BE753203A - Procede de melange d'un isocyanate avec un catalyseur et produits obtenus - Google Patents

Procede de melange d'un isocyanate avec un catalyseur et produits obtenus

Info

Publication number
BE753203A
BE753203A BE753203DA BE753203A BE 753203 A BE753203 A BE 753203A BE 753203D A BE753203D A BE 753203DA BE 753203 A BE753203 A BE 753203A
Authority
BE
Belgium
Prior art keywords
isocyanate
catalyst
mixing
products obtained
products
Prior art date
Application number
Other languages
English (en)
French (fr)
Inventor
G M Rambosek
M G Allen
G Van Dike Tiers
Original Assignee
Minnesota Mining & Mfg
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 Minnesota Mining & Mfg filed Critical Minnesota Mining & Mfg
Publication of BE753203A publication Critical patent/BE753203A/xx

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
    • C08J9/0014—Use of organic additives
    • 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
    • C08G18/02—Polymeric products of isocyanates or isothiocyanates of isocyanates or isothiocyanates only
    • C08G18/022—Polymeric products of isocyanates or isothiocyanates of isocyanates or isothiocyanates only the polymeric products containing isocyanurate 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
    • C08G18/08—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
    • C08G18/22—Catalysts containing metal compounds
    • C08G18/225—Catalysts containing metal compounds of alkali or alkaline earth metals
    • 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
    • C08G18/38—Low-molecular-weight compounds having heteroatoms other than oxygen
    • C08G18/3802—Low-molecular-weight compounds having heteroatoms other than oxygen having halogens
    • C08G18/3814—Polyamines
    • 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
    • C08G18/38—Low-molecular-weight compounds having heteroatoms other than oxygen
    • C08G18/3819—Low-molecular-weight compounds having heteroatoms other than oxygen having nitrogen
    • 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
    • C08G18/38—Low-molecular-weight compounds having heteroatoms other than oxygen
    • C08G18/3819—Low-molecular-weight compounds having heteroatoms other than oxygen having nitrogen
    • C08G18/3823—Low-molecular-weight compounds having heteroatoms other than oxygen having nitrogen containing -N-C=O groups
    • C08G18/3825—Low-molecular-weight compounds having heteroatoms other than oxygen having nitrogen containing -N-C=O groups containing amide 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
    • C08G18/30—Low-molecular-weight compounds
    • C08G18/38—Low-molecular-weight compounds having heteroatoms other than oxygen
    • C08G18/3855—Low-molecular-weight compounds having heteroatoms other than oxygen having sulfur
    • 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
    • C08G18/38—Low-molecular-weight compounds having heteroatoms other than oxygen
    • C08G18/3855—Low-molecular-weight compounds having heteroatoms other than oxygen having sulfur
    • C08G18/3857—Low-molecular-weight compounds having heteroatoms other than oxygen having sulfur having nitrogen in addition to sulfur
    • C08G18/3861—Low-molecular-weight compounds having heteroatoms other than oxygen having sulfur having nitrogen in addition to sulfur containing sulfonamide and/or sulfonylhydrazide groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/02—Halogenated hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing 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
    • C08G2110/00—Foam properties
    • C08G2110/0041—Foam properties having specified density
    • 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
    • C08G2115/00—Oligomerisation
    • C08G2115/02—Oligomerisation to isocyanurate groups
    • 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
    • Y10S521/00—Synthetic resins or natural rubbers -- part of the class 520 series
    • Y10S521/902—Cellular polymer containing an isocyanurate structure

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)
  • Organic Insulating Materials (AREA)
BE753203D 1969-07-10 1970-07-09 Procede de melange d'un isocyanate avec un catalyseur et produits obtenus BE753203A (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US84085469A 1969-07-10 1969-07-10
US84083469A 1969-07-10 1969-07-10
US020012A US3880782A (en) 1969-07-10 1970-03-16 Fluorochemical foam stabilizer and foamed isocyanate-derived polymers made therewith

Publications (1)

Publication Number Publication Date
BE753203A true BE753203A (fr) 1971-01-11

Family

ID=27361350

Family Applications (2)

Application Number Title Priority Date Filing Date
BE753203D BE753203A (fr) 1969-07-10 1970-07-09 Procede de melange d'un isocyanate avec un catalyseur et produits obtenus
BE753204D BE753204A (fr) 1969-07-10 1970-07-09 Procede de preparation d'un polymere cellulaire derive d'isocyanate et produit obtenu

Family Applications After (1)

Application Number Title Priority Date Filing Date
BE753204D BE753204A (fr) 1969-07-10 1970-07-09 Procede de preparation d'un polymere cellulaire derive d'isocyanate et produit obtenu

Country Status (7)

Country Link
US (3) US3635848A (de)
JP (1) JPS5248160B1 (de)
BE (2) BE753203A (de)
CH (2) CH544129A (de)
DE (2) DE2034166A1 (de)
FR (2) FR2054390A5 (de)
GB (2) GB1317163A (de)

Families Citing this family (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1941500B2 (de) * 1968-08-18 1975-08-28 Hashimoto Kogyo Co., Ltd., Tokio Verfahren zur Herstellung von elastomeren Polyurethanen
US3635848A (en) * 1969-07-10 1972-01-18 Minnesota Mining & Mfg Isocyanurates, polyisocyanurates and polyurethanes and their preparation using as a catalyst a coordination compound of an organic borate ester and an alkali or alkaline earth metal
US3836424A (en) * 1972-07-18 1974-09-17 R Grieve Polyisocyanurate foam articles
US4008350A (en) * 1972-08-31 1977-02-15 Minnesota Mining And Manufacturing Company Visco-elastic material comprising a polymeric foam impregnated with an acrylic resin
US3903346A (en) * 1973-01-11 1975-09-02 Celotex Corp Polyisocyanurate structural laminate and process for producing same
US3993608A (en) * 1974-06-27 1976-11-23 Minnesota Mining And Manufacturing Company Poly(urethane-isocyanurate) foams containing hollow glass spheres
DE2528898A1 (de) * 1975-06-28 1977-01-13 Bischofsheim Chemie Anlagen Anorganisch-organische polymere und verfahren zu ihrer herstellung
US4182826A (en) * 1975-07-31 1980-01-08 Bayer Aktiengesellschaft Process for the production of rapid-set moldings
DE2631167C3 (de) * 1976-07-10 1985-01-31 Bayer Ag, 5090 Leverkusen Verfahren zur Herstellung von massiven Formteilen
US4151334A (en) * 1976-12-20 1979-04-24 Basf Wyandotte Corporation Process for the preparation of carbodiimide-isocyanurate foams employing quaternary boron salts as catalysts
US4152497A (en) * 1978-03-27 1979-05-01 Pennwalt Corporation Compounds containing the 2,2,2-trichloroethyl group as flame retardants for polyurethanes
DE2820909A1 (de) 1978-05-12 1979-12-20 Lentia Gmbh Spirocyclische borverbindungen, herstellungsverfahren und flammhemmender zusatz
US4582885A (en) * 1978-07-20 1986-04-15 Minnesota Mining And Manufacturing Company Shaped plastic articles having replicated microstructure surfaces
US4247656A (en) * 1979-03-14 1981-01-27 Minnesota Mining And Manufacturing Company Poly(urethane-isocyanurate) foams
