US4178221A
Expired / Lapsed
US
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Process for the preparation of water-soluble acrylic polymers by photopolymerization
Assignee: Rhone Poulenc Industries SA
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Filing: 1977-04-11
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Granted: 1979-12-11
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Expires: 1997-04-11
Abstract
Abstract Water-soluble acrylic polymers are prepared by a sequential photopolymerization process. A monomer solution is deposited on a support which is subsequently irradiated to effect polymerization. Photopolymerization promoters are incorporated in the monomer solution to facilitate polymerization.
Inventors
- 👤 Jean Boutin
- 👤 Jean Neel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:24
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/08; B01J19/12; B01J19/122; B01J19/123; B29; B29C; B29C35/00; B29C35/02; B29C35/08; B29C41/00; B29C41/02; B29C41/12; C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; C08; C08F; C08F2/00; C08F2/46; C08F2/48; C08F6/00; C08F6/006; B29C35/0805; B29C2035/0827; B29C2791/00; B29C2791/001; B29K; B29K2033/00; B29K2033/04; B29K2033/08; B29K2033/12; B29K2105/00; B29K2105/0058; B29K2105/0073; Y; Y10; Y10S; Y10S526/00; Y10S526/923; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31699
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
157 words
A method for the preparation of water-soluble acrylic polymers comprising: (a) continuously depositing on a support a thin layer of an aqueous solution comprising acrylic monomer and a photopolymerization initiator, said solution being substantially free of dissolved oxygen; (b) subjecting the thin liquid layer on the support to a first radiation stage comprising exposure to radiation of wavelengths between about 300 and 450 mμ and of average power between about 20 and 300 watt/m 2 for approximately 1 to 20 minutes in a gaseous atmosphere substantially free of oxygen while cooling said support to remove the heat of reaction; (c) maintaining the cooled support in said oxygen free atmosphere while subjecting same to a second radiation stage comprising exposure to radiation of wavelengths between about 300 and 450 mμ and of average power between about 300 and 2000 watt/m 2 for approximately 1 to 20 minutes; and (d) detaching the resultant partially solidified layer from the support.
Claim 2
Independent Claim
157 words
A method for the preparation of water-soluble acrylic polymers comprising: (a) continuously depositing on a support a thin layer of an aqueous solution comprising acrylic monomer and a photopolymerization initiator, said solution being substantially free of dissolved oxygen; (b) subjecting the thin liquid layer on the support to a first radiation stage comprising exposure to radiation of wavelengths between about 300 and 450 mμ and of average power between about 20 and 300 watt/m 2 for approximately 1 to 20 minutes in a gaseous atmosphere substantially free of oxygen while cooling said support to remove the heat of reaction; (c) maintaining the cooled support in said oxygen free atmosphere while subjecting same to a second radiation stage comprising exposure to radiation of wavelengths between about 300 and 450 mμ and of average power between about 300 and 2000 watt/m 2 for approximately 1 to 20 minutes; and (d) detaching the resultant partially solidified layer from the support.
Claim 3
Dependent Claim
14 words
The method as defined in claim 1, wherein said aqueous solution comprises polymerization modifiers.
Claim 4
Dependent Claim
20 words
The method as defined in claim 1, wherein said aqueous solution has an initial pH between about 8.0 and 13.5.
Claim 5
Dependent Claim
20 words
The method as defined in claim 1, wherein said aqueous solution has an initial pH between about 3.0 and 6.0.
Claim 6
Dependent Claim
37 words
The method as defined in claim 1, wherein said acrylic monomer is selected from the group consisting of acrylamide, acrylic acid and its alkali metal salts, alkyl acrylate, aminoalkyl methacrylate and its quaternized derivatives and mixtures thereof.
Claim 7
Dependent Claim
25 words
The method as defined in claim 5, wherein said monomer comprises between about 20 to 60% by weight acrylamide or acrylamide and alkali metal acrylate.
Claim 8
Dependent Claim
25 words
The method as defined in claim 6, wherein said monomer comprises between about 40 to 50% by weight acrylamide or acrylamide and alkali metal acrylate.
