US4435541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antistatic thermoplastic molding masses containing styrene-acrylonitrile grafted polyether
Assignee: DR BEACK & Co AG 105 GROSSMANNSTRASSE 2000 HAMBURG 28 GERMANY
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Filing: 1982-03-25
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Granted: 1984-03-06
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Expires: 2002-03-25
Abstract
Abstract Thermoplastic molding masses based on the copolymerization of styrene and/or α-methylstyrene and acrylonitrile, which may be modified to be impact resistant with rubberlike polymers, are made antistatic by adding 0.01 to 1.5 percent by weight of a graft polyol which is a polyhydroxy-polyalkylene polyether modified with styrene-acrylonitrile copolymers.
Inventors
- 👤 Franz Brandstetter
- 👤 Juergen Hambrecht
- 👤 Bernhard Scharf
- 👤 Gerhard Lindenschmidt
- 👤 Josef Schwaab
- 👤 Rudolf H. Jung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:17
CPC Classifications
C; C08; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/08; C08L25/12; C08L51/00; C08L51/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
79 words
An antistatic thermoplastic molding material comprising a copolymer of styrene and/or α-methylstyrene and acrylonitrile and, as an antistatic agent, from 0.01 percent by weight to 1.5 percent by weight of a graft polyol prepared by polymerization of a styrene-acrylonitrile mixture in a polyhydroxy polyalkylene polyether said polyether having a molecular weight of 500 to 10,000 and being obtained by the addition reaction of an alkylene oxide having 2 to 3 carbon atoms with a di- or trifunctional initiator molecule.
Claim 2
Dependent Claim
79 words
An antistatic thermoplastic molding material comprising a copolymer of styrene and/or α-methylstyrene and acrylonitrile and, as an antistatic agent, from 0.01 percent by weight to 1.5 percent by weight of a graft polyol prepared by polymerization of a styrene-acrylonitrile mixture in a polyhydroxy polyalkylene polyether said polyether having a molecular weight of 500 to 10,000 and being obtained by the addition reaction of an alkylene oxide having 2 to 3 carbon atoms with a di- or trifunctional initiator molecule.
Claim 3
Dependent Claim
46 words
The molding material of claim 1 wherein the antistatic agent is produced by polymerization of a mixture of 5 to 60 percent by weight of styrene/acrylonitrile in a weight ratio of 90:10 to 30:70 and 40 to 95 percent by weight of a polyhydroxyl polyalkylene polyether.
Claim 4
Dependent Claim
29 words
The molding material of claim 1 wherein the copolymer is styrene and/or α-methylstyrene and 8 to 50 percent by weight of acrylonitrile based on the weight of the copolymer.
Claim 5
Dependent Claim
23 words
The molding materials of claim 1 wherein the copolymer is styrene and/or α-methylstyrene and acrylonitrile modified to be impact resistant with rubberlike polymers.
Claim 6
Dependent Claim
42 words
The process of suppressing dust accumulation which comprises incorporating in a thermoplastic molding material based on a copolymer of styrene and/or α-methylstyrene and acrylonitrile from 0.01 percent by weight to 1.5 percent by weight of an antistatic agent according to claim 1.
Claim 7
Dependent Claim
22 words
The process of claim 5 wherein the copolymer of styrene and/or α-methylstyrene and acrylonitrile is impact resistance modified with a rubberlike polymer.
Claim 8
Dependent Claim
13 words
The antistatic thermoplastic molding material of claim 1 which further contains an antioxidant.
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) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |