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US 4,960,814 AGranted
Water-dispersible polymeric compositions
AssigneeEastman Kodak Company
InventorsStephen H. W. Wu, Carol J. Greene, Mahendra K. Sharma
Life of this patent
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Abstract
Disclosed is a process for preparing polymeric compositions which are suitable for coating medicaments or for use in cosmetic formulations and the novel compositions prepared therefrom. The process makes stable, colloidal, latex-like dispersions of coating polymers which can be readily dried to form polymeric powder materials. The process makes use of a novel combination of a water-in-oil emulsifier and an oil-in-water emulsifier.
Claims33
A process for forming pseudolatices comprising:
- contacting
- (A) an organic solvent system comprising:
- (a) at least one water insoluble polymer, and
- (b) at least one low molecular weight, more volatile than water, and substantially water-immiscible organic solvent,
- with
- (B) a combination of surfactants comprising:
- (i) at least one oil-in-water emulsifier which is polymeric, water soluble or water dispersible, and nonionic, and
- (ii) at least one water-in-oil emulsifier which is water insoluble, anionic or amphoteric, more hydrophobic than said oil-in-water emulsifier, substantially dispersible in said organic solvent system, and compatible with said oil-in-water emulsifier,
- to result in an organic phase,
- wherein
- Component (A) comprises about 5 to about 35 weight % of Component (A)(a) and about 95 to about 65 weight % of Component (A)(b), based on the total weight of (A)(a) plus (A)(b);
- and Component (B)(i) is present in an amount of about 0.5% to about 70% of the weight of Component (A)(a), and Component (B)(ii) is present in an amount of about 1% to about 65% of the weight of Component (A)(a).
9 more elements
A process for forming pseudolatices comprising
- (I) Contacting
- (A) an organic solvent system comprising:
- (a) at least one water insoluble polymer, and
- (b) at least one low molecular weight, more volatile than water, and substantially water-immiscible organic solvent,
- with
- (B) at least one water-in-oil emulsifier which is water insoluble, anionic or amphoteric, and substantially dispersible in said organic solvent system,
- to result in an organic phase, and
- (II) Emulsifying said organic phase by adding sufficient water to said organic phase while subjecting the resulting mixture to a comminuting force to form a water-in-polymer solution emulsion;
- and adding to said water-in-polymer solution emulsion an additional amount of water effective to result in a phase conversion to form a polymer solution-in-water emulsion, wherein,
- said water contains at least one oil-in-water emulsifier which is polymeric, water soluble or water dispersible, nonionic, less hydrophobic than said water-in-oil emulsifier;
- and compatible with said water-in-oil emulsifier, and wherein Component (A) comprises about 5 to about 35 weight % of Component (A)(a) and about 95 to about 65 weight % of Component (A)(b), based on the total weight of (A)(a) plus (A)(b);
- and said oil-in-water emulsifier is present in an amount of about 0.5% to about 70% of the weight of Component (A)(b), and said water-in-oil emulsifier is present in an amount of about 1% to about 65% of the weight of Component (A)(a).
9 more elements
Dependencies are inferred from the claim text.