US4356273A (en) * 1979-04-30 1982-10-26 Minnesota Mining And Manufacturing Company Fluorochemical foam stabilizer and foamed polyurethanes made therewith
US4286072A (en) * 1979-10-15 1981-08-25 Texaco Development Corp. Novel polyisocyanurate catalysts
US4310634A (en) * 1979-10-15 1982-01-12 Texaco Development Corp. Novel polyisocyanurate catalyst
US4425446A (en) 1982-06-23 1984-01-10 Sealed Air Corporation Urea-modified isocyanurate foam, composition and method
US4542163A (en) * 1983-08-02 1985-09-17 Akzona Incorporated Method for the manufacture of polyisocyanurate foams
US4503167A (en) * 1983-08-02 1985-03-05 Akzona Incorporated Method for urethane-modified isocyanurate foams
US4640978A (en) * 1984-09-13 1987-02-03 Minnesota Mining And Manufacturing Company Foam-sealed electrical devices and method and composition therefor
DE3502265A1 (de) * 1985-01-24 1986-07-24 Bayer Ag, 5090 Leverkusen Urethangruppen aufweisende diisocyanate, ein verfahren zu ihrer herstellung und ihre verwendung als bindemittel bzw. bindemittelkomponente in polyurethanlacken
JPS63500490A (ja) * 1985-08-09 1988-02-18 ミネソタ マイニング アンド マニユフアクチユアリング カンパニ− 電気装置を密封する方法
IT1190432B (it) * 1985-12-10 1988-02-16 Montedison Spa Compositi ad alta densita' a base essenzialmente poliisocianurica
DE3811350A1 (de) * 1988-04-02 1989-10-19 Bayer Ag Verfahren zur herstellung von isocyanuratpolyisocyanaten, die nach diesem verfahren erhaltenen verbindungen und ihre verwendung
AT394370B (de) * 1990-04-24 1992-03-25 Chemie Linz Gmbh Verwendung von spirocyclischen borsaeureestern als flammhemmer in kunststoffen, flammhemmend ausgeruestete kunststoffe sowie spirocyclische borsaeureester
DE4015155A1 (de) * 1990-05-11 1991-11-14 Bayer Ag Verfahren zur herstellung von isocyanuratpolyisocyanaten, die nach diesem verfahren enthaltenen verbindungen und ihre verwendung
WO1993005109A1 (en) * 1991-09-05 1993-03-18 Minnesota Mining And Manufacturing Company Preparation of polyurethane compositions
US5212306A (en) * 1992-09-18 1993-05-18 Air Products And Chemicals, Inc. Amine-borate and amine-boron halide complexes as catalyst compositions for the production of polyurethanes
US5905151A (en) * 1993-02-18 1999-05-18 Bayer Corporation Trimer catalyst for aliphatic and aromatic isocyanates
DE19529406A1 (de) * 1995-08-10 1997-02-13 Henkel Kgaa Polyurethan-Prepolymer mit NCO-Gruppen
US6258918B1 (en) 1998-04-22 2001-07-10 3M Innovative Properties Company Flexible polyurethane material
JP5000713B2 (ja) * 2006-06-14 2012-08-15 ハンツマン・インターナショナル・エルエルシー 複合パネル
TW201113301A (en) * 2009-10-01 2011-04-16 Ind Tech Res Inst Multi-isocyanate prepolymer
EP3569624A1 (de) 2018-05-17 2019-11-20 Basf Se Verfahren zur herstellung von isocyanuratgruppen aufweisenden polyisocyanaten und ihre verwendung
EP3617243A1 (de) 2018-08-31 2020-03-04 Basf Se Verfahren zur herstellung von isocyanuratgruppen aufweisenden polyisocyanaten und ihre verwendung
EP4587494A1 (de) 2022-09-09 2025-07-23 Sika Technology AG Polyisocyanuratkunststoffe mit gummiähnlichen eigenschaften

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2993870A (en) * 1957-08-20 1961-07-25 Us Rubber Co Process of trimerizing organic isocyanates
US3127404A (en) * 1960-04-04 1964-03-31 Iriethylenediamine addition product
US3255131A (en) * 1961-05-10 1966-06-07 Minnesota Mining & Mfg Fluorochemical-containing varnishes
NL136661C (de) * 1962-08-09
NL297973A (de) * 1962-09-17
US3380943A (en) * 1963-12-05 1968-04-30 Pfersee Chem Fab Process for producing stable aqueous emulsions of compounds containing perfluoralkyl groups and emulsions produced
US3429856A (en) * 1964-09-14 1969-02-25 Du Pont Polyurethanes cured with 4,4'-methylene-bis-(o-trifluoromethylaniline)
US3284413A (en) * 1964-12-16 1966-11-08 Mobay Chemical Corp Prepolymer isocyanurate resins
GB1146661A (en) * 1965-04-29 1969-03-26 Ici Ltd Foamed polymers
US3413271A (en) * 1966-04-28 1968-11-26 Monsanto Res Corp Fluorine-containing polyurethane polymers
US3450755A (en) * 1967-02-23 1969-06-17 Minnesota Mining & Mfg Perfluoroalkyl sulfonamides and carboxamides
US3458571A (en) * 1967-04-06 1969-07-29 Minnesota Mining & Mfg Fluorocarbon polyamines
DE1770914A1 (de) * 1968-07-19 1972-01-13 Bayer Ag Kunststoffe auf Isocyanatbasis
US3635848A (en) * 1969-07-10 1972-01-18 Minnesota Mining & Mfg Isocyanurates, polyisocyanurates and polyurethanes and their preparation using as a catalyst a coordination compound of an organic borate ester and an alkali or alkaline earth metal

Also Published As

Publication number Publication date
DE2034171A1 (de) 1971-01-14
JPS5248160B1 (de) 1977-12-07
CH558398A (de) 1975-01-31
CH544129A (de) 1973-11-15
US3697485A (en) 1972-10-10
BE753204A (fr) 1971-01-11
FR2054389A5 (de) 1971-04-16
US3880782A (en) 1975-04-29
FR2054390A5 (de) 1971-04-16
DE2034166A1 (de) 1971-01-21
GB1317163A (en) 1973-05-16
GB1323312A (en) 1973-07-11
US3635848A (en) 1972-01-18

Similar Documents

Publication Publication Date Title
BE750797A (fr) Procede de preparation d'acylimidazoles et produits obtenus
BE782900A (fr) Procede de transformation d'alpha-acides en iso-alpha-acides etproduitsobtenus
BE788327A (fr) Procede et dispositif pour l'obtention de matieres premieres thermoplastiques ou produits analogues
BE748799A (fr) Procede de preparation de pyrimidinenucleosides et produits obtenus
BE744655A (fr) Solution aqueuse de produits de reaction d'un aminoalcoyl-silane et d'un aldehyde
GB1306835A (en) Method of making products comprising at least some parts made of stainless steel
RO70440A (ro) Procedeu de preparare a unui amestec de hidrochinona si pirocatehina
OA04270A (fr) Procédé et dispositif pour la fabrication des filets et autres structures lacunaires en matière plastique.
BE755397A (fr) Procede d'aromatisation et produits obtenus
IT1037018B (it) Prodotto di confetteria aerato e processo per la sua produzione
BE779043A (fr) Procede de production d'une sulfenamide et produit
BE761375A (fr) Procede pour l'obtention de melanges caoutchouteux et produits conformes a ceux obtenus
FR1379648A (fr) Procédé et produits pour favoriser le développement des animaux d'élevage
BE769324A (fr) Procede de preparation d'alcoylidenenorbornenes et produits obtenus
BE797440A (fr) Procede de melange d'acides
BE767418A (fr) Procede de production de nitriles non satures et produits obtenus
BE746211A (fr) Procede de preparation de 11alpha-hydroxy-3-oxo-delta 1,4- steroides, et produits obtenus
FR1447708A (fr) Procédé et dispositif pour le laminage et l'estampage de bandes de matière ainsi que produits conformes à ceux ainsi obtenus
BE780807A (fr) Procede d'hydrolyse de polyacrylamide solide, et produits obtenus
BE605734A (fr) Procédé de production d'antibiotiques et produits obtenus.
ZM10572A1 (en) Product and process
AU420429B2 (en) Method of making saccariferous animal feed and the resulting product
BE756234A (fr) Procede de production de matieres filamentaires elastiques et produits obtenus
BE760834R (fr) Procede et convertisseur d'affinage de
BE630874A (fr) Procédés de production d'isocyanates organiques et produits obtenus