US4315880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of fibrous products
Assignee: Shell USA Inc
•
Filing: 1980-05-01
•
Granted: 1982-02-16
•
Expires: 2000-05-01
Abstract
Abstract Process for the manufacture of fibrous products by drawing at elevated temperature a sheet comprising sintered particles of a synthetic organic thermoplastic polymer, which sheet also contains 0.1 to 5 phr of a processing aid, being certain fatty acids or compounds thereof.
Inventors
- 👤 Uiltje J. Veenstra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:32
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4382; D01; D01D; D01D5/00; D01D5/42; D04H13/00; Y; Y10; Y10S; Y10S264/00; Y10S264/47
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
161 words
In the process for the manufacture of fibrous particles which comprises depositing on a surface a layer of powdery particles consisting at least to the extent of 50% by weight of thermoplastic resin and containing between 15 and 50 phr of a particulate inorganic filler having particle diameters in the range from 0.1 to 20 μm, maintaining the layer under sufficient heat for a sufficient length of time to form a sheet of partly fused particles, and drawing the sheet to convert it to a uniform fibrous web, the improvement of including in said layer from 0.1 to 5 phr of a compound (R'--COO) n R 2 in which n has a value 1, 2 or 3, sufficient to satisfy the valence of R 2 , R' is an aliphatic hydrocarbon group of 10 to 20 carbon atoms, and R 2 is a hydrogen atom or an atom of an alkali metal, alkaline earth metal or aluminum, or an organic radical.
Claim 2
Dependent Claim
161 words
In the process for the manufacture of fibrous particles which comprises depositing on a surface a layer of powdery particles consisting at least to the extent of 50% by weight of thermoplastic resin and containing between 15 and 50 phr of a particulate inorganic filler having particle diameters in the range from 0.1 to 20 μm, maintaining the layer under sufficient heat for a sufficient length of time to form a sheet of partly fused particles, and drawing the sheet to convert it to a uniform fibrous web, the improvement of including in said layer from 0.1 to 5 phr of a compound (R'--COO) n R 2 in which n has a value 1, 2 or 3, sufficient to satisfy the valence of R 2 , R' is an aliphatic hydrocarbon group of 10 to 20 carbon atoms, and R 2 is a hydrogen atom or an atom of an alkali metal, alkaline earth metal or aluminum, or an organic radical.
Claim 3
Dependent Claim
50 words
Process according to claim 1 wherein said thermoplastic resin is polypropylene; said compound (R 1 --COO) n R 2 is present in an amount in the range from 0.2 to 5 phr; R 1 is an alkyl radical and R 2 is an alkali metal, alkaline earth metal or aluminum.
Claim 4
Dependent Claim
16 words
Process according to claim 3 wherein R 1 is the undecyl, tridecyl, pentadecyl or heptadecyl group.
Claim 5
Dependent Claim
18 words
Process according to claim 2 wherein R 1 is heptadecyl and R 2 is hydrogen, calcium or aluminum.
Claim 6
Dependent Claim
111 words
In the process for the manufacture of fibrous articles which comprises depositing on a surface a layer of powdery particles consisting of at least to the extent of 50% by weight of polypropylene having particle diameters in the range from 5 to 100 μm and from 15 to 50 phr of barium sulfate having particle diameters in the range from 0.1 to 20 μm, maintaining the layer under sufficient heat for a sufficient length of time to form a sheet of partly fused particles and drawing the sheet to convert it to a uniform fibrous web, the improvement of including in said layer from 0.2 to 5 phr of calcium stearate.
Claim 7
Dependent Claim
111 words
In the process for the manufacture of fibrous articles which comprises depositing on a surface a layer of powdery particles consisting of at least to the extent of 50% by weight of polypropylene having particle diameters in the range from 5 to 100 μm and from 15 to 50 phr of barium sulfate having particle diameters in the range from 0.1 to 20 μm, maintaining the layer under sufficient heat for a sufficient length of time to form a sheet of partly fused particles and drawing the sheet to convert it to a uniform fibrous web, the improvement of including in said layer from 0.2 to 5 phr of calcium stearate.
References Cited (Backward Citations)
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Cited
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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) | 1985-02-15 | 1985-08-17 | 1986-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-15 | 1989-08-17 | 1990-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-15 | 1993-08-17 | 1994-02-16 | $7700.00 | Window Closed / Lapsed |