Patent US3770489A successfully refreshed from Google Patents.
US3770489A
Expired / Lapsed
US
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Creaseproofing cellulose-based fabrics
Assignee: United Merchants and Manuf Inc
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Filing: 1971-09-16
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Granted: 1973-11-06
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Expires: 1991-09-16
Abstract
Abstract A method for rendering cellulose-based fabrics wrinkle resistant by impregnating the fibers of the fabric with a polymer builder, polymerizing the polymer builder in the impregnated fabric while the fibers are in a wet and swollen state, drying the fabric, and then depositing a film of silicone polymer on the fabric. Fabrics obtained from the process are described.
Inventors
- 👤 B Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:31
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/643; D06M15/6436; D06M15/39; D06M15/423; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31855; Y10T428/3188; Y10T428/31942; Y10T428/31949; Y10T428/31953; Y10T442/00; Y10T442/20; Y10T442/2041; Y10T442/2098; Y10T442/2369; Y10T442/2393
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
31 words
The process of claim 1 wherein the silicone polymer is a high molecular weight methyl polysiloxane elastomer polymer, said polymer being in a substantially non-cross-linked state with respect to said fabric.
Claim 2
Dependent Claim
40 words
The process of claim 1 wherein the fabric is impregnated with sufficient polymer builder to produce a polymer content in the final fabric in the range from about 2 to 20 percent based on the total weight of the fabric.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein the polymer builder is melamine formaldehyde resin.
Claim 4
Dependent Claim
91 words
The process of claim 4 wherein impregnation step (a) is carried out by immersing the fabric in an aqueous bath containing from about 5 to 25 percent based on the total weight of the bath of mEthylolated melamine solids, said bath having a pH below about 5, adjusting the wet pick-up of the fabric to about 80 percent based on the weight of the fabric and wherein subsequent to the polymerization step (b), and prior to drying step (c), the fabric is washed with an alkaline solution to neutralize residual acidity.
Claim 5
Dependent Claim
36 words
The process of claim 5 wherein the polymerization step is carried out at a temperature in the range from about room temperature to 212*F and for a time period from about 15 minutes to 24 hours.
Claim 6
Dependent Claim
28 words
The process of claim 4 wherein the fabric has a cellulose content of at least about 20 percent by weight based on the total weight of the fabric.
Claim 7
Dependent Claim
10 words
A wrinkle resistant fabric obtained by the process of claim
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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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |