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US 4,427,558 AGranted
Fabric conditioning materials
AssigneeLever Brothers Company
InventorJohn G. David
Life of this patent
Estimating the term…
Abstract
Particles for softening fabrics either in a wash liquor or in the rinse, are formed from a liquid mixture comprising water, a cationic material, such as a quaternary ammonium compound, urea and a calcium soap. The particles are formed from the liquid mixture by cooling to a solid and then grinding or by spray cooling. Weathering to form a crisp free flowing powder is optional. The presence of water in the liquid mixture improves the processing of the particles.
Claims7
A method of producing fabric softening particles characterised by the steps of
- (i) forming a liquid mixture comprising:
- (A) from about 4% to about 80% by weight of a cationic fabric conditioning material;
- (B) from about 10% to about 90% by weight of urea;
- (C) from about 2% to about 50% by weight of water;
- and
- (D) from about 1% to about 50% by weight of an alkaline earth metal salt of a fatty acid having 8-30 carbon atoms, the weight ratio of fatty acid salt to cationic fabric conditioning material being between about 0.25:1 and about 0.5:1;
- and
- (iii) transforming the liquid mixture so formed into solid particles having a particle size of from about 0.1 to about 2000 microns.
5 more elements
Dependencies are inferred from the claim text.