Disclosed herein are compositions including between 20 wt % and 50 wt % of a nitroxyl compound such as 2,2,6,6-tetramethylpiperidinyl-1-oxyl. The compositions are stable under field conditions of transportation and storage. The compositions remain homogeneous and pumpable or pourable at temperatures between 20 C. and 60 C., even when temperatures fluctuate in this range over a period of 10 days to 5 years, and even where the container used to transport and store the composition is made from metal or includes a metal surface contacting the composition.

Disclosed herein are compositions including between 20 wt % and 50 wt % of a nitroxyl compound such as 2,2,6,6-tetramethylpiperidinyl-1-oxyl. The compositions are stable under field conditions of transportation and storage. The compositions remain homogeneous and pumpable or pourable at temperatures between 20 C. and 60 C., even when temperatures fluctuate in this range over a period of 10 days to 5 years, and even where the container used to transport and store the composition is made from metal or includes a metal surface contacting the composition.

Polymerization inhibitor compositions are provided. The polymerization inhibitor compositions may include at least one hydroxylamine of a nitroxide and at least one phenylenediamine. Methods of inhibiting the unwanted polymerization of monomers are also provided. The methods include adding the presently disclosed polymerization inhibitor compositions to a fluid containing the monomers. The monomers may be ethylenically unsaturated monomers, such as acrylic acid, methacrylic acid, acrylonitrile, methacrylonitrile, acrolein, methacrolein, acrylate, methacrylate, acrylamide, methacrylamide, vinyl acetate, butadiene, ethylene, propylene, and styrene.

Polymerization inhibitor compositions are provided. The polymerization inhibitor compositions may include at least one hydroxylamine of a nitroxide and at least one phenylenediamine. Methods of inhibiting the unwanted polymerization of monomers are also provided. The methods include adding the presently disclosed polymerization inhibitor compositions to a fluid containing the monomers. The monomers may be ethylenically unsaturated monomers, such as acrylic acid, methacrylic acid, acrylonitrile, methacrylonitrile, acrolein, methacrolein, acrylate, methacrylate, acrylamide, methacrylamide, vinyl acetate, butadiene, ethylene, propylene, and styrene.

Polymerization inhibitor compositions are provided. The polymerization inhibitor compositions may include at least one hydroxylamine of a nitroxide and at least one phenylenediamine. Methods of inhibiting the unwanted polymerization of monomers are also provided. The methods include adding the presently disclosed polymerization inhibitor compositions to a fluid containing the monomers. The monomers may be ethylenically unsaturated monomers, such as acrylic acid, methacrylic acid, acrylonitrile, methacrylonitrile, acrolein, methacrolein, acrylate, methacrylate, acrylamide, methacrylamide, vinyl acetate, butadiene, ethylene, propylene, and styrene.

The present invention provides a method of producing an aqueous solution containing bis(N.sup.-lauroyl lysine)dicarboxylic acid diamide and/or a salt thereof, and having a pH of 9-11, which includes a first step of reacting N.sup.-lauroyl lysine and/or a salt thereof with dicarboxylic acid dichloride in a water solvent having a pH of 12-14 to form bis(N.sup.-lauroyl lysine)dicarboxylic acid diamide and/or a salt thereof, a second step of adjusting the aqueous solution obtained in the first step to pH 7.5-8.5, a third step of adding N.sup.-lauroyl lysine to the aqueous solution obtained in the second step and filtering the mixture, and a fourth step of adjusting the aqueous solution obtained in the third step to pH 9-11.

The present invention provides a method of producing an aqueous solution containing bis(N.sup.-lauroyl lysine)dicarboxylic acid diamide and/or a salt thereof, and having a pH of 9-11, which includes a first step of reacting N.sup.-lauroyl lysine and/or a salt thereof with dicarboxylic acid dichloride in a water solvent having a pH of 12-14 to form bis(N.sup.-lauroyl lysine)dicarboxylic acid diamide and/or a salt thereof, a second step of adjusting the aqueous solution obtained in the first step to pH 7.5-8.5, a third step of adding N.sup.-lauroyl lysine to the aqueous solution obtained in the second step and filtering the mixture, and a fourth step of adjusting the aqueous solution obtained in the third step to pH 9-11.

The present invention provides a method of producing an aqueous solution containing bis(N.sup.-lauroyl lysine)dicarboxylic acid diamide and/or a salt thereof, and having a pH of 9-11, which includes a first step of reacting N.sup.-lauroyl lysine and/or a salt thereof with dicarboxylic acid dichloride in a water solvent having a pH of 12-14 to form bis(N.sup.-lauroyl lysine)dicarboxylic acid diamide and/or a salt thereof, a second step of adjusting the aqueous solution obtained in the first step to pH 7.5-8.5, a third step of adding N.sup.-lauroyl lysine to the aqueous solution obtained in the second step and filtering the mixture, and a fourth step of adjusting the aqueous solution obtained in the third step to pH 9-11.

Polymerization inhibitor compositions are provided. The polymerization inhibitor compositions may include at least one hydroxylamine of a nitroxide and at least one phenylenediamine. Methods of inhibiting the unwanted polymerization of monomers are also provided. The methods include adding the presently disclosed polymerization inhibitor compositions to a fluid containing the monomers. The monomers may be ethylenically unsaturated monomers, such as acrylic acid, methacrylic acid, acrylonitrile, methacrylonitrile, acrolein, methacrolein, acrylate, methacrylate, acrylamide, methacrylamide, vinyl acetate, butadiene, ethylene, propylene, and styrene.

Polymerization inhibitor compositions are provided. The polymerization inhibitor compositions may include at least one hydroxylamine of a nitroxide and at least one phenylenediamine. Methods of inhibiting the unwanted polymerization of monomers are also provided. The methods include adding the presently disclosed polymerization inhibitor compositions to a fluid containing the monomers. The monomers may be ethylenically unsaturated monomers, such as acrylic acid, methacrylic acid, acrylonitrile, methacrylonitrile, acrolein, methacrolein, acrylate, methacrylate, acrylamide, methacrylamide, vinyl acetate, butadiene, ethylene, propylene, and styrene.