Encapsulated bleaches and methods for their preparation
First Claim
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1. A granulated active chlorine bleaching agent encapsulated with a coating comprising:
- (a) about 15 to about 25% of the total encapsulate weight of a first coating on said agent consisting essentially of a major proportion of a substantially saturated fatty acid being substantially non-reactive with said agent and having a melting point range of about 85°
F. to about 135°
F. and a plasticizing amount of a microcrystalline wax having a melting point range of about 125°
F. to about 210°
F.; and
(b) about 30% to about 40% of the total encapsulate weight of a second coating on said first coating, said second coating consisting essentially of a major proportion of a fatty acid, a sufficient amount of said microcrystalline wax to plasticize said second coating and about 5 to about 20% of the total encapsulate weight of a polyoxyethylene-polyoxypropylene copolymer having at least about 65% by weight of polyoxyethylene and having a molecular weight of about 8000 to about 16,500.
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Abstract
Bleaching compositions containing coated or encapsulated bleaching agents, methods for employing these coated agents, as well as methods for preparing these encapsulates are disclosed. These compositions and methods are utilized to effectively bleach colored fabrics and textiles in both hot and cold water with minimal pinpoint damage to the fabric colors. The encapsulates have excellent storage properties and release of the active component at both hot and cold temperatures.
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Citations
19 Claims
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1. A granulated active chlorine bleaching agent encapsulated with a coating comprising:
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(a) about 15 to about 25% of the total encapsulate weight of a first coating on said agent consisting essentially of a major proportion of a substantially saturated fatty acid being substantially non-reactive with said agent and having a melting point range of about 85°
F. to about 135°
F. and a plasticizing amount of a microcrystalline wax having a melting point range of about 125°
F. to about 210°
F.; and(b) about 30% to about 40% of the total encapsulate weight of a second coating on said first coating, said second coating consisting essentially of a major proportion of a fatty acid, a sufficient amount of said microcrystalline wax to plasticize said second coating and about 5 to about 20% of the total encapsulate weight of a polyoxyethylene-polyoxypropylene copolymer having at least about 65% by weight of polyoxyethylene and having a molecular weight of about 8000 to about 16,500. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A granulated active chlorine bleaching agent encapsulated with a coating comprising:
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(a) about 5% to about 15% of the total encapsulate weight of a first coating on said agents, said first coating consisting essentially of a major portion of a substantially saturated fatty acid being substantially non-reactive with said agents and having a melting point range of about 85% to about 135°
F. and a plasticizing amount of a microcrystalline wax having a melting point range of about 125°
F. to about 210°
F.;(b) about 25% to about 40% of the total encapsulate weight of a second coating on said first coated agents, said second coating consisting essentially of a major proportion of a fatty acid, a sufficient amount of said microcrystalline wax to plasticize said second coating and about 5 to about 20% by weight of the total encapsulated weight of a polyoxyethylene-polyoxypropylene copolymer having at least about 65% by weight of polyoxyethylene and having a molecular weight of about 8000 to about 16,500; and (c) about 5% to about 15% of the total encapsulate weight of a third coating on said second coated agents, said third coating consisting essentially of a major portion of a fatty acid and a sufficient amount of said microcrystalline wax to plasticize said third coating. - View Dependent Claims (9, 10, 12, 13, 14)
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11. A bleaching agent as defined in claim 32 wherein said fatty acid is a mixture selected from the group consisting of:
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(a) about 83% stearic acid, about 11% palmitic acid, and about 6% of n-alkanoic acids of about 12 to about 20 carbon atoms other than stearic or palmitic acid, and (b) about 95% stearic acid and about 5% palmitic acid.
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15. A granulated bleaching agent encapsulated with a coating comprising:
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(a) about 35% to about 55% of the total encapsulate weight of a coating on said agents consisting essentially of a major proportion of a fatty acid being substantially non-reactive with said agents and having a melting point range of about 85°
F. to about 135°
F., a plasticizing amount of a microcrystalline wax having a melting point range of about 125°
F. to about 210°
F.; and(b) about 5% to about 20% by weight of the total encapsulate weight of a polyoxyethylene-polyoxypropylene copolymer having at least about 65% by weight of polyoxyethylene and having a molecular weight of about 8000 to about 16,500. - View Dependent Claims (16, 17, 18, 19)
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Specification