Composition for producing N-vinyl carboxylic acid amide
A composition for producing an N-vinylcarboxylic acid amide includes (A) an N-(1-alkoxyethyl)carboxylic acid amide and (B) a carboxylic acid amide other than the N-(1-alkoxyethyl)carboxylic acid amide and the N-vinylcarboxylic acid amide, and satisfies the following conditions: (1) the composition has a melting point of 0 to 30° C.; (2) a water content is 0 to 1.00% by mass in a total amount of the composition; (3) a content ratio of the component (A) to the component (B) is 4.0 to 20.0 in terms of a molar ratio; and (4) a 5% by mass aqueous solution of the composition has a pH of 4.0 to 8.0. A method for producing an N-vinylcarboxylic acid amide includes thermally decomposing or catalytically decomposing the composition for producing an N-vinylcarboxylic acid amide.
1. A method for producing an N-vinylcarboxylic acid amide by a process which inhibits clogging of piping, comprising thermally decomposing or catalytically decomposing a composition for producing an N-vinylcarboxylic acid amide,
wherein the composition comprises:
component (A) which is an N-(1-alkoxyethyl)carboxylic acid amide; and
component (B) which is a carboxylic acid amide other than the N-(1-alkoxyethyl)carboxylic acid amide and the N-vinylcarboxylic acid amide,
wherein a content of the component (A) in a total amount of the composition is 70.0 to 92.0 mass %, and
wherein the composition satisfies the following conditions (1) to (4):
(1) the composition has a melting point of 0 to 20° C.;
(2) a water content is 0 to 1.00% by mass in a total amount of the composition;
(3) a molar ratio of the component (A) to the component (B) is 4.0:1 to 20.0:1; and
(4) when pure water is added to composition to form an aqueous solution having a concentration of the composition of 5% by mass, a pH of the aqueous solution is 4.0 to 8.0.
2. The method for producing an N-vinylcarboxylic acid amide according to claim 1 , wherein the component (A) is a compound represented by the following formula (I):
wherein R 1 represents an alkyl group having 1 to 5 carbon atoms, R 2 represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and R 3 represents an alkyl group having 1 to 5 carbon atoms.
3. The method for producing an N-vinylcarboxylic acid amide according to claim 1 , wherein the component (B) is a compound represented by the following formula (II):
wherein R 1 represents an alkyl group having 1 to 5 carbon atoms, and R 2 represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms.
4. The method for producing an N-vinylcarboxylic acid amide according to claim 1 , wherein the component (A) is an N-(1-methoxyethyl)carboxylic acid amide.
5. The method for producing an N-vinylcarboxylic acid amide according to claim 1 , wherein the component (A) is N-(1-methoxyethyl)acetamide.
6. The method for producing an N-vinylcarboxylic acid amide according to claim 1 , wherein the component (B) is acetamide.
7. The method for producing an N-vinylcarboxylic acid amide according to claim 1 , wherein when the composition is evaluated by retaining the composition under a condition of 160° C. at normal pressure in the atmosphere for 4 hours and determining a residual ratio (%) of the component (A) in the composition, the residual ratio is 70% or more.
8. The method for producing an N-vinylcarboxylic acid amide according to claim 1 , wherein a content of the component (A) in a total amount of the composition is 75.0 to 92.0% by mass.
9. The method for producing an N-vinylcarboxylic acid amide according to claim 1 , wherein a total content of the component (A) and the component (B) in a total amount of the composition is 75.0 to 99.0% by mass.