Cross-linkable nylon compositions for coating applications, processes using such compositions, and articles made therefrom
AssigneeE. I. Du Pont de Nemours and Company
InventorRolando U. Pagilagan
Life of this patent
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Abstract
Cross-linkable nylon compositions used as coatings for nylon and polyester substrates are disclosed. These compositions comprise a water-soluble polyamide derived from select polyether diamines and select aliphatic dicarboxylic acids, a water-soluble formaldehyde-derived crosslinking agent, and optionally an acid catalyst. Processes for their application in coating substrates and various coated articles are also described.
Claims10
Coating solutions which suitably adhere to substrates of polyamides, polyesters and mixtures thereof, comprising
- (a) a water-soluble polyamide having a solubility in water at 23 C. of at least 0.5 weight percent and derived from the reaction of adipic acid and ether diamines with a molecular weight of 148 to 396 and represented by the general formulas
- H2N—R1—O—R2—O—R1—NH2
- wherein R1 and R2 are either —CH2—CH2— or —CH2—CH2—CH2—;
- H2N—R1(—O—CH2—CH2—)XO—R1−NH2—
- wherein R1 is either —CH2—CH2— or —CH2—CH2—CH— and
- X has an average value of 2 to 6;
- and mixtures thereof;
- (b) 1 to 100 weight percent based on the weight of the water-soluble polyamide of a water-soluble crosslinking agent selected from the reaction product of formaldehyde and amine-containing compounds;
- and
- (c) 0 to 20 weight percent based on the weight of the crosslinking agent of an organic or inorganic acid having a pka greater than 1.9.
A process for coating substrates of nylon, polyester or mixtures thereof with water-soluble nylon and subsequently insolubilizing the water-soluble nylon disposed thereon, comprising:
- (i) Providing a substrate comprising nylon, polyester or mixtures thereof;
- (ii) Coating said substrate with a water-soluble polyamide having a solubility in water at 23 C. of at least 0.5 weight percent and derived from the reaction of adipic acid and ether diamines with a molecular weight of 148 to 396 and represented by the general formulas
- H2N—R1—O—R2—O—R1—NH2
- wherein R1 and R2 are either —CH2—CH2— or —CH2—CH2—CH2—;
- H2N—R1(—O—CH2—CH2—)XO—R1—NH2
- wherein R1 is either —CH2—CH2— or —CH2—CH2—CH2— and
- X has an average value of 2 to 6;
- and mixtures thereof;
- (iii) coating said substrate in solution with the water-soluble polyamide in (ii) above with 1 to 100 weight percent based on the weight of the water-soluble polyamide of a water-soluble crosslinking agent selected from the reaction product of formaldehyde and amine-containing compounds;
- and
- (iv) optionally coating said substrate in solution with the water-soluble polyamide in (ii) above and the crosslinking agent in (iii) above with 0 to 20 weight percent based on the weight of the cross linking agent of an organic or inorganic acid having a pKa greater than 1.9.
Dependencies are inferred from the claim text.