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Patent US4324832A successfully refreshed from Google Patents.
US4324832A
Expired / Lapsed
US
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Method of impregnating web structures with a synthetic resin
Assignee: Roehm GmbH Darmstadt
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Filing: 1980-01-18
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Granted: 1982-04-13
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Expires: 2000-01-18
Abstract
Abstract What is disclosed is a method for making a synthetic veneer, which method comprises impregnating a fibrous web structure with an aqueous dispersion of a finely divided synthetic resin, said dispersion further containing a water-soluble aminoplast resin dissolved therein, and then drying the impregnated web structure by heating it, said synthetic resin being thermoplastically deformable and in a non-crosslinked condition at the beginning of the drying step, but comprising a plurality of groups capable of external crosslinking and which do crosslink during the drying step.
Inventors
- 👤 Helmut Moroff
- 👤 Hanns Boessler
- 👤 Hans Hauser
- 👤 Gerhard Ladisich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:49
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/44; D21H17/45; D21H17/37; D21H17/375; D21H17/46; D21H17/47; D21H17/49; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31906; Y10T428/31942; Y10T428/31949; Y10T428/31964; Y10T442/00; Y10T442/20; Y10T442/259; Y10T442/2631; Y10T442/2721; Y10T442/273
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
121 words
A method for making a synthetic veneer, which method comprises impregnating a fibrous web structure with an agent consisting essentially of an aqueous dispersion of a finely divided synthetic resin free of self-crosslinking groups but comprising a plurality of groups capable of external crosslinking reactions with an aminoplast resin, said dispersion further having a water-soluble aminoplast resin dissolved therein, and then drying the impregnated web structure at a temperature from 60° C. to 200° C. out of contact with other objects in a single drying step directly to produce said synthetic veneer, said synthetic resin being thermoplastically deformable and in a non-crosslinked condition at the beginning of the drying step but entering into crosslinking reactions with said aminoplast resin during drying.
Claim 2
Independent Claim
121 words
A method for making a synthetic veneer, which method comprises impregnating a fibrous web structure with an agent consisting essentially of an aqueous dispersion of a finely divided synthetic resin free of self-crosslinking groups but comprising a plurality of groups capable of external crosslinking reactions with an aminoplast resin, said dispersion further having a water-soluble aminoplast resin dissolved therein, and then drying the impregnated web structure at a temperature from 60° C. to 200° C. out of contact with other objects in a single drying step directly to produce said synthetic veneer, said synthetic resin being thermoplastically deformable and in a non-crosslinked condition at the beginning of the drying step but entering into crosslinking reactions with said aminoplast resin during drying.
Claim 3
Dependent Claim
44 words
A method as in claim 1 wherein said synthetic resin comprises hydroxy, amido, or carboxy groups as the groups capable of external crosslinking and, after evaporation of water from said aqueous dispersion, forms a film having a T.sub.λmax -value of at most 35° C.
Claim 4
Dependent Claim
18 words
A method as in claim 1 wherein said fibrous web structure is a raw paper or non-woven fabric.
Claim 5
Dependent Claim
75 words
A method as in claim 1 wherein said synthetic resin is a copolymer consisting essentially of at least one member selected from the group consisting of acrylic acid esters and methacrylic acid esters and at least one member selected from the group consisting of acrylic acid, methacrylic acid, acrylamide, methacrylamide, and compounds of the formula ##STR2## wherein R is hydrogen or methyl and A is linear or branched alkylene having 2 to 6 carbon atoms.
Claim 6
Dependent Claim
30 words
A method as in claim 4 wherein said resin has a content of monomers capable of external crosslinking which is from 0.5 to 15 percent by weight of the polymer.
Claim 7
Dependent Claim
30 words
A method as in claim 4 wherein said resin has a content of monomers capable of external crosslinking which is from 2 to 10 percent by weight of the polymer.
Claim 8
Dependent Claim
42 words
A method as in claim 4 wherein said synthetic resin is a copolymer of methyl methacrylate, methacrylamide, methacrylic acid, and a member selected from the group consisting of the acrylic acid esters and methacrylic acid esters of C 2 -C 8 alcohols.
Claim 9
Dependent Claim
22 words
A method as in claim 1 wherein the radius of the particles in the synthetic resin dispersion is less than 100 nanometers.
Claim 10
Dependent Claim
23 words
A method as in claim 1 wherein the impregnated web is dried by heating at a temperature between 80° C. and 180° C.
Claim 11
Dependent Claim
23 words
A method as in claim 1 wherein the impregnated web is dried by heating at a temperature between 100° C. and 150° C.
Claim 12
Dependent Claim
14 words
A method as in claim 1 wherein said aminoplast resin is a urea-formaldehyde resin.
Claim 13
Dependent Claim
10 words
A synthetic veneer made by the method of claim 1.
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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) | 1985-04-12 | 1985-10-12 | 1986-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-12 | 1989-10-12 | 1990-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-12 | 1993-10-12 | 1994-04-13 | $7700.00 | Window Closed / Lapsed |