PRODUCTION OF LATEX FOR PAPER COATING

• Main Authors: NISHIOKA TOSHITAKA, HIYOUDA YORITSUNE
• Format: Patent
• Language: English
• Published: 09.12.1997
• Edition: 6
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; IMPREGNATING OR COATING OF PAPER; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PAPER NOT OTHERWISE PROVIDED FOR; PAPER-MAKING; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; PRODUCTION OF CELLULOSE; PULP COMPOSITIONS; TEXTILES; THEIR PREPARATION OR CHEMICAL WORKING-UP; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G

PROBLEM TO BE SOLVED: To obtain a latex which is suitably used in high-speed coating and can give coated paper articles excellent in surface strength and surface uniformity by emulsion-polymerizing a specified monomer composition in the presence of α-methylstyrene dimer and purifying the product with diatomaceous earth. SOLUTION: A monomer composition comprising 15-75wt.% aliphatic conjugated diene monomer, 1-10wt.% ethylenically unsaturated carboxylic acid monomer and 15-84wt.% other monomers copolymerizable therewith is emulsion- polymerized in the presence of 0.05-10 pts.wt., per 100 pts.wt. monomer, α- methylstyrene dimer to obtain a copolymer latex. The obtained copolymer latex is purified with 0.2-5 pts.wt., per 100 pts.wt. solid matter of the latex, diatomaceous earth to obtain a latex for paper coating. The obtained latex can give paper-coating compositions excellent in antifoaming properties, mechanical stability and flowability and suitably usable in high-speed coating.