A powdery paper-strengthening agent comprising a branched (meth)acrylamide-based polymer (A).

The invention discloses a calcium-resistant zwitterionic polymer, a preparation method and an application thereof, and a water-based drilling fluid containing the polymer as a dispersing agent, wherein the polymer contains a structural unit A, a structural unit B and a structural unit C, and the structural unit A is at least one selected from the group consisting of structural units with a structure shown in a formula (11), a structure shown in a formula (12) and a structure shown in a formula (13); the structural unit B is a structural unit with a structure shown in a formula (2); the structural unit C is at least one selected from the group consisting of structural units having a structure represented by formula (31) and a structure represented by formula (32); the weight-average molecular weight of the polymer is 350,000 to 600,000. ##STR00001##

The invention discloses a calcium-resistant zwitterionic polymer, a preparation method and an application thereof, and a water-based drilling fluid containing the polymer as a dispersing agent, wherein the polymer contains a structural unit A, a structural unit B and a structural unit C, and the structural unit A is at least one selected from the group consisting of structural units with a structure shown in a formula (11), a structure shown in a formula (12) and a structure shown in a formula (13); the structural unit B is a structural unit with a structure shown in a formula (2); the structural unit C is at least one selected from the group consisting of structural units having a structure represented by formula (31) and a structure represented by formula (32); the weight-average molecular weight of the polymer is 350,000 to 600,000. ##STR00001##

A polymer composition, methods and a use thereof are disclosed herein. The polymer composition having excellent self-assembly properties and capable of forming a vertical orientation structure even on a surface that no neutral treatment is performed, where the vertically oriented self-assembled structure can be effectively formed in a short time.

A polymer composition, methods and a use thereof are disclosed herein. The polymer composition having excellent self-assembly properties and capable of forming a vertical orientation structure even on a surface that no neutral treatment is performed, where the vertically oriented self-assembled structure can be effectively formed in a short time.

A resist composition contains a polymer-bound acid generator, specifically a polymer comprising recurring units derived from a sulfonium or iodonium salt having a polymerizable unsaturated bond and containing iodine in the linker between the polymerizable unsaturated bond and a fluorosulfonic acid. The resist composition offers a high sensitivity and improved CDU independent of whether it is of positive or negative tone.

Methods and compositions for inhibiting carbonyl-based fouling of basic wash systems. The methods comprise contacting the hydrocarbon stream that is or will be subjected to such washing with water soluble or water dispersible copolymers comprising repeat units of 1) ethylenically unsaturated monomers such as acrylic acid with one or more 2) other repeat units such as alkyl acrylates, allyl ethers, ethoxylated allyl repeat units, etc. In other embodiments, a third repeat unit 3) is present and may comprise a hydrophobic moiety such as a styrene repeat unit. The compositions may be terpolymers comprising repeat units 1), 2), and 3).

Methods and compositions for inhibiting carbonyl-based fouling of basic wash systems. The methods comprise contacting the hydrocarbon stream that is or will be subjected to such washing with water soluble or water dispersible copolymers comprising repeat units of 1) ethylenically unsaturated monomers such as acrylic acid with one or more 2) other repeat units such as alkyl acrylates, allyl ethers, ethoxylated allyl repeat units, etc. In other embodiments, a third repeat unit 3) is present and may comprise a hydrophobic moiety such as a styrene repeat unit. The compositions may be terpolymers comprising repeat units 1), 2), and 3).

Water-soluble copolymers based on a) 50 to 97% by weight of one or more non-ionic, ethylenically unsaturated monomers containing amide groups, b) 0.1 to 10% by weight of one or more ethylenically unsaturated monomers containing silane groups c) 1 to 30% by weight of one or more ionic, ethylenically unsaturated monomers and optionally one or more further ethylenically unsaturated monomers, are useful as protective colloids for inorganic particle and water-insoluble polymer particle dispersions. wherein the figures in % by weight add up to 100% by weight.

Water-soluble copolymers based on a) 50 to 97% by weight of one or more non-ionic, ethylenically unsaturated monomers containing amide groups, b) 0.1 to 10% by weight of one or more ethylenically unsaturated monomers containing silane groups c) 1 to 30% by weight of one or more ionic, ethylenically unsaturated monomers and optionally one or more further ethylenically unsaturated monomers, are useful as protective colloids for inorganic particle and water-insoluble polymer particle dispersions. wherein the figures in % by weight add up to 100% by weight.