A method of producing a polyvinyl butyral resin composition including: preparing a reaction composition including i) a polyvinyl alcohol resin, ii) a butanal, and iii) a butanoic acid; and obtaining the polyvinyl butyral resin composition, wherein a conversion rate of butanal is 77% or more.

A method of producing a polyvinyl butyral resin composition including: preparing a reaction composition including i) a polyvinyl alcohol resin, ii) a butanal, and iii) a butanoic acid; and obtaining the polyvinyl butyral resin composition, wherein a conversion rate of butanal is 77% or more.

The invention relates to a method for producing anionic polymers that are hydrosoluble in an aqueous solution, comprising at least the following successive steps: b) polymerisation, in an aqueous solution, of anionic monomers containing at least 5 mol % of 2-acrylamido-2-methylpropane sulfonic acid and/or one of the salts thereof and optionally non-ionic monomers up to a mass concentration of polymer A of between 5 and 40%, b) addition of at least one aldehyde into the solution produced in step a), and c) acidification to a pH of between 3 and 4 of the solution produced in step b). The invention also relates to the use thereof in a paper-making method.

The invention relates to a method for producing anionic polymers that are hydrosoluble in an aqueous solution, comprising at least the following successive steps: b) polymerisation, in an aqueous solution, of anionic monomers containing at least 5 mol % of 2-acrylamido-2-methylpropane sulfonic acid and/or one of the salts thereof and optionally non-ionic monomers up to a mass concentration of polymer A of between 5 and 40%, b) addition of at least one aldehyde into the solution produced in step a), and c) acidification to a pH of between 3 and 4 of the solution produced in step b). The invention also relates to the use thereof in a paper-making method.

The present invention provides an epoxy adhesive composition that is excellent in compatibility and storage stability, has high strength and excellent adhesiveness, is capable of reducing occurrence of warping or peeling when used for bonding different materials, and is also excellent in impact resistance after being cured. Provided is an epoxy adhesive composition including: a modified polyvinyl acetal resin having a constitutional unit with an acid-modified group; and an epoxy resin, the epoxy adhesive composition containing an organic solvent in an amount of 10.0% by weight or less.

The present invention provides an epoxy adhesive composition that is excellent in compatibility and storage stability, has high strength and excellent adhesiveness, is capable of reducing occurrence of warping or peeling when used for bonding different materials, and is also excellent in impact resistance after being cured. Provided is an epoxy adhesive composition including: a modified polyvinyl acetal resin having a constitutional unit with an acid-modified group; and an epoxy resin, the epoxy adhesive composition containing an organic solvent in an amount of 10.0% by weight or less.

Ethylene-C.sub.3-C.sub.10 alpha olefin copolymers, dispersants and lubricating oils/fuel compositions incorporating dispersants, and related methods are generally described herein. The copolymer may comprise ethylene-derived units and C.sub.3-C.sub.10 alpha-olefin-derived units. The C.sub.3-C.sub.10 alpha-olefin-derived units may have a carbon number from three to ten. For example, the C.sub.3-C.sub.10 alpha-olefin-derived units may be propylene-derived units. The dispersants may be made from copolymers having low metal and/or fluorine contents.

Ethylene-C.sub.3-C.sub.10 alpha olefin copolymers, dispersants and lubricating oils/fuel compositions incorporating dispersants, and related methods are generally described herein. The copolymer may comprise ethylene-derived units and C.sub.3-C.sub.10 alpha-olefin-derived units. The C.sub.3-C.sub.10 alpha-olefin-derived units may have a carbon number from three to ten. For example, the C.sub.3-C.sub.10 alpha-olefin-derived units may be propylene-derived units. The dispersants may be made from copolymers having low metal and/or fluorine contents.

In a method for preparing glyoxylated polyacrylamide, in which an aqueous solution of polyacrylamide is supplemented with ethanedial (glyoxal) under stirring by means of a circulation pump, the reaction is started by the addition of a base, at a basic pH value above 8, and is allowed to react under stirring and/or circulating, whereupon the reaction is stopped by the addition of an acid under stirring and/or circulating after completion of a predetermined reaction time, wherein the method is per as a discontinuous method in which the quantitative reaction of ethanedial with an excess amount of polyacrylamide in an aqueous basic medium is controlled and/or regulated by at least one, of the following factors: a) turbidity measurement b) adaptation as a function of the temperature c) pH adaptation as a function of the reaction time d) drop of pH the value, or e) current consumption of the circulation pump.

In a method for preparing glyoxylated polyacrylamide, in which an aqueous solution of polyacrylamide is supplemented with ethanedial (glyoxal) under stirring by means of a circulation pump, the reaction is started by the addition of a base, at a basic pH value above 8, and is allowed to react under stirring and/or circulating, whereupon the reaction is stopped by the addition of an acid under stirring and/or circulating after completion of a predetermined reaction time, wherein the method is per as a discontinuous method in which the quantitative reaction of ethanedial with an excess amount of polyacrylamide in an aqueous basic medium is controlled and/or regulated by at least one, of the following factors: a) turbidity measurement b) adaptation as a function of the temperature c) pH adaptation as a function of the reaction time d) drop of pH the value, or e) current consumption of the circulation pump.