Benefit delivery particle, process for preparing said particle, compositions comprising said particles and a method for treating substrates

Patent metadata

Field	Value
Publication number	US-9993401-B2
Application number	US-201414482545-A
Country	US
Kind code	B2
Filing date	Sep 10, 2014
Priority date	Jul 15, 2010
Publication date	Jun 12, 2018
Grant date	Jun 12, 2018

Abstract

The invention provides a benefit agent delivery particle having an average diameter of less than 50 micron comprising; at least one shell formed by a step-growth polymerization reaction, preferably involving an isocyanate monomer, more preferably a urethane and/or a urea. interior said shell, at least one region formed by chain-growth polymerization reaction (preferably a free-radical polymerization) which does not involve an isocyanate, c) optionally, a benefit agent interior to said shell, and/or a deposition aid exterior to said shell. The invention further provides a process for the preparation of such particles wherein the shell is formed prior to the chain-growth polymerization of the at least one region interior of the shell, preferably be forming the shell at a temperature at which the chain-growth reaction is inhibited. The invention further provides fully formulated products, preferably liquids and gels, which contain said benefit agent delivery particles and a method of treating substrates using said products.

First claim

The invention claimed is:

1. A method of forming a particle comprising:
a) reacting at least one step-growth monomer and at least one first cross-linking agent in a step-growth polymerization reaction to form at least one shell of the particle, wherein the first cross-linking agent is 2-35 mol % of the step-growth monomer; and
b) after step a), reacting at least one chain-growth monomer, at least one second cross-linking agent in a chain-growth polymerisation reaction to form an inner region of the particle, wherein the chain-growth polymerisation reaction does not involve an isocyanate,
(i) wherein the at least one second cross-linking agent is 0.0001-25 mol % of the at least one chain-growth monomer,
(ii) wherein the particle has an average diameter of less than 500 nm;
(iii) wherein the particle has a perfume in the inner region of the particle;
(iv) wherein the particle has a deposition aid exterior of the at least one shell of the particle, and
(v) wherein the particle is configured to adsorb over 60% of the perfume into the particle after one day.

2. The method according to claim 1 , wherein the step-growth polymerisation reaction is not condensation polymerisation.

3. The method according to claim 1 , wherein the chain-growth polymerisation reaction is a radical polymerisation reaction.

4. The method according to claim 1 , further comprising: decorating a surface of the particle with a deposition aid comprising a polysaccharide;
wherein the deposition aid is substantive to proteinaceous, cellulosic, polyester or polyamide surfaces.

5. The method according to claim 1 , wherein the benefit agent comprises a hydrophobic benefit agent.

6. A method comprising;
a) providing an emulsion having a mean dispersed particle size diameter of less than 500 nm and having
(1) a dispersed non-aqueous phase comprising:
i) a first co-monomer, capable of step-growth polymerization with a suitable second co-monomer;
(ii) a first cross-linking agent that is 2-35 mol % of the first co-monomer;
iii) a benefit agent, wherein the non-aqueous phase is configured to adsorb over 60% of an amount of the benefit agent after one day;
iv) at least one monomer capable of chain-growth polymerization;
(v) a second cross-linking agent that is 0.0001-25 mol % of the at least one monomer; and,
vi) a radical initiator which is not significantly active at the temperature at which the first and second co-monomer undergoes step-growth polymerization;

(2) and, a continuous aqueous phase comprising:
i) water,
ii) emulsifying agent,
iii) a second co-monomer

b) maintaining the emulsion at a temperature at which the step-growth polymerisation occurs but not the chain growth polymerisation,
c) maintaining the emulsion at a temperature at which the chain-growth polymerisation proceeds, and
d) adding a deposition aid after step (c).

7. The method according to claim 6 , wherein the at least one monomer capable of chain growth polymerisation comprises an ethylenically unsaturated vinyllic monomer.

8. The method according to claim 1 , wherein the particle further comprises at least one cross-linking agent, derived from at least one of:
i) a more than di-functional agent having isocyanate, alcohol, or amine functionality, or
ii) a more than mono-functional vinyllic monomer.

9. The method of claim 1 further comprising:
forming a plurality of particles according to steps a) and b):
dispersing the plurality of particles in a composition;
wherein the composition is at least one of a laundry detergent, laundry conditioner, deodorant, antiperspirant, shampoo, hair conditioner or skin care or skin cleansing product.

10. The method of preparing the composition according to claim 9 , wherein the particles and the benefit agent are added separately so as to result in the particles taking up the benefit agent in the composition.

11. The method of claim 2 , wherein the step-growth polymerisation reaction involves an isocyanate monomer.

12. The method of claim 2 , wherein the step-growth polymerisation reaction involves at least one of urethane or urea.

13. The method of claim 3 , wherein the radical polymerisation reaction of at least one ethylenically unsaturated vinyllic monomer.

14. The method of claim 3 , wherein the radical polymerisation reaction of at least one of acrylate or methacryate.

15. The method of claim 5 , wherein the hydrophobic benefit agent comprises an organoleptic benefit agent.

16. The method of claim 5 , wherein the hydrophobic benefit agent comprises a flavour or fragrance.

17. The method of claim 6 , wherein the first co-monomer is an isocyanate; the benefit agent is an organoleptic benefit agent; and the radical initiator is at least one of peroxide or azo-.

18. The method of claim 6 , wherein the second co-monomer is:
at least one of diol or diamine and
capable of forming a polyurethane or polyuria on reaction with the first comonomer.

19. The method of claim 7 , wherein the at least one monomer is at least one of acrylate or methacryate.

Assignees

• Conopco Inc

Inventors

• Barnett Stuart Anthony
• Jones Craig Warren
• Limer Adam John
• Merrington James
• Winter Jeremy Nicholas

Classifications

• A23P10/30

  Encapsulation of particles, e.g. foodstuff additives · CPC title

• A61K2800/56

  Compounds, absorbed onto or entrapped into a solid carrier, e.g. encapsulated perfumes, inclusion compounds, sustained release forms · CPC title

• A61K8/8152

  Homopolymers or copolymers of esters, e.g. (meth)acrylic acid esters; Compositions of derivatives of such polymers · CPC title

• A61Q15/00

  Anti-perspirants or body deodorants (deodorisation of air A61L9/00) · CPC title

• C11D17/0039

  Coated compositions or coated components in the compositions, (micro)capsules · CPC title