Friable shell microcapsules, process for preparing the same and method of use thereof
AssigneeISP Investments Inc.
InventorsKumar Kishor MISTRY, Assim FIAZ, Abdul Wahab HUSSAIN, Terry CRUTCHER
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Abstract
The present application describes a microcapsule comprising: (i) a lipophilic core material, and (ii) a microcapsule shell, wherein microcapsule shell formed from oil-in-water emulsion polymerisation of monomer mixture consisting essentially of: (a) greater than 70 to about 99% by weight of at least one polyfunctional ethylenically unsaturated monomer, (b) about 1 to about 30% by weight of at least one unsaturated carboxylic acid monomer or its ester, and (c) about 0 to about 30% by weight of at least one vinyl monomer. Also provides process for preparing the same and its method of use in various applications.
Claims21
A microcapsule comprising:
- i. a lipophilic core material, and
- ii. a microcapsule shell;
- wherein said microcapsule shell is formed from oil-in-water emulsion polymerisation of a monomer mixture consisting essentially of:
- (a) greater than 70 to about 99% by weight of at least one polyfunctional ethylenically unsaturated monomer, (b) about 1 to about 30% by weight of at least one unsaturated carboxylic acid monomer or its ester, and (c) about 0 to about 30% by weight of at least one vinyl monomer.
A process for preparing microcapsules comprising the steps of:
- A. preparing an oil phase comprising:
- i. a monomer mixture consisting essentially of:
- (a) greater than 70 to about 99% by weight of at least one polyfunctional ethylenically unsaturated monomer, (b) about 1 to about 30% by weight of at least one unsaturated carboxylic acid monomer or its ester, and (c) about 0 to about 30% by weight of at least one vinyl monomer;
- and
- ii. at least one lipophilic core material;
- B. preparing a separate aqueous phase comprising at least one polymeric emulsion stabilizer and water;
- C. adding the oil phase of step (A) to the aqueous phase of step (B) under mechanical shear to form an oil-in-water emulsion;
- D. polymerizing the oil-in-water emulsion of step (C) through radical polymerisation employing at least one initiator to produce core-shell microcapsules comprising an entrapped lipophilic core material and a polymer shell to result in a suspension of core-shell microcapsules in water.
A consumer care composition comprising a microcapsule comprising:
- (i) a lipophilic core material, and (ii) a microcapsule shell, wherein said microcapsule shell is formed from oil-in-water emulsion polymerisation of a monomer mixture consisting essentially of:
- (a) greater than 70 to about 99% by weight of at least one polyfunctional ethylenically unsaturated monomer, (b) about 1 to about 30% by weight of at least one unsaturated carboxylic acid monomer or its ester, and (c) about 0 to about 30% by weight of at least one vinyl monomer.
A method of use of a microcapsule comprising employing said microcapsule as a delivery matrix to deliver lipophilic core materials for industrial compositions that are related to agrochemicals, textiles, paper, mining, oil industry, water treatment, adhesives, coatings, plastics, sealants, construction, paints, inks and dyes onto different substrate surfaces such as skin, hair, or textiles, and wherein said microcapsule comprises:
- (i) at least one lipophilic core material, and (ii) a microcapsule shell, wherein said microcapsule shell is formed from oil-in -water emulsion polymerisation of a monomer mixture consisting essentially of:
- (a) greater than 70 to about 99% by weight of at least one polyfunctional ethylenically unsaturated monomer, (b) about 1 to about 30% by weight of at least one unsaturated carboxylic acid monomer or its ester, and (c) about 0 to about 30% by weight of at least one vinyl monomer.
Dependencies are inferred from the claim text.