US4120844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molded calcium carbonate filled propylene resin composites
Assignee: Ford Motor Co
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Filing: 1977-03-09
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Granted: 1978-10-17
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Expires: 1997-03-09
Abstract
Abstract A method for increasing impact properties of calcium carbonate filled propylene resin composites, particularly impact properties at low temperatures, which comprises admixing critically sized particles of propylene homopolymer and copolymer resins and calcium carbonate filler to form uniform, preferably powdery, blends particularly suitable for such shaping operations as injection molding.
Inventors
- 👤 Fred J. Meyer
- 👤 Seymour Newman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:40
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/24; C08K3/26; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08L23/14
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
139 words
A method for increasing impact strength of calcium carbonate filled propylene resin composites which comprises (A) admixing with high intensity rotary blade mixing (1) propylene resins which pass through a 20 mesh screen but are retained on a 325 mesh screen with (2) calcium carbonate filler which passes through a 60 mesh screen and at least 80% by weight passes through a 325 mesh screen to form a uniformly or substantially uniformly mixed powdery blend at a weight ratio of (2):(1) being about 7:13-9:11, the calcium carbonate filler having a number average particle diameter greater than 10 millimicrons, wherein the propylene resins comprise propylene homopolymer and copolymer and (B) fusing the uniformly or substantially uniformly mixed powdery blend which consists essentially of the particles of the filler and the particles of the resin to form the high impact composites.
Claim 2
Independent Claim
139 words
A method for increasing impact strength of calcium carbonate filled propylene resin composites which comprises (A) admixing with high intensity rotary blade mixing (1) propylene resins which pass through a 20 mesh screen but are retained on a 325 mesh screen with (2) calcium carbonate filler which passes through a 60 mesh screen and at least 80% by weight passes through a 325 mesh screen to form a uniformly or substantially uniformly mixed powdery blend at a weight ratio of (2):(1) being about 7:13-9:11, the calcium carbonate filler having a number average particle diameter greater than 10 millimicrons, wherein the propylene resins comprise propylene homopolymer and copolymer and (B) fusing the uniformly or substantially uniformly mixed powdery blend which consists essentially of the particles of the filler and the particles of the resin to form the high impact composites.
Claim 3
Dependent Claim
19 words
A method according to claim 1 wherein the weight ration of propylene homopolymer to copolymer resin is about 1:2-2:1.
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) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |