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    Molding compositions of polyoxymethylenes and glass fibers
    1.
    发明授权
    Molding compositions of polyoxymethylenes and glass fibers 失效
    聚甲基乙烯和玻璃纤维的成型组合物

    公开(公告)号：US3850873A

    公开(公告)日：1974-11-26

    申请号：US33764173

    申请日：1973-03-02

    Applicant: BASF AG

    Inventor： WERTHER H ,  SCHMIDT F ,  WURMB R ,  SCHUETTE W

    IPC: C08L59/02 ,  C08L75/04 ,  C08G41/04

    CPC classification number: C08L59/02 ,  C08L75/04

    Abstract: 1. AN IMPROVED THERMOPLASTIC MOLDING COMPOSITION OF POLYOXYMETHYLENES SELECTED FROM THE GROUP CONSISTING OF HOMOPOLYMERS OF FORMALDEHYDE AND COPOLYMERS OF FORMALDEHYDE OR TRIOXANE, SAID HOMOPOLYMERS HAVING THERMALLY STABLE END GROUPS AND SAID COPOLYMERS CONTAINING MORE THAN ABOUT 50% OF OXYMETHYLENE GROUPS AND AT LEAST ABOUT 0.1% OF THE COMONOMER HAVING AT LEAST TWO VICINAL CARBON ATOMS, FROM 10 TO 60% BY WEIGHT OF GLASS FIBERS, AND FROM 0.5 TO 10% BY WEIGHT, BASED ON THE TOTAL WEIGHT OF THE MIXTURE, OF A HIGH MOLECULAR WEIGHT POLYURETHANE EXHIBITING THERMOPLASTIC PROPERTIES, SAID POLYURETHANE HAVING BEEN PREPARED FROM POLYESTERS, POLYETHERS SUCH AS POLYETHYLENEGLYCOL ETHERS, POLYPROPYLENEGLYCOL ETHERS OR POLYACETALS HAVING FREE HYDROXYL END GROUPS AND POLYISOCYANATES USING CHAIN-EXTENDING AGENTS SUCH AS LOW MOLECULAR WEIGHT POLYOLS.

    Production of butanediolformal
    2.
    发明授权
    Production of butanediolformal 失效
    生产丁二醛

    公开(公告)号：US3849444A

    公开(公告)日：1974-11-19

    申请号：US13992271

    申请日：1971-05-03

    Applicant: BASF AG

    Inventor： FUCHS H ,  RICKER E ,  SCHMIDT F ,  SCHWARTZ E ,  SPERBER H

    IPC: C07D17/00

    Abstract: 1. IN A PROCESS FOR THE PRODUCTION OF 1,4-BUTANEDIOLFORMAL WHEREIN A MIXTURE OF BUTANEDIOL-1,4M AN AQUEOUS SOLUTION OF FORMALDEHYDE OT A SUBSTANCE YIELDING FORALDEHYDE, AND AN ACID OR ACID SALT IS HEATED IN A REACTION VESSEL, THE IMPROVEMENT WHICH COMPRISES CONTINUOUSLY (A) HEATING AT THE BOIL A CONSTANT AMOUNT OF SAID REACTION MIXTURE WHICH CONTAINS LESS THAN 1% BY WEIGHT OF A STRONG ACID OR LESS THAN 10% BY WEIGHT OF AN ACID SALT OR A WEAK ACID, (B) EVAPORATING THE PRODUCT OF THE SYNTHESIS FROM THE REACTION MIXTURE AT SUCH A VELOCITY THAT A MEAN RESIDUE TIME IN THE REACTION VESSEL OF LESS THAN 240 MINUTES IS SET UP FOR A REACTION MIXTURE, (C) CONDENSING THE VAPORS OF THE PRODUCT OF THE SYNTHESIS, (D) SEPARATING THE TWO LAYERS WHICH FORM IN A LIQUID CONDENSATE, (E) SUBJECTING THE UPPER LAYER TO TREATMENT WITH ALKALI, PASSING SAID LAYER THROUGH AN EVAPORATOR AND THEREAFTER FRACTIONALLY DISTILLING SAID TREATED LAYER, AND (F) SUBJECTING THE LOWER LAYER TO AZEOTROPIC DISTILLATION AND RECYCLING THE THE DISTILLATE TO THE UNCONDENSED PRODUCT STREAM WHICH LEAVES THE REACTION VESSEL.

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