Patent CA1104026A successfully refreshed from Google Patents.
CA1104026A
Expired / Lapsed
CA
⏱️ 0.0 years remaining
Polyvinyl acetate latex impregnated towelette
Assignee: Air Products and Chemicals Inc
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Filing: 1979-01-18
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Granted: 1981-06-30
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Expires: 1999-01-18
Abstract
Abstract ABSTRACT OF THE DISCLOSURE 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
- 👤 George Davidowich
- 👤 Wiley E. Daniels
- 👤 Gerald D. Miller
Bibliographic Details
Application Number
—
Jurisdiction
CA
Data Source
google_patents
Last Synchronized
2026-11-05 22:11
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/64; D04H1/587; Y; Y10; Y10T; Y10T442/00; Y10T442/20; Y10T442/2861; Y10T442/2877
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
82 words
A packaged towelette composed of a sheet of nonwoven fibers impregnated with a dried emulsion of polyvinyl acetate or vinyl acetate-ethylene copolymer containing polyvinyl alcohol as a protective colloid, said sheet being maintained in wet condition within said package by contact with a non-alkaline aqueous solution of a compound having the capacity of gelling or precipitating polyvinyl alcohol solutions, and said compound being selected from the group consisting of boric acid and soluble salts having an acid to neutral pH on hydrolysis.
Claim 2
Dependent Claim
82 words
A packaged towelette composed of a sheet of nonwoven fibers impregnated with a dried emulsion of polyvinyl acetate or vinyl acetate-ethylene copolymer containing polyvinyl alcohol as a protective colloid, said sheet being maintained in wet condition within said package by contact with a non-alkaline aqueous solution of a compound having the capacity of gelling or precipitating polyvinyl alcohol solutions, and said compound being selected from the group consisting of boric acid and soluble salts having an acid to neutral pH on hydrolysis.
Claim 3
Dependent Claim
32 words
The article as defined in Claim 1 wherein said aqueous solution comprises boric acid in a concentration of at least 1% by weight up to the limit of its solubility in water.
Claim 4
Dependent Claim
27 words
The article as defined in Claim 1 wherein said aqueous solution comprises boric acid having a concentration in the range of about 3 to 5% by weight.
Claim 5
Dependent Claim
21 words
The article as defined in Claim 1 wherein said polyvinyl alcohol protective colloid ranges from partially hydrolyzed to fully hydrolyzed grades.
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
29 words
The article as defined in Claim 1 wherein said aqueous solution comprises a soluble salt in a concentration in the range of about 3 to about 20% by weight.
Claim 8
Dependent Claim
14 words
The article as defined in Claim 6 wherein said soluble salt comprises sodium sulfate.
Claim 9
Dependent Claim
68 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 with a dried film of polyvinyl acetate or 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 10
Dependent Claim
68 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 with a dried film of polyvinyl acetate or 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 11
Dependent Claim
22 words
The article as defined in Claim 8 wherein said protec-tive colloid ranges from about 80 to 99% by weight hydrolyzed vinyl acetate.
Claim 12
Independent Claim
123 words
The method of preparing a packaged article useful as a skin cleansing wiping cloth, which comprises treating a web of nonwoven fibers with an emulsion of polyvinyl acetate or a copolymer of vinyl acetate and ethylene, said emulsion comprising water soluble polyvinyl alcohol as a protective colloid; drying the treated web to form a dry coating film of said emulsion on said web; and packaging sheets of such treated material in folded condition in an impervious closed container wherein said folded sheets are maintained in contact with a non-alkaline aqueous solution of a compound serving to temporarily insolubilize said film, said compound being selected from the group consisting of boric acid and water soluble salts having an acid to neutral pH on hydrolysis.
Claim 13
Independent Claim
123 words
The method of preparing a packaged article useful as a skin cleansing wiping cloth, which comprises treating a web of nonwoven fibers with an emulsion of polyvinyl acetate or a copolymer of vinyl acetate and ethylene, said emulsion comprising water soluble polyvinyl alcohol as a protective colloid; drying the treated web to form a dry coating film of said emulsion on said web; and packaging sheets of such treated material in folded condition in an impervious closed container wherein said folded sheets are maintained in contact with a non-alkaline aqueous solution of a compound serving to temporarily insolubilize said film, said compound being selected from the group consisting of boric acid and water soluble salts having an acid to neutral pH on hydrolysis.
Claim 14
Dependent Claim
32 words
The method as defined in Claim 10 wherein said aqueous solution comprise boric acid in a concentration of at least 1% by weight up to the limit of its solubility in water.
Claim 15
Dependent Claim
41 words
The method as defined in Claim 10 wherein said emulsion contains from 100 to 40% by weight vinyl acetate and 0 to 60% by weight ethylene and 1 to 10 parts by weight polyvinyl alcohol per 100 parts of said emulsion.
Claim 16
Dependent Claim
17 words
The method as defined in Claim 12 wherein said emulsion contains 40 to 65% solids by weight.
Claim 17
Dependent Claim
27 words
The method as defined in Claim 12 wherein said emulsion is applied to said web under conditions to effect 5-50% dry add-on by weight of the web.
References Cited (Backward Citations)
No citation records indexed.
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