Provided is a method for preparing a polyamide by an anionic polymerization reaction, wherein lactam, and based on 100 parts by weight of the entire lactam, 0.01 parts by weight to 20 parts by weight of an alkali metal as an initiator, 0.3 parts by weight to 10 parts by weight of a molecular weight controller, and 0.002 parts by weight to 1.0 part by weight of carbon dioxide as an activator may be included.

Provided is a method for preparing a polyamide by an anionic polymerization reaction, wherein lactam, and based on 100 parts by weight of the entire lactam, 0.01 parts by weight to 20 parts by weight of an alkali metal as an initiator, 0.3 parts by weight to 10 parts by weight of a molecular weight controller, and 0.002 parts by weight to 1.0 part by weight of carbon dioxide as an activator may be included.

Compatibilizing agents for use in a wide variety of filled and unfilled liquid matrices and compositions comprising the agents are described. The compatibilizing agents can reduce the viscosity of the matrices and/or improve the stability of the matrices. Exemplary compatibilizing agents include one or more aryl sulfonyl derivatives, such as aryl sufonyl urethanes, aryl sulfonyl ureas, and aryl sulfonamides.

Compatibilizing agents for use in a wide variety of filled and unfilled liquid matrices and compositions comprising the agents are described. The compatibilizing agents can reduce the viscosity of the matrices and/or improve the stability of the matrices. Exemplary compatibilizing agents include one or more aryl sulfonyl derivatives, such as aryl sufonyl urethanes, aryl sulfonyl ureas, and aryl sulfonamides.

Disclosed is an aqueous coating agent comprising: (A) a copolymer of ethylene with a carboxylic acid derivative having an ethylenic double bond; (B) a basic material; and (C) particles having melting point of 100 C. or more, and is further a paper substrate coated with the aqueous coating agent.

Disclosed is an aqueous coating agent comprising: (A) a copolymer of ethylene with a carboxylic acid derivative having an ethylenic double bond; (B) a basic material; and (C) particles having melting point of 100 C. or more, and is further a paper substrate coated with the aqueous coating agent.