Patent US5246546A successfully refreshed from Google Patents.
US5246546A
Expired / Lapsed
US
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Process for applying a thin film containing polysiloxane to tissue paper
Assignee: Procter and Gamble Co
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Filing: 1992-08-27
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Granted: 1993-09-21
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Expires: 2012-08-27
Abstract
Abstract Disclosed is a process for making soft tissue paper which includes providing a dry tissue web and then applying a sufficient amount of a polysiloxane softener compound to the dry web. The softener application process includes the steps of diluting a polysiloxane compound with a suitable solvent, applying the diluted polysiloxane solution to a heated transfer surface, evaporating the solvent from the dilute solution to form a film, and then contacting the dry tissue web with the heated transfer surface. Preferably, the tissue web is dried to a moisture level below its equilibrium moisture content before application of the polysiloxane material. The process may further include the steps of applying an effective amount of a surfactant material to enhance softness and/or wettability control; and/or an effective amount of a binder material such as starch, for linting control, and/or to contribute tensile strength to the tissue paper.
Inventors
- 👤 Robert S. Ampulski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:09
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/22; D21H17/00; D21H19/00; D21H19/10; D21H19/14; D21H19/24; D21H19/32; D21H23/00; D21H23/02; D21H23/22; D21H23/52; D21H23/56
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
160 words
An improved process for applying a polysiloxane compound to a dried and creped tissue paper web, said process comprising the steps of: a) providing a dried and creped tissue paper web; b) diluting a polysiloxane compound with a suitable solvent to form a dilute polysiloxane solution; c) applying said dilute polysiloxane solution to a heated transfer surface, wherein said heated transfer surface is a hot cylinder roll; d) evaporating at least a portion of said solvent from said hot calender roll to form a film containing said polysiloxane compound; and e) transferring said film from said hot calender roll to at least one outwardly-facing surface of said dried and creped tissue web by contacting said outwardly-facing web surface with said hot calender roll, and transferring a sufficient amount of said polysiloxane compound; such that from about 0.004% to about 0.74% of said polysiloxane compound, based on the dry fiber weight of said tissue web, is retained by said tissue web.
Claim 2
Dependent Claim
160 words
An improved process for applying a polysiloxane compound to a dried and creped tissue paper web, said process comprising the steps of: a) providing a dried and creped tissue paper web; b) diluting a polysiloxane compound with a suitable solvent to form a dilute polysiloxane solution; c) applying said dilute polysiloxane solution to a heated transfer surface, wherein said heated transfer surface is a hot cylinder roll; d) evaporating at least a portion of said solvent from said hot calender roll to form a film containing said polysiloxane compound; and e) transferring said film from said hot calender roll to at least one outwardly-facing surface of said dried and creped tissue web by contacting said outwardly-facing web surface with said hot calender roll, and transferring a sufficient amount of said polysiloxane compound; such that from about 0.004% to about 0.74% of said polysiloxane compound, based on the dry fiber weight of said tissue web, is retained by said tissue web.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein the solvent in step (b) is water.
Claim 4
Dependent Claim
19 words
The process of claim 2 wherein said polysiloxane in step (b) further comprises an effective amount of an emulsifier.
Claim 5
Dependent Claim
20 words
The process of claim 3 wherein from about 0.01% to about 0.3% of said polysiloxane is retained by said web.
Claim 6
Dependent Claim
53 words
The process of claim 3 wherein said polysiloxane is a polydimethylpolysiloxane having a hydrogen bonding functional group selected from the groups consisting of amino, carboxyl, hydroxyl, ether, polyether, aldehyde, ketone, amide, ester and thiol groups, said hydrogen bonding functional group being present in a molar percentage of substitution of about 20% or less.
Claim 7
Dependent Claim
28 words
The process of claim 5 wherein said polysiloxane has a molar percentage of substitution of about 10% or less, and a viscosity of about 25 centistokes or more.
Claim 8
Dependent Claim
33 words
The process of claim 5 wherein said polysiloxane has a molar percentage of substitution of from about 1.0% to about 5%, and a viscosity of from about 25 centistokes to about 20,000,000 centistokes.
Claim 9
Dependent Claim
21 words
The process of claim 5 wherein said molar percentage of substitution is about 2%, and said viscosity is about 125 centistokes.
Claim 10
Dependent Claim
16 words
The process of claim 5 wherein said hydrogen bonding functional group is an amino functional group.
Claim 11
Dependent Claim
47 words
The process of claim 3 further comprising the step of applying to said web, a sufficient amount of water soluble surfactant such that from about 0.01% to about 2.0% of said surfactant, based on the dry fiber weight of said tissue paper, is retained by said web.
Claim 12
Dependent Claim
28 words
The process of claim 10 wherein said quantity of said surfactant is from about 0.05% to about 1.0% based on the dry fiber weight of said tissue paper.
Claim 13
Dependent Claim
10 words
The process of claim 10 wherein said surfactant is noncationic.
Claim 14
Dependent Claim
13 words
The process of claim 12 wherein said noncationic surfactant is a nonionic surfactant.
Claim 15
Dependent Claim
18 words
The process of claim 10 wherein said surfactant has a melting point of at least about 50° C.
Claim 16
Dependent Claim
45 words
The process of claim 3 further comprising the step of applying to said web, a sufficient amount of a binder such that from about 0.01% to about 2.0% said binder, based on the dry fiber weight of said tissue paper, is retained by said web.
Claim 17
Dependent Claim
10 words
The process of claim 15 wherein said binder is starch.
Claim 18
Dependent Claim
30 words
The process of claim 16 wherein from about 0.1% to about 1.0% of said starch, based on the dry fiber weight of said tissue paper, is retained by said weight.
Claim 19
Dependent Claim
11 words
The process of claim 15 wherein said starch is amioca starch.
Claim 20
Dependent Claim
46 words
The process of claim 10 further comprising the step of applying to said web, a sufficient amount of a binder such that from about 0.01% to about 2.0% of said binder, based on the dry fiber weight of said tissue paper, is retained by said web.
Claim 21
Dependent Claim
16 words
The process of claim 19 wherein said surfactant is noncationic and wherein said binder is starch.
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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) | 1996-09-20 | 1997-03-22 | 1997-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-20 | 2001-03-22 | 2001-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-20 | 2005-03-22 | 2005-09-21 | $7700.00 | Window Closed / Lapsed |