GB619492A - Process for producing paper and the products so produced - Google Patents
Process for producing paper and the products so producedInfo
- Publication number
- GB619492A GB619492A GB1568645A GB1568645A GB619492A GB 619492 A GB619492 A GB 619492A GB 1568645 A GB1568645 A GB 1568645A GB 1568645 A GB1568645 A GB 1568645A GB 619492 A GB619492 A GB 619492A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resin
- urea
- seconds
- formaldehyde
- solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/47—Condensation polymers of aldehydes or ketones
- D21H17/49—Condensation polymers of aldehydes or ketones with compounds containing hydrogen bound to nitrogen
- D21H17/50—Acyclic compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Phenolic Resins Or Amino Resins (AREA)
Abstract
A urea-formaldehyde resin for giving high strength to paper has a solubility such that the whole of the resin remains in solution when one volume of a neutral 50 per cent (by weight) aqueous solution of resin is added to 100 volumes of water, and the whole of the resin is precipitated when one volume of said resin solution is added to 100 volumes of beater pulp at pH 4.5. The resin may be precipitated on the unsheeted fibres by acidifying the beater furnish with alum, for example, which also accelerates the cure of the resin. Curing may also be promoted by the addition of formaldehyde fixing agents such as urea, thiourea, melamine, guanidine, &c. According to examples, the resin is made by reacting 1.8 or 2.38 mols. of formaldehyde with 1 mol. of urea and the product is neutralized to pH 7. The resin solution has a viscosity less than 100 seconds at 100 DEG C.-preferably between 35 and 50 seconds-when measured by a pipette delivering 25 c.c. of water in 25 seconds at 25 DEG C. The Specification as open to inspection under Sect. 91 comprises also the use of resins made by reacting aldehydes such as acetaldehyde, propionaldehyde, butyraldehyde, benzaldehyde, furfural, paraformaldehyde and trioxane with amino compounds such as methyl urea, acetyl urea, cyanamide, dicyanodiamide, biuret, semicarbazide and aniline. This subject-matter does not appear in the Specification as accepted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1568645A GB619492A (en) | 1945-06-20 | 1945-06-20 | Process for producing paper and the products so produced |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1568645A GB619492A (en) | 1945-06-20 | 1945-06-20 | Process for producing paper and the products so produced |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB619492A true GB619492A (en) | 1949-03-10 |
Family
ID=10063602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1568645A Expired GB619492A (en) | 1945-06-20 | 1945-06-20 | Process for producing paper and the products so produced |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB619492A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2171841A1 (en) * | 1970-03-05 | 1973-09-28 | Centre Tech Ind Papier | |
| WO2009144379A2 (en) * | 2008-05-27 | 2009-12-03 | Ahlstrom Corporation | A method of manufacturing resinous papers, resinous papers, and their use as resinous preform blanks |
-
1945
- 1945-06-20 GB GB1568645A patent/GB619492A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2171841A1 (en) * | 1970-03-05 | 1973-09-28 | Centre Tech Ind Papier | |
| WO2009144379A2 (en) * | 2008-05-27 | 2009-12-03 | Ahlstrom Corporation | A method of manufacturing resinous papers, resinous papers, and their use as resinous preform blanks |
| WO2009144379A3 (en) * | 2008-05-27 | 2010-01-21 | Ahlstrom Corporation | A method of manufacturing resinous papers, resinous papers, and their use as resinous preform blanks |
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