Biodegradable, liquid impervious multilayer film compositions
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B32B-007/02
B32B-027/36
B32B-027/00
출원번호
US-0126672
(1993-09-24)
발명자
/ 주소
Wnuk Andrew J. (Wyoming OH) Koger
II Thurman J. (Hamilton OH) Young Terrill A. (Cincinnati OH)
출원인 / 주소
The Procter & Gamble Company (Cincinnati OH 02)
인용정보
피인용 횟수 :
116인용 특허 :
0
초록▼
Biodegradable, 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 se
Biodegradable, 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.
대표청구항▼
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
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°C. or Vicat softening points of 45°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°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 6.895×108 dynes/sq. cm. to 6.895×109 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°C. of at least 5.52×107 dynes/sq. cm. (800 lbs./sq. in.); and a thickness from about 12 microns to about 75 microns.
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