JPS5750541A - Method for removing excess formaldehyde in microcapsule dispersion - Google Patents

Method for removing excess formaldehyde in microcapsule dispersion

Info

Publication number
JPS5750541A
JPS5750541A JP12554180A JP12554180A JPS5750541A JP S5750541 A JPS5750541 A JP S5750541A JP 12554180 A JP12554180 A JP 12554180A JP 12554180 A JP12554180 A JP 12554180A JP S5750541 A JPS5750541 A JP S5750541A
Authority
JP
Japan
Prior art keywords
formaldehyde
range
removal
dihydroxy acetone
microcapsule dispersion
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.)
Pending
Application number
JP12554180A
Other languages
Japanese (ja)
Inventor
Mamoru Ishiguro
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Paper Mills Ltd
Original Assignee
Mitsubishi Paper Mills Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Paper Mills Ltd filed Critical Mitsubishi Paper Mills Ltd
Priority to JP12554180A priority Critical patent/JPS5750541A/en
Publication of JPS5750541A publication Critical patent/JPS5750541A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
    • B01J13/02—Making microcapsules or microballoons
    • B01J13/20—After-treatment of capsule walls, e.g. hardening

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing Of Micro-Capsules (AREA)

Abstract

PURPOSE:To remove the formaldehyde in a microcapsule dispersion by adding dihydroxy acetone in the conditions of 40-75 deg.C liquid temps. and 8.0-12.0 pH to a dispersion contg. residual formaldehyde. CONSTITUTION:The amt. of addition of the dihydroxy acetone used for removal of residual formaldehyde is preferably in a range of >=20% (w/w) and <=80% (w/w) based on the amt. of the formalin used (37% formaldehyde soln.). The pH at the reaction is desirable as the alkalinity is higher, and is more preferably in a 8.0-12.0pH range. When the pH is high, hydroxide of alkaline metals, ammonia, and the like are preferable. Application temps. are a from ordinary temp. to 75 deg.C range, and more preferably a 40-60 deg.C range is effective. The reaction mechanism and effect mechanism of dihydroxy acetone and formaldehyde are unkown at present, but the effect of removal is extremely high and the formaldehyde is removed in a short time. This is also usable in combination with conventional removal methods.
JP12554180A 1980-09-10 1980-09-10 Method for removing excess formaldehyde in microcapsule dispersion Pending JPS5750541A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12554180A JPS5750541A (en) 1980-09-10 1980-09-10 Method for removing excess formaldehyde in microcapsule dispersion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12554180A JPS5750541A (en) 1980-09-10 1980-09-10 Method for removing excess formaldehyde in microcapsule dispersion

Publications (1)

Publication Number Publication Date
JPS5750541A true JPS5750541A (en) 1982-03-25

Family

ID=14912743

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12554180A Pending JPS5750541A (en) 1980-09-10 1980-09-10 Method for removing excess formaldehyde in microcapsule dispersion

Country Status (1)

Country Link
JP (1) JPS5750541A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05186710A (en) * 1992-01-14 1993-07-27 Kubota Corp Ductile pipe excellent in ozone resistance
US6143352A (en) * 1994-06-28 2000-11-07 Closure Medical Corporation pH-modified biocompatible monomer and polymer compositions

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5732729A (en) * 1980-08-06 1982-02-22 Jujo Paper Co Ltd Method for removal of formaldehyde in microcapsule dispersion

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5732729A (en) * 1980-08-06 1982-02-22 Jujo Paper Co Ltd Method for removal of formaldehyde in microcapsule dispersion

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05186710A (en) * 1992-01-14 1993-07-27 Kubota Corp Ductile pipe excellent in ozone resistance
US6143352A (en) * 1994-06-28 2000-11-07 Closure Medical Corporation pH-modified biocompatible monomer and polymer compositions
US6306243B1 (en) 1994-06-28 2001-10-23 Closure Medical Corporation pH-modified biocompatible monomer and polymer compositions

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