Claims
- 1. A microcapsule comprising a capsule wall enclosing hydrophobic core material produced by the process comprising emulsifying in water or in an aqueous protective colloid solution a mixture of hydrophobic core material and a water-insoluble polyamine containing at least two primary amino groups, adding a water-soluble polyisocyante bisulphite adduct in the form of a powder or and aqueous solution and allowing the mixture to react to completion at a temperature of from 1.degree. to 140.degree. C.
- 2. A microcapsule as claimed in claim 1 wherein the diameter thereof is from 0.2 to 2000 .mu.m.
- 3. A microcapsule as claimed in claim 1 wherein the wall constitutes from 5 to 64% by weight of the capsule.
- 4. A microcapsule as claimed in claim 1 wherein the core material is a water-insoluble polyamine.
- 5. A microcapsule according to claim 1 wherein the hydrophobic core material comprises a dye-precursor.
- 6. The microcapsule as claimed in claim 5 wherein the dye-precursor is selected from 3,3-bis-(p-dimethylaminophenyl)-phthalide, 4,4'-bis-dimethylaminobenzhydrilbenzyl ether, N-halogen phenyl leucolamine, N-.beta.-naphthyl leucolamine, N-2,4,5-trichlorophenyl leucolamine, N-2,4-dichlorophenyl leucolamine, rhodamine-.beta.-anilinolactam, rhodamine-.beta.-(p-nitroaniline)-lactam, rhodamine-.beta.-(p-chloroaniline)-lactam, 7-dimethylamino-2-methoxy-fluorane, 7-diethylamino-3-methoxyfluorane, 7-diethylamino-3-chloro-fluorane, 7-diethylamino-3-chloro-2-methyl-fluorane, 7-diethylamino-2,4-dimethyl-fluorane, 7-diethylamino-2,3-dimethyl-fluorane, 7-diethylamino-(3-acetylmethylamino)-fluorane, 7-diethylamino-3-methyl-fluorne, 3,7-diethylamino-fluorane, 7-diethylamino-3-(dibenzylamino)-fluroane, 7-diethylamino-3-(methylbenzylamino)-fluorane, 7-diethylamino-3-(chloroethylmethylamino)-fluorane, 7-diethylamino-3-(dichloroethylamino)-fluorane, 3,3-bis-(p-dimethylaminophenyl)-6-dimethylaminophthalide, 7-diethylamino-3-(diethylamino)-fluorane, N-benzoyl leucomethylane blue, o-chlorobenzoyl leucomethylene blue, p-nitrobenzoyl leucomethylene blue and 3methyl-2,2'-spiro-bis-(benzo(f)-chromene).
Priority Claims (2)
Number |
Date |
Country |
Kind |
3224454 |
Jun 1982 |
DEX |
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3224456 |
Jun 1982 |
DEX |
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Parent Case Info
This is a continuation of application Ser. No. 506,451, filed June 21, 1983, now U.S. Pat. No. 4,517,141, issued May 14, 1985.
US Referenced Citations (5)
Foreign Referenced Citations (2)
Number |
Date |
Country |
0023613 |
Feb 1981 |
EPX |
1103202 |
Feb 1968 |
GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
506451 |
Jun 1983 |
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