Microcapsules

Patent metadata

Field	Value
Publication number	US-9924720-B2
Application number	US-201214369033-A
Country	US
Kind code	B2
Filing date	Dec 27, 2012
Priority date	Dec 27, 2011
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

A composition is provided, comprising microcapsules, wherein said microcapsules comprise a core and an outer shell, wherein said core comprises one or more water-insoluble compound having melting point above 15° C., wherein said outer shell comprises one or more amino resin that is a reaction product of reactants comprising one or more polyamine and formaldehyde, and wherein said composition further comprises one or more formaldehyde scavenger, one or more reaction product of said amino resin with a formaldehyde scavenger, or a mixture thereof. Also provided is a method of making such a composition.

First claim

The invention claimed is:

1. A marine antifouling composition comprising microcapsules,
wherein said microcapsules comprise a core and an outer shell,
wherein said core comprises one or more water-insoluble compound having melting point above 15° C., and further wherein the core comprises 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one,
wherein said outer shell comprises one or more amino resin that is a reaction product of reactants comprising one or more polyamine, formaldehyde, and a basic reagent;
wherein said polyamine comprises urea and melamine;

and wherein said composition further comprises a formaldehyde scavenger additive
wherein the additive is urea, ethylene urea, TRIS, or mixtures thereof in an amount greater than or equal to 15%.

2. A method of making a marine antifouling composition that comprises microcapsules, said method comprising making said microcapsules and then forming a mixture of said microcapsules with one or more formaldehyde scavenger additive,
wherein said microcapsules comprise a core and an outer shell,
wherein said core comprises one or more water-insoluble compound having melting point above 15° C., and further wherein the core comprises 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one
wherein said outer shell comprises one or more amino resin that is a reaction product of reactants comprising one or more polyamine formaldehyde, and a basic reagent;
wherein said polyamine comprises urea and melamine;

and wherein said composition further comprises a formaldehyde scavenger additive

wherein the additive is urea, ethylene urea, TRIS, or mixtures thereof in an amount greater than or equal to 15%.

3. The method of claim 2 wherein said method comprises the steps of
(i) forming a dispersion of said microcapsules in water
(ii) adding said formaldehyde scavenger additive to said dispersion, and
(iii) subsequent to steps (i) and (ii), drying said dispersion of said microcapsules.

4. The method of claim 3 , wherein said drying is performed by spray drying.

Assignees

• Dow Global Technologies Llc
• Rohm & Haas

Inventors

• Tomlinson Ian A
• Wagner Nicole L
• Zeng Fanwen
• Ashmore John W
• Polanuyer Boris
• Sanders Thomas
• Laganella David

Classifications

• A01N25/10

  Macromolecular compounds · CPC title

• A01N43/80 Primary

  five-membered rings with one nitrogen atom and either one oxygen atom or one sulfur atom in positions 1,2 · CPC title

• B01J13/206

  Hardening; drying · CPC title

• B01J13/14

  Polymerisation; cross-linking · CPC title

• A01N25/28 Primary

  Microcapsules {or nanocapsules} · CPC title