Polymeric dispersants are disclosed that include an acrylic backbone at least one pendantly attached imide group, wherein the carbonyl of the imide are chemically bonded to a fused aromatic ring. The aromatic ring can be substituted with various electron withdrawing or releasing groups. Desirably dispersant also includes solvent-solubilising chains of polyether, polyester, polyacrylate, and or polyolefin.

In a method for producing a (meth)acrylamide polymer papermaking additive obtaining a (meth)acrylamide polymer by obtaining a first polymer by polymerizing a first polymerization component containing a (meth)acrylamide and polymerizing a second polymerization component containing a tertiary amino monomer under the presence of the first polymer, the first polymerization component and/or the second polymerization component contain(s) a (meth)allyl sulfonate, a ratio of the tertiary amino monomer in the first polymerization component with respect to 100 mol of the (meth)acrylamide in the first polymerization component is 0.1 mol or less, and a ratio of the (meth)acrylamide in the second polymerization component with respect to 100 mol of the tertiary amino monomer in the second polymerization component is 1.0 mol or less.

In a method for producing a (meth)acrylamide polymer papermaking additive obtaining a (meth)acrylamide polymer by obtaining a first polymer by polymerizing a first polymerization component containing a (meth)acrylamide and polymerizing a second polymerization component containing a tertiary amino monomer under the presence of the first polymer, the first polymerization component and/or the second polymerization component contain(s) a (meth)allyl sulfonate, a ratio of the tertiary amino monomer in the first polymerization component with respect to 100 mol of the (meth)acrylamide in the first polymerization component is 0.1 mol or less, and a ratio of the (meth)acrylamide in the second polymerization component with respect to 100 mol of the tertiary amino monomer in the second polymerization component is 1.0 mol or less.

The resin composition of the present invention comprises a prepolymer (P) and a thermosetting component, the prepolymer (P) being obtained by polymerizing an alkenyl-substituted nadimide (A), a maleimide compound (B), and an amino-modified silicone (C).

The resin composition of the present invention comprises a prepolymer (P) and a thermosetting component, the prepolymer (P) being obtained by polymerizing an alkenyl-substituted nadimide (A), a maleimide compound (B), and an amino-modified silicone (C).

The resin composition of the present invention comprises a prepolymer (P) and a thermosetting component, the prepolymer (P) being obtained by polymerizing an alkenyl-substituted nadimide (A), a maleimide compound (B), and an amino-modified silicone (C).

In a method for producing a (meth)acrylamide polymer papermaking additive obtaining a (meth)acrylamide polymer by obtaining a first polymer by polymerizing a first polymerization component containing a (meth)acrylamide and polymerizing a second polymerization component containing a tertiary amino monomer under the presence of the first polymer, the first polymerization component and/or the second polymerization component contain(s) a (meth)allyl sulfonate, a ratio of the tertiary amino monomer in the first polymerization component with respect to 100 mol of the (meth)acrylamide in the first polymerization component is 0.1 mol or less, and a ratio of the (meth)acrylamide in the second polymerization component with respect to 100 mol of the tertiary amino monomer in the second polymerization component is 1.0 mol or less.

In a method for producing a (meth)acrylamide polymer papermaking additive obtaining a (meth)acrylamide polymer by obtaining a first polymer by polymerizing a first polymerization component containing a (meth)acrylamide and polymerizing a second polymerization component containing a tertiary amino monomer under the presence of the first polymer, the first polymerization component and/or the second polymerization component contain(s) a (meth)allyl sulfonate, a ratio of the tertiary amino monomer in the first polymerization component with respect to 100 mol of the (meth)acrylamide in the first polymerization component is 0.1 mol or less, and a ratio of the (meth)acrylamide in the second polymerization component with respect to 100 mol of the tertiary amino monomer in the second polymerization component is 1.0 mol or less.

A modified copolymer is provided. The modified copolymer includes a random copolymer of a repeat unit of formula (I) and a repeat unit of formula (II)

##STR00001##

wherein M is derived from monomers with double bonds, R is a direct bond or an aliphatic hydrocarbon chain group having 1 to 12 carbon atoms, a cyclic aliphatic hydrocarbon group having 3 to 16 carbon atoms, an alkylcarbonyloxy group having 2 to 6 carbon atoms, a carbonyl group, an ether group, an ester group, an amide group, an aromatic group having 6 to 16 carbon atoms, or a divalent group having any of the above groups, wherein m and x are positive integers less than 50. The weight average molecular weight of the modified copolymer is between 3000 and 30000.

A modified copolymer is provided. The modified copolymer includes a random copolymer of a repeat unit of formula (I) and a repeat unit of formula (II)

##STR00001##

wherein M is derived from monomers with double bonds, R is a direct bond or an aliphatic hydrocarbon chain group having 1 to 12 carbon atoms, a cyclic aliphatic hydrocarbon group having 3 to 16 carbon atoms, an alkylcarbonyloxy group having 2 to 6 carbon atoms, a carbonyl group, an ether group, an ester group, an amide group, an aromatic group having 6 to 16 carbon atoms, or a divalent group having any of the above groups, wherein m and x are positive integers less than 50. The weight average molecular weight of the modified copolymer is between 3000 and 30000.