Encapsulation by interfacial polycondensation

Claim 2

A process of encapsulating water-immiscible material within a shell wall of polyurea which comprises: (a) providing an aqueous phase containing an emulsifier selected from the group consisting of sodium, potassium, magnesium, calcium or ammonium salts of lignin sulfonate; (b) dispersing in said aqueous phase, a water-immiscible phase consisting essentially of polymethylene polyphenylisocyanate dissolved in said water-immiscible material, to form a dispersion of water-immiscible phase droplets throughout the aqueous phase; (c) adding, with agitation, to said dispersion a polyfunctional amine, whereby said amine reacts with polymethylene polyphenylisocyanate to form a polyurea shell wall about said water-immiscible material; wherein said water-immiscible material is selected from the group consisting of 2-chloro-2',6'-diethyl-N-(methoxymethyl)acetanilide, N-(butoxymethyl)-2-chloro-2',6'-diethylacetanilide, 2-chloro-N-isopropyl acetanilide, α-chloro-2'-ethyl-6'-methyl-N-(1-methyl-2-methoxyethyl)acetanilide, α-chloro-N-(2-methoxy-6-methylphenyl)-N-(1-methylethoxymethyl)acetamide, α-chloro-N-methyl-N-[2-methyl-6-(3-methylbutoxy) phenyl]-acetamide, α-chloro-N-[2-methyl-6-(2-methylpropoxy)phenyl]-N-(propoxymethyl)acetamide, N-[(acetylamino)methyl]-α-chloro-N-(2,6-diethylphenyl) acetamide, α-chloro-N-methyl-N-(2-methyl-6-propoxyphenyl)acetamide, N-(2-butoxy-6-methylphenyl)-α-chloro-N-methylacetamide, isobutyl ester of (2,4-dichlorophenoxy)acetic acid, 2-chloro-N-(ethoxymethyl)-6'-ethyl-o-acetatoluidide, 1-(1-cyclohexen-1-yl)-3-(2-fluorophenyl)-1-methyl urea, S-2,3,3-trichloroallyl-diisopropylthiocarbamate, S-2,3-dichloroallyl-diisopropylthiocarbamate,α,α,α-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine, 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine, 2-chloro-4,6-bis(ethylamino)-1,3,5-triazine, 2-chloro-4,6-bis(isopropylamino)-1,3,5-triazine, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one, N'-(3,4-dichlorophenyl)-N-methoxy-N-methylurea, 2-chloro-N-(ethoxymethyl)-N-[2-methyl-6-(trifluoromethyl)phenyl]acetamide, α-chloro-N-(ethoxymethyl)-N-[2-ethyl-6-(trifluoromethyl)-phenyl]acetamide, methyl and ethyl parathion, ethyl 2-chloro-4-(trifluoromethyl)-5-thiazolecarboxylate and benzyl 2-chloro-4-(trifluoromethyl)-5-thiazolecarboxylate.

Claim 3

A process as described in claim 1 wherein the concentration of said water-immiscible material is from about 480 grams to about 700 grams per liter of composition.

Claim 4

A process as described in claim 2 wherein the concentration of polymethylene polyphenylisocyanate is from about 3.5% to about 21.0% by weight of said water-immiscible material, wherein the concentration of said polyfunctional amine is from about 1.5% to about 9% by weight of said water-immiscible material and wherein the concentration of said emulsifier is from about 1/2% to about 15% by weight of said water-immiscible material.

Claim 5

A process according to claim 3 wherein the concentration of said water-immiscible material is from about 480 grams to about 600 grams per liter of composition, wherein the concentration of polymethylene polyphenylisocyanate is from about 5.0% to about 15.0% by weight of said water-immiscible material, wherein the concentration of said polyfunctional amine is from about 2.0% to about 7.5% by weight of said water-immiscible material, and wherein the concentration of said emulsifier is from about 2.0% to about 6.0% by weight of said water-immiscible material.

Claim 6

A process as described in claim 4 wherein the concentration of polymethylene polyphenylisocyanate is about 7.0% relative to the weight of said water-immiscible material, wherein the concentration of said polyfunctional amine is about 3.0% relative to the weight of said water-immiscible material and wherein the concentration of said emulsifier is about 2.0% relative to the weight of said water-immiscible material.

Claim 7

A process as described in any of claims 1 to 5 wherein said emulsifier is the sodium salt of lignin sulfonate.

Claim 8

A process as described in claim 6 wherein said amine is 1,6-hexamethylene diamine.

Claim 9

A process as described in claim 7 wherein said water-immiscible material is selected from the group consisting of α-chloro-2'-ethyl-6'-methyl-N-(1-methyl-2-methoxyethyl) acetanilide, α-chloro-N-(2-methoxy-6-methylphenyl)-N-(1-methylethoxymethyl)acetamide, α-chloro-N-(ethoxymethyl)-N-[2-methyl-6-(trifluoromethyl)phenyl)]acetamide, α-chloro-N-(ethoxymethyl)-N-[2-ethyl-6-(trifluoromethyl)phenyl]acetamide, N-[(acetylamino)methyl]-α-chloro-N-(2,6-diethylphenyl)acetamide and mixtures thereof.

Claim 10

A process as described in claim 8 wherein said water-immiscible material is α-chloro-N-(ethoxymethyl)-N-[2-methyl-6-(trifluoromethyl)phenyl]acetamide.

Claim 11

A process as described in claim 8 wherein said water-immiscible material is α-chloro-2'-ethyl-6'-methyl-N-(1-methyl-2-methoxyethyl)acetanilide.

Claim 12

A process as described in claim 8 wherein said water-immiscible material is N-[(acetylamino)-methyl]-α-chloro-N-(2,6-diethylphenyl)acetamide.

Claim 13

A process as described in claim 8 wherein said water-immiscible material is a mixture of S-2,3,3-trichloroallyl-diisopropylthiocarbamate and α,α,α-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine.

Claim 14

A process as described in claim 8 wherein said water-immiscible material is a mixture of α-chloro-2',6'-diethyl-N-methoxymethyl acetanilide and 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)one.

Claim 15

A process as described in claim 8 wherein said water-immiscible material is a mixture of α-chloro-2',6'-diethyl-N-methoxymethyl acetanilide and N'-(3,4-dichlorophenyl)-N-methoxy-N-methylurea.

Claim 16

A process as described in claim 8 wherein said water-immiscible material is a mixture of α-chloro-2',6'-diethyl-N-methoxymethyl acetanilide and 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine.

Claim 17

A process as described in claim 8 wherein said water-immiscible material is a mixture of α-chloro-N-isopropylacetanilide and 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine.

Claim 18

A process as described in claim 8 wherein said water-immiscible material is a mixture of α-chloro-N-(ethoxymethyl)-N-[2-methyl-6-(trifluoromethyl)phenyl]acetamide and 2-chloro-4-ethylamino-6-isoproplyamino-1,3,5-triazine.

Claim 19

A process as described in claim 8 wherein said water-immiscible material is a mixture of 2'-methyl-6'-ethyl-N-(1-methoxyprop-2-yl)-2-chloroacetanilide and 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine.

Claim 20

A process as described in claim 1 wherein the temperature of the reaction is maintained above the melting point of said water-immiscible material but below about 80° C.

Claim 21

A process as described in claim 1 wherein the average particle size of the microcapsules is in the range of from about 1 micron to about 50 microns in diameter.

Claim 22

A composition consisting essentially of a mixture of water and microcapsules containing a water-immiscible material, said mixture being produced by a process which comprises the steps of: (a) providing an aqueous phase containing an emulsifier selected from the group consisting of sodium, potassium, magnesium, calcium or ammonium salts of lignin sulfonate; (b) dispersing in said aqueous phase, a water-immiscible phase consisting essentially of polymethylene polyphenylisocyanate dissolved in said water-immiscible material, to form a dispersion of water-immiscible phase droplets throughout the aqueous phase; (c) adding, with agitation, to said dispersion a polyfunctional amine, whereby said amine reacts with polymethylene polyphenylisocyanate to form a polyurea shell wall about said water-immiscible material; wherein the concentration of said water-immiscible material is from about 480 grams to about 600 grams per liter of said composition, wherein the concentration of polymethylene polyphenylisocyanate is from about 3.5% to about 15.0% by weight of said water-immiscible material, wherein the concentration of said polyfunctional amine is from about 1.5% to about 9.0% by weight of said water-immiscible material, and wherein the concentration of said emulsifier is from about 1/2% to about 15% by weight of said water-immiscible material; and wherein said water-immiscible material is selected from the group consisting of 2-chloro-2',6'-diethyl-N-(methoxymethyl)acetanilide, N-(butoxymethyl)-2-chloro-2',6'-diethylacetanilide, 2-chloro-N-isopropyl acetanilide, α-chloro-2'-ethyl-6'-methyl-N-(1-methyl-2-methoxyethyl)acetanilide, α-chloro-N-(2-methoxy-6-methylphenyl)-N-(1-methylethoxymethyl)acetamide, α-chloro-N-methyl-N-[2-methyl-6-(3-methylbutoxy) phenyl]-acetamide, α-chloro-N-[2-methyl-6-(2-methylpropoxy)phenyl]-N-(propoxymethyl)acetamide, N-[(acetylamino)methyl]-α-chloro-N-(2,6-diethylphenyl) acetamide, α-chloro-N-methyl-N-(2-methyl-6-propoxyphenyl)acetamide, N-(2-butoxy-6-methylphenyl)-α-chloro-N-methylacetamide, isobutyl ester of (2,4-dichlorophenoxy)acetic acid, 2-chloro-N-(ethoxymethyl)-6'-ethyl-o-acetatoluidide, 1-(1-cyclohexen-1-yl)-3-(2-fluorophenyl)-1-methyl urea, S-2,3,3-trichloroallyl-diisopropylthiocarbamate, S-2,3-dichloroallyl-diisopropylthiocarbamate,α,α,α-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine, 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine, 2-chloro-4,6-bis(ethylamino)-1,3,5-triazine, 2-chloro-4,6-bis(isopropylamino)-1,3,5-triazine, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one, N'-(3,4-dichlorophenyl)-N-methoxy-N-methylurea, 2-chloro-N-(ethoxymethyl)-N-[2-methyl-6-(trifluoromethyl)phenyl]acetamide, α-chloro-N-(ethoxymethyl)-N-[2-ethyl-6-(trifluoromethyl)-phenyl]acetamide,methyl and ethyl parathion, ethyl 2-chloro-4-(trifluoromethyl)-5-thiazolecarboxylate, benzyl, 2-chloro-4-(trifluoromethyl)-5-thiazolecarboxylate and mixtures thereof.

Claim 23

A composition consisting essentially of a mixture of water and microcapsules containing a water-immiscible material, said mixture being produced by a process which comprises the steps of: (a) providing an aqueous phase containing an emulsifier selected from the group consisting of sodium, potassium, magnesium, calcium or ammonium salts of lignin sulfonate; (b) dispersing in said aqueous phase, a water-immiscible phase consisting essentially of polymethylene polyphenylisocyanate dissolved in said water-immiscible material, to form a dispersion of water-immiscible phase droplets throughout the aqueous phase; (c) adding, with agitation, to said dispersion a polyfunctional amine, whereby said amine reacts with polymethylene polyphenylisocyanate to form a polyurea shell wall about said water-immiscible material; wherein the concentration of said water-immiscible material is from about 480 grams to about 600 grams per liter of said composition, wherein the concentration of polymethylene polyphenylisocyanate is from about 3.5% to about 15.0% by weight of said water-immiscible material, wherein the concentration of said polyfunctional amine is from about 1.5% to about 9.0% by weight of said water-immiscible material, and wherein the concentration of said emulsifier is from about 1/2% to about 15% by weight of said water-immiscible material; and wherein said water-immiscible material is selected from the group consisting of 2-chloro-2',6'-diethyl-N-(methoxymethyl)acetanilide, N-(butoxymethyl)-2-chloro-2',6'-diethylacetanilide, 2-chloro-N-isopropyl acetanilide, α-chloro-2'-ethyl-6'-methyl-N-(1-methyl-2-methoxyethyl)acetanilide, α-chloro-N-(2-methoxy-6-methylphenyl)-N-(1-methylethoxymethyl)acetamide, α-chloro-N-methyl-N-[2-methyl-6-(3-methylbutoxy) phenyl]-acetamide, α-chloro-N-[2-methyl-6-(2-methylpropoxy)phenyl]-N-(propoxymethyl)acetamide, N-[(acetylamino)methyl]-α-chloro-N-(2,6-diethylphenyl) acetamide, α-chloro-N-methyl-N-(2-methyl-6-propoxyphenyl)acetamide, N-(2-butoxy-6-methylphenyl)-α-chloro-N-methylacetamide, isobutyl ester of (2,4-dichlorophenoxy)acetic acid, 2-chloro-N-(ethoxymethyl)-6'-ethyl-o-acetatoluidide, 1-(1-cyclohexen-1-yl)-3-(2-fluorophenyl)-1-methyl urea, S-2,3,3-trichloroallyl-diisopropylthiocarbamate, S-2,3-dichloroallyl-diisopropylthiocarbamate,α,α,α-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine, 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine, 2-chloro-4,6-bis(ethylamino)-1,3,5-triazine, 2-chloro-4,6-bis(isopropylamino)-1,3,5-triazine, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one, N'-(3,4-dichlorophenyl)-N-methoxy-N-methylurea, 2-chloro-N-(ethoxymethyl)-N-[2-methyl-6-(trifluoromethyl)phenyl]acetamide, α-chloro-N-(ethoxymethyl)-N-[2-ethyl-6-(trifluoromethyl)-phenyl]acetamide,methyl and ethyl parathion, ethyl 2-chloro-4-(trifluoromethyl)-5-thiazolecarboxylate, benzyl, 2-chloro-4-(trifluoromethyl)-5-thiazolecarboxylate and mixtures thereof.

Claim 24

A composition as described in claim 21 wherein said polyfunctional amine is 1,6-hexamethylene diamine.

Claim 25

A composition as described in claim 21 wherein said emulsifier is the sodium salt of lignin sulfonate.

Claim 26

A composition as described in claim 21 wherein the average particle size of the microcapsules is in the range of from about 1 micron to about 50 microns in diameter.

Claim 27

A composition as described in claim 21 wherein the concentration of polymethylene polyphenylisocyanate is from about 5.6% to about 13.9% relative to the weight of said water-immiscible material, wherein the concentration of said polyfunctional amine is from about 2.4% to about 6.1% relative to the weight of said water-immiscible material, and wherein the concentration of said emulsifier is from about 2.0% to about 6.0% relative to the weight of said water-immiscible material.

Claim 28

A composition as described in claim 25 wherein the concentration of polymethylene polyphenylisocyanate is about 7.0% relative to the weight of said water-immiscible material, wherein the concentration of said polyfunctional amine is about 3.0% relative to the weight of said water-immiscible material and wherein the concentration of said emulsifier is about 2% relative to the weight of said water-immiscible material.

Claim 29

A composition as described in claim 25 wherein said water-immiscible material is α-chloro-N-(ethoxymethyl)-N-[2-methyl-6-(trifluoromethyl)phenyl]acetamide.

Claim 30

A composition as described in claim 25 wherein said water-immiscible material is 2'-methyl-6'-ethyl-N-(1-methoxyprop-2-yl)-2-chloroacetanilide.

Claim 31

A composition as described in claim 25 wherein said water-immiscible material is N-[(acetylamino)-methyl]-α-chloro-N-(2,6-diethylphenyl)acetamide.

Claim 32

A composition as described in claim 25 wherein said water-immiscible material is a mixture of S-2, 3,3-trichloroallyl-diisopropylthiocarbamate and α,α,α-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine.

Claim 33

A composition as described in claim 25 wherein said water-immiscible material is a mixture of α-chloro-2',6'-diethyl-N-methoxymethyl acetanilide and 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one.

Claim 34

A composition as described in claim 25 wherein said water-immiscible material is a mixture of α-chloro-2',6'-diethyl-N-methoxymethyl acetanilide and N'-(3,4-dichlorophenyl)-N-methoxy-N-methylurea.

Claim 35

A composition as described in claim 25 wherein said water-immiscible material is a mixture of α-chloro-2',6'-diethyl-N-methoxymethyl acetanilide and 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine.

Claim 36

A composition as described in claim 25 wherein said water-immiscible material is a mixture of α-chloro-N-isopropylacetanilide and 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine.

Claim 37

A composition as described in claim 25 wherein said water-immiscible material is a mixture of α-chloro-N-(ethoxymethyl)-N-[2-methyl-6-(trifluoromethyl)-phenyl] acetamide and 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine.

Claim 38

A composition as described in claim 25 wherein said water-immiscible material is a mixture of 2'-methyl-6'-ethyl-N-(1-methoxyprop-2-yl)-2-chloro-acetanilide and 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine.

Claim 39

A composition consisting essentially of a suspension in water of microcapsules comprised of a water-immiscible material contained within an encapsulating wall of polyurea wherein: (a) the concentration of said water-immiscible material is from about 480 grams to about 600 grams per liter of total composition; (b) wherein said encapsulating wall of polyurea is the reaction product of polymethylene polyphenylisocyanate and a polyfunctional amine, wherein the concentration of polymethylene polyphenylisocyanate is from about 3.5% to about 21.0% relative to the weight of said water-immiscible material and wherein the concentration of said polyfunctional amine is from about 1.5% to about 9.0% relative to the weight of said water-immiscible material; (c) wherein said water contains from about 1/2% to about 6% of an emulsifier relative to the weight of said water immiscible material, said emulsifier being selected from the group consisting of sodium, potassium, magnesium, calcium or ammonium salts of lignin sulfonate; and wherein said water-immiscible material is selected from the group consisting of 2-chloro-2',6'-diethyl-N-(methoxymethyl)acetanilide, N-(butoxymethyl)-2-chloro-2',6'-diethylacetanilide, 2-chloro-N-isopropyl acetanilide, α-chloro-2'-ethyl-6'-methyl-N-(1-methyl-2-methoxyethyl)acetanilide, α-chloro-N-(2-methoxy-6-methylpheyl)-N-(1-methylethoxymethyl)acetamide, α-chloro-N-methyl-N-[2-methyl-6-(3-methylbutoxy) phenyl]-acetamide, α-chloro-N-[2-methyl-6-(2-methylpropoxy)phenyl]-N-(propoxymethyl)acetamide, N-[(acetylamino)methyl]-α-chloro-N-(2,6-diethylphenyl) acetamide, α-chloro-N-methyl-N-(2-methyl-6-propoxyphenyl)acetamide, N-(2-butoxy-6-methylphenyl)-α-chloro-N-methylacetamide, isobutyl ester of (2,4-dichlorophenoxy)acetic acid, 2-chloro-N-(ethoxymethyl)-6'-ethyl-o-acetatoluidide, 1-(1-cyclohexen-1-yl)-3-(2-fluorophenyl)-1-methyl urea, S-2,3,3-trichloroallyl-diisopropylthiocarbamate, S-2,3-dichloroallyl-diisopropylthiocarbamate,α,α,α-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine, 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine, 2-chloro-4,6-bis(ethylamino)-1,3,5-triazine, 2-chloro-4,6-bis(isopropylamino)-1,3,5-triazine, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one, N'-(3,4-dichlorophenyl)-N-methoxy-N-methylurea, 2-chloro-N-(ethoxymethyl)-N-[2-methyl-6-(trifluoro-methyl)phenyl]acetamide, α-chloro-N-(ethoxymethyl)-N-[2-ethyl-6-(trifluoromethyl)-phenyl]acetamide, methyl and ethyl parathion, ethyl 2-chloro-4-(trifluoromethyl)-5-thiazolecarboxylate and benzyl 2-chloro-4-(trifluoromethyl)-5-thiazolecarboxylate.

Claim 40

A composition consisting essentially of a suspension in water of microcapsules comprised of a water-immiscible material contained within an encapsulating wall of polyurea wherein: (a) the concentration of said water-immiscible material is from about 480 grams to about 600 grams per liter of total composition; (b) wherein said encapsulating wall of polyurea is the reaction product of polymethylene polyphenylisocyanate and a polyfunctional amine, wherein the concentration of polymethylene polyphenylisocyanate is from about 3.5% to about 21.0% relative to the weight of said water-immiscible material and wherein the concentration of said polyfunctional amine is from about 1.5% to about 9.0% relative to the weight of said water-immiscible material; (c) wherein said water contains from about 1/2% to about 6% of an emulsifier relative to the weight of said water immiscible material, said emulsifier being selected from the group consisting of sodium, potassium, magnesium, calcium or ammonium salts of lignin sulfonate; and wherein said water-immiscible material is selected from the group consisting of 2-chloro-2',6'-diethyl-N-(methoxymethyl)acetanilide, N-(butoxymethyl)-2-chloro-2',6'-diethylacetanilide, 2-chloro-N-isopropyl acetanilide, α-chloro-2'-ethyl-6'-methyl-N-(1-methyl-2-methoxyethyl)acetanilide, α-chloro-N-(2-methoxy-6-methylpheyl)-N-(1-methylethoxymethyl)acetamide, α-chloro-N-methyl-N-[2-methyl-6-(3-methylbutoxy) phenyl]-acetamide, α-chloro-N-[2-methyl-6-(2-methylpropoxy)phenyl]-N-(propoxymethyl)acetamide, N-[(acetylamino)methyl]-α-chloro-N-(2,6-diethylphenyl) acetamide, α-chloro-N-methyl-N-(2-methyl-6-propoxyphenyl)acetamide, N-(2-butoxy-6-methylphenyl)-α-chloro-N-methylacetamide, isobutyl ester of (2,4-dichlorophenoxy)acetic acid, 2-chloro-N-(ethoxymethyl)-6'-ethyl-o-acetatoluidide, 1-(1-cyclohexen-1-yl)-3-(2-fluorophenyl)-1-methyl urea, S-2,3,3-trichloroallyl-diisopropylthiocarbamate, S-2,3-dichloroallyl-diisopropylthiocarbamate,α,α,α-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine, 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine, 2-chloro-4,6-bis(ethylamino)-1,3,5-triazine, 2-chloro-4,6-bis(isopropylamino)-1,3,5-triazine, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one, N'-(3,4-dichlorophenyl)-N-methoxy-N-methylurea, 2-chloro-N-(ethoxymethyl)-N-[2-methyl-6-(trifluoro-methyl)phenyl]acetamide, α-chloro-N-(ethoxymethyl)-N-[2-ethyl-6-(trifluoromethyl)-phenyl]acetamide, methyl and ethyl parathion, ethyl 2-chloro-4-(trifluoromethyl)-5-thiazolecarboxylate and benzyl 2-chloro-4-(trifluoromethyl)-5-thiazolecarboxylate.

Claim 41

A composition as described in claim 37 wherein said emulsifier is the sodium salt of lignin sulfonate.

Claim 42

A composition as described in claim 38 wherein said amine is 1,6-hexamethylene diamine.

Claim 43

A composition as described in claim 37 wherein the average particle size of said microcapsules is in the range of from about 1 micron to about 50 microns in diameter.