GB1023461A - Preparation of high molecular weight polyoxymethylenes - Google Patents
Preparation of high molecular weight polyoxymethylenesInfo
- Publication number
- GB1023461A GB1023461A GB2677163A GB2677163A GB1023461A GB 1023461 A GB1023461 A GB 1023461A GB 2677163 A GB2677163 A GB 2677163A GB 2677163 A GB2677163 A GB 2677163A GB 1023461 A GB1023461 A GB 1023461A
- Authority
- GB
- United Kingdom
- Prior art keywords
- formaldehyde
- inert organic
- organic solvent
- molecular weight
- vapour
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2/00—Addition polymers of aldehydes or cyclic oligomers thereof or of ketones; Addition copolymers thereof with less than 50 molar percent of other substances
- C08G2/08—Polymerisation of formaldehyde
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polyoxymethylene Polymers And Polymers With Carbon-To-Carbon Bonds (AREA)
Abstract
A process for the preparation of high molecular weight polyoxymethylenes which comprises the steps of (a) generating monomeric formaldehyde by pyrolysis of a low molecular weight polymer of formaldehyde (b) diluting said monomeric formaldehyde with an inert gas and/or the vapour of an inert organic solvent (c) scrubbing the mixture of monomeric formaldehyde and the inert gas and/or vapour of the inert organic solvent with an inert organic solvent at a temperature of above +10 DEG C. and (d) polymerizing the monomeric formaldehyde by passing the stream of the mixture of monomeric formaldehyde and the inert gas and/or vapour of an inert organic solvent into an inert organic liquid containing a formaldehyde polymerization catalyst, said steps being carried out under sub-atmospheric pressure conditions at a formaldehyde partial pressure of below 300 mm.Hg. Paraformaldehyde is the preferred starting material. The residual gas-mixture from the polymerization step may be recycled.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEF37252A DE1172850B (en) | 1962-07-06 | 1962-07-06 | Process for the preparation of macromolecular polyoxymethylenes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1023461A true GB1023461A (en) | 1966-03-23 |
Family
ID=7096801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2677163A Expired GB1023461A (en) | 1962-07-06 | 1963-07-05 | Preparation of high molecular weight polyoxymethylenes |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE634427A (en) |
| DE (1) | DE1172850B (en) |
| GB (1) | GB1023461A (en) |
| NL (1) | NL295013A (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1037705B (en) * | 1952-08-30 | 1958-08-28 | Du Pont | Process for the polymerization of formaldehyde |
-
0
- NL NL295013D patent/NL295013A/xx unknown
- BE BE634427D patent/BE634427A/xx unknown
-
1962
- 1962-07-06 DE DEF37252A patent/DE1172850B/en active Pending
-
1963
- 1963-07-05 GB GB2677163A patent/GB1023461A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE1172850B (en) | 1964-06-25 |
| NL295013A (en) | |
| BE634427A (en) |
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