US4343403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyvinyl acetate latex impregnated towelette
Assignee: Air Products and Chemicals Inc
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Filing: 1980-05-12
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Granted: 1982-08-10
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Expires: 2000-05-12
Abstract
Abstract Nonwoven fibrous sheets impregnated with latices of polyvinyl acetate or its copolymers containing polyvinyl alcohol, intended for use in pre-moistened condition as skin cleansing tissues, are folded and packaged in closed containers or in individual sealed water impervious envelopes; said packaged sheets being maintained in contact with a dilute aqueous solution of a precipitating or gelling agent for polyvinyl alcohol, such as boric acid. The agent imparts improved wet tensile strength to the sheet during storage and use by the consumer but permits the sheet to be safely disposed of, after use, by flushing in plain water without danger of clogging the plumbing system.
Inventors
- 👤 Wiley E. Daniels
- 👤 George Davidowich
- 👤 Gerald D. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:36
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/64; D04H1/587; Y; Y10; Y10T; Y10T442/00; Y10T442/20; Y10T442/2762; Y10T442/277; Y10T442/2787; Y10T442/2828
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
63 words
A packaged towelette composed of a sheet of nonwoven fibers impregnated with an emulsion binder of vinyl acetate-ethylene copolymer containing polyvinyl alcohol as a protective colloid, said binder being maintained temporarily insolubilized in gel-like form while in wet condition within said package by contact with a non-alkaline aqueous solution of boric acid, wherein said temporarily insolubilized binder is dissolvable by flushing in water.
Claim 2
Dependent Claim
63 words
A packaged towelette composed of a sheet of nonwoven fibers impregnated with an emulsion binder of vinyl acetate-ethylene copolymer containing polyvinyl alcohol as a protective colloid, said binder being maintained temporarily insolubilized in gel-like form while in wet condition within said package by contact with a non-alkaline aqueous solution of boric acid, wherein said temporarily insolubilized binder is dissolvable by flushing in water.
Claim 3
Dependent Claim
32 words
The article as defined in claim 1 wherein said aqueous solution of boric acid is a concentration of at least 1% by weight up to the limit of its solubility in water.
Claim 4
Dependent Claim
26 words
The article as defined in claim 1 wherein said aqueous solution of boric acid having a concentration in the range of about 3 to 5% weight.
Claim 5
Dependent Claim
28 words
The article as defined in claim 1 wherein said polyvinyl alcohol protective colloid has a degree of hydrolysis of 80-90% and further has a low to medium viscosity.
Claim 6
Dependent Claim
24 words
The article as defined in claim 4 wherein said polyvinyl alcohol comprises 1 to 10 parts by weight per 100 parts of said emulsion.
Claim 7
Dependent Claim
75 words
A packaged towelette composed of a sheet of nonwoven fibers impregnated with an emulsion binder of vinyl acetate-ethylene copolymer containing polyvinyl alcohol as a protective colloid, said binder being maintained temporarily insolubilized in gel-like form while in wet condition within said package by contact with a non-alkaline aqueous solution of a soluble salt selected from the group consisting of sodium sulfate and potassium citrate, wherein said temporarily insolubilized binder is dissolvable by flushing in water.
Claim 8
Dependent Claim
75 words
A packaged towelette composed of a sheet of nonwoven fibers impregnated with an emulsion binder of vinyl acetate-ethylene copolymer containing polyvinyl alcohol as a protective colloid, said binder being maintained temporarily insolubilized in gel-like form while in wet condition within said package by contact with a non-alkaline aqueous solution of a soluble salt selected from the group consisting of sodium sulfate and potassium citrate, wherein said temporarily insolubilized binder is dissolvable by flushing in water.
Claim 9
Dependent Claim
29 words
The article as defined in claim 6 wherein said aqueous solution comprises a soluble salt in a concentration in the range of about 3 to about 20% by weight.
Claim 10
Dependent Claim
14 words
The article as defined in claim 7 wherein said soluble salt comprises sodium sulfate.
Claim 11
Dependent Claim
62 words
A wet skin cleansing cloth disposed in folded condition in an impervious sealed envelope, said cloth being readily toilet-flushable when removed from said envelope, and being formed of a nonwoven fiber sheet impregnated film of vinyl acetate-ethylene copolymer containing polyvinyl alcohol as a protective colloid, said sheet being maintained wet within said envelope by contact with an aqueous solution of boric acid.
Claim 12
Dependent Claim
62 words
A wet skin cleansing cloth disposed in folded condition in an impervious sealed envelope, said cloth being readily toilet-flushable when removed from said envelope, and being formed of a nonwoven fiber sheet impregnated film of vinyl acetate-ethylene copolymer containing polyvinyl alcohol as a protective colloid, said sheet being maintained wet within said envelope by contact with an aqueous solution of boric acid.
Claim 13
Dependent Claim
22 words
The article as defined in claim 9 wherein said protective colloid ranges from about 80 to 99% by weight hydrolyzed vinyl acetate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-09 | 1986-02-08 | 1986-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-09 | 1990-02-08 | 1990-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-09 | 1994-02-08 | 1994-08-10 | $7700.00 | Window Closed / Lapsed |