Patent EP0157612A2 successfully refreshed from Google Patents.
EP0157612A2
Expired / Lapsed
EP
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Rubber toughened polyvinyl alcohol films
Assignee: Clorox Co
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Filing: 1985-03-29
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Granted: —
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Expires: 2005-03-29
Abstract
Abstract Polymer compositions are provided which may be cast as thin, self-supporting films, useful in forming sealed envelopes or pouches containing granulated pulverulent or non-aqueous liquid materials. The cast films comprise a polymeric matrix, having at least about 50 weight percent polyvinyl alcohol, and a plurality of microdomains dispersed throughout the polymeric matrix. The films have good resistance to breakage at low temperatures and low relative humidities.
Inventors
- 👤 Daniel Ming Chang
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 15:40
CPC Classifications
C; C11; C11D; C11D17/00; C11D17/04; C11D17/041; C11D17/042; C08; C08L; C08L29/00; C08L29/02; C08L29/04; C08L21/00
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
53 words
A self-supporting film comprising: a polymeric matrix, the polymeric matrix including polyvinyl alcohol; and a plurality of microdomains dispersed throughout the polymeric matrix, the microdomains consisting essentially of a rubbery material having a glass transition temperature of less than about 0°C, the microdomains being at least about 3 wt % of the film.
Claim 2
Dependent Claim
53 words
A self-supporting film comprising: a polymeric matrix, the polymeric matrix including polyvinyl alcohol; and a plurality of microdomains dispersed throughout the polymeric matrix, the microdomains consisting essentially of a rubbery material having a glass transition temperature of less than about 0°C, the microdomains being at least about 3 wt % of the film.
Claim 3
Dependent Claim
19 words
The film as in claim 1 wherein a thickness thereof is from about 0.05 mm to about 0.5 mm.
Claim 4
Dependent Claim
70 words
A sealed envelope comprising: a self-supporting film, the film formed by a polymeric matrix, the polymeric matrix having a plurality of microdomains dispersed throughout the polymeric matrix, the polymeric matrix comprising at least about 50 wt % polyvinyl alcohol, the plurality of microdomains consisting essentially of arubbery material having a glass transition temperature of less than about 0°C, the microdomains being at least about 3 wt. % of the film.
Claim 5
Dependent Claim
70 words
A sealed envelope comprising: a self-supporting film, the film formed by a polymeric matrix, the polymeric matrix having a plurality of microdomains dispersed throughout the polymeric matrix, the polymeric matrix comprising at least about 50 wt % polyvinyl alcohol, the plurality of microdomains consisting essentially of arubbery material having a glass transition temperature of less than about 0°C, the microdomains being at least about 3 wt. % of the film.
Claim 6
Dependent Claim
39 words
The film or envelope as in any one of the preceding claims wherein the polyvinyl alcohol of the polymeric matrix is in a weight ratio with respect to the plurality of microdomains of between about 32:1 to about 2.3:1.
Claim 7
Dependent Claim
39 words
The film or envelope as in any one of the preceding claims wherein the polyvinyl alcohol of the polymeric matrix is in a weight ratio with respect to the plurality of microdomains of between about 19:1 to about 6:1.
Claim 8
Dependent Claim
29 words
The film or envelope as in any one of the preceding claims wherein the microdomains are from about 5 wt % to about 15 wt % of the film.
Claim 9
Dependent Claim
26 words
The film or envelope as in any one of the preceding claims wherein substantially all of the microdomains are less than about 10 microns in size.
Claim 10
Dependent Claim
26 words
The film or envelope as in claim 7 wherein at least most of the microdomains are from about 0.5 micron to about 2 micron in size.
Claim 11
Dependent Claim
29 words
The film or envelope as in any one of the preceding claims wherein the rubbery material of the microdomains has a glass transition temperature of about -18°C or less.
Claim 12
Dependent Claim
30 words
An envelope as in any one of claims 2 to 9 further comprising a liquid detergent within the film and contained thereby, which liquid detergent has substantially no free water.
Claim 13
Dependent Claim
100 words
An article useful for treating fabrics comprising: a flexible pouch, the pouch being resistant to breakage at low temperature and low relative humidity, the pouch formed by a plastic phase and a rubber phase, the plastic phase including polyvinyl alcohol and being in an amount of from about 70 wt % to about 97 % wt of the pouch, the rubber phase having a glass transition temperature at or below about -18°C and being an amount of from at least about 3 wt % to about 30 wt % of the pouch; and a laundering aid disposed within the pouch.
Claim 14
Dependent Claim
100 words
An article useful for treating fabrics comprising: a flexible pouch, the pouch being resistant to breakage at low temperature and low relative humidity, the pouch formed by a plastic phase and a rubber phase, the plastic phase including polyvinyl alcohol and being in an amount of from about 70 wt % to about 97 % wt of the pouch, the rubber phase having a glass transition temperature at or below about -18°C and being an amount of from at least about 3 wt % to about 30 wt % of the pouch; and a laundering aid disposed within the pouch.
Claim 15
Dependent Claim
35 words
An envelope or article as in any one of claims 3 to 11 wherein: the polyvinyl alcohol has a molecular weight of from about 10,000 to about 100,000 and is about 70% to 100% hydrolyzed.
Claim 16
Dependent Claim
36 words
An envelope or article as in any one of claims 3 to 12 wherein: the rubber phase comprises polysiloxane, polyethylene, polyoxyethylene, neoprene, isoprene, natural rubber, acrylate, styrene-butadiene cbpolymer, polyisobutylene, polypropylene polyvinyl-fluoride, polyvinylidene chloride or mixtures thereof.
Claim 17
Dependent Claim
33 words
An envelope or article as in any one of claims 3 to 13 wherein a wall of the envelope or pouch has a thickness of from about 0.05 mm to about 0.5 mm.
Claim 18
Dependent Claim
28 words
An envelope or article as in any one of claims 3 to 14 wherein the envelope or pouch is soluble or dispersible in water or an aqueous solution.
Claim 19
Dependent Claim
90 words
An aqueous polymer composition castable as a thin, self-supporting film comprising: a polyvinyl alcohol component and a rubber component, the polyvinyl alcohol component having a molecular weight from about 10,000 to about 100,000 and being about 70% to about 100% hydrolyzed, the rubber component having a glass transition temperature when in film form of less than about 0°C and being at least partially incompatible when cast in film form with the polyvinyl alcohol component; and an aqueous solution in which the polyvinyl alcohol component and the rubber component are dispersed.
Claim 20
Dependent Claim
90 words
An aqueous polymer composition castable as a thin, self-supporting film comprising: a polyvinyl alcohol component and a rubber component, the polyvinyl alcohol component having a molecular weight from about 10,000 to about 100,000 and being about 70% to about 100% hydrolyzed, the rubber component having a glass transition temperature when in film form of less than about 0°C and being at least partially incompatible when cast in film form with the polyvinyl alcohol component; and an aqueous solution in which the polyvinyl alcohol component and the rubber component are dispersed.
Claim 21
Dependent Claim
22 words
The polymer composition as in claim 16 wherein the aqueous solution includes sorbitol, mannitol, dextran, glycerin, a wetting agent or mixtures thereof.
Claim 22
Dependent Claim
87 words
A self-supporting film comprising: a polymeric matrix, the polymeric matrix including polyvinyl alcohol; and a plurality of microdomains dispersed throughout the polymeric matrix, the microdomains being from about 0.5 microns to about 10 microns in size, the microdomains having a glass transition temperature of less than about 0°C, the microdomains being at least about 3 wt % of the film, the polyvinyl alcohol of - the polymeric matrix being in a weight ratio with respect to the plurality of microdomains of between about 32:1 to about 2.3:1.
Claim 23
Dependent Claim
87 words
A self-supporting film comprising: a polymeric matrix, the polymeric matrix including polyvinyl alcohol; and a plurality of microdomains dispersed throughout the polymeric matrix, the microdomains being from about 0.5 microns to about 10 microns in size, the microdomains having a glass transition temperature of less than about 0°C, the microdomains being at least about 3 wt % of the film, the polyvinyl alcohol of - the polymeric matrix being in a weight ratio with respect to the plurality of microdomains of between about 32:1 to about 2.3:1.
Claim 24
Independent Claim
43 words
A method of increasing the tensile strength of polyvinyl alcohol films comprising: providing a polyvinyl alcohol solution; admixing a rubber solution with the polyvinyl alcohol solution, the rubber solution being at least partially incompatible with the polyvinyl alcohol solution; and casting the admixture.
Claim 25
Independent Claim
43 words
A method of increasing the tensile strength of polyvinyl alcohol films comprising: providing a polyvinyl alcohol solution; admixing a rubber solution with the polyvinyl alcohol solution, the rubber solution being at least partially incompatible with the polyvinyl alcohol solution; and casting the admixture.
References Cited (Backward Citations)
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