# Patent

## Title
Shell molding process and composition

## Abstract

A copolyamide of rose color is obtained.

## Background
## Claims

1. Process for the coloration of a linear polyamide which comprises effecting polycondensation of at least one amide monomer and a pigment that is insoluble in organic solvents, said pigment being of the polycyclic polycarboximide series containing 2 primary amine or haloformyl functional groups, wherein the pigment has the formula: ##STR7## wherein R represents the tetravalent residue of a substituted mono- or poly-cyclic aromatic hydrocarbon or a substituted or unsubstituted perinone, R.sub.1 represents a substituted or unsubstituted aliphatic, benzene, naphthalene or heterocyclic radical, R.sub.2 represents a substituted or unsubstituted aliphatic, aromatic or heterocyclic radical and Y represents an amino or haloformyl group; said pigment being copolycondensed in the polymer chain of said polyamide; wherein the proportion of said pigment is from 1%. (1 to 1000) to 2% (2 per 100) by weight of the monomer or monomers; and said at least one monomer is selected from the group consisting of 11-amino-undecanoic acid; .epsilon.-caprolactam; p-phenylenediamine, decamethylenediamine or hexamethylenediamine together with terephthalic, isophthalic, adipic or sebacic acid.

2. Process for the coloration of a linear polyamide which comprises effecting polycondensation of the monomer or monomers and a pigment that is insoluble in organic solvents, said pigment being obtained by condensing a compound of the formula (I) given in claim 1 wherein Y is a haloformyl group with a diamine of the formula: ##STR8## wherein R and R.sub.2 have the meanings given in claim 1; said pigment being copolycondensed in the polymer chain of said polyamide.

3. Process according to claim 2 wherein the proportion of pigment is from 1% (1 to 1000) to 2% (2 per 100 ) by weight of the monomer or monomers.

4. A copolycondensate obtained according to the process claimed in claim 1.

5. A copolycondensate obtained according to the process claimed in claim 2.

6. A copolycondensate obtained according to the process for the coloration of a linear polyamide which comprises effecting the polycondensation of amide monomer or monomers and a pigment having the formula: ##STR9##

7. A copolycondensate obtained according to the process for the coloration of a linear polyamide which comprises effecting the polycondensation of amide monomer or monomers and a pigment having the formula: ##STR10##

8. A copolycondensate obtained according to the process for the coloration of a linear polyamide which comprises effecting the polycondensation of amide monomer or monomers and a pigment having the formula: ##STR11##

9. A copolycondensate obtained according to the process for the coloration of a linear polyamide which comprises effecting the polycondensation of amide monomer or monomers and a pigment consisting of a mixture of a cis form having the formula: ##STR12## and of the trans form thereof.

10. A copolycondensate obtained according to the process for the coloration of a linear polyamide which comprises effecting the polycondensation of amide monomer or monomers and a pigment which is a hexa-imide resulting from the reaction of 1 mole of the dichloride of formula (V) in claim 11 with 2 moles of a diamine of the formula: ##STR13##