US4017452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer modified hydrophilic inorganic fillers for thermoplastic polymeric materials
Assignee: Presto Products Inc
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Filing: 1975-04-30
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Granted: 1977-04-12
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Expires: 1995-04-30
Abstract
Abstract Normally hydrophilic inorganic fillers for polymeric resins are modified to enhance their dispersibility in such resins by admixing filler particles with a block copolymer of ethylene oxide and propylene oxide under shear and at an elevated temperature so as to coat the filler particles with a portion of the block copolymer. Thermoplastic polymeric resins, such as polyethylene and polypropylene, containing thus-modified fillers can be conventionally formed into products, such as thin film bags, having improved strength properties.
Inventors
- 👤 Eckhard C. A. Schwarz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:53
CPC Classifications
C; C09; C09C; C09C3/00; C09C3/10; C08; C08K; C08K9/00; C08K9/10; C01; C01P; C01P2004/00; C01P2004/10; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/80; C01P2006/90; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2998; Y10T428/30
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
154 words
A method for preparing an inorganic filler which is dispersible in a thermoplastic polymeric resin comprising the steps of admixing particles of an inorganic filler having a hydrophilic surface with an aqueous wetting angle of less than 50° with a block copolymer having an A-B-A structure with the A units being a homopolymer of ethylene oxide, the B unit being a homopolymer of propylene oxide, and a mole ratio of ethylene oxide to propylene oxide within the range of 40:60 to 90:10 and having an average molecular weight of at least 3,000, the amount of said filler being within the range of about 5 to about 95 weight %, based on the total weight of said admixture; compounding said admixture under shear at a temperature of at least 80° C for a time period sufficient to coat said filler particles with said copolymer; cooling the resulting compound until solidified; and comminuting said solidified compound.
Claim 2
Independent Claim
154 words
A method for preparing an inorganic filler which is dispersible in a thermoplastic polymeric resin comprising the steps of admixing particles of an inorganic filler having a hydrophilic surface with an aqueous wetting angle of less than 50° with a block copolymer having an A-B-A structure with the A units being a homopolymer of ethylene oxide, the B unit being a homopolymer of propylene oxide, and a mole ratio of ethylene oxide to propylene oxide within the range of 40:60 to 90:10 and having an average molecular weight of at least 3,000, the amount of said filler being within the range of about 5 to about 95 weight %, based on the total weight of said admixture; compounding said admixture under shear at a temperature of at least 80° C for a time period sufficient to coat said filler particles with said copolymer; cooling the resulting compound until solidified; and comminuting said solidified compound.
Claim 3
Dependent Claim
32 words
A method according to claim 1 wherein said copolymer has the following formula: ##STR2##where x and z are integers of at least 10 and y is an integer of at least 20.
Claim 4
Dependent Claim
26 words
A method according to claim 1 wherein the mole ratio of ethylene oxide to propylene oxide is within the range of about 60:40 to about 80:20.
Claim 5
Dependent Claim
35 words
A method according to claim 1 wherein said filler is selected from the group consisting of kaolin clay, titanium dioxide, barium sulfate, calcium sulfate, calcium carbonate, magnesium silicate, zinc oxide, diatomaceous earth and mixtures thereof.
Claim 6
Dependent Claim
12 words
A method according to claim 4 wherein said filler is kaolin clay.
Claim 7
Dependent Claim
27 words
A method according to claim 1 wherein the amount of said filler in said admixture is within the range of about 10 to about 50 weight %.
Claim 8
Dependent Claim
149 words
An article formed from a thermoplastic composition containing a polyolefinic resin and about 1 to about 30 weight % of a modified filler prepared by admixing particles of an inorganic filler having a hydrophilic surface with an aqueous wetting angle of less than 50° with a block copolymer having an A-B-A structure with the A units being the homopolymer of ethylene oxide, the B unit being a homopolymer of propylene oxide, and a mole ratio of ethylene oxide to propylene oxide within the range of 40:60 to 90:10 and having an average molecular weight of at least 3,000, the amount of said inorganic filler being within the range of about 5 to about 95 weight %, based on the total weight of said admixture, and compounding said admixture under shear temperature of at least 80° C for a time sufficient to coat said inorganic filler particles with said copolymer.
Claim 9
Dependent Claim
149 words
An article formed from a thermoplastic composition containing a polyolefinic resin and about 1 to about 30 weight % of a modified filler prepared by admixing particles of an inorganic filler having a hydrophilic surface with an aqueous wetting angle of less than 50° with a block copolymer having an A-B-A structure with the A units being the homopolymer of ethylene oxide, the B unit being a homopolymer of propylene oxide, and a mole ratio of ethylene oxide to propylene oxide within the range of 40:60 to 90:10 and having an average molecular weight of at least 3,000, the amount of said inorganic filler being within the range of about 5 to about 95 weight %, based on the total weight of said admixture, and compounding said admixture under shear temperature of at least 80° C for a time sufficient to coat said inorganic filler particles with said copolymer.
Claim 10
Dependent Claim
18 words
An article according to claim 7 wherein said article is a thin film extruded from said thermoplastic composition.
Claim 11
Dependent Claim
36 words
An article according to claim 8 wherein said copolymer coating said modified filler has the following formula: ##STR3##where x and z are integers of at least 10 and y is an integer of at least 20.
Claim 12
Dependent Claim
33 words
An article according to claim 8 wherein the mole ratio of ethylene oxide to propylene oxide in said copolymer coating said modified filler is within the range of about 60:40 to about 80:20.
Claim 13
Dependent Claim
40 words
An article according to claim 9 wherein said inorganic filler in said modified filler is selected from the group consisting of kaolin clay, titanium dioxide, barium sulfate, calcium sulfate, calcium carbonate, magnesium silicate, zinc oxide, diatomaceous earth and mixtures thereof.
Claim 14
Dependent Claim
17 words
An article according to claim 11 wherein said inorganic filler in said modified filler is kaolin clay.
Claim 15
Dependent Claim
29 words
An article according to claim 9 wherein the amount of said inorganic filler in said modified filler is within the range of about 10 to about 50 weight %.
Claim 16
Dependent Claim
26 words
An article according to claim 8 wherein said thermoplastic polyolefinic resin is a polyolefinic resin selected from the group consisting of polyethylene, polypropylene and copolymers thereof.
Claim 17
Dependent Claim
24 words
An article according to claim 14 wherein the concentration of said filler is within the range of about 5 to about 20 weight %.
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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) | 1980-04-11 | 1980-10-11 | 1981-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-11 | 1984-10-11 | 1985-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-11 | 1988-10-11 | 1989-04-12 | $7700.00 | Window Closed / Lapsed |