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( methoxycarbonylmethyl )amine, N-hexy I-bis (methoxycarbonylmethyl)amine, and ~-( diethylamino )-o› valerolactone. 

Also useful are one or more organic nitrogen-containing compounds having cyclic structure represented by the follow- ing general formula (D)-2. 

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Herein X is as defined above, and R 307 is a straight or branched C$_{2}$ -C$_{20 }$alkylene group which may contain one or more carbonyl, ether, ester or sulfide groups. 

Illustrative examples of the organic nitrogen-containing compounds having formula (D)-2 include 1-[2-(meth› oxymethoxy )ethyl]pyrrolidine, 1-[2-(methoxymethoxy) ethyl]piperidine, 4-[2-(methoxymethoxy)ethyl]morpholine, 1-[2-[ (2-methoxyethoxy )methoxy ]ethyl]pyrrolidine, 1-[2- [ (2-methoxyethoxy )methoxy ]ethyl]piperidine, 4-[2-[(2- methoxyethoxy )methoxy ]ethyl]morpholine, 2-(1-pyrrolidi› nyl)ethyl acetate, 2-piperidinoethyl acetate, 2-morpholinoethyl acetate, 2-(1-pyrrolidinyl)ethyl formate, 2-piperidinoethyl propionate, 2-morpholinoethyl acetoxyac› etate, 2-(1-pyrrolidinyl)ethyl methoxyacetate, 4-[2-(meth› oxycarbony loxy )ethyl ]morpholine, 1-[2-( t-butoxycarbony› loxy )ethyl ]piperidine, 4-[2-(2-methoxyethoxycarbonyloxy) ethyl ]morpholine, methy I 3-(1-pyrrolidiny I )propionate, methyl 3-piperidinopropionate, methyl 3-morpholinopropi› onate, methyl 3-(thiomorpholino )propionate, methyl 2-me› thyl-3-(1-pyrrolidinyl)propionate, ethyl 3-morpholinopropi› onate, methoxycarbonylmethyl 3-piperidinopropionate, 2-hydroxyethyl 3-(1-pyrrolidinyl)propionate, 2-acetoxy› ethyl 3-morpholinopropionate, 2-oxotetrahydrofuran-3-yl 3-( 1-pyrrolidinyl )propionate, tetrahydrofurfury I 3-morpholi› nopropionate, glycidyl 3-piperidinopropionate, 2-methoxy› ethyl 3-morpholinopropionate, 2-(2-methoxyethoxy)ethyl 3-( 1-pyrrolidinyl )propionate, buty 13-morpholinopropionate, cyclohexy I 3-piperidinopropionate, a-( 1-pyrrolidinyl )me› thy 1-y-butyrolactone, ~-piperidino-y-butyrolactone, ~-mor› pholino-o-valerolactone, methyl 1-pyrrolidinylacetate, methyl piperidinoacetate, methyl morpholinoacetate, methyl thiomorpholinoacetate, ethyl 1-pyrrolidinylacetate, 2-meth› oxyethyl morpholinoacetate, 2-morpholinoethyl 2-methoxy› acetate, 2-morpholinoethyl 2-(2-methoxyethoxy)acetate, 2-morphol)noethy I 2-[2-(2-methoxyethoxy )ethoxy ]acetate, 2-morpholmoethyl hexanoate, 2-morpholinoethyl octanoate, 2-morpholinoethyl decanoate, 2-morpholinoethyl laurate, 2-morpholinoethyl myristate, 2-morpholinoethyl palmitate, and 2-morpholinoethyl stearate. 

Also, one or more organic nitrogen-containing compounds having cyano group represented by the following general formulae (D)-3 to (D)-6 may be blended. 

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Herein, X, R$^{307 }$and n are as defined above, and R$^{308 }$and R 309 are each independently a straight or branched C$_{1 }$-C$_{4 }$ alkylene group. 

Illustrative examples of the organic nitrogen-containing compounds having cyano represented by formulae (D)-3 to (D)-6 include 3-( diethylamino )propiononitrile, N,N-bis(2- hydroxyethyl)-3-aminopropiononitrile, N,N-bis(2-acetoxy› ethyl)-3-aminopropiononitrile, N,N-bis(2-formyloxyethyl)- 3-aminopropiononitrile, N,N-bis(2-methoxyethyl)-3- aminopropiononitrile, N,N-bis[2-(methoxymethoxy )ethyl]- 3-aminopropiononitrile, methyl N-(2-cyanoethyl)-N-(2- methoxyethyl)-3-aminopropionate, methyl N-(2- cyanoethyl)-N-(2-hydroxyethyl)-3-aminopropionate, methyl N-(2-acetoxyethyl)-N-(2-cyanoethyl)-3-aminopropi- onate, N-(2-cyanoethyl)-N-ethyl-3-aminopropiononitrile, N-(2-cyanoethyl)-N-(2-hydroxyethyl)-3-aminopropiononi› trile, N-(2-acetoxyethyl )-N-(2-cyanoethy 1)-3-aminopropi› ononitrile, N-(2-cyanoethy 1)-N-(2-formyloxyethy I )-3-ami- nopropiononitrile, N-(2-cyanoethyl)-N-(2-methoxyethyl)-3- aminopropiononitrile, N-(2-cyanoethyl)-N-[2- (methoxymethoxy)ethyl]-3-aminopropiononitrile, N-(2- cyanoethyl)-N-(3-hydroxy-l-propyl)-3- aminopropiononitrile, N-(3-acetoxy- l-propyl)-N-(2- cyanoethyl)-3-aminopropiononitrile, N-(2-cyanoethyl)-N- (3-fanny loxy-1-propy I )-3-aminopropiononitrile, N-(2- cyano~thy l)-N-tetrahydrofurfuryl-3-aminopropiononitrile, N,N-b1s(2-cyanoethyl)-3-aminopropiononitrile, diethylami› noacet_onitrile, N,N-bis(2-hydroxyethyl)aminoacetonitrile, N,N-b1s(2-acetoxyethyl)aminoacetonitrile, N,N-bis(2- formyloxyethyl)aminoacetonitrile, N,N-bis(2-methoxy- ethyl)aminoacetonitrile, N,N-bis[2-(methoxymethoxy) ethyl]aminoacetonitrile, methyl N-cyanomethyl-N-(2- methoxyethy I )-3-aminopropionate, methy I N-cyanomethyl- N-(2-hydroxyethyl)-3-aminopropionate, methyl N-(2- acetoxyethy 1)-N-cyanomethy 1-3-aminopropionate, N-cyanomethyl-N-(2-hydroxyethyl)aminoacetonitrile, N-(2-acetoxyethy 1)-N-( cyanomethy l)aminoacetonitrile, N-cyanomethy l-N-(2-fanny loxyethy l)aminoacetonitrile, N-cyanomethyl-N-(2-methoxyethyl)aminoacetonitrile, N-cyanomethy 1-N-[2-(methoxymethoxy )ethy l)aminoaceto› nitrile, N-cyanomethyl-N-(3-hydroxy-l-propyl)aminoaceto› nitrile, N-(3-acetoxy- l-propyl)-N-( cyanomethyl)aminoac› etonitrile, N-cyanomethyl-N-(3-formyloxy-l-propyl) aminoacetonitrile, N,N-bis( cyanomethyl)aminoacetonitrile, 1-pyrrolidinepropiononitrile, 1-piperidinepropiononitrile, 4-morpholinepropiononitrile, 1-pyrrolidineacetonitrile, 1-pi› peridineacetonitrile, 4-morpholineacetonitrile, cyanomethyl 3-diethylaminopropionate, cyanomethyl N,N-bis(2-hy› droxyethyl)-3-aminopropionate, cyanomethyl N,N-bis(2-ac› etoxyethyl)-3-aminopropionate, cyanomethyl N,N-bis(2- formyloxyethy I )-3-aminopropionate, cyanomethy I N,N-bis (2-methoxyethyl)-3-aminopropionate, cyanomethyl N,N-bis [2-(methoxymethoxy )ethy l]-3-aminopropionate, 2-cyanoethyl 3-diethylaminopropionate, 2-cyanoethyl N,N› bis(2-hydroxyethyl)-3-aminopropionate, 2-cyanoethyl N,N› bis(2-acetoxyethyl)-3-aminopropionate, 2-cyanoethyl N,N- 

