US4871791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permanently plasticized, cellulose-based product
Assignee: Hoechst AG
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Filing: 1988-04-05
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Granted: 1989-10-03
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Expires: 2008-04-05
Abstract
Abstract The cellulose-based product, in particular in the form of a film, contains in its wall a primary, permanent plasticizer of one or more crosslinked copolymers made from at least two components. One or more of these components are monomer units containing a terminal, ethylenically unsaturated, polymerizable group or compounds of maleic acid, or fumaric acid. A further component comprises units containing thermally crosslinked groups made from N-methylolamides of unsaturated carboxylic acids. A process is furthermore described for the production of this shaped product, in which the copolymer is metered into the viscose, and the N-methylolamide groups are thermally crosslinked with the cellulose.
Inventors
- 👤 Klaus-Dieter Hammer
- 👤 Manfred Siebrecht
- 👤 Hermann Winter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:20
CPC Classifications
A; A22; A22C; A22C13/00; A22C13/0013
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
71 words
A cellulose-based synthetic sausage casing, comprising a fiber-reinforced, cellulose-based tube and, located in the cellulose, a primary, permanent plasticizer which comprises at least one crosslinked copolymer, wherein at least one of the components of said copolymer comprises monomer units containing a terminal, ethylenically unsaturated, polymerizable group or units of compounds of maleic acid or fumaric acid, and wherein a further component of said copolymer comprises polymerized units containing thermally crosslinked groups.
Claim 2
Dependent Claim
71 words
A cellulose-based synthetic sausage casing, comprising a fiber-reinforced, cellulose-based tube and, located in the cellulose, a primary, permanent plasticizer which comprises at least one crosslinked copolymer, wherein at least one of the components of said copolymer comprises monomer units containing a terminal, ethylenically unsaturated, polymerizable group or units of compounds of maleic acid or fumaric acid, and wherein a further component of said copolymer comprises polymerized units containing thermally crosslinked groups.
Claim 3
Dependent Claim
18 words
A product as claimed in claim 1, wherein the thermally crosslinked groups comprise N-methyl-olamides of unsaturated carboxylic acids.
Claim 4
Dependent Claim
19 words
A product as claimed in claim 1, wherein the major components of the copolymer comprise methacrylate and/or acrylate units.
Claim 5
Dependent Claim
18 words
A product as claimed in claim 3, wherein said acrylic ester units comprise (C 1 -C 8 )-alkanols.
Claim 6
Dependent Claim
19 words
A product as claimed in claim 4, wherein said acrylic ester units comprise butyl methacrylate or butyl acrylate units.
Claim 7
Dependent Claim
28 words
A product as claimed in claim 3, wherein the proportion of the major components in the copolymer is in total equal to or greater than about 50 mol-%.
Claim 8
Dependent Claim
90 words
A product as claimed in claim 3, wherein the copolymer is additionally comprised of from one or more components made from units containing plural double bonds, from units of vinyl esters, of vinyl ethers, of vinyl aromatics, of olefins, of unsaturated monocarboxylic acids or dicarboxylic acids and the monoesters or diesters thereof with (C 2 -C 6 )-alkanols or (C 2 -C 6 )-alkylenediols, monoamides or diamides thereof, or nitrile compounds thereof, each of these components preferably being present in the copolymer to the maximum extent of about 20 mol-%.
Claim 9
Dependent Claim
47 words
A product as claimed in claim 1, wherein the units containing thermally corsslinked groups comprise N-methylol derivatives of (meth)acrylamide, maleic monoamide or maleic diamide and/or of the amides of fumaric acid or itaconic acid, the N-methylol group being optionally etherified by a (C 1 -C 4 )-alkanol.
Claim 10
Dependent Claim
30 words
A product as claimed in claim 1, wherein the proportion of the component made from units containing thermally crosslinked groups in the copolymer is from about 0.5 to 20 mol-%.
Claim 11
Dependent Claim
25 words
A product as claimed in claim 1, wherein the proportion of primary plasticizer, relative to the cellulose, is from about 1 to 100% by weight.
Claim 12
Dependent Claim
12 words
A product as claimed in claim 1, further comprising a secondary plasticizer.
Claim 13
Dependent Claim
13 words
A product as claimed in claim 11, wherein said secondary plasticizer comprises glycerol.
Claim 14
Dependent Claim
27 words
A product as claimed in claim 1, wherein said sausage casing further comprises a synthetic resin coating on at least one of its inside and outside surfaces.
Claim 15
Dependent Claim
18 words
A sausage product comprising a sausage meat filling surrounded by a sausage casing as defined by claim 1.
Claim 16
Dependent Claim
49 words
A product as claimed in claim 7, wherein the copolymer contains units selected from vinyl acetate, vinyl ethyl ether, styrene, vinyltoluene, ethylene, butadiene, methacrylic acid, acrylic acid and the amides thereof, the monoesters and diesters thereof with (C 2 -C 6 )-alkylenediols or -alkanols and/or the nitrile compounds thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-02 | 1993-04-03 | 1993-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-02 | 1997-04-03 | 1997-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-02 | 2001-04-03 | 2001-10-03 | $7700.00 | Window Closed / Lapsed |