摘要:
THE DISCLOSURE IS DIRECTED TO CARBOXYPHENYL ETHERS OF STARCH AND TO A METHOD OF PREPARING THE SAME, THE CARBOXYPHENYL ETHERS OF STARCH WILL GELATINIZE OR DISPERSE READILY BY HEATING IN WATER TO FORM PASTES HAVING RELATIVELY STABLE VISCOSITY. ALSO, THE CARBOXYPHENYL ETHERS OF STARCH HAVE GOOD FILM FORMING CHARACTERISTICS.
摘要:
A GELATINIZABLE CROSSLINKED CATIONIC STARCH ESPECIALLY SUITABLE FOR PAPER SIZING IS PRODUCED BY (1) REACTING STARCH WITH AN ALKALI-CATALYZABLE CROSSLINKING AGENT AND THE REACTION PRODUCT OF THE CROSSLINKING AGENT WITH AMMONIA OR WITH AN AMINE AND (2) DEPOLYMERIZING THE RESULTANT CATIONIC CROSSLINKED PRODUCT.
摘要:
The invention is directed to a process for producing a formaldehyde-treated starch. A material which provides ammonium or amine groups is provided in a slurry of formaldehyde-treated starch containing free or unreacted formaldehyde at a pH of above about 6.5. The material combines with the free or unreacted formaldehyde and thus reduces vaporization of the formaldehyde.