GB1325286A - Process for the separation of an organic polyisocyanate mixture - Google Patents
Process for the separation of an organic polyisocyanate mixtureInfo
- Publication number
- GB1325286A GB1325286A GB504672A GB504672A GB1325286A GB 1325286 A GB1325286 A GB 1325286A GB 504672 A GB504672 A GB 504672A GB 504672 A GB504672 A GB 504672A GB 1325286 A GB1325286 A GB 1325286A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fraction
- diphenylmethane diisocyanate
- isomers
- mixture
- diphenylmethane
- 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
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C263/00—Preparation of derivatives of isocyanic acid
- C07C263/18—Separation; Purification; Stabilisation; Use of additives
- C07C263/20—Separation; Purification
-
- 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
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
-
- 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
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
- C08G18/7614—Polyisocyanates or polyisothiocyanates cyclic aromatic containing only one aromatic ring
- C08G18/7621—Polyisocyanates or polyisothiocyanates cyclic aromatic containing only one aromatic ring being toluene diisocyanate including isomer mixtures
-
- 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
- C08G2110/00—Foam properties
- C08G2110/0025—Foam properties rigid
-
- 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
- C08G2110/00—Foam properties
- C08G2110/0041—Foam properties having specified density
- C08G2110/005—< 50kg/m3
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Polyurethanes Or Polyureas (AREA)
Abstract
1325286 Separation of polyisocyanate mixtures GOTTFRIED REUTER GmbH 3 Feb 1972 [4 Feb 1971] 5046/72 Heading C2C [Also in Divisions B2 and C3] An organic polyisocyanate mixture which contains, in preponderant amount, diphenylmethane diisocyanate isomers and higher functional polyisocyanates with more than two benzene rings in the molecule is separated by first separating the mixture by a short path distillation into a first fraction which contains a residue of diphenylmethane diisocyanate isomers together with the higher functional polyisocyanates and into a second fraction which, of the polyisocyanates, contains practically only the diphenylmethane diisocyanate isomers and secondly separating the second fraction by fractional crystallization into a third fraction, which predominantly comprises 4,4<SP>1 </SP>- diphenylmethane diisocyanate, and into a fourth fraction, in which the 2,2<SP>1</SP>- and 2,4<SP>1</SP>- isomers of the diphenylmethane diisocyanate are enriched in the 4,4<SP>1</SP>-diphenylmethane diisocyanate. The second fraction may be freed from volatile substances and sparingly volatile, chlorine-containing compounds by a fractional distillation prior to the crystallization step. The fractional crystallization is preferably combined with a wash process in which the wash liquid is a diphenylmethane-diisocyanate mixture with a high content of 4,4<SP>1</SP>-isomer.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2105193A DE2105193C3 (en) | 1971-02-04 | 1971-02-04 | Process for the separation of an organic polyisocyanate mixture |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1325286A true GB1325286A (en) | 1973-08-01 |
Family
ID=5797784
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB504672A Expired GB1325286A (en) | 1971-02-04 | 1972-02-03 | Process for the separation of an organic polyisocyanate mixture |
Country Status (4)
Country | Link |
---|---|
BE (1) | BE778942A (en) |
DD (1) | DD106366A1 (en) |
DE (1) | DE2105193C3 (en) |
GB (1) | GB1325286A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1417087A (en) * | 1973-05-29 | 1975-12-10 | Ici Ltd | Polyisocyanates |
DE2711958B2 (en) * | 1977-03-18 | 1981-08-13 | Bayer Ag, 5090 Leverkusen | Binding or impregnating agent for lignocellulosic materials |
DE19739191A1 (en) * | 1997-09-08 | 1999-03-11 | Henkel Kgaa | Use of foam-free compositions containing polyurethanes for the production of casting resins and coating compositions |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3217024A (en) * | 1963-03-22 | 1965-11-09 | Allied Chem | Conversion of mixtures of 2, 4-and 2, 6-toluene diisocyanates to other mixtures of different isomer ratio |
BE755243Q (en) * | 1965-07-08 | 1971-02-01 | Upjohn Co | ISOCYANATES AND POLYISOCYANATES MANUFACTURING PROCESSES |
DE1923214B2 (en) * | 1969-05-07 | 1973-08-02 | PROCESS FOR THE SIMULTANEOUS PREPARATION OF PURE 4,4'-DIPHENYLMETHANE DIISOCYANATE AND A POLYPHENYL-POLYMETHYLENE-POLYISOCYANATE MIXTURE, POLYPHENYL-POLYMETHYLENE-POLYISOCYANATE, AND THE USE OF POLYPHENYL-POLYMETHYLENE-POLYISOCYANATE |
-
1971
- 1971-02-04 DE DE2105193A patent/DE2105193C3/en not_active Expired
-
1972
- 1972-02-03 GB GB504672A patent/GB1325286A/en not_active Expired
- 1972-02-03 BE BE778942A patent/BE778942A/en not_active IP Right Cessation
- 1972-02-04 DD DD160948A patent/DD106366A1/xx unknown
Also Published As
Publication number | Publication date |
---|---|
DD106366A1 (en) | 1974-06-12 |
DE2105193B2 (en) | 1980-12-04 |
BE778942A (en) | 1972-05-30 |
DE2105193A1 (en) | 1972-08-10 |
DE2105193C3 (en) | 1981-07-09 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
414F | Notice of opposition given (sect. 14/1949) | ||
414A | Case decided by the comptroller ** specification amended (sect. 14/1949) | ||
SP | Amendment (slips) printed | ||
PS | Patent sealed | ||
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |
Free format text: INSERT JOURNAL 5039, PAGE 2390 |