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Biodegradable, liquid impervious multilayer film compositions    
United States Patent5391423   
Link to this pagehttp://www.wikipatents.com/5391423.html
Inventor(s)Wnuk; Andrew J. (Wyoming, OH); Koger, II; Thurman J. (Hamilton, OH); Young; Terrill A. (Cincinnati, OH)
AbstractBiodegradable, liquid impervious multilayer film compositions are disclosed. In particular, the films comprise composite structures derived from multilayer combinations of biodegradable polymers. The biodegradable polymers are selected from the categories of moisture sensitive polymers, thermally sensitive polymers, mechanically limited polymers, polymers not easily processed into films, hydrolytically cleavable polymers, and degradable elastomers. Optionally, the multilayer films may further comprise additional adhesive tie layers. The biodegradable polymers are combined in various ways to overcome the deficiencies of the individual components, yet at the same time impart specific performance properties to the film. The multilayer film compositions are suitable for use as backsheets in disposable absorbent products including diapers, adult incontinent pads, sanitary napkins, pantiliners, and the like.
   














 Title Information Submit all comments and votes
 
Patent Text Patent PDF Print Page Summary File History
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Inventor     Wnuk; Andrew J. (Wyoming, OH); Koger, II; Thurman J. (Hamilton, OH); Young; Terrill A. (Cincinnati, OH)
Owner/Assignee     The Procter & Gamble Company (Cincinnati, OH)
Patent assignment
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Publication Date     February 21, 1995
Application Number     08/126,672
PAIR File History     Application Data   Transaction History
Image File Wrapper   Patent Term   Fees
Litigation
Filing Date     September 24, 1993
US Classification     428/217 428/220 428/424.8 428/425.1 428/480 428/500 428/532 428/913
Int'l Classification     B32B 007/02 B32B 027/36 B32B 027/00
Examiner     Sluby; P. C.
Assistant Examiner    
Attorney/Law Firm     Hersko; Bart S. Henderson; Loretta J. , Linman; E. Kelly ,
Address
Parent Case     This is a continuation of application Ser. No. 07/905,057, filed on Jun. 26, 1992 now abandoned.
Priority Data    
USPTO Field of Search     428/500 428/480 428/532 428/217 428/220 428/425.1 428/424.8 428/913
Patent Tags     biodegradable, liquid impervious multilayer film compositions
   
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What is claimed is:

1. A biodegradable liquid-impervious multilayer film comprising:

a first polymer film layer and a second polymer film layer joined to said first layer; said polymer film layers comprising a thermoplastic polymer capable of forming a film by a melt process, said thermoplastic polymer being selected from the group consisting of:

(a) moisture sensitive polymers selected from the first group consisting of interpenetrated networks of destructurized starch, mixtures of destructurized starch, thermoplastic polyvinyl alcohol compositions, hydroxypropyl cellulose, and mixtures thereof;

(b) thermally sensitive polymers selected from the group consisting of polycaprolactone, other aliphatic polyesters having melting points below about 65.degree. C. or Vicat softening points of 45.degree. C. or less, and mixtures thereof;

(c) mechanically limited polymers selected from the group consisting of cellulose esters, cellulose ester blends with polycaprolactone, cellulose ester blends with polyhydroxybutyrate/valerate copolymers, and mixtures thereof;

(d) poly(alpha-hydroxy alkanoates);

(e) hydrolytically cleavable aromatic/aliphatic polyester copolymers selected from the group consisting of copolymers of polyethylene terephthalate and polybutylene terephthalate, wherein the aliphatic fraction of said copolymer is derived from the group consisting of oxalates, malonates, succinates, glutarates, adipates, pimelates, suberates, azelates, sebacates, nonanedioates, glycolates, and mixtures thereof;

(f) oxidized ethylene/carbon monoxide copolymers;

(g) aliphatic polyesters having melting temperatures or glass transition temperatures above 65.degree. C.; and

(h) thermoplastic, biodegradable elastomers selected from the group consisting of polycaprolactone/diene block copolymers and aliphatic polyester urethanes;

said first and second polymer film layers comprising different polymers;

said multilayer film having:

a machine direction (MD) tensile modulus from about 6.895.times.10.sup.8 dynes/sq. cm. to 6.895.times.10.sup.9 dynes/sq. cm. (10,000 to about 100,000 lbs./sq. in.);

a MD tear strength of at least 70 grams per 25.4 microns of thickness;

a cross machine direction (CD) tear strength of at least 70 grams per 25.4 microns of thickness;

an impact strength of at least 12 centimeters as measured by falling ball drop;

a moisture transpod rate less than about 0.0012 grams per square centimeter per 16 hours;

a modulus at 60.degree. C. of at least 5.52.times.10.sup.7 dynes/sq. cm. (800 lbs./sq. in.); and

a thickness from about 12 microns to about 75 microns.

2. The multilayer film of claim 1 wherein said poly(alpha-hydroxy alkanoate) is selected from the group consisting of polyhydroxybutyrate, polyhydroxybutyrate/valerate copolymers, and mixtures thereof.

3. The multilayer film of claim 1 wherein said oxidized ethylene/carbon monoxide copolymer is derived from ethylene/carbon monoxide copolymers containing 0.5 to 20 weight percent carbon monoxide.

4. The multilayer film of claim 1 wherein the multilayer film additionally comprises a third polymer film layer joined to said second layer such that the multilayer film comprises a center core layer forme