US3878137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Curable molding compositions based on unsaturated polyesters and containing acid cellulose esters and polystyrene
Assignee: Bayer AG
•
Filing: 1973-09-13
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Granted: 1975-04-15
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Expires: 1993-09-13
Abstract
Abstract The invention relates to moulding compositions based on olefinically unsaturated polyesters, containing acid cellulose esters and polystyrene, which can be cured to give homogeneously coloured mouldings of low shrinkage.
Inventors
- 👤 Bernhard Hess
- 👤 Karl Raichle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:41
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
90 words
A CURABLE MOULDING COMPOSITION COMPRISING 20-50% BY WEIGHT OF AN UNSATURATED POLYESTER OF AN A,B-UNSATURATED DICARBOXYLIC ACID AND A PHENOL; 40-60% BY WEIGHT OF A COPOLYMERIZBLE VINYL MONOMER; A POLYMERIZATION INHIBITOR; A PIGMENT; A POLYMERIZATION INITIATOR; 5-30% BY WEIGHT OF AN ACID CELLULOSE ESTER SELECTED FROM THE GROUP CONSISTING OF ACID CELLULOSE ACETOBUTYRATE AND ACID CELLULOSE ACETOPROPIONATE, EACH SAID ACID CELLULOSE CONTAINING CARBOXYLIC ACID GROUPS, AND 1-15% BY WEIGHT OF POLYSTYRENE, SAID PERCENTAGES BY WEIGHT BEING BASED ON THE TOTAL WEIGHT OF THE COMPOSITION MINUS THE WEIGHT OF SAID PIGMENT.
Claim 2
Dependent Claim
90 words
A CURABLE MOULDING COMPOSITION COMPRISING 20-50% BY WEIGHT OF AN UNSATURATED POLYESTER OF AN A,B-UNSATURATED DICARBOXYLIC ACID AND A PHENOL; 40-60% BY WEIGHT OF A COPOLYMERIZBLE VINYL MONOMER; A POLYMERIZATION INHIBITOR; A PIGMENT; A POLYMERIZATION INITIATOR; 5-30% BY WEIGHT OF AN ACID CELLULOSE ESTER SELECTED FROM THE GROUP CONSISTING OF ACID CELLULOSE ACETOBUTYRATE AND ACID CELLULOSE ACETOPROPIONATE, EACH SAID ACID CELLULOSE CONTAINING CARBOXYLIC ACID GROUPS, AND 1-15% BY WEIGHT OF POLYSTYRENE, SAID PERCENTAGES BY WEIGHT BEING BASED ON THE TOTAL WEIGHT OF THE COMPOSITION MINUS THE WEIGHT OF SAID PIGMENT.
Claim 3
Dependent Claim
22 words
The composition of claim 1 wherein said at least one acid cellulose ester is present in an amount of 10-20% by weight.
Claim 4
Dependent Claim
26 words
The composition of claim 1 wherein said polystyrene has been produced in the presence of said at least one acid cellulose ester in a styrene solution.
Claim 5
Dependent Claim
16 words
The composition of claim 1 wherein said polystyrene has a molecular weight of 5,000 to 10,000,000.
Claim 6
Dependent Claim
63 words
The composition of claim 1 wherein said polystyrene is a copolymer of styrene and a minor amount of at least one monomer selected from the group consisting of Alpha -methylstyrene, vinyltoluene, tert.-butylstyrene, chlorostyrene, butadiene, acrylic acid, methacrylic acid, the esters and amides of said acids, hydroxypropylmethacrylate, Beta -methacryloxyethylsulfonic acid, Beta -methacryloxyphosphoric acid and the neutral and acid esters of maleic and fumaric acids.
Claim 7
Dependent Claim
32 words
The composition of claim 1 wherein said at least one acid cellulose ester is acetobutyrate containing 17-21% of acetic acid and 45-50% of butyric acid and having an acid number of 10-80.
Claim 8
Dependent Claim
26 words
The composition of claim 1 including a chemical thickener which is an oxide or a hydroxide of a metal of Group II of the Periodic System.
Claim 9
Dependent Claim
10 words
The composition of claim 1 which includes an inert filler.
Claim 10
Dependent Claim
15 words
The method of producing a hardened composition which comprises curing the composition of claim 1.
Claim 11
Dependent Claim
10 words
The hardened composition produced by the method of claim 9.
References Cited (Backward Citations)
US3642672A
Cited
US3772241A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |