Patent US4280937A successfully refreshed from Google Patents.
US4280937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graft polymers of polysaccharide esters
Assignee: Bayer AG
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Filing: 1979-09-25
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Granted: 1981-07-28
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Expires: 1999-09-25
Abstract
Abstract Graft copolymers of A 2 to 30% by weight of a polysaccharide ester as graft basis, and B 98 to 70% by weight of a grafted monomer mixture of (1) 8 to 90% by weight of ethylene and (2) 92 to 10% by weight of vinyl acetate. The polymers are suitable for the production of moulding compounds, films, packaging foils, and coatings.
Inventors
- 👤 Herbert Bartl
- 👤 Fritz Mietzsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:44
CPC Classifications
C; C08; C08F; C08F251/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
49 words
A graft copolymer comprising (A) 2 to 30% by weight of a polysaccharide ester as grafting substrate and (B) 98 to 70% by weight of a mixture of (1) 8 to 90% by weight of ethylene and (2) 92 to 10% by weight of vinyl acetate as grafting monomers.
Claim 2
Dependent Claim
49 words
A graft copolymer comprising (A) 2 to 30% by weight of a polysaccharide ester as grafting substrate and (B) 98 to 70% by weight of a mixture of (1) 8 to 90% by weight of ethylene and (2) 92 to 10% by weight of vinyl acetate as grafting monomers.
Claim 3
Dependent Claim
63 words
A graft copolymer of claim 1 comprising (A) 5 to 25% by weight of a cellulose ester of an aliphatic carboxylic acid having 2 to 4 carbon atoms as grafting substrate and (B) 95 to 75% by weight of a mixture of (1) 20 to 75% by weight of ethylene and (2) 80 to 25% by weight of vinyl acetate as grafting monomers.
Claim 4
Dependent Claim
11 words
A graft copolymer of claim 1 wherein (A) is cellulose proprionate.
Claim 5
Dependent Claim
11 words
A graft copolymer of claim 1 wherein (A) is cellulose acetobutyrate.
Claim 6
Dependent Claim
42 words
A graft copolymer of claim 1 wherein said grafting monomers include at least one monomer selected from the group consisting of carbon monoxide, (meth) acrylic acid, acrylic acid and C 1 to C 8 alkyl esters of (meth) acrylic and acrylic acids.
Claim 7
Dependent Claim
22 words
A graft copolymer of claim 1 prepared by solution polymerization in tertiary butanol at a temperature of from 50° to 100° C.
Claim 8
Dependent Claim
39 words
A process for producing a graft copolymer of claim 1 wherein the polysaccharide ester is dissolved in vinyl acetate, ethylene is added and polymerization is continuously carried out at elevated pressure in the presence of a radical forming substance.
Claim 9
Dependent Claim
9 words
A foil of the graft copolymer of claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-27 | 1985-01-26 | 1985-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-27 | 1989-01-26 | 1989-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-27 | 1993-01-26 | 1993-07-28 | $7700.00 | Window Closed / Lapsed |