Patent US4497718A successfully refreshed from Google Patents.
US4497718A
Expired / Lapsed
US
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Homogeneous aqueous fabric softening composition with stilbene sulfonic acid fluorescent whitener
Assignee: Lever Brothers Co
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Filing: 1983-04-20
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Granted: 1985-02-05
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Expires: 2003-04-20
Abstract
Abstract The invention provides a composition and method wherein fluorescent whitening agents are satisfactorily dispersed in fabric softening compositions and viscosity stability of the composition is achieved. The fabric softening and whitening composition comprises: (i) from about 0.5% to about 10% of a cationic surfactant; (ii) from about 0.001% to about 0.3% of a stilbene sulfonic acid fluorescent whitening agent; (iii) from about 0.001% to about 0.5% of a non-ionizable base; and (iv) deionized water. The method for preparing the fabric softening system comprises forming an organic premix of fabric softening cationic surfactant, stilbene sulfonic acid fluorescent whitening agent and non-ionizable base. The organic premix is then added to deionized water containing other fabric softening adjuncts including an acidic pH adjusting agent to obtain pH of 3-6, the combination being stirred to uniformly disperse all components.
Inventors
- 👤 Oscar W. Neiditch
- 👤 Edmund S. Hurdle
- 👤 Daniel J. Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:35
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/40; C11D3/42; C11D3/0005; C11D3/001; C11D3/0015; D; D06; D06L; D06L4/00; D06L4/60; D06L4/664
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
123 words
A method for forming a fabric softening system containing fluorescent whitening agents comprising: (a) preparing an organic premix of: (i) from about 0.5% to about 10% fabric softening cationic surfactant; (ii) from about 0.001% to about 0.3% stilbene sulfonic acid fluorescent whitening agent added in acid form; (iii) from about 0.001% to about 0.5% of a nonionizable base, the ratio of base to fluorescent whitening agent on an equivalent weight basis being about 1:1 to about 6:1; (b) adding said premix to deionized water containing water-soluble adjunct fabric softening components including from 0.01% to 0.3% of an acidic pH adjusting agent to obtain a pH of 3.0 to 6.0; and (c) mixing the combined blends with sufficient stirring to uniformly disperse all components.
Claim 2
Independent Claim
123 words
A method for forming a fabric softening system containing fluorescent whitening agents comprising: (a) preparing an organic premix of: (i) from about 0.5% to about 10% fabric softening cationic surfactant; (ii) from about 0.001% to about 0.3% stilbene sulfonic acid fluorescent whitening agent added in acid form; (iii) from about 0.001% to about 0.5% of a nonionizable base, the ratio of base to fluorescent whitening agent on an equivalent weight basis being about 1:1 to about 6:1; (b) adding said premix to deionized water containing water-soluble adjunct fabric softening components including from 0.01% to 0.3% of an acidic pH adjusting agent to obtain a pH of 3.0 to 6.0; and (c) mixing the combined blends with sufficient stirring to uniformly disperse all components.
Claim 3
Dependent Claim
25 words
A method according to claim 1 wherein heat is applied in stirring both the cationic blend and the combination of cationic and with aqueous blends.
Claim 4
Dependent Claim
95 words
A method according to claim 1 wherein the cationic surfactant has the formula: ##STR7## wherein R 1 is an alkyl or alkenyl group having from 8 to 22 carbon atoms; R 2 is an alkyl group containing from 1 to 3 carbon atoms; R 3 and R 4 is selected from the group consisting of R 1 and R 2 ; X is an anion selected from the group consisting of halides, sulfates, alkyl sulfates having from 1 to 3 carbon atoms in the alkyl chain, and acetates; and y is the valency of X.
Claim 5
Dependent Claim
60 words
A method according to claim 1 wherein the cationic surfactants have the formula: ##STR8## wherein R 5 is hydrogen or a C 1 -C 4 alkyl radical, R 6 is a C 1 -C 4 alkyl radical, R 7 is a C 9 -C 25 alkyl radical and R 8 is hydrogen or a C 8 -C 25 alkyl radical.
Claim 6
Dependent Claim
24 words
A method according to claim 4 wherein R 6 is methyl, R 7 and R 8 are tallow alkyl and R 5 is hydrogen.
Claim 7
Dependent Claim
21 words
A method according to claim 1 wherein the cationic surfactant is a mixture of non-cyclic quaternary ammonium salt and imidazolinium salts.
Claim 8
Dependent Claim
18 words
A method according to claim 1 wherein the fluorescent whitening agent is either 4,4'-bis[(4-phenylamino-6-N-bis(2-hydroxyethyl)amino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acids or 5-(2H-naphtho[1,2d]triazol-2-yl]-2-(2-phenylethenyl)-benzene-sulfonic acid.
Claim 9
Dependent Claim
29 words
A method according to claim 1 wherein the non-ionizable base is chosen from the group consisting of ammonia, alkanolamine, pyridine, pyrrole, pyrrolidone, piperidine, piperazine, morpholine, alkylamines and mixtures thereof.
Claim 10
Dependent Claim
24 words
A method according to claim 8 wherein the non-ionizable base is an alkyl, alkenyl, aryl or alkylaryl derivative of the bases in claim 8.
Claim 11
Dependent Claim
25 words
A method according to claim 1 wherein the non-ionizable base is a mono-, di- or tri-alkylamine, the alkyl group being C 1 -C 24 .
Claim 12
Dependent Claim
23 words
A method according to claim 1 wherein the non-ionizable base is selected from the group consisting of monoethanolamine, diethanolamine, triethanolamine and mixtures thereof.
Claim 13
Dependent Claim
16 words
A method according to claim 1 wherein the cationic surfactant is dimethyl dihydrogenated tallow ammonium chloride.
Claim 14
Dependent Claim
15 words
A method according to claim 1 wherein the acid pH adjusting agent is citric acid.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-05 | 1988-08-06 | 1989-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-05 | 1992-08-06 | 1993-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-05 | 1996-08-06 | 1997-02-05 | $7700.00 | Window Closed / Lapsed |