US5213733A
Expired / Lapsed
US
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Method of making synthetic fibers containing photochromic pigment
Assignee: Industrial Technology Research Institute
•
Filing: 1991-06-03
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Granted: 1993-05-25
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Expires: 2011-06-03
Abstract
Abstract Synthetic textiles containing a photochromic pigment. The pigments are prepared by encapsulating a photochromic pigment in a thermoplastic polymer having a high melt flow index, mixed with a primary thermoplastic resin, and extruded at a temperature of less than 250 DEG C. through a spinnerette having a diameter of at least 0.3 ml.
Inventors
- 👤 Yean-Rong Hwu
- 👤 Chi-Chung Bai
- 👤 Li-Chang Tao
- 👤 Der-Guey Luo
- 👤 Andrew T. Hu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:27
CPC Classifications
D; D01; D01F; D01F1/00; D01F1/02; D01F1/04; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2927; Y10T428/2982; Y10T428/2991
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
77 words
A process for the preparation of a synthetic fiber containing a photochromic pigment which comprises: admixing (a) a photochromic pigment which is encapsulated in a thermoplastic polymer having a high melt-flow index and (b) a primary thermoplastic resin having a melting point of less then 215° C.; and extruding said admixture at a temperature of less than 250° C. through a spinneret having a diameter of at least 0.3 mm so as to form said synthetic fiber.
Claim 2
Dependent Claim
77 words
A process for the preparation of a synthetic fiber containing a photochromic pigment which comprises: admixing (a) a photochromic pigment which is encapsulated in a thermoplastic polymer having a high melt-flow index and (b) a primary thermoplastic resin having a melting point of less then 215° C.; and extruding said admixture at a temperature of less than 250° C. through a spinneret having a diameter of at least 0.3 mm so as to form said synthetic fiber.
Claim 3
Dependent Claim
32 words
The process of claim 1 wherein the photochromic pigment has the formula ##STR3## where R 1 , R 2 , R 3 and R 4 are each either hydrogen, halogen or hydrocarbyl.
Claim 4
Dependent Claim
19 words
The process of claim 2 wherein R 1 , R 2 , R 3 and R 4 are hydrogen.
Claim 5
Dependent Claim
15 words
The process of claim 1 wherein the encapsulating thermoplastic polymer is a low melting polyamide.
Claim 6
Dependent Claim
28 words
The process of claim 4 wherein the low melting polyamide is selected from the group consisting of nylon 8, nylon 12, nylon 6, nylon 66, and admixtures thereof.
Claim 7
Dependent Claim
13 words
The process of claim 1 wherein the encapsulating thermoplastic polymer is a polyolefin.
Claim 8
Dependent Claim
21 words
The process of claim 6 wherein the polyolefin is selected from the group consisting of polyethylene, polypropylene, and a blend thereof.
Claim 9
Dependent Claim
25 words
The process of claim 1 wherein the encapsulating thermoplastic polymer is selected from the group consisting of a low melting polyethylene terephthalate and polybutylene terephthalate.
Claim 10
Dependent Claim
25 words
The process of claim 1 wherein the primary thermoplastic resin is selected from the group consisting of a low melting polyamide, polyolefin, and polyalkylene terephthalate.
Claim 11
Dependent Claim
22 words
The process of claim 9 wherein the primary thermoplastic resin has a melt flow index ranging from 20 to 100 g/10 min.
Claim 12
Dependent Claim
25 words
The process of claim 1 wherein the photochromic pigment in the encapsulating thermoplastic polymer is in an amount ranging from 1 to 10% by weight.
Claim 13
Dependent Claim
18 words
The process of claim 1 wherein the synthetic fiber contains from 1% to 10% of the photochromic pigment.
Claim 14
Dependent Claim
27 words
The process of claim 1 wherein the ratio of the photochromic pigment encapsulated in a thermoplastic polymer to the primary thermoplastic resin ranges from 1:2 to 1:100.
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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) | 1996-05-24 | 1996-11-23 | 1997-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-24 | 2000-11-23 | 2001-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-24 | 2004-11-23 | 2005-05-25 | $7700.00 | Window Closed / Lapsed |