Sulfonated-ethylene oxide dispersants for use in preparing amine-formaldehyde microcapsules
US4977059A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 12, 1989 |
| Grant date | Dec 11, 1990 |
| Priority date | — |
| Expiry date | May 12, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2985
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for forming microcapsules by enwrapping an oily core material in a formaldehyde condensation product formed in situ wherein a dispersant is used of the formula (I): ##STR1## where: M is an alkali metal cation or a quaternary ammonium group, PA0 L is --(CH.sub.2).sub.p, --COO(CH.sub.2).sub.p, --C.sub.6 H.sub.4 -- or a direct bond; PA0 R, R.sup.2 and R.sup.6 are the same or different and represent a hydrogen atom or a methyl group; PA0 R.sup.1 is a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or --SO.sub.3 M where M is defined as above; R.sup.3 is --COOR.sup.4, --CONHR.sup.4, --CO--R.sup.4, a pyridinyl group or quaternary salt thereof, --COOCH.sub.2 CH.sub.2 N(CH.sub.3).sub.2 --, --COOCH.sub.2 CH.sub.2 N.sub.4 (CH.sub.3).sub.3 Cl-- group having 1 to 12 carbon atoms, an aralkyl group, an aryl group, or --(CH.sub.2).sub.m --OOC--CR.sup.2 CH.sub.2, --(OCH.sub.2 CHhd 2).sub.m COO--CR.sup.2 CH.sub.2 or --(CH.sub.2).sub.m NHCO--CR.sup.2 CH.sub.2 ; PA0 x is about 0.4 to 0.8; PA0 y is about 0.2 to 0.6; PA0 z is about 0 to 0.1; PA0 n is an integer greater than or equal to 1. PA0 m is an integer of 1 to 4; and PA0 p is an integer of 0 to 4. The compound of claim 1 wherein…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.