Patent ID: 7465699

Claim:
A method of softening a fabric article in a laundry process, the method comprising: a). subjecting a plurality of fabric articles to a laundry process; b). selecting at least one of the fabric articles, but not all of the fabric articles; c). providing a fabric softening composition comprising a polyalkyleneoxy polysiloxane, perfume, and water, wherein the polyalkyleneoxy polysiloxane is designed with Correlation I: S=3.246(√ t#di Si)−1.880(√% Si)−0.9066 √ t #EO +17.70 (I) wherein t#diSi is the average total number of the Si(CH 3 ) 2 O units in the molecule; t#EO is the average total number of the ethyleneoxy CH 2 CH 2 O units in the molecule; %Si is the weight percent of all siloxane units in the molecule; and the softness index S is at least 10; by: (i) choosing a desired S value, typically at least about 20; (ii) setting a desired average molecular weight, MW, being typically from about 7,500 to about 140,000; (iii) setting a desired %EO (weight % of all ethylene EO units in the molecule), then derive t#EO (the average total number of ethyleneoxy EO units in the molecule) with t#EO being typically from about 100 to about 1,800; (iv) choosing the type of polyalkyleneoxy polysiloxane selected from the group consisting of: polyethyleneoxy polysiloxane, polyethyleneoxy/polypropyleneoxy polysiloxanes, and mixtures thereof, then setting the desired %Si; (v) using the desired values for S, t#EO, and %Si to calculate t#diSi (the approximated total average number of dimethylsiloxane SiMe 2 O units in the molecule), using Correlation I, where t#diSi is typically from about 40 to about 450; (vi) calculating t#Si (the average number of all siloxane groups); and (vii) calculating t#linkSi (the average number of the polyalkyleneoxy pendant groups); and d). spraying the selected fabric article(s) with the fabric softening composition from a spray dispenser.