JPS5721356A - Production of aromatic polyisocyanate - Google Patents
Production of aromatic polyisocyanateInfo
- Publication number
- JPS5721356A JPS5721356A JP9387980A JP9387980A JPS5721356A JP S5721356 A JPS5721356 A JP S5721356A JP 9387980 A JP9387980 A JP 9387980A JP 9387980 A JP9387980 A JP 9387980A JP S5721356 A JPS5721356 A JP S5721356A
- Authority
- JP
- Japan
- Prior art keywords
- solvent
- aromatic
- formula
- reaction
- pyrolyzed
- 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
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
PURPOSE: An aromatic polycarbamate is pyrolyzed in a low-boiling inert solvent under pressure to produce the titled compound along with little by-products in high efficiency, which is used as a starting material to give high-quality urethane foam.
CONSTITUTION: An aromatic polycarbamate of formula I (R is 1W4C alkyl; m is 0W5) is pyrolyzed in a specific solvent under pressure at 215W350°C into an aromatic isocyante of formula II and an alcohol. The solvent boils at a temperature lower than 215°C and is selected from aliphatic ethers, ketones, esters, and alicyclic or aromatic hydrocarbons. While the compound of formula II formed by the reaction remains in the solvent, the alcohol formed is continuously taken out of the reaction system to accelerate the reaction. The underisable formation of tar polymers is reduced and the solvent is removed under mild conditions, thus the objective compound of high quality is obtained.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9387980A JPS5721356A (en) | 1980-07-11 | 1980-07-11 | Production of aromatic polyisocyanate |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9387980A JPS5721356A (en) | 1980-07-11 | 1980-07-11 | Production of aromatic polyisocyanate |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5721356A true JPS5721356A (en) | 1982-02-04 |
Family
ID=14094754
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9387980A Pending JPS5721356A (en) | 1980-07-11 | 1980-07-11 | Production of aromatic polyisocyanate |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5721356A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02243184A (en) * | 1989-11-18 | 1990-09-27 | Takara Co Ltd | Manufacture of decoration for doll |
CN105837471A (en) * | 2015-01-16 | 2016-08-10 | 中国科学院过程工程研究所 | Two-stage pyrolysis device for preparation of polymethylene polyphenyl polyisocyanate by liquid phase pressurization thermal decomposition method and pyrolysis method |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2946768A (en) * | 1957-08-12 | 1960-07-26 | Bayer Ag | Condensation products of carbamic acid esters |
US3919279A (en) * | 1974-06-26 | 1975-11-11 | Atlantic Richfield Co | Catalytic production of isocyanates from esters of carbamic acids |
JPS5459264A (en) * | 1977-10-03 | 1979-05-12 | Atlantic Richfield Co | Diphenylmethane and dicarbamate homolog and production of polymethylpolyphenylcarbamate homolog |
JPS5665858A (en) * | 1979-10-20 | 1981-06-03 | Basf Ag | Manufacture of aromatic diiand*or polyisocyanate |
JPS5665856A (en) * | 1979-10-20 | 1981-06-03 | Basf Ag | Manufacture of mixture of diphenylmethanee diisocyanate and polyphenyllpolymethylenee polyisocyanate |
-
1980
- 1980-07-11 JP JP9387980A patent/JPS5721356A/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2946768A (en) * | 1957-08-12 | 1960-07-26 | Bayer Ag | Condensation products of carbamic acid esters |
US3919279A (en) * | 1974-06-26 | 1975-11-11 | Atlantic Richfield Co | Catalytic production of isocyanates from esters of carbamic acids |
JPS5119721A (en) * | 1974-06-26 | 1976-02-17 | Atlantic Richfield Co | Karubameetokarano isoshianeetono seiho |
JPS5459264A (en) * | 1977-10-03 | 1979-05-12 | Atlantic Richfield Co | Diphenylmethane and dicarbamate homolog and production of polymethylpolyphenylcarbamate homolog |
JPS5665858A (en) * | 1979-10-20 | 1981-06-03 | Basf Ag | Manufacture of aromatic diiand*or polyisocyanate |
JPS5665856A (en) * | 1979-10-20 | 1981-06-03 | Basf Ag | Manufacture of mixture of diphenylmethanee diisocyanate and polyphenyllpolymethylenee polyisocyanate |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02243184A (en) * | 1989-11-18 | 1990-09-27 | Takara Co Ltd | Manufacture of decoration for doll |
JPH0377751B2 (en) * | 1989-11-18 | 1991-12-11 | Takara Co Ltd | |
CN105837471A (en) * | 2015-01-16 | 2016-08-10 | 中国科学院过程工程研究所 | Two-stage pyrolysis device for preparation of polymethylene polyphenyl polyisocyanate by liquid phase pressurization thermal decomposition method and pyrolysis method |
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