JPS5536231A - Removal of free formaldehyde - Google Patents
Removal of free formaldehydeInfo
- Publication number
- JPS5536231A JPS5536231A JP10913578A JP10913578A JPS5536231A JP S5536231 A JPS5536231 A JP S5536231A JP 10913578 A JP10913578 A JP 10913578A JP 10913578 A JP10913578 A JP 10913578A JP S5536231 A JPS5536231 A JP S5536231A
- Authority
- JP
- Japan
- Prior art keywords
- urea
- formaldehyde
- free formaldehyde
- polymer
- removal
- 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.)
- Granted
Links
Landscapes
- Phenolic Resins Or Amino Resins (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
PURPOSE: To obtain a polymer containing no free formaldehyde, usable for improving the opacity of paper, by adding urea to a urea-formaldehyde polymer dispersion under acidic conditions, and by neutralizing the mixture after a specific time to suppress the particle coarsening.
CONSTITUTION: Urea in an amount equimolar or more with formaldehyde is added to a dispersion of a crosslinked urea-formaldehyde, wherein free formaldehyde is dissolved, at a pH≤4, and the reaction mixture is neutralized 3minW1hr after the urea ddition to give a polymer having a particle size of 0.1W1.0μ containing no free formaldehyde.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10913578A JPS5536231A (en) | 1978-09-07 | 1978-09-07 | Removal of free formaldehyde |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10913578A JPS5536231A (en) | 1978-09-07 | 1978-09-07 | Removal of free formaldehyde |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5536231A true JPS5536231A (en) | 1980-03-13 |
| JPS5727905B2 JPS5727905B2 (en) | 1982-06-14 |
Family
ID=14502462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10913578A Granted JPS5536231A (en) | 1978-09-07 | 1978-09-07 | Removal of free formaldehyde |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5536231A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4499200A (en) * | 1982-05-17 | 1985-02-12 | Chem-Nuclear Systems, Inc. | Compound catalyst system usable for the polymerization or curing of urea-formaldehyde polymeric condensation systems |
| JPS61138615A (en) * | 1984-12-11 | 1986-06-26 | Mitsui Toatsu Chem Inc | Removal of free formaldehyde |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6742177B2 (en) | 2016-07-15 | 2020-08-19 | キヤノン株式会社 | Imprint apparatus and article manufacturing method |
-
1978
- 1978-09-07 JP JP10913578A patent/JPS5536231A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4499200A (en) * | 1982-05-17 | 1985-02-12 | Chem-Nuclear Systems, Inc. | Compound catalyst system usable for the polymerization or curing of urea-formaldehyde polymeric condensation systems |
| JPS61138615A (en) * | 1984-12-11 | 1986-06-26 | Mitsui Toatsu Chem Inc | Removal of free formaldehyde |
| JPH0464529B2 (en) * | 1984-12-11 | 1992-10-15 | Mitsui Toatsu Chemicals |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5727905B2 (en) | 1982-06-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS5536231A (en) | Removal of free formaldehyde | |
| JPS551821A (en) | Fine grain bulk density regulating agent | |
| JPS5316048A (en) | Cathod-depositing coating composition and its preparation | |
| JPS56131658A (en) | Improvement in dispersion of loading material | |
| JPS5239636A (en) | Synthetic process of dihydrocoenzyme q group compound | |
| JPS5622371A (en) | Water-dispersible pressure-sensitive adhesive | |
| JPS565133A (en) | Preparation of removing agent for sulfureous malodorant substance | |
| JPS57212243A (en) | Preventing method for formation of nitrosamine in rubber | |
| JPS55104687A (en) | Ammonia-containing liquid total treating agent and method therewith | |
| JPS5293162A (en) | Method for treating waste water | |
| ES8207577A1 (en) | Process for reducing the formaldehyde emission in acid-curable paints based on a mixture of a urea resin and an alkyde resin. | |
| JPS5411292A (en) | Immobilized material having enzymatic activity and its preparation | |
| JPS53109594A (en) | Preparation of new cationic dolymer | |
| JPS51148084A (en) | Process for assimilating and decomposing of formaldehyde by the use of microorganisms | |
| JPS53106788A (en) | Preparation of water soluble resol resin | |
| JPS5375297A (en) | Polymerization of 4,4'-thiobis (6-tertialbutyl-m-cresol) | |
| JPS52131662A (en) | Refuse treating device | |
| JPS5296640A (en) | Improved adhesive composition for wood | |
| JPS5589319A (en) | Production of flame-retardant phenolic resin | |
| JPS52154893A (en) | Preparation of urea resin syrup | |
| JPS53100583A (en) | Method of dehydrating slurry cargo loaded in ship hold | |
| JPS51144779A (en) | A process for immobilizing microorganisms | |
| JPS5624420A (en) | Preparation of alkylene oxide polymer having arbitrary polymerization degree | |
| JPS5370560A (en) | Method of treating waste water | |
| JPS52110758A (en) | Production of polymer dispersion containing flame retarder |