US5073235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for chemically treating papermaking belts
Assignee: Procter and Gamble Co
•
Filing: 1990-04-12
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Granted: 1991-12-17
•
Expires: 2010-04-12
Abstract
Abstract A process for improving the life of papermaking belts containing a cured photosensitive polymeric resin is disclosed. The process includes the continuous application of an effective amount of chemical compounds capable of slowing down the degradation rate of the photosensitive polymeric resin to the belt's surface during the papermaking operation. Preferably, the chemical compounds are antioxidants which inhibit or retard oxidation of the cured resin and its ensuing degradative effects.
Inventors
- 👤 Paul D. Trokhan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:41
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/0027; D21F1/30; Y; Y10; Y10S; Y10S162/00; Y10S162/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
172 words
A process for extending the life of papermaking belts containing a solid polymeric resin which has been rendered solid by exposing a liquid photosensitive resin to light of an activating wavelength, which process comprises the steps of: a) providing a papermaking belt, said papermaking belt containing a solid polymeric resin which has been rendered solid by exposing a liquid photosensitive resin to light of an activating wavelength; and b) continuously applying a release emulsion comprising water, oil, surfactant, and an effective amount of an antioxidant chemical compound capable of inhibiting or retarding the oxidation rate of said solid polymeric resin to the papermaking belt, said release emulsion being continuously applied to the papermaking belt while the belt is being used in a papermaking machine, at a point where the belt is not in contact with a paper web, wherein said antioxidant chemical compound is selected from the group consisting of hindered phenols, secondary amines, and mixtures thereof, and wherein said antioxidant chemical is dissolved in the oil phase of the release emulsion.
Claim 2
Dependent Claim
172 words
A process for extending the life of papermaking belts containing a solid polymeric resin which has been rendered solid by exposing a liquid photosensitive resin to light of an activating wavelength, which process comprises the steps of: a) providing a papermaking belt, said papermaking belt containing a solid polymeric resin which has been rendered solid by exposing a liquid photosensitive resin to light of an activating wavelength; and b) continuously applying a release emulsion comprising water, oil, surfactant, and an effective amount of an antioxidant chemical compound capable of inhibiting or retarding the oxidation rate of said solid polymeric resin to the papermaking belt, said release emulsion being continuously applied to the papermaking belt while the belt is being used in a papermaking machine, at a point where the belt is not in contact with a paper web, wherein said antioxidant chemical compound is selected from the group consisting of hindered phenols, secondary amines, and mixtures thereof, and wherein said antioxidant chemical is dissolved in the oil phase of the release emulsion.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein the antioxidant chemical compound is an hindered phenol.
Claim 4
Dependent Claim
74 words
The process of claim 1 wherein said papermaking belt comprises: a framework having a paper-contacting first surface, a second surface opposite said first surface, and conduits extending between said first surface and said second surface, said framework comprised of said solid polymeric resin; and a reinforcing structure for reinforcing said framework, said reinforcing structure positioned between said first surface of said framework and at least a portion of said second surface of said framework.
Claim 5
Dependent Claim
14 words
The process of claim 3 wherein said reinforcing structure is a foraminous woven element.
Claim 6
Dependent Claim
14 words
The process of claim 4 wherein said solid polymeric resin is an acrylated urethane.
Claim 7
Dependent Claim
12 words
The process of claim 5 wherein said acrylated urethane is a methacrylated-urethane.
Claim 8
Dependent Claim
13 words
The process of claim 5 wherein said antioxidant chemical is a hindered phenol.
Claim 9
Dependent Claim
22 words
The process of claim 7 further comprising applying a secondary antioxidant selected from the group consisting of phosphites, thioesters, and mixtures thereof.
Claim 10
Dependent Claim
19 words
The process of claim 5 wherein the antioxidant chemical is applied to the paper-contacting surface of said papermaking belt.
Claim 11
Dependent Claim
13 words
The process of claim 9 wherein the antioxidant chemical is a hindered phenol.
Claim 12
Dependent Claim
24 words
The process of claim 10 wherein the solid polymeric resin is a methacrylate-urethane and wherein the antioxidant chemical comprises a mixture of hindered phenols.
Claim 13
Dependent Claim
14 words
The process of claim 11 comprising applying a secondary antioxidant which is a thioester.
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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) | 1994-12-16 | 1995-06-17 | 1995-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-16 | 1999-06-17 | 1999-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-16 | 2003-06-17 | 2003-12-17 | $7700.00 | Window Closed / Lapsed |