公开(公告)号：DK199477A

公开(公告)日：1977-11-07

申请号：DK199477

申请日：1977-05-05

Applicant: HOECHST AG

Inventor： SEXTRO G ,  BURG K ,  SCHLAF H ,  SABEL H D ,  HELLER A

IPC: D01F6/66 ,  C08G2/00 ,  C08G2/18 ,  C08G2/28 ,  C08G2/30 ,  C08G2/38 ,  C08J3/12 ,  C08J3/14 ,  C08G

Abstract: of the disclosure: Granular oxymethlene polymers are prepared by cooling a solution or dispersion of an oxymethylene polymer, the temperature of the said solution of dispersion polymer, to a temperature just below the said sintering temperature. As dissolving or dispersing agent there is used a mixture of methanol and water. The cooling of the said solution of dispersion is effected in two stages while using a liquid cooling agent or a cooling device. After precipitation the coarse-granular polymer is separated from the fine-granