Patent US4420580A successfully refreshed from Google Patents.
US4420580A
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US
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Method for preparing filled polyolefin resins and the resin made therefrom
Assignee: Dow Chemical Co
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Filing: 1982-02-08
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Granted: 1983-12-13
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Expires: 2002-02-08
Abstract
Abstract The detrimental effect of inorganic metal fillers on impact strength of polyolefin resins is substantially reduced by the addition of a copolymer of ethylene and an alpha-, beta-ethylenically unsaturated carboxylic acid, such as ethylene-acrylic acid, to a melt blend of the polyolefin resin containing the inorganic filler. The addition of the ethylene copolymer provides an effective means to compatibilize or couple the filler into the polyolefin resin.
Inventors
- 👤 Jim T. Herman
- 👤 Kenneth L. Bryce
- 👤 Gerald M. Lancaster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:58
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K3/24; C08K3/26; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L23/08; C08L23/0846; C08L23/0869; C08L23/10; C08L2207/00; C08L2207/06; C08L2207/062
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
70 words
A method of preparing filled polyolefin resins which consisting essentially of forming a melt of a polyolefin resin; blending into the melt an inorganic metal filler which is any polyvalent inorganic metal oxide, hydroxide or salt which reacts with the acid moiety of an ethylene-acid copolymer and a copolymer of ethylene and an alpha-, beta-ethylenically unsaturated carboxylic acid; and solidifying the resultant melt blend to form a filled polyolefin resin.
Claim 2
Independent Claim
70 words
A method of preparing filled polyolefin resins which consisting essentially of forming a melt of a polyolefin resin; blending into the melt an inorganic metal filler which is any polyvalent inorganic metal oxide, hydroxide or salt which reacts with the acid moiety of an ethylene-acid copolymer and a copolymer of ethylene and an alpha-, beta-ethylenically unsaturated carboxylic acid; and solidifying the resultant melt blend to form a filled polyolefin resin.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein the polyolefin is an ethylene or propylene homopolymer or copolymer.
Claim 4
Dependent Claim
26 words
The method of claim 1 wherein the filler is an oxide, carbonate, or hydroxide of the Group II metals of the periodic table of the elements.
Claim 5
Dependent Claim
22 words
The method of claim 1 wherein the copolymer is ethylene-acrylic acid containing from about 2.5 to about 20 weight percent acrylic acid.
Claim 6
Dependent Claim
78 words
A filled polyolefin resin composition formed by the process of claim 1 wherein, based on the total weight of the composition, the inorganic filler is present in an amount of from about 1 to about 60 weight percent, the copolymer is present in an amount of from about 0.5 to about 30 percent, and the balance a polyolefin, wherein the total amount of particulate and copolymer is within the range of from about 5 to about 60 percent.
Claim 7
Dependent Claim
22 words
The composition of claim 5 wherein the copolymer is ethylene-acrylic acid containing from about 2.5 to about 20 weight percent acrylic acid.
Claim 8
Dependent Claim
25 words
The composition of claim 5 wherein the filler is an oxide, carbonate, or hydroxide of the Group II metals of the periodic table of elements.
Claim 9
Independent Claim
68 words
A method of reducing a loss in impact strength of a polyolefin resin filled with an inorganic metal filler which is any polyvalent inorganic metal oxide, hydroxide or salt which reacts with the acid moiety of an ethylene-acid copolymer which comprises incorporating a copolymer of ethylene and an alpha-, beta-ethylenically unsaturated carboxylic acid into a melt blend consisting essentially of of the polyolefin and the inorganic metal filler.
Claim 10
Independent Claim
68 words
A method of reducing a loss in impact strength of a polyolefin resin filled with an inorganic metal filler which is any polyvalent inorganic metal oxide, hydroxide or salt which reacts with the acid moiety of an ethylene-acid copolymer which comprises incorporating a copolymer of ethylene and an alpha-, beta-ethylenically unsaturated carboxylic acid into a melt blend consisting essentially of of the polyolefin and the inorganic metal filler.
Claim 11
Dependent Claim
11 words
The method of claim 8 wherein the copolymer is ethylene-acrylic acid.
Claim 12
Dependent Claim
25 words
The method of claim 1 wherein the polyolefin is selected from the group consisting of ethylene homopolymers, polypropylene, linear low density polyethylenes and mixtures thereof.
Claim 13
Dependent Claim
25 words
The method of claim 10 wherein the inorganic metal filler is an oxide, carbonate or hydroxide of a Group II metal of the periodic table.
Claim 14
Dependent Claim
22 words
The method of claim 11 wherein the copolymer is ethylene-acrylic acid containing from about 2.5 to about 20 weight percent acrylic acid.
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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) | 1986-12-12 | 1987-06-13 | 1987-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-12 | 1991-06-13 | 1991-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-12 | 1995-06-13 | 1995-12-13 | $7700.00 | Window Closed / Lapsed |