Process for preparation of cationic polyurethane emulsions

Claim 2

A PROCESS FOR PREPARING A CATIONIC POLYURETHANE EMULSION WHICH COMPRISES:

Claim 3

REACTION IN THE LIQUID PHASE AND IN A KETONE SOLVENT AT A TEMPERATURE OF FROM -20* TO +70*C (A) IS ISOCYANATES TERMINATED URETHANE PROPOLYMER PREPARED BY REACTING ORGANIC POLYOL HAVING A MOLECULAR WEIGHT IN THE RANGE OF FROM 200 TO 10,000 WITH AN EXCESS OF ORGANIC POLYISOCYANATE WITH (B) AN EXCESS OF POLYALKYLENE POLYAMINE HAVING AT LEAST TWO PRIMARY OR SECONDARY AMINO GROUP AND ALSO HAVING A FUNCTIONAL GROUP OF THE FORMULA -CH2CH(OH)-CH2X WHEREIN X IS CHLORO OR BROMO THE TOTAL MOLE NUMBER OF PRIMARY AND SECONDARY AMINO GROUPS IN THE POLYALKYLENE POLYMAINE BEING GREATER THAN THE TOTAL MOLE NUMBER OF ISOCYANATE GROUPS IN THE ISOCYANATE-TERMINATED URETHANE PROPOLYMER THE REACTION BEING CARRIED OUT UNTIL THE PRESENCE OF -NCO GROUPS CANNOT BE DETECTED WHEREBY TO FORM POLYURETHANE-UREA-POLYAMINE, AND

Claim 4

REACTION IN THE LIQUID PHASE AND IN A KETONE SOLVENT AT A TEMPERATURE OF FROM -20* TO +70*C (A) IS ISOCYANATES TERMINATED URETHANE PROPOLYMER PREPARED BY REACTING ORGANIC POLYOL HAVING A MOLECULAR WEIGHT IN THE RANGE OF FROM 200 TO 10,000 WITH AN EXCESS OF ORGANIC POLYISOCYANATE WITH (B) AN EXCESS OF POLYALKYLENE POLYAMINE HAVING AT LEAST TWO PRIMARY OR SECONDARY AMINO GROUP AND ALSO HAVING A FUNCTIONAL GROUP OF THE FORMULA -CH2CH(OH)-CH2X WHEREIN X IS CHLORO OR BROMO THE TOTAL MOLE NUMBER OF PRIMARY AND SECONDARY AMINO GROUPS IN THE POLYALKYLENE POLYMAINE BEING GREATER THAN THE TOTAL MOLE NUMBER OF ISOCYANATE GROUPS IN THE ISOCYANATE-TERMINATED URETHANE PROPOLYMER THE REACTION BEING CARRIED OUT UNTIL THE PRESENCE OF -NCO GROUPS CANNOT BE DETECTED WHEREBY TO FORM POLYURETHANE-UREA-POLYAMINE, AND

Claim 5

ADDING TO THE REACTION PRODUCT OF STEP 1 AN AQUEOUS SOLUTION FOR AN ACID TO FORM AN EMULSION THE AMOUNT OF WHICH IS SUCH AN AMOUNT THAT THE PH OF POLYURETHANEUREA POLYAMINE EMULSION BE KEPT WITHIN THE RANGE OF ABOUT 5 TO ABOUT 7.

Claim 6

ADDING TO THE REACTION PRODUCT OF STEP 1 AN AQUEOUS SOLUTION FOR AN ACID TO FORM AN EMULSION THE AMOUNT OF WHICH IS SUCH AN AMOUNT THAT THE PH OF POLYURETHANEUREA POLYAMINE EMULSION BE KEPT WITHIN THE RANGE OF ABOUT 5 TO ABOUT 7.

Claim 7

A process according to claim 1, in which the reactant (B) includes up to 50 percent, by molecular equivalent, of diamines or alkylene oxide adducts, acrylonitrile adducts or acrylate adducts of diamines.

Claim 8

adding to the reaction product of step 1 an aqueous solution of an acid to form an emulsion, the amount of which is such an amount that the pH of polyurethane-urea-polyamine emulsion be kept within the range of about 5 to about 7.

Claim 9

adding to the reaction product of step 1 an aqueous solution of an acid to form an emulsion, the amount of which is such an amount that the pH of polyurethane-urea-polyamine emulsion be kept within the range of about 5 to about 7.

Claim 10

treating the product of step 2 to remove the organic solvent therefrom and thereby obtaining an aqueous cationic polyurethane emulsion as a final product.

Claim 11

treating the product of step 2 to remove the organic solvent therefrom and thereby obtaining an aqueous cationic polyurethane emulsion as a final product.

Claim 12

A process according to claim 1, in which the ratio of (b) the total mole number of amino groups containing active hydrogen atoms in the polyalkylene polyamine, to (a) the total mole number of isocyanate groups in said urethane prepolymer is in the range of 1 < b/a < or = 5.

Claim 13

TREATING THE PRODUCT OF STEP 2 TO REMOVE THE ORGANIC SOLVENT THEREFROM AND THEREBY OBTAINING AN AQUEOUS CATIONIC POLYURETHANE EMULSION AS A FINAL PRODUCT.

Claim 14

TREATING THE PRODUCT OF STEP 2 TO REMOVE THE ORGANIC SOLVENT THEREFROM AND THEREBY OBTAINING AN AQUEOUS CATIONIC POLYURETHANE EMULSION AS A FINAL PRODUCT.

Claim 15

A process according to claim 1, in which the polyalkylene polyamine has the formula

Claim 16

A process according to claim 4, in which said polyalkylene polyamine is prepared by reacting, at from 10* to 80*C, for from 0.5 to 5 hours, epichlorohydrin or epibromohydrin with a polyamine having the formula

Claim 17

A process according to claim 1, in which said acid is selected from the group consisting of hydrochloric acid, nitric acid, acetic acid, propionic acid, monochloroacetic acid and glycolic acid.

Claim 18

A process according to claim 1, in which said acid is glycolic acid.

Claim 19

An aqueous cationic polyurethane emulsion prepared by the process of claim 1.

Claim 20

A polyurethane molded product prepared by forming the emulsion of claim 8 into a molded product and then heat-treating the product to effect cross-linking.