US4004940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pigmentation of polymers
Assignee: Celanese Canada Inc
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Filing: 1975-01-13
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Granted: 1977-01-25
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Expires: 1995-01-13
Abstract
Abstract There is provided an improved polypropylene/pigment concentrate for use in preparing pigmented fibers. The improvement comprises at least 95 weight percent of the polypropylene particles have a maximum chord of less than 50 microns. Fibers prepared from concentrates containing 10-75% by weight of pigment have improved color, fewer pigment agglomerates and fewer broken filaments.
Inventors
- 👤 Claude Cormier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:53
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/22; C08J3/226; C08J2323/00; C08J2323/02; C08J2323/10; C08J2323/12; C08J2423/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
67 words
An improved polypropylene/pigment essentially dry-blended concentrate being a blend of isotactic polypropylene particles and at least one pigment coated on the particles, and wherein said pigment's concentration is 10-75% by weight, wherein the improvement comprises: at least 95 weight percent of said polypropylene particles have a maximum chord of less than 50 microns, whereby fibers made therefrom have improved color, fewer pigment agglomerates and fewer broken filaments.
Claim 2
Dependent Claim
67 words
An improved polypropylene/pigment essentially dry-blended concentrate being a blend of isotactic polypropylene particles and at least one pigment coated on the particles, and wherein said pigment's concentration is 10-75% by weight, wherein the improvement comprises: at least 95 weight percent of said polypropylene particles have a maximum chord of less than 50 microns, whereby fibers made therefrom have improved color, fewer pigment agglomerates and fewer broken filaments.
Claim 3
Dependent Claim
24 words
The concentrate of claim 1 wherein at least 90 weight percent of said polypropylene particles have a maximum chord of less than 25 microns.
Claim 4
Dependent Claim
13 words
The concentrate of claim 2 wherein said pigment's concentration is 25-50% by weight.
Claim 5
Dependent Claim
13 words
The concentrate of claim 1 wherein said polypropylene particles have smooth unfissured surfaces.
Claim 6
Dependent Claim
11 words
The concentrate of claim 4 wherein said particles are screened particles.
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) | 1980-01-25 | 1980-07-26 | 1981-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-25 | 1984-07-26 | 1985-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-25 | 1988-07-26 | 1989-01-25 | $7700.00 | Window Closed / Lapsed |