Claim 9
Dependent Claim
21 words
The method as defined in claim 5, wherein said monomer comprises between about 40 to 85% by weight quaternized aminoalkyl methacrylate.
Claim 10
Dependent Claim
21 words
The method as defined in claim 8, wherein said monomer comprises between about 60 to 80% by weight quaternized aminoalkyl methacrylate.
Claim 11
Dependent Claim
23 words
The method as defined in claim 5, wherein said monomer comprises between about 40 to 70% by weight acrylamide and quaternized aminoalkyl methacrylate.
Claim 12
Dependent Claim
28 words
The method as defined in claim 2, wherein said polymerization modifiers are present in the proportion of between about 0.1 to 6.0% by weight relative to said monomer.
Claim 13
Dependent Claim
21 words
The method as defined in claim 2, wherein said polymerization modifiers are selected from the group consisting of isopropanol and glycerol.
Claim 14
Dependent Claim
22 words
The method as defined in claim 1, wherein said photopolymerization initiator comprises about 0.005 to 1.0% by weight relative to said monomer.
Claim 15
Dependent Claim
22 words
The method as defined in claim 13, wherein said photopolymerization initiator comprises about 0.01 to 0.5% by weight relative to said monomer.
Claim 16
Dependent Claim
15 words
The method as defined in claim 1, wherein said photopolymerization initiator is benzoin isopropyl ether.
Claim 17
Dependent Claim
20 words
The method as defined in claim 1 wherein said aqueous solution contains less than about 1 mg of dissolved oxygen.
Claim 18
Dependent Claim
20 words
The method as defined in claim 16, wherein said aqueous solution contains less than about 0.5 mg of dissolved oxygen.
Claim 19
Dependent Claim
24 words
The method as defined in claim 1, wherein said first radiation stage comprises exposure to radiation of wavelengths between about 330 and 400 mμ.
Claim 20
Dependent Claim
23 words
The method as defined in claim 1, wherein said time of exposure in said first radiation stage is approximately 3 to 7 minutes.
Claim 21
Dependent Claim
23 words
The method as defined in claim 1, wherein said time of exposure in said second radiation stage is about 3 to 10 minutes.
Claim 22
Dependent Claim
27 words
The method as defined in claim 1, wherein the gaseous atmosphere of said first and second radiation stages contain less than about 5.0% by volume of oxygen.
Claim 23
Dependent Claim
18 words
The method as defined in claim 1, wherein said oxygen concentration is less than about 0.5% by volume.
Claim 24
Dependent Claim
24 words
The method as defined in claim 1, wherein the thickness of the liquid layer deposited on the support is between 3 and 20 mm.
Claim 25
Dependent Claim
31 words
The method as defined in claim 1, wherein the concentration of residual monomer contained in said thin layer on the support is less than about 1.0% after the second radiation stage.
Claim 26
Dependent Claim
17 words
The method as defined in claim 24, wherein said residual monomer concentration is less than about 0.5%.
Claim 27
Dependent Claim
58 words
The method as defined by claim 1, wherein after detaching the resultant partially solidified layer from the support the solidified polymer is subjected to a third radiation stage comprising exposure to radiation of wavelengths between about 300 and 450 mμ and an average power between about 20 and 500 watt/m 2 for approximately 30 minutes to 3 hours.
Claim 28
Dependent Claim
23 words
The method as defined in claim 26, wherein said time of exposure in said third radiation stage is approximately 40 to 90 minutes.
Claim 29
Dependent Claim
23 words
The method as defined in claim 26, wherein said third radiation stage comprises exposure to radiation of wavelengths between 330 and 400 mμ.
Claim 30
Dependent Claim
17 words
The method as defined in claim 26, wherein the said third radiation stage is made without cooling.
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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) | 1982-12-10 | 1983-06-11 | 1983-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-10 | 1987-06-11 | 1987-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-10 | 1991-06-11 | 1991-12-11 | $7700.00 | Window Closed / Lapsed |