Patent US4003556A successfully refreshed from Google Patents.
Patent US4987170A successfully refreshed from Google Patents.
US4987170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Styrene resin composition excellent in sliding properties
Assignee: Mitsui Toatsu Chemicals Inc
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Filing: 1989-09-08
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Granted: 1991-01-22
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Expires: 2009-09-08
Abstract
Abstract A styrene resin composition excellent in sliding properties which comprises 100 parts by weight of a styrene polymer, 2.0 to 4.0 parts by weight of dimethylsilicone oil having a viscosity ranging from 5,000 to 15,000 centistokes at 25° C. and 0.05 to 8 parts by weight of maleic anhydride monomer or 0.05 to 50 parts by weight of a maleic anhydride-styrene copolymer containing at least 5% by weight of maleic anhydride monomer units is herein disclosed. The styrene resin composition is excellent in sliding properties and thus does not provide a molded product having poor appearance during molding. The styrene resin composition is used to form mechanical parts in the fields of household appliances and office automation apparatuses.
Inventors
- 👤 Yuzuru Ishida
- 👤 Masahiro Mitsuboshi
- 👤 Haruo Inoue
- 👤 Ichiro Otsuka
- 👤 Keiji Iio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:37
CPC Classifications
C; C08; C08L; C08L25/00; C08L25/02; C08L25/04; C08L51/00; C08L51/04; C08K; C08K5/00; C08K5/04; C08K5/15; C08K5/151; C08K5/1535; C08K5/1539; C08K5/54; C08K5/541; C08K5/5415; C08K5/5419; C08L35/00; C08L35/06; C08L83/00; C08L83/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
73 words
A styrene type resin composition excellent in sliding properties which comprises 100 parts by weight of a styrene polymer, 2.0 to 4.0 parts by weight of dimethylsilicone oil having a viscosity ranging from 5,000 to 15,000 centistokes at 25 and 0.05 to 8 parts by weight of maleic anhydride monomer or 0.05 to 50 parts by weight of a maleic anhydride-styrene copolymer containing at least 5% by weight of maleic anhydride monomer units.
Claim 2
Dependent Claim
73 words
A styrene type resin composition excellent in sliding properties which comprises 100 parts by weight of a styrene polymer, 2.0 to 4.0 parts by weight of dimethylsilicone oil having a viscosity ranging from 5,000 to 15,000 centistokes at 25 and 0.05 to 8 parts by weight of maleic anhydride monomer or 0.05 to 50 parts by weight of a maleic anhydride-styrene copolymer containing at least 5% by weight of maleic anhydride monomer units.
Claim 3
Dependent Claim
31 words
A composition as set forth in claim 1 wherein the content of dimethylsilicone oil ranges from 2.5 to 3.0 parts by weight per 100 parts by weight of the styrene polymer.
Claim 4
Dependent Claim
22 words
A composition as set forth in claim 1 wherein the viscosity of dimethylsilicone oil at 25° ranges from 10,000 to 13,000 centistokes.
Claim 5
Dependent Claim
33 words
A composition as set forth in claim 1 wherein the content of the maleic anhydride monomer ranges from 0.1 to 2 parts by weight per 100 parts by weight of the styrene polymer.
Claim 6
Dependent Claim
33 words
A composition as set forth in claim 1 wherein the content of the maleic anhydride-styrene copolymer ranges from 0.5 to 10 parts by weight per 100 parts by weight of the styrene polymer.
Claim 7
Dependent Claim
17 words
A composition as set forth in claim 1 wherein the styrene polymer is a rubber-modified styrene resin.
Claim 8
Dependent Claim
32 words
A composition as set forth in claim 6 wherein the rubber-modified styrene type resin includes a rubber-like polymer selected from polybutadiene, styrenebutadiene copolymer, butadiene-acrylonitrile copolymer, ethylene-propylene-diene terpolymers, butadiene-acrylate copolymers and mixtures thereof.
Claim 9
Dependent Claim
32 words
A composition as set forth in claim 1 wherein the styrene polymer is a polymer derived from at least one of styrene, alpha alkyl substituted styrene, alkyl substituted styrene, and halogenated styrene.
Claim 10
Dependent Claim
24 words
A composition as set forth in claim 8 wherein the styrene polymer is a polymer derived from at least one of styrene and alpha-methylstyrene.
References Cited (Backward Citations)
JPS6239610A
Cited
JPS63182361A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-01-21 | 1994-07-23 | 1995-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-21 | 1998-07-23 | 1999-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-21 | 2002-07-23 | 2003-01-22 | $7700.00 | Window Closed / Lapsed |