摘要:
NEW 1,3-DI-($-ISOCYANATOPROPYL)-HYDANTOINS AND -DIHYURACILS, FOR EXAMPLE 1,3-DI-($-ISOCYANATOPROPYL)-5,5-DIMETHYLHYDANTOIN OR 1,3-DI-($-ISOCYANATOPROPYL)5,5-DIMETHYL-5,6-DIHYDROURACIL AND THEIR USE FOR THE MANUFACTURE OF POLYURETHANES BY REACTION WITH POLYHYDROXYL COMPOUNDS. THE NEW DIISOCYANATES ARE COMPLETELY ODOURLESS; IRRITATION OF THE MUCUS MEMBRANES WAS NOT DETECTABLE; THEY ARE THEREFORE PREDERABLY USED IN THE LAQUER FIELD. THE NEW DIISOCYANATES REACT SIGNIFICANTLY MORE RAPIDLY WITH PRIMARY ALCOHOLS THAN DO ALIPHATIC DIISOCYANATES, FOR EXAMPLE 1,6-HEXAMETHYLENEDIISOCYANATE, AND ON THE OTHER HAND MORE SLOWLY THAN AROMATIC DIISOCYANATES, FOR EXAMPLE, 1,4-TOLUYLENEDIISOCYANATE.
摘要:
LIGHT-COLORED, TECHNICALLY VALUABLE VULCANISATES ARE OBTAINED ACCORDING TO THE INVENTION WHEN NATURAL OR SYNTHETIC RUBBER IS VULCANISED IN THE PRESENCE OF INSOLUBLE AND INFUSIBLE, FINELY DISPERSED AMINOPLASTS HAVING AN INNER SURFACE OF MORE THAN 10 SQUARE METERS PER GRAM AND AN AVERAGE PARTICLE SIZE SMALLER THAN 5U.
摘要:
CURABLE B-STAGE FROM (1) A POLYEPOXIDE WITH AT LEAST ONE CARBOCYCLIC OR HETEROCYCLIC RING (FOR EXAMPLE ARALDIT CY 175, TRIGLYCIDYL ISOCYANURATE OR CASTING RESIN F), (2) A POLYESTER CONTAINING AT LEAST ONE CARBOCYCLIC OR HETEROCYCLIC RING, WITH TERMINAL CARBOXYL GROUPS, WITH THE RATIO OF THE TOTAL CHAIN MEMBERS ZG TO RING MEMBERS ZR HAVING TO BE 2 TO 13, AND WITH THE CHAIN POSSESSING 2-10 RECURRING STRUCTURAL ELEMENTS (FOR EXAMPLE POLYESTERS FROM PHTHALIC ANHYDRIDE AND ETHYLENE GLYCOL 11:10 OR FROM SUCCINIC ACID AND 1,1-BIS(HYDROXYMETHYL)-CYCLOHEXANE 5:4) IN AMOUNTS OF 0.2-0.8 EQUIVALENT PER 1 EPOXIDE EQUILVALENT, AND (3) A POLYCARBOXYLIC ACID ANHYDRIDE CONTAINING A CARBOCYCLIC RING (PHTHALIC ANHYDRIDE, HEXAHYDROPHTALIC ANHYDRIDE) IN AN AMOUNT OF 0.8-0.2 EQUIVALENT PER 1 EPOXIDE EQUIVALENT.
摘要:
CRYSTALLINE POLYMERS ARE PREPARED BY THE FORMATION OF ADDUCTS FROM DIEPOXIDES, PREFERABLY DIGLYCIDYL ETHERS OF DIPHENOLS, SUCH AS BISPHENOL A AND ACID POLYESTER OF SUCCINIC ACID AND 1,4-BUTANEDIOL (THE RECURRENT STRUCTURAL UNIT OF THE FORMULA-0-(CH2)4-OCO(CH2)2-COMUST OCCUR AT LEAST SIX TIMES IN THE CHAIN). THE RATIO OF EPOXIDE GROUPS OF THE DIEPOXIDE TO CARBOXYL GROUPS OF THE POLYESTER IS 1:07 TO 1.2, PREFERABLE ABOUT 1:1. ADVANTAGEOUSLY, A PORTION OF THE DICARBOXYLIC ANHYDRIDES (FOR EXAMPLE A DODECENYLSUCCINIC ANHYDRIDE) IS CONCOMITANTLY USED AS CHAIN CROSS-LINKING AGENT. OF ADVANTAGE IS FOR EXAMPLE AN EQUIVALENT RATIO OF 1.3 EPOXIDE GROUP: 190 CARBOXYL GROUP+0.2 ANHYDRIDE GROUP. AFTER STRETCHING, THE POLYMERS HAVE A TENSILE STRENGTH OF 7001000 KG./CM.2 AND AN ELONGATION AT BREAK OF 50-150%. ABOVE THE CRYSTALLIZATION TRANSITION TEMPERATURE, THEY ARE RUBBER-ELASTIC. THEY ARE USED, FOR EXAMPLE, AS POTTING AND SEALING COMPOUNDS OR FOR THE MANUFACTURE OF FIBERS, RIBBONS, FOILS.
摘要:
NEW, SO-CALLED "ADVANCED" ADDUCTS CONTAINING EPOXIDE GROUPS, FROM POLYEPOXIDE COMPOUNDS CONTAINING ON AN AVERAGE MORE THAN ONE EPOXIDE GROUP IN THE MOLECULE AND MONONUCLEAR, FIVE- OR SIX-MEMBERED, UNSUBSTITUTED OR SUBSTITUTED N-HETEROCYLIC COMPOUND WHOSE MOLECULE CONTAINS TWO ENDOCYCLIC NH GROUPS, AND LESS THAN ONE EQUIVALENT NH GROUP FOR EVERY EPOXIDE GROUP EQUIPVALENT OF THE POLYEPOXIDE COMPOUND, OBTAINED BY REACTION OF FOR EXAMPLE 2 MOLS OF DIOMETHANEDIGLYCIDYL EHTER AND 1 MOL OF 5,5-DIMETHYLHYDANTOIN. THE EPOXIDE RESINS "ADVANCED" WITH THE AID OF SUCH NITROGEN COMPOUNDS HAVE A GOOD STORAGE STABLITY IN ADDITION TO EXCELLENT ELECTRICAL PROPERTIES.
摘要:
HEAT-CURABLE EPOXIDE RESIN MIXTURES OF (1) A CYCLOALIPHATIC POLYEPOXIDE COMPOUND WHICH POSSESS AT LEAST ONE 1,2-EPOXIDE GROUP LOCATED ON A CARBOCYCLIC FIVEMEMBERED OR SIX-MEMBERED RING, (2) A POLYCARBOXYLIC ACID ANHYDRIDE (0.2-1.1 ANHYDRIDE GROUPS PER 1 EQUIVALENT OF EPOXIDE GROUPS) AND (3) A POLYESTER CONTAINING TERMINAL CARBOXYL AND/OR HYDROXYL GROUPS WHICH IS OBTAINED BY ESTERIFICATION OF ALIPHATIC-CYCLOALIPHATIC HIGHER DICARBOXYLIC ACIDS (MANUFACTURED BY DIMERIZATION OF UNSATURATED MONOMERIC FATTY ACID HAVING 14-24 CARBON ATOMS IN THE MOLECULE, PREFERABLY 16-18, AND OPTIONALLY SUBSEQUENT HYDROGENATION OF SUCH A DIMERIC FATTY ACID) WITH ALIPHATIC DIOLS (0.02-0.4 MOL OF POLYESTER PER 1 EQUIVALENT OF EPOXIDE GROUPS). THE CURING OF THE MIXTURES YIELDS FLEXIBLE, IMPACT-RESISTANT MOULDING, THE MECHANICAL PROPERTIES OF WHICH ARE LARGELY TEMPERATURE-INDEPENDENT.