)(5) in an amount up to 50 equivalent percent;
- and
- (C) a thermoplastic resin having free carboxyl groups which is inert at the room temperature hardening conditions or at the hardening conditions slightly above room temperature at which the epoxy compound (II)(A) is cured and which has an acid number from 40 to 200, in an amount such that there are from 1 to 10 amine groups of one or more of the amines according to (B) per carboxyl group present in (C),
- evaporating the solvent from said vehicle to form a film, and then maintaining said film at or slightly above room temperature to harden it.
Dependencies are inferred from the claim text.