CH334657A - Verfahren zur Herstellung von polymeren Produkten, die Urethan- und Harnstoffgruppen enthalten - Google Patents

Verfahren zur Herstellung von polymeren Produkten, die Urethan- und Harnstoffgruppen enthalten

Info

Publication number
CH334657A
CH334657A CH334657DA CH334657A CH 334657 A CH334657 A CH 334657A CH 334657D A CH334657D A CH 334657DA CH 334657 A CH334657 A CH 334657A
Authority
CH
Switzerland
Prior art keywords
manufacture
products containing
urea groups
containing urethane
polymeric products
Prior art date
Application number
Other languages
English (en)
Inventor
B Hill Frederick
O Langerak Esley
J Prucino Lawrence
R Remington William
Original Assignee
Du Pont
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 Du Pont filed Critical Du Pont
Publication of CH334657A publication Critical patent/CH334657A/de

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/02—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by the reacting monomers or modifying agents during the preparation or modification of macromolecules
    • 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
    • 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
    • C08G18/089—Reaction retarding agents
    • 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
    • C08G18/08—Processes
    • C08G18/16—Catalysts
    • C08G18/166—Catalysts not provided for in the groups C08G18/18 - C08G18/26
    • C08G18/168—Organic compounds
    • 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
    • C08G18/16—Catalysts
    • C08G18/18—Catalysts containing secondary or tertiary amines or salts thereof
    • 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
    • C08G18/16—Catalysts
    • C08G18/18—Catalysts containing secondary or tertiary amines or salts thereof
    • C08G18/1875—Catalysts containing secondary or tertiary amines or salts thereof containing ammonium salts or mixtures of secondary of tertiary amines and acids
    • 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
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/30—Low-molecular-weight compounds
    • C08G18/302—Water
    • 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
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/48—Polyethers
    • C08G18/4825—Polyethers containing two hydroxy groups
    • 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
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/48—Polyethers
    • C08G18/4833—Polyethers containing oxyethylene units
    • 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
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/48—Polyethers
    • C08G18/4854—Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group
    • 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
    • C08G2110/0008—Foam properties flexible
    • 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
    • C08G2110/0083—Foam properties prepared using water as the sole blowing agent
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2375/04—Polyurethanes
    • C08J2375/08—Polyurethanes from polyethers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S220/00—Receptacles
    • Y10S220/14—Plastic
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S273/00—Amusement devices: games
    • Y10S273/08—Urethane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S528/00—Synthetic resins or natural rubbers -- part of the class 520 series
    • Y10S528/906—Fiber or elastomer prepared from an isocyanate reactant

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)
  • Materials Engineering (AREA)
  • Polyurethanes Or Polyureas (AREA)
CH334657D 1951-07-19 1952-07-18 Verfahren zur Herstellung von polymeren Produkten, die Urethan- und Harnstoffgruppen enthalten CH334657A (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US321881XA 1951-07-19 1951-07-19
US365270A US2929800A (en) 1951-07-19 1953-06-30 Polytetramethylene ether polyurethane polymers

Publications (1)

Publication Number Publication Date
CH334657A true CH334657A (de) 1958-12-15

Family

ID=26708094

Family Applications (3)

Application Number Title Priority Date Filing Date
CH334657D CH334657A (de) 1951-07-19 1952-07-18 Verfahren zur Herstellung von polymeren Produkten, die Urethan- und Harnstoffgruppen enthalten
CH321881D CH321881A (de) 1951-07-19 1952-07-18 Verfahren zur Herstellung eines linearen Polyurethanpolymeren
CH347005D CH347005A (de) 1951-07-19 1954-06-30 Verfahren zur Herstellung eines Urethan- und Harnstoffgruppen enthaltenden Polymers

Family Applications After (2)

Application Number Title Priority Date Filing Date
CH321881D CH321881A (de) 1951-07-19 1952-07-18 Verfahren zur Herstellung eines linearen Polyurethanpolymeren
CH347005D CH347005A (de) 1951-07-19 1954-06-30 Verfahren zur Herstellung eines Urethan- und Harnstoffgruppen enthaltenden Polymers

Country Status (4)

Country Link
US (1) US2929800A (de)
CH (3) CH334657A (de)
FR (2) FR1065377A (de)
GB (3) GB731071A (de)

Families Citing this family (237)

