Patent US4165302A successfully refreshed from Google Patents.
US4165302A
Expired / Lapsed
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Filled resin compositions containing atactic polypropylene
Assignee: Cities Service Co
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Filing: 1978-08-22
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Granted: 1979-08-21
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Expires: 1998-08-22
Abstract
Abstract Filled thermoplastic compositions have a lower melt index than do the virgin resins, leading to problems in molding. The melt index of the filled resin can be raised by the addition of 3-12 wt.% atactic polypropylene.
Inventors
- 👤 Carmen F. Armenti
- 👤 James V. De Juneas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:18
CPC Classifications
C; C08; C08L; C08L57/00; C08K; C08K3/00; C08K3/01; C08K3/013; C08L1/00; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08L3/00; C08L97/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
69 words
A method of improving the melt index of a filled thermoplastic resin composition, said composition comprising (a) a basic resin selected from the group consisting of polyethylene, polypropylene (isotactic), polybutylene, copolymers of vinyl acetate and ethylene, polystyrene, and acrylic resins, and (b) a filler consisting from the group consisting of inorganic fillers and organic fillers, comprising adding a minor amount, based on the total finished composition, of atactic polypropylene.
Claim 2
Independent Claim
69 words
A method of improving the melt index of a filled thermoplastic resin composition, said composition comprising (a) a basic resin selected from the group consisting of polyethylene, polypropylene (isotactic), polybutylene, copolymers of vinyl acetate and ethylene, polystyrene, and acrylic resins, and (b) a filler consisting from the group consisting of inorganic fillers and organic fillers, comprising adding a minor amount, based on the total finished composition, of atactic polypropylene.
Claim 3
Dependent Claim
35 words
The method of claim 1, wherein (a) the amount of filled resin varies from about 88 to about 97 wt.% and (b) the amount of atactic polypropylene varies from about 3 to about 12 wt.%.
Claim 4
Dependent Claim
23 words
The method of claim 1, wherein the filled resin comprises about 50 to 95 wt.% resin and about 5 to 50 wt.% filler.
Claim 5
Dependent Claim
83 words
The method of claim 1, wherein (a) the organic filler is selected from group consisting of wood flour, peanut shells, cellulose, lignin, keratin, soy bean meal, cherry pit flour, and starch, (b) the inorganic filler is selected from the group consisting of calcium carbonate, clay, talc, wollastonite, silica, gypsum, mica, and fly ash, (c) the amount of filled resin is from 90-95 wt.%, and (d) the amount of atactic polypropylene is from 5 to 10 wt.%, based on the total finished resin composition.
Claim 6
Dependent Claim
16 words
The method of claim 1, wherein the atactic polypropylene is about 98 wt.% atactic in structure.
References Cited (Backward Citations)
GB927881A
Cited
US3745142A
Cited
US4166897A
Cited
US4094854A
Cited
US4078020A
Cited
US4088628A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-20 | 1983-02-19 | 1983-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-20 | 1987-02-19 | 1987-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-20 | 1991-02-19 | 1991-08-21 | $7700.00 | Window Closed / Lapsed |