METHOD AND COMPOSITION FOR IMPROVED TEMPORARY WET STRENGTH

• Main Authors: RYAN, MICHAEL, PROVERB, ROBERT J, ZHANG, NAIJIE
• Format: Patent
• Language: English; French
• Published: 21.12.2006
• 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

A composition comprising a polymer that is a reaction product of : a copolymer backbone comprising; (i) at least one acrylamide component, (ii) at least one co-monomer, (iii) at least one initiator and (iv) at least one chain transfer agent ; and at least one cellulose reactive agent; wherein the copolymer backbone and cellulose reactive agent are combined with water to form a solution wherein the concentration of the copolymer backbone is about 0.1 to about 19% by weight based on the total weight of the solution. A process to make high solids copolymer backbone with low molecular weight and narrow molecular weight distribution has also been developed by a continuous polymerization process under refluxing conditions. In this process, a mixture of the acrylamide, co-monomer and chain transfer agent and the initiator are simultaneouly and continuously added to a heel of water. L'invention concerne un nouveau procédé destiné à fabriquer un squelette de polymère à teneur élevée en solides avec une répartition de poids moléculaire faible et étroite développé par des procédés de polymérisation continus dans des conditions de reflux. Dans ce procédé, un mélange de monomère d'acrylamide, un agent de migration de chaîne et un initiateur sont ajoutés simultanément et en continu aux résidus de solution aqueuse dans des conditions de reflux.