GB1483414A - Process for the production of polyurethanes dissolved in a solvent and also their use for the production of mouldings especially of microporous structures - Google Patents

Process for the production of polyurethanes dissolved in a solvent and also their use for the production of mouldings especially of microporous structures

Info

Publication number
GB1483414A
GB1483414A GB4737074A GB4737074A GB1483414A GB 1483414 A GB1483414 A GB 1483414A GB 4737074 A GB4737074 A GB 4737074A GB 4737074 A GB4737074 A GB 4737074A GB 1483414 A GB1483414 A GB 1483414A
Authority
GB
United Kingdom
Prior art keywords
prepolymer
viscosity
production
polyurethanes
solvent
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
Application number
GB4737074A
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.)
CHEM ANLAGENBAU BISCHOFSHEIM G
Original Assignee
CHEM ANLAGENBAU BISCHOFSHEIM G
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 CHEM ANLAGENBAU BISCHOFSHEIM G filed Critical CHEM ANLAGENBAU BISCHOFSHEIM G
Priority to DE2522019A priority Critical patent/DE2522019C2/en
Priority to JP50126475A priority patent/JPS5165174A/en
Priority to US05/624,892 priority patent/US4059659A/en
Priority to GB49575/75A priority patent/GB1529339A/en
Publication of GB1483414A publication Critical patent/GB1483414A/en
Expired legal-status Critical Current

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
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/0838—Manufacture of polymers in the presence of non-reactive compounds
    • C08G18/0842—Manufacture of polymers in the presence of non-reactive compounds in the presence of liquid diluents
    • C08G18/0847—Manufacture of polymers in the presence of non-reactive compounds in the presence of liquid diluents in the presence of solvents for the polymers
    • C08G18/0852—Manufacture of polymers in the presence of non-reactive compounds in the presence of liquid diluents in the presence of solvents for the polymers the solvents being organic
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Polyurethanes Or Polyureas (AREA)
  • Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)
  • Artificial Filaments (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

1483414 Polyurethanes CHEMIE - ANLAGENBAU BISCHOFSCHEIM GmbH 1 Nov 1974 [3 Nov 1973] 47370/74 Heading C3R [Also in Division B5] Polyurethanes dissolved in a solvent are prepared by reacting a solution containing 60 to 80% by weight of a linear prepolymer having 1À5 to 5% of free terminal NCO groups with a solution containing 0À02 to 0À05 mol. per cent of a hydrazine compound and/or a diamine, with continuous measurement of the viscosity, until the viscosity lies within a range in which ever decreasing amounts of the prepolymer cause an ever greater increase of the viscosity until the viscosity finally reaches a value at which the addition of the prepolymer must be stopped, at which a further very small addition of prepolymer would cause immediate gelling, the amount of prepolymer added being such that the final solution has a solids content of from 25 to 35% by weight. The hydrazine compound may be used in a stoichiometrical excess or insufficiency with regard to the NCO groups present and, when using an insufficiency, there is added an excess of a further substance containing at least two groups having actives hydrogen atoms which react with isocyanates. Microporous materials may be obtained from the solutions by conventional coagulation techniques.
GB4737074A 1973-11-03 1974-11-01 Process for the production of polyurethanes dissolved in a solvent and also their use for the production of mouldings especially of microporous structures Expired GB1483414A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE2522019A DE2522019C2 (en) 1974-11-01 1975-05-17 Process for the production of finished and / or irreversibly embossed microporous flat structures
JP50126475A JPS5165174A (en) 1974-11-01 1975-10-22 Shiageoshita oyobi * mataha fukagyakuenbotsushingushitasaikonoaru shiitokozotai no seizohoho
US05/624,892 US4059659A (en) 1974-11-01 1975-10-22 Process for producing finished and/or irreversibly embossed microporous sheet structures
GB49575/75A GB1529339A (en) 1974-11-01 1975-12-03 Production of microporous polyurethane sheet materials

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732355073 DE2355073A1 (en) 1973-11-03 1973-11-03 PROCESS FOR THE PRODUCTION OF POLYURETHANES SOLVED IN A SOLVENT AND THEIR USE FOR THE PRODUCTION OF SHAPED BODIES, IN PARTICULAR OF MICROPOROISES

Publications (1)

Publication Number Publication Date
GB1483414A true GB1483414A (en) 1977-08-17

Family

ID=5897174

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4737074A Expired GB1483414A (en) 1973-11-03 1974-11-01 Process for the production of polyurethanes dissolved in a solvent and also their use for the production of mouldings especially of microporous structures

Country Status (4)

Country Link
JP (1) JPS5811893B2 (en)
DD (2) DD115141A5 (en)
DE (1) DE2355073A1 (en)
GB (1) GB1483414A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4767535A (en) * 1983-11-19 1988-08-30 Akzo Nv Membranes of diisocyanate addition polymers for hemodialysis and/or hemofiltration

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4286014A (en) * 1978-01-31 1981-08-25 Toray Industries, Incorporated Composite sheet material
JP2600147B2 (en) * 1986-10-20 1997-04-16 松下電器産業株式会社 High frequency heating equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4767535A (en) * 1983-11-19 1988-08-30 Akzo Nv Membranes of diisocyanate addition polymers for hemodialysis and/or hemofiltration

Also Published As

Publication number Publication date
JPS5811893B2 (en) 1983-03-05
JPS5078698A (en) 1975-06-26
DD118104A5 (en) 1976-02-12
DD115141A5 (en) 1975-09-12
DE2355073A1 (en) 1975-05-07

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Legal Events

Date Code Title Description
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