US3876446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of poromeric materials
Assignee: BASF SE
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Filing: 1973-01-19
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Granted: 1975-04-08
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Expires: 1993-01-19
Abstract
Abstract Poromeric web materials are continuously manufactured by applying to a thin layer of ice crystals a textile fibrous structure and an aqueous solution or dispersion of A. polyethylenically unsaturated monomers having at least two polymerizable double bonds or mixtures of at least 0.1 percent w/w of such polyethylenically unsaturated monomers and monoethylenically unsaturated copolymerizable monomers and optionally high molecular weight polymers, or B. monoethylenically unsaturated monomers and high polymers having molecular weights of more than 10,000, Cooling the whole to such an extent that at least 50 percent of the water Crystallizes, irradiating the solidified structure with electromagnetic radiation having a wavelength of less than 0.70 .mu.m to cause polymerization of the monomers, causing the structure to thaw, removing the material from the support and optionally washing the removed material, separating it from the water and finally drying it.
Inventors
- 👤 Gerhard Bleckmann
- 👤 Axel Sanner
- 👤 Lothar Schlemmer
- 👤 August Wigger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:16
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; C08J9/283; B; B29; B29C; B29C67/00; B29C67/20; B29C67/202; C08F; C08F2/00; C08F2/46; C08F283/00; C08F283/01; C08F291/00; C08F291/18; C08J2201/00; C08J2201/04; C08J2201/05; C08J2201/0504
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
186 words
A PROCESS FOR THE CONTINUOUS MANUFACTURE OF POROMERIC WEB MATERIALS, COMPRISING A. PRODUCING A THIN LAYER OF ICE CRYSTALS ON A SUBSTRATE, B. APPLYING TO SAID LAYER OF ICE CRYSTALS WITH AT MOST PARTIAL THAWING OF THE SAME A FIBROUS WEB STRUCTURE AND AN AQUEOUS DISPERSION OF A MIXTURE OF POLYETHYLENICALLY UNSATURATED MONOMERS HAVING AT LEAST TWO POLYMERIZABLE DOUBLE BONDS, COPOLYMERIZABLE MONOETHYLENICALLY UNSATURATED MONOMERS AND HIGH POLYMERS, THE AMOUNT OF THE POLYETHYLENICALLY UNSATURATED MONOMERS BEING AT LEAST 0.1 PERCENT W/W BASED ON THE TOTAL MONOMERS, THE AMOUNT OF THE HIGH POLYMERS BEING BETWEEN 0.1 AND 30 PERCENT W/W, BASED ON THE TOTAL DISPERSION AND THE RATIO OF MONOMERS TO HIGH POLYMERS BEING FROM 0.5:1 TO 10:1, C. COOLING THE RESULTING STRUCTURE TO SUCH AN EXTENT THAT AT LEAST 50 PERCENT W/W OF THE WATER THEREIN FREEZES, D. IRRADIATING THE SOLIDIFIED STRUCTURE WITH ELECTROMAGNETIC RADIATION HAVING A WAVELENGTH OF LESS THAN 0.70 UM TO CAUSE POLYMERIZATION OF THE MONOMERS, E. CAUSING THE WATER IN THE SAID STRUCTURE TO MELT, F. SEPARATING THE RESULTING POROMERIC WEB MATERIAL FROM THE SUBSTRATE, SEPARATING IT FROM THE WATER AND DRYING IT.
