Detail of "29512-49-0"

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Microcapsules having walls of urea- or melamine-formaldehyde polymeric materials

Microcapsules having walls of urea- or melamine-formaldehyde polymeric materials. Brown, Robert W.; Bowman, Richard P. (Appleton Papers, Inc., USA). Eur. Pat. Appl. EP 133352 A2 20 Feb 1985, 24 pp. DESIGNATED STATES: R: AT, BE, CH, DE, FR, GB, IT, LI, NL, SE. (English). (European Patent Organization). CODEN: EPXXDW. CLASS: ICM: B01J013-02. ICS: B41M005-00. APPLICATION: EP 84-305001 24 Jul 1984. PRIORITY: US 83-517296 26 Jul 1983; US 84-619967 12 Jun 1984. DOCUMENT TYPE: Patent CA Section: 38 (Plastics Fabrication and Uses) Microcapsules useful in pressure-sensitive copying materials are prepd. by in situ polymn. of an aminoplast precursor material in an aq. medium in the presence of an acrylic acid-alkyl acrylate copolymer contg. a crit. proportion of alkyl acrylate. Thus, into 153 g of a mixt. of 149.5 g H2O and 3.5 g acrylic acid-Et acrylate copolymer [25085-35-2] (contg. 24% Et acrylate), adjusted to pH 5.0, was emulsified 180 g of capsule core material soln. contg. 3,3-bis(p-dimethylaminophenyl)-6-dimethylaminophthalide [1552-42-7] 1.7, 2'-anilino-3'-methyl-6'-diethylaminofluoran [29512-49-0] 0.55, and 3,3-bis(1-ethyl-2-methylindol-3-yl) phthalide [22091-92-5] 0.55% in a mixt. of C10-13 alkylbenzene and benzylated xylenes. A 2nd mixt. of 6.5 g of the corresponding copolymer and 65.0 g H2O was prepd. and adjusted to pH 4.0, and 20 g Resimene 714 [9003-08-1] was added, and this mixt. was added with stirring to the above emulsion. The mixt. was heated overnight at 55° to initiate and complete encapsulation with an acceptable emulsion. The emulsion (50 parts) was mixed with 5 parts ethoxylated cornstarch binder and 12.5 parts uncooked wheat starch granules on a dry basis and dild. with H2O to a 20% solids dispersion which was coated on a 50 g/m2 paper base. The paper had typewriter intensity of 53 before oven storage (100° for 16 h) and 54 after oven storage.

Minute capsules

Minute capsules. Brown, Robert W.; Bowman, Richard P. (Appleton Papers, Inc., USA). Eur. Pat. Appl. EP 117605 A1 5 Sep 1984, 25 pp. DESIGNATED STATES: R: AT, BE, CH, DE, FR, GB, IT, LI, LU, NL, SE. (English). (European Patent Organization). CODEN: EPXXDW. CLASS: IC: B01J013-02; B41M005-00. APPLICATION: EP 84-300195 13 Jan 1984. PRIORITY: US 83-460704 24 Jan 1983. DOCUMENT TYPE: Patent CA Section: 38 (Plastics Fabrication and Uses) Microencapsulated chromogenic materials for use in pressure-sensitive copying materials are prepd. by establishing a dispersion of particles or droplets of the insol. chromogenic nucleus material in an aq. vehicle contg. an aminoplast capsule wall precursor and a mixt. of poly(acrylic acid) (I) [9003-01-4] and poly(styrenesulfonic acid) (II) [50851-57-5] or its salt and forming polymeric shells individually surrounding the particle from the capsule wall precursor by in situ polymn. Thus, a soln. contg. I 28, II 10, and water 212 g was adjusted to pH 4.0 with 20% NaOH soln. Into 200 g of the soln. was emulsified 180 g of a chromogenic compd. soln. contg. 3,3-bis(p-dimethylaminophenyl)-6-dimethylaminophthalide [1552-42-7] 1.7, 2'-anilino-3'-methyl-6'-diethylaminofluoran [29512-49-0] 0.55, and 3,3-bis(1-ethyl-2-methylindol-3-yl)phthalide [22091-92-5] 0.55% in a solvent mixt. of 65 parts C10-13 alkylbenzene and 35 parts benzylated xylenes to give a drop size range of ￡15M. To the remaining portion of the I-II soln. was added 25 g partially methylated methylolmelamine resin, i.e. Resimene 714 [9003-08-1], and this mixt. was added to the above emulsion. The mixt. was heated 2 h at 65° to complete encapsulation.