* Cited by examiner, † Cited by third party
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GB831301A (en) * 1955-04-01 1960-03-30 Dunlop Rubber Co Reaction products of polyesters with polyisocyanates or polyisothiocyanates
US2886555A (en) * 1955-07-26 1959-05-12 Bayer Ag New composition of matter and process for producing same
GB831302A (en) * 1955-10-05 1960-03-30 Dunlop Rubber Co Reaction products of polymers with polyisocyanates or polyisothiocyanates
DE1059656B (de) * 1955-11-21 1959-06-18 Us Rubber Co Herstellung von offenporigen Schaumstoffen
GB820005A (en) * 1956-08-15 1959-09-16 Us Rubber Co Improvements in polyurethane elastomers and method of making the same
DE1091323B (de) * 1956-08-20 1960-10-20 Collo Rheincollodium G M B H Verfahren zur Herstellung von Urethangruppen aufweisenden Schaumstoffen
BE560394A (de) * 1956-09-18
DE1103576B (de) * 1956-12-05 1961-03-30 Gen Tire & Rubber Co Verfahren zur Herstellung von Polyurethanschaumstoffen
DE1081219B (de) * 1957-05-20 1960-05-05 Gen Tire & Rubber Co Verfahren zum Stabilisieren von vernetzten, homogenen oder schaumartigen Polyalkylenglykolaetherurethanen
GB865726A (en) * 1957-08-13 1961-04-19 Bayer Ag Process for the manufacture of plastics from polyhydroxy compounds and polyisocyanates
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DE1055808B (de) * 1957-11-07 1959-04-23 Collo Rheincollodium G M B H Verfahren zur Herstellung von homogenen Formkoerpern
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US3094494A (en) * 1959-01-26 1963-06-18 Rohm & Haas Improved ion exchange cellular products
US3148173A (en) * 1959-01-26 1964-09-08 Wyandotte Chemicals Corp Polyurethane-ureas containing urealinked nu-(2-hydroxypropyl) alkylene diamines
DE1278687B (de) * 1959-04-17 1968-09-26 Bayer Ag Verfahren zur Herstellung hochelastischer Faeden oder Fasern aus Isocyanat-Polyadditionsprodukten
DE1112286B (de) * 1959-06-19 1961-08-03 Bayer Ag Verfahren zur Herstellung vernetzter Urethan- und Harnstoffgruppen aufweisender Kunststoffe
BE594678A (de) * 1959-09-04
DE1110859B (de) * 1959-09-22 1961-07-13 Bayer Ag Verfahren zur Herstellung von hochmolekularen, vernetzten und gegebenenfalls verschaeumten Kunststoffen
US3242139A (en) * 1960-01-25 1966-03-22 Phillips Petroleum Co Polyurethane compositions based on 3, 11-dioxa-5, 7, 9-trinitraza-1, 13-tridecanediol
GB965220A (en) * 1960-04-05 1964-07-29 Dunlop Rubber Co Improvements in and relating to polyurethanes
NL265351A (de) * 1960-05-31
DE1123467B (de) * 1960-08-12 1962-02-08 Bayer Ag Verfahren zur Herstellung von Urethan- und Semicarbazid-Gruppierungen aufweisenden, aus der Loesung verformbaren, hochelastischen Polymeren
DE1124686B (de) * 1960-09-02 1962-03-01 Bayer Ag Verfahren zur Herstellung kautschukelastischer Kunststoffe
US3133036A (en) * 1960-11-07 1964-05-12 Du Pont Polyurethane fibers containing a colorless leuco derivative of a blue-violet dye
US3281378A (en) * 1963-06-06 1966-10-25 Merck & Co Inc Diisocyanato substituted aliphatic carboxylic acid ester urethane reaction products
BE611164A (de) * 1960-12-19
DE1124687B (de) * 1960-12-24 1962-03-01 Bayer Ag Verfahren zur Herstellung von Schaumstoffen nach dem Isocyanat-Polyadditions-Verfahren
DE1128132B (de) * 1961-01-25 1962-04-19 Bayer Ag Verfahren zur Herstellung von gegebenenfalls verschaeumten Formkoerpern einschliesslich Flaechengebilden
US3203932A (en) * 1961-03-10 1965-08-31 Wyandotte Chemicals Corp Metallo-organic catalyzed one-shot process for preparing urethaneurea elastomers
US3248371A (en) * 1961-03-10 1966-04-26 Wyandotte Chemicals Corp Cross-linking blocked two-step prepolymer polyurethane coating compositions
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BE617880A (de) * 1961-06-01 1900-01-01
US3180854A (en) * 1961-06-14 1965-04-27 Polythane Corp Double diamine modification of urethane prepolymers
BE619212A (de) * 1961-06-22
US3160648A (en) * 1961-08-02 1964-12-08 Koppers Co Inc 9, 9-bis (3'-isocyanatopropyl) fluorene
