US5087654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polypropylene resin composition
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1990-02-12
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Granted: 1992-02-11
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Expires: 2010-02-12
Abstract
Abstract Disclosed is a polypropylene resin composition which is superior in mechanical strength and affords molded articles having good appearance which comprises (A) a crystalline polypropylene, (B) a polypropylene modified with an unsaturated carboxylic acid or an acid anhydride thereof, and (C) a zinc oxide whiskers. When the composition additionally contains an inorganic filler such as glass fibers, molded articles further improved in appearance can be obtained. The zinc oxide whiskers preferably have a tetrapod type crystal structure.
Inventors
- 👤 Hiroyuki Harada
- 👤 Kenichi Ohkawa
- 👤 Masashi Yamamoto
- 👤 Minoru Yoshinaka
- 👤 Jun Yagi
- 👤 Kouziro Matsuo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:12
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08K; C08K7/00; C08K7/02; C08K7/04; C08K7/08; C08L23/12; C08L23/14; C08L23/142; C08K7/14; C08L51/00; C08L51/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
47 words
A polypropylene resin composition which comprises 45-85% by weight of (A) a crystalline polypropylene, 10-20% by weight of (B) a polypropylene modified with an unsaturated carboxylic acid or an acid anhydride thereof, and 5-35% by weight of (C) zinc oxide whiskers which have a tetrapod-formed crystal structure.
Claim 2
Dependent Claim
47 words
A polypropylene resin composition which comprises 45-85% by weight of (A) a crystalline polypropylene, 10-20% by weight of (B) a polypropylene modified with an unsaturated carboxylic acid or an acid anhydride thereof, and 5-35% by weight of (C) zinc oxide whiskers which have a tetrapod-formed crystal structure.
Claim 3
Dependent Claim
82 words
A polypropylene resin composition which comprises 45-85% by weight of (A) a crystalline polypropylene, 10-20% by weight of (B) a polypropylene modified with an unsaturated carboxylic acid or an acid anhydride thereof, 5-35% by weight of (C) zinc oxide whiskers which have tetrapod-formed crystal structure, and 40% or less by weight, based on (C), of an inorganic filler (D) selected from the group consisting of glass fibers, talc and mica, the sum of (C) and (D) being 45% or less by weight.
Claim 4
Dependent Claim
82 words
A polypropylene resin composition which comprises 45-85% by weight of (A) a crystalline polypropylene, 10-20% by weight of (B) a polypropylene modified with an unsaturated carboxylic acid or an acid anhydride thereof, 5-35% by weight of (C) zinc oxide whiskers which have tetrapod-formed crystal structure, and 40% or less by weight, based on (C), of an inorganic filler (D) selected from the group consisting of glass fibers, talc and mica, the sum of (C) and (D) being 45% or less by weight.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-02-10 | 1995-08-12 | 1996-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-10 | 1999-08-12 | 2000-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-10 | 2003-08-12 | 2004-02-11 | $7700.00 | Window Closed / Lapsed |