Method of preparing rayon plisse

Claim 1

A METHOD OF PREPARING A PLISSE FABRIC FROM A TEXTILE FABRIC FORMED PREDOMINANTLY OF REGENERATED CELLULOSE WHICH COMPRISES APPLYING TO AND IMPREGNATING THE ENTIRE TEXTILE FABRIC WITH AN AQUEOUS MEDIUM COMPRISING FROM 1-6% BY WEIGHT OF WATER-SOLUBLE CELLULOSE ETHER SELECTED FROM THE GROUP CONSISTING OF UNSUBSTITUTED ALKYL CELLULOSE ETHERS, CARBOXYALKYL CELLULOSE ETHERS, HYDROXYALKYL CELLULOSE ETHERS, MIXED ALKYL HYDROXYALKYL CELLULOSE ETHERS, MIXED ALKYL CARBOXYALKYL CELLULOSE ETHERS AND WATER-SOLUBLE ALKALI METAL SALTS THEREOF, FROM ABOUT 1-10% BY WEIGHT OF A CROSS-LINKING AGENT SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC MONO-ALDEHYDES CONTAINING FROM 1-8 CARBON ATOMS AND THE ACETAL CONDENSATION PRODUCT OF AN ALIPHATIC MONO-ALDEHYDE CONTAINING NOT MORE THAN 8 CARBON ATOMS AND AT LEAST ONE DIALKYLENE GLYCOL IN WHICH THE ALKYLENE RADICAL HAS FROM 2-4 CARBON ATOMS, SAID CONDENSATION PRODUCT CONTAINING PER MOLECULE AT LEAST TWO DIOXYALKYLENE RADICALS DERIVED FROM SAID DIALKYLENE GLYCOL AND AT LEAST TWO ALKYLIDENE RADICALS DERIVED FROM SAID ALDEHYDE; AND AN ACIDIC CURING CATALYST, DRYING THE IMPREGNATED TEXTILE FABRIC UNDER TENSION AT FIXED DIMENSIONS, CURING THE DRIED TEXTILE FABRIC WHILE MAINTAINING SAID FIXED DIMENSIONS, RELAXING THE CURED TEXTILE FABRIC AND THEN APPLYING A PLISSE FORMING AMOUNT OF CAUSTIC SODA TO SELECTED SPACED AREAS OF SAID FABRIC IN A PLISSE FORMING PATTERN, NEUTRALIZING EXCESS CAUSTIC WITH DILUTE ACID, WASHING, AND DRYING SAID FABRIC.

Claim 2

A METHOD OF PREPARING A PLISSE FABRIC FROM A TEXTILE FABRIC FORMED PREDOMINANTLY OF REGENERATED CELLULOSE WHICH COMPRISES APPLYING TO AND IMPREGNATING THE ENTIRE TEXTILE FABRIC WITH AN AQUEOUS MEDIUM COMPRISING FROM 1-6% BY WEIGHT OF WATER-SOLUBLE CELLULOSE ETHER SELECTED FROM THE GROUP CONSISTING OF UNSUBSTITUTED ALKYL CELLULOSE ETHERS, CARBOXYALKYL CELLULOSE ETHERS, HYDROXYALKYL CELLULOSE ETHERS, MIXED ALKYL HYDROXYALKYL CELLULOSE ETHERS, MIXED ALKYL CARBOXYALKYL CELLULOSE ETHERS AND WATER-SOLUBLE ALKALI METAL SALTS THEREOF, FROM ABOUT 1-10% BY WEIGHT OF A CROSS-LINKING AGENT SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC MONO-ALDEHYDES CONTAINING FROM 1-8 CARBON ATOMS AND THE ACETAL CONDENSATION PRODUCT OF AN ALIPHATIC MONO-ALDEHYDE CONTAINING NOT MORE THAN 8 CARBON ATOMS AND AT LEAST ONE DIALKYLENE GLYCOL IN WHICH THE ALKYLENE RADICAL HAS FROM 2-4 CARBON ATOMS, SAID CONDENSATION PRODUCT CONTAINING PER MOLECULE AT LEAST TWO DIOXYALKYLENE RADICALS DERIVED FROM SAID DIALKYLENE GLYCOL AND AT LEAST TWO ALKYLIDENE RADICALS DERIVED FROM SAID ALDEHYDE; AND AN ACIDIC CURING CATALYST, DRYING THE IMPREGNATED TEXTILE FABRIC UNDER TENSION AT FIXED DIMENSIONS, CURING THE DRIED TEXTILE FABRIC WHILE MAINTAINING SAID FIXED DIMENSIONS, RELAXING THE CURED TEXTILE FABRIC AND THEN APPLYING A PLISSE FORMING AMOUNT OF CAUSTIC SODA TO SELECTED SPACED AREAS OF SAID FABRIC IN A PLISSE FORMING PATTERN, NEUTRALIZING EXCESS CAUSTIC WITH DILUTE ACID, WASHING, AND DRYING SAID FABRIC.