US4008044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of polyester textiles to improve soil release and wettability properties
Assignee: JP Stevens and Co Inc
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Filing: 1975-06-03
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Granted: 1977-02-15
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Expires: 1995-06-03
Abstract
Abstract This invention relates to a process for improving the soil release and wetting properties of a polyester textile material by applying thereto a limited amount of an aqueous solution containing about 0.5 to 2.5% by weight of sodium hydroxide and then contacting the textile material with steam while maintaining a moisture content of at least 35% to remove 0.4 to 2.5% by weight of the polyester. By using this procedure the amount of polyester removed is controlled by the limited amount of sodium hydroxide present while at the same time a substantially uniform product is obtained.
Inventors
- 👤 Bruce M. Latta
- 👤 Ildo E. Pensa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:04
CPC Classifications
D; D06; D06M; D06M11/00; D06M11/32; D06M11/36; D06M11/38
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
117 words
A continuous process for imparting soil release properties to fabric consisting essentially of polyester, said process comprising A. applying to said fabric about 70 to 90% by weight based on the weight of said fabric of an aqueous solution containing 0.5 to 2.5% by weight of NaOH, B. contacting said fabric having said aqueous solution thereon with saturated steam for a period of 10 to 90 minutes while maintaining the moisture content of the fabric within the range of 35 to 120% by weight based on the weight of the fabric to remove about 0.4 to 2.5% by weight of the polyester in the fabric and C. washing said fabric with water to remove any unreacted NaOH.
Claim 2
Dependent Claim
117 words
A continuous process for imparting soil release properties to fabric consisting essentially of polyester, said process comprising A. applying to said fabric about 70 to 90% by weight based on the weight of said fabric of an aqueous solution containing 0.5 to 2.5% by weight of NaOH, B. contacting said fabric having said aqueous solution thereon with saturated steam for a period of 10 to 90 minutes while maintaining the moisture content of the fabric within the range of 35 to 120% by weight based on the weight of the fabric to remove about 0.4 to 2.5% by weight of the polyester in the fabric and C. washing said fabric with water to remove any unreacted NaOH.
Claim 3
Dependent Claim
20 words
A process as claimed in claim 1 wherein said aqueous solution contains about 0.75 to 1.5% by weight of NaOH.
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) | 1980-02-15 | 1980-08-16 | 1981-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-15 | 1984-08-16 | 1985-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-15 | 1988-08-16 | 1989-02-15 | $7700.00 | Window Closed / Lapsed |