Claim 2
Dependent Claim
186 words
A PROCESS FOR THE CONTINUOUS MANUFACTURE OF POROMERIC WEB MATERIALS, COMPRISING A. PRODUCING A THIN LAYER OF ICE CRYSTALS ON A SUBSTRATE, B. APPLYING TO SAID LAYER OF ICE CRYSTALS WITH AT MOST PARTIAL THAWING OF THE SAME A FIBROUS WEB STRUCTURE AND AN AQUEOUS DISPERSION OF A MIXTURE OF POLYETHYLENICALLY UNSATURATED MONOMERS HAVING AT LEAST TWO POLYMERIZABLE DOUBLE BONDS, COPOLYMERIZABLE MONOETHYLENICALLY UNSATURATED MONOMERS AND HIGH POLYMERS, THE AMOUNT OF THE POLYETHYLENICALLY UNSATURATED MONOMERS BEING AT LEAST 0.1 PERCENT W/W BASED ON THE TOTAL MONOMERS, THE AMOUNT OF THE HIGH POLYMERS BEING BETWEEN 0.1 AND 30 PERCENT W/W, BASED ON THE TOTAL DISPERSION AND THE RATIO OF MONOMERS TO HIGH POLYMERS BEING FROM 0.5:1 TO 10:1, C. COOLING THE RESULTING STRUCTURE TO SUCH AN EXTENT THAT AT LEAST 50 PERCENT W/W OF THE WATER THEREIN FREEZES, D. IRRADIATING THE SOLIDIFIED STRUCTURE WITH ELECTROMAGNETIC RADIATION HAVING A WAVELENGTH OF LESS THAN 0.70 UM TO CAUSE POLYMERIZATION OF THE MONOMERS, E. CAUSING THE WATER IN THE SAID STRUCTURE TO MELT, F. SEPARATING THE RESULTING POROMERIC WEB MATERIAL FROM THE SUBSTRATE, SEPARATING IT FROM THE WATER AND DRYING IT.
Claim 3
Dependent Claim
26 words
A process as claimed in claim 1, wherein the poromeric web material obtained, after removal from the substrate, is washed, separated from the water and dried.
Claim 4
Dependent Claim
41 words
A process as claimed in claim 1, wherein the structure containing fibrous material and ice crystals is irradiated with electromagnetic radiation having a wavelength of less than 0.70 .mu.m to cause polymerization of the monomers in the presence of a photoinitiator.
Claim 5
Dependent Claim
94 words
A process as claimed in claim 1, wherein the polyethylenically unsaturated monomers having at least two polymerizable double bonds are selected from the group consisting of diesters of C.sub.2-10 aliphatic or cycloaliphatic alcohols and C.sub.3-5 .alpha. ,.beta.-monoethylenically unsaturated monocarboxylic acids, vinyl esters of .alpha.,.beta.-monoolefinically unsaturated C.sub.3-5 monocarboxylic acids, divinyl esters of C.sub.4-8 dicarboxylic acids, allyl esters of C.sub.3-8 dicarboxylic acids, methylene bis-acrylamide, methylene bis-methacrylamide, diamides of C.sub.2-6 aliphatic diamines and .alpha.,.beta.-monoolefinically unsaturated C.sub.3-5 carboxylic acids, diethers of C.sub.2-10 aliphatic or cycloaliphatic diols and N-hydroxymethylamides of .alpha.,.beta.-monoolefinically unsaturated C.sub.3-5 monocarboxylic acids and polyethylenically unsaturated polyesters.
Claim 6
Dependent Claim
48 words
A process as claimed in claim 1, wherein monoethylenically unsaturated monomers are selected from the group consisting of esters of C.sub.3-5 .alpha.,.beta.-monoolefinically unsaturated monocarboxylic acids with C.sub.1-8 alkanols, acrylamides, methacrylamides, vinyl esters of C.sub.2-18 saturated aliphatic carboxylic acids, N-vinyl pyrrolidone, N-vinyl carbazole, vinyl halides and monovinyl aromatic monomers.
Claim 7
Dependent Claim
66 words
A process as claimed in claim 1, wherein high polymers are used in aqueous dispersion and are selected from the group consisting of homopolymers and copolymers of acrylates of C.sub.1-8 alkanols, methacrylates of C.sub.1-8 alkanols, acrylamides, methacrylamides, N-methylol compounds of acrylamides, N-methylol compounds of methacrylamides, acrylic acid, methacrylic acid, vinyl esters of C.sub.2-18 aliphatic monocarboxylic acids, vinyl halides, styrene and mixtures of said homopolymers and copolymers.
Claim 8
Dependent Claim
34 words
A process as claimed in claim 1 wherein said monomers are butanediol-1,4 diacrylate and butanediol-1,4 monoacrylate and wherein said high polymer is a copolymer of butyl acrylate, acrylic acid, butanediol-1,4 diacrylate and N-methylol acrylamide.
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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |