# US 4,391,936 A · Molding blends

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- Number: US 4,391,936 A
- Document ID: US4391936A
- Status: Granted
- Kind: A
- Application number: 06/407,244
- Filed: 1982-08-11
- Granted: 1983-07-05
- Earliest claimed: 1980-11-20
- Assignees: E. I. Du Pont de Nemours and Company
- Inventors: Marion G. Waggoner
- Web page: https://patentgrep.com/patent/US4391936A

## CPC

- C09D 5/4438: {Binder based on epoxy/amine adducts, i.e. reaction products of polyepoxides with compounds containing amino groups only}
- C08K 3/04: Carbon
- C08K 5/34: Heterocyclic compounds having nitrogen in the ring
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

Certain polyamide molding blends containing carbon black and nigrosine are described which have greater elongation and impact strength than blends of such polyamide and carbon black alone.

## Claims

### Claim 1

A polyamide molding blend consisting essentially of
(a) at least one polyamide of film-forming molecular weight,
(b) about 1-3 percent by weight of polyamide of carbon black, and
(c) between about 0.1-2 percent by weight of polyamide of nigrosine.

### Claim 2 (depends on 1)

The polyamide molding blend of claim 1 in which the polyamide is 66 nylon.

### Claim 3 (depends on 1)

The polyamide molding blend of claim 1 in which the polyamide is 6 nylon.