Novel emulsions
AssigneeSyngenta Limited
InventorsHerbert Benson Scher, Patrick Joseph Mulqueen, Nicholas David Green, Catherine Julia Piper
Life of this patent
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Abstract
A novel emulsion comprising a material which is stabilised by a polymer resin precursor having interface active molecules incorporated therein by reaction from poorly or non-surface active materials is disclosed. The process for producing such emulsions is likewise disclosed.
Claims17
An emulsion comprising a dispersed phase droplet having a surfactant layer at the interface with the continuous phase wherein said surfactant layer is formed by the reaction of the wall-forming moieties of a microcapsule wall-forming material with a interface modifying compound selected from compounds having a formula (I), (II), (III) (IV) or (V)
- X-z (I) X-z-X (II) 17 X—X-z (IV) 18
- wherein Z is a moiety that contributes to modifying the surface properties of said emulsion and each X is, independently, a functional moiety capable of reacting with the wall-forming moieties of a wall-forming material and the moieties designated by lines linking the X and Z functional groups have a molecular weight of between 50 and 4000, and may be optionally substituted aryl, hydrocarbyl, or heterocyclic units, or combinations thereof, optionally containing internally linked amino, ether, thioether, acetal, ester, thioester, amide, sulphonamide, urethane, urea, carbonate, siloxane, or phosphonamide groups or combinations thereof and wherein substantially all of the wall-forming moieties of the wall-forming material are reacted with one or more groups —X of the interface modifying compound such that little or no wall-forming functionality remains after reaction.
An emulsion according to any of the preceding claims wherein the interface modifying compound of structure (I) has the formula
- X—Y1-Z (IA)
- wherein Y1 represents the moiety linking X and Z and is a straight or branched chain alkyl linking group containing from 1 to 20 carbon atoms;
- or is phenyl, naphthyl, cyclopentyl or cyclohexyl;
- or
- or wherein when Z is an oxyethylene containing polymer and Y1 represents a direct link between X and Z the interface modifying compound of structure (I) has the formula structure (IB)
- R4—O(PO)r(EO)s-X (IB)
- wherein R4 is an end-capping group which is C1 to C4 alkyl, r, and s are independently from 0 to 3000, provided that s is not 0 and the total of r+s is from about 7 to about 3000 and EO and PO represent oxyethylene and oxypropylene respectively which may be arranged in random or block formation;
- or
- or wherein when Z is an oxyethylene/oxypropylene block copolymer and Y1 represents a direct link between X and Z the interface modifying compound of structure (I) has the formula (IC)
- R4′—O(PO)r′(EO)s′(PO)t—X (IC)
- wherein R4′ is an end-capping group which is C1 to C4 alkyl, r′, s′ and t are independently from 0 to 2000, provided that s is not 0 and the total of r′+s′+t is from about 7 to about 3000 and EO and PO represent oxyethylene and oxypropylene respectively;
- or
- wherein when Y1 is a ring structure group, the interface modifying compound of structure (I) has the formula (ID)
- 19
- wherein X and Z are as defined previously or if X and Z are adjacent substituents capable of reacting together they may form a cyclic anhydride capable or ring-opening under the reaction conditions.
An emulsion according to any of the preceding claims wherein the wall forming material is an isocyanate wall forming material.
Dependencies are inferred from the claim text.