Control of wool shrinkage by polyamides

Claim 1

THE METHOD OF SHRINKPROOFING WOOL WITH WATER-INSOLUBLE POLYAMIDES WHILE RETAINING SUBSTANTIALLY NORMAL HAND WHICH COMPRISES IMPREGNATING THE WOOL WITH AN ORGANIC SOLVENT SOLUTION OF A WATER INSOLUBLE SYNTHETIC POLYAMIDE WHICH CONTAINS HYDROGEN-BEARING AMIDE NITROGEN ATOMS AND HAVING AN INTRINSIC VISCOSITY OF AT LEAST 0.4 TO DEPOSIT AN AMOUNT NOT EXCEEDING FROM ABOUT 1% TO 25% BY WEIGHT ON THE WOOL OF POLYAMIDE INSUFFICIENT TO MODIFY THE NORMAL HAND OF THE WOOL BUT SUFFICIENT TO GIVE SHRINK-PROOFING AND DIRECTLY HEATING THE IMPREGNATED WOOL IN THE ABSENCE OF PRECIPITATING AGENTS FOR THE POLYAMIDE THEREBY AVOIDING PRECIPITATION OF THE POLYAMIDE AT A TEMPERATURE BELOW THAT OF SUBSTANTIAL INJURY TO WOOL OR POLYAMIDE TO INSOLUBILIZE THE POLYAMIDE AND TO GIVE A SHINKPROOFED WOOL OF NORMAL HAND, THE ORGANIC SOLVENT BEING A SOLVENT WHICH DISSOLVES AND IS MISCIBLE WITH THE POLYCARBONAMIDE.

Claim 2

THE METHOD OF SHRINKPROOFING WOOL WITH WATER-INSOLUBLE POLYAMIDES WHILE RETAINING SUBSTANTIALLY NORMAL HAND WHICH COMPRISES IMPREGNATING THE WOOL WITH AN ORGANIC SOLVENT SOLUTION OF A WATER INSOLUBLE SYNTHETIC POLYAMIDE WHICH CONTAINS HYDROGEN-BEARING AMIDE NITROGEN ATOMS AND HAVING AN INTRINSIC VISCOSITY OF AT LEAST 0.4 TO DEPOSIT AN AMOUNT NOT EXCEEDING FROM ABOUT 1% TO 25% BY WEIGHT ON THE WOOL OF POLYAMIDE INSUFFICIENT TO MODIFY THE NORMAL HAND OF THE WOOL BUT SUFFICIENT TO GIVE SHRINK-PROOFING AND DIRECTLY HEATING THE IMPREGNATED WOOL IN THE ABSENCE OF PRECIPITATING AGENTS FOR THE POLYAMIDE THEREBY AVOIDING PRECIPITATION OF THE POLYAMIDE AT A TEMPERATURE BELOW THAT OF SUBSTANTIAL INJURY TO WOOL OR POLYAMIDE TO INSOLUBILIZE THE POLYAMIDE AND TO GIVE A SHINKPROOFED WOOL OF NORMAL HAND, THE ORGANIC SOLVENT BEING A SOLVENT WHICH DISSOLVES AND IS MISCIBLE WITH THE POLYCARBONAMIDE.