US4551294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molding composition based on vinyl chloride polymers, and process for the manufacture of films from these molding compositions for the production of forgery-proof valuable documents
Assignee: Hoechst AG
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Filing: 1984-10-04
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Granted: 1985-11-05
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Expires: 2004-10-04
Abstract
Abstract The novel molding compositions with vinyl chloride polymer as the main constituent contain, in a specific quantity in each case, certain impact strength modifiers, polymethyl methacrylate and a special cellulose, namely powdered pure cellulose having a mean degree of polymerization of 300 to 1,000 and a maximum particle diameter of 0.09 mm. These molding compositions can readily be calendered. The films are particularly suitable for the production of forgery-proof valuable documents which can be personalized by means of a laser, for example credit cards.
Inventors
- 👤 Bernhard Wottka
- 👤 Alfred Weindl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:06
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/30; B29B7/34; B29B7/52; B29B7/56; B29B7/002; B29B7/007; B29C; B29C43/00; B29C43/003; B29C43/22; B29C43/24; C; C08; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; G; G06; G06K; G06K19/00; G06K19/06; G06K19/06009; G06K19/06046; B29K; B29K2027/00; B29K2027/06; B29K2105/00; B29K2105/06; B29K2105/16; B29L; B29L2007/00; C08L1/00; C08L1/02; C08L33/00; C08L33/04; C08L33/06; C08L33/10; C08L33/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
252 words
A molding composition based on vinyl chloride polymers, for the manufacture of films for the production of forgery-proof valuable documents, consisting essentially of A. 5 to 20% by weight of an impact strength modifier for vinyl chloride polymers, selected from the group comprising the acrylonitrile/butadiene/styrene polymers, methyl methacrylate/butadiene/styrene polymers, methyl methacrylate/acrylonitrile/butadiene/styrene polymers, each of said polymers having a butadiene content of at least about 35% by weight relative to the total polymer, and chlorinated ethylene polymer, said chlorinated ethylene polymer having a chlorine content of about 20 to 50% by weight relative to the chlorinated ethylene polymer and having a mean molecular weight of about 10,000 to 100,000 when calculated from the chlorine content and the molecular weight of the starting ethylene polymer as determined by gel chromotography; B. 0.5 to 25% by weight of powdered pure cellulose which has a mean degree of polymerization of 300 to 1,000 and the particles of which have a maximum diameter of 0.09 mm; C. 1 to 5% by weight of polymethyl methacrylate; and D. vinyl chloride polymer having at least about 70% by weight polymerized vinyl chloride units relative to the weight of the polymer, in such a quantity that the sum of the weights of said components A, B, C and D gives 100% by weight; and additionally E. about 0.1 to 2.5% by weight of lubricant and about 0.5 to 3% by weight of heat stabilizer for said vinyl chloride polymer, both relative to the quantity by weight of said component D.
Claim 2
Dependent Claim
252 words
A molding composition based on vinyl chloride polymers, for the manufacture of films for the production of forgery-proof valuable documents, consisting essentially of A. 5 to 20% by weight of an impact strength modifier for vinyl chloride polymers, selected from the group comprising the acrylonitrile/butadiene/styrene polymers, methyl methacrylate/butadiene/styrene polymers, methyl methacrylate/acrylonitrile/butadiene/styrene polymers, each of said polymers having a butadiene content of at least about 35% by weight relative to the total polymer, and chlorinated ethylene polymer, said chlorinated ethylene polymer having a chlorine content of about 20 to 50% by weight relative to the chlorinated ethylene polymer and having a mean molecular weight of about 10,000 to 100,000 when calculated from the chlorine content and the molecular weight of the starting ethylene polymer as determined by gel chromotography; B. 0.5 to 25% by weight of powdered pure cellulose which has a mean degree of polymerization of 300 to 1,000 and the particles of which have a maximum diameter of 0.09 mm; C. 1 to 5% by weight of polymethyl methacrylate; and D. vinyl chloride polymer having at least about 70% by weight polymerized vinyl chloride units relative to the weight of the polymer, in such a quantity that the sum of the weights of said components A, B, C and D gives 100% by weight; and additionally E. about 0.1 to 2.5% by weight of lubricant and about 0.5 to 3% by weight of heat stabilizer for said vinyl chloride polymer, both relative to the quantity by weight of said component D.
Claim 3
Dependent Claim
20 words
The molding composition as claimed in claim 1, in which the quantity of cellulose is 0.5 to 5% by weight.
Claim 4
Dependent Claim
55 words
The molding composition as claimed in claim 1, in which the quantity of cellulose is 8 to 25% by weight and which contains, as a component F, further fillers selected from the group comprising titanium dioxide and chalk in a quantity of 1 to 15% by weight, relative to the weight of vinyl chloride polymer.
Claim 5
Dependent Claim
97 words
A process for the manufacture of calendered films from the molding compositions as claimed in claim 1, which comprises pre-gelling the molding composition at a temperature from 150° to 170° C., and calendering the pre-gelled material on a calender comprising four or five calender rolls at a temperature from 190° to 210° C. to give a film, the rolls being heated individually in such a way that the first and last rolls have approximately the same temperature and the intervening rolls have temperatures which are 5° to 10° C. higher than those of the other two rolls.
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) | 1988-11-04 | 1989-05-06 | 1989-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-04 | 1993-05-06 | 1993-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-04 | 1997-05-06 | 1997-11-05 | $7700.00 | Window Closed / Lapsed |