Patent US3657002A successfully refreshed from Google Patents.
US3657002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shrinkproofing wool fabrics
Assignee: Wyandotte Chemicals Corp
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Filing: 1969-08-05
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Granted: 1972-04-18
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Expires: 1989-08-05
Abstract
Abstract A method for rendering wool fabric shrink resistant comprising treating the fabric with an aqueous emulsion of chain-extended urethane pre-polymers in surfactant-containing aqueous solution, drying the fabric, and thereafter curing the treated fabric.
Inventors
- 👤 John D Blodger
- 👤 Ian Macgugan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:24
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/564; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31562; Y10T442/00; Y10T442/20; Y10T442/2369; Y10T442/2385
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
53 words
The method of claim 1 wherein said fabric is padded to about a 92 to 97 percent wet pick-up weight based on the dry weight of said fabric and after drying said fabric has deposited thereon from about 2 to 3 percent dry solids pick-up based on the dry weight of said fabric.
Claim 2
Dependent Claim
21 words
The method of claim 2 wherein the polyalkylene ether polyol is the reaction product of propylene oxide and a trihydric alcohol.
Claim 3
Dependent Claim
19 words
The method of claim 2 wherein the poly-alkylene ether polyol is the reaction product of propylene oxide and trimethylolpropane.
Claim 4
Dependent Claim
60 words
The method of claim 2 wherein said prepolymer is chain-extended with about 1.0 equivalent of a chain-extending agent being selected from the group consisting of (1) an organic compound having at least two active hydrogen atoms and (2) a mixture of an organic compound having at least two active hydrogen atoms and an organic compound having one active hydrogen atoM.
Claim 5
Dependent Claim
13 words
The method of claim 5 wherein the prepolymer is chain-extended with a 2-methylpiperazine.
Claim 6
Dependent Claim
65 words
The method of claim 5 wherein said prepolymer is prepared by the reaction of an organic diisocyanate with a poly-alkylene ether polyol having a functionality greater than two and an equivalent weight of at least 500 to about 2,500, and said chain-extending agent is said mixture which contains from 0.05 to 0.5 equivalent per isocyanate equivalent of an organic compound having one active hydrogen atom.
Claim 7
Dependent Claim
12 words
The method of claim 7 wherein the organic diisocyanate is tolylene diisocyanate.
Claim 8
Dependent Claim
17 words
The method of claim 7 wherein the polyalkylene ether polyol is prepared from propylene oxide and trimethylolpropane.
Claim 9
Dependent Claim
17 words
The method of claim 7 wherein the organic compound having one active hydrogen atom is ethoxylated octylphenol.
Claim 10
Dependent Claim
18 words
The method of claim 7 wherein the organic compound having at least two active hydrogen atoms is 2-methylpiperazine.
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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) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |