GB2243327A
Expired / Lapsed
GB
⏱️ 0.0 years remaining
Biodegradable, liquid-impervious sheet laminate
Assignee: Procter and Gamble Co
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Filing: 1990-02-16
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Granted: —
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Expires: 2010-02-16
Abstract
Abstract Biodegradable sheet laminates are comprised of at least one liquid-impervious film of a biodegradable thermoplastic polymer and at least one layer of a fibrous substrate comprised of biodegradable fibers. The polymer may be cast, coated or sprayed onto the fibrous substrate. Preferred biodegradable thermoplastic polymers are based on copolymers of hydroxycarboxylic acids. The fibers may be formed from a thermoplastic biodegradable polymer or be a cellulose or modified cellulose. The laminate may be used as the backsheet (16) of a disposable absorbent product such as a sanitary napkin or diaper together with a liquid pervious topsheet (12) and an absorbent structure between the topsheet and backsheet. <IMAGE>
Inventors
- 👤 Francis Jean Cracco
- 👤 Peter Hale
Bibliographic Details
Application Number
—
Jurisdiction
GB
Data Source
google_patents
Last Synchronized
2026-10-23 05:16
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/12; A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/26; B32B5/00; B32B5/02; B32B5/022; B32B2262/00; B32B2262/04; B32B2307/00; B32B2307/70; B32B2307/716; B32B2307/7163; B32B2307/726; B32B2307/7265; B32B2555/00; B32B2555/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
38 words
A biodegradable, liquid-impervious, sheet laminate, suitable for use in disposable absorbent products, comprising
a) at least one liquid-imperuious film of a
biodegradable thermoplastic polymer: and
b) at least one layer of a fibrous substrate comprised
of biodegradable fibers.
Claim 2
Dependent Claim
38 words
A biodegradable, liquid-impervious, sheet laminate, suitable for use in disposable absorbent products, comprising
a) at least one liquid-imperuious film of a
biodegradable thermoplastic polymer: and
b) at least one layer of a fibrous substrate comprised
of biodegradable fibers.
Claim 3
Dependent Claim
25 words
A biodegradable sheet laminate according to claim 1, wherein the fibrous substrate has a tensile strength, at break, in cross-machine direction of at least.4 N.
Claim 4
Dependent Claim
115 words
A biodegradable sheet laminate according to claim 1 or 2, wherein the biodegradable thermoplastic polymer is a copolymer having a weight average molecular weight aboue 10.000 and containing repeat units 0.CH(CH3)CH2C0 I
and repeat units 0.CR1 R2 (CR3 R4) )nCO II 1 2 3 where n is O or an integer and R , R , R , and R are each selected from hydrocarbon radicals;
halo- and hydroxy-substituted hydrocarbon radicals;
hydroxy radicals; halogen atoms; and hydrogen atoms,
prouided that, where n is 1 and R2, R3 , and
are each hydrogen atoms, R1 is not methyl, said
repeat units II constituting 0.1 to 50 mole % of the
total repeat units in said copolymer.
Claim 5
Dependent Claim
23 words
n biodegradable sheet laminate according to claim 3, the thermoplastic polymer being characterized in that
R2, R3 and R 4. are each hydrogen.
Claim 6
Dependent Claim
74 words
A biodegradable sheet laminate according to claim 1 or 2, wherein the biodegradable thermoplastic polymer is a copolymer having a weight average molecular weight above 10.000 and containing at least 50 mol % of repeat units O.CH(CH3)CH2CO and being characterised by a triplet at 4.3 ppm as measured by proton nuclear magnetic resonance spectroscopy and peaks at 59.89 and 33.83 ppm (relative to a tetramethyl silane standard) measured by 13C nuclear magnetic resonance spectroscopy.
Claim 7
Dependent Claim
28 words
A biodegradable sheet laminate according to any one of claims 3-5, characterized in that the biodegradable thermoplastic polymer has a weight average molecular weight of at least 200.000.
Claim 8
Dependent Claim
32 words
A biodegradable sheet laminate according to any one of claims 1-6 characterized in that the fibrous substrate is a non-woven rayon fabric having a basis weight of at 2 least 15 g/m
Claim 9
Dependent Claim
23 words
A biodegradable sheet laminate according to claim 7 wherein the nonwoven rayon fabric has a basis weight of from 19 to 40 g/m2.
Claim 10
Dependent Claim
31 words
n biodegradable sheet laminate according to any one of the preceding claims wherein the biodegradable thermoplastic polymer film has a thickness of from 15 to 30 micrometers (12.5 to 37 g/m).
Claim 11
Dependent Claim
45 words
A disposable absorbent product comprising
a) a liquid peruious topsheet;
b) a liquid-impervious backsheet; and c) an absorbent structure disposed between said topsheet and said backsheet; characterized in that said liquid-impervious back sheet is a biodegradable sheet laminate according to any one of claims 1-9.
Claim 12
Dependent Claim
12 words
The disposable absorbent product of claim 10 which is a disposable diaper.
References Cited (Backward Citations)
EP0226439A1
Cited
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