US3250745A (en) * 1961-08-04 1966-05-10 Nopco Chem Co Alkylated bisphenol alkylene oxide adduct based polyurethane prepolymers
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US3314922A (en) * 1961-08-21 1967-04-18 Du Pont Polymers and process of making same
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US3294873A (en) * 1961-09-12 1966-12-27 Fmc Corp Phosphorylated polyether polyols
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US3205120A (en) * 1962-01-23 1965-09-07 Union Carbide Corp Laminated structures
US3178310A (en) * 1962-03-01 1965-04-13 Du Pont Aqueous polyurethane coating emulsions
US3235633A (en) * 1962-04-02 1966-02-15 Gen Motors Corp Method of molding filter end caps
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NL293352A (de) * 1962-05-30 1900-01-01
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DE1156977B (de) * 1962-06-05 1963-11-07 Bayer Ag Verfahren zur Herstellung von elastischen, gegebenenfalls verschaeumten Polyurethanen
GB1051024A (de) * 1962-07-07
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US3264269A (en) * 1962-08-03 1966-08-02 Du Pont Process for cross-linking polymers containing carboxyl groups which comprises imbibing a shaped article of the polymer in a dhsocyanate
GB1052042A (de) * 1962-08-09
US3294751A (en) * 1962-09-28 1966-12-27 Air Prod & Chem Polyurethane compositions from ureido-polyols
US3297649A (en) * 1962-11-13 1967-01-10 Rohm & Haas Process for curing polyurethanes
US3222208A (en) * 1963-01-07 1965-12-07 Interchem Corp Composition and method for making water vapor permeable coated fabric
US3455883A (en) * 1963-01-09 1969-07-15 Gen Mills Inc Polyisocyanates and derivatives
US3244675A (en) * 1963-03-04 1966-04-05 Du Pont Poly (1, 3-oxaza-2, 4-diones) polymers
US3322568A (en) * 1963-03-15 1967-05-30 Interchem Corp Composition and method for producing leather substitute
US3248472A (en) * 1963-04-08 1966-04-26 Bell Telephone Labor Inc Sheathed cable with a fluid stop of a polyurethane polymer
US3379683A (en) * 1963-04-17 1968-04-23 Du Pont Polyurethanes prepared from m-xylylenediamine
US3210272A (en) * 1963-04-25 1965-10-05 Dow Chemical Co Method of drying particulate solids
US3244571A (en) * 1963-05-02 1966-04-05 Weisman Morey Process for dielectrically embossing polyurethane foam assemblies
FR1368153A (fr) * 1963-05-07 1964-07-31 Rhone Poulenc Sa Polyesteruréthannes thermoplastiques élastiques
DE1176357B (de) * 1963-06-06 1964-08-20 Bayer Ag Verfahren zur Herstellung von vernetzten Kunst-stoffen, einschliesslich Schaumstoffen und Flaechengebilden auf Polyurethanbasis
US3288821A (en) * 1963-06-07 1966-11-29 C P Hall Company Of Illinois Brominated and chlorinated amides and process for making same
US3383357A (en) * 1963-06-25 1968-05-14 Du Pont Polyhedral borane diisocyanate polymers
US3324202A (en) * 1963-07-09 1967-06-06 Fmc Corp Phosphorus-containing polyols
US3425973A (en) * 1963-08-09 1969-02-04 Du Pont Coating composition based on aromatic diisocyanates,polyols,and monohydric alcohols
US3265669A (en) * 1963-08-19 1966-08-09 Furane Plastics Liquid amine hardener compositions for polyurethane resins
DE1217058B (de) * 1963-09-07 1966-05-18 Bayer Ag Verfahren zur Herstellung hochelastischer Folien oder Faeden nach dem Isocyanat-Polyadditionsverfahren
US3454606A (en) * 1963-11-14 1969-07-08 Union Carbide Corp Isocyanatophenylsulfonyl isocyanates
US3256249A (en) * 1963-11-21 1966-06-14 Wyandotte Chemicals Corp Phosphoramidate based polyurethanes
US3417063A (en) * 1963-12-30 1968-12-17 Universal Oil Prod Co Polymeric compositions of matter formed by the reaction of prepolymers with polyhalopolyhydrodimethanonaphthalenedicarboxylic acids and anhydrides thereof
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CH347005A (de) 1960-06-15
GB731071A (en) 1955-06-01
GB796044A (en) 1958-06-04
GB796041A (en) 1958-06-04
FR68857E (fr) 1958-06-11
CH321881A (de) 1957-05-31
FR1065377A (fr) 1954-05-24
US2929800A (en) 1960-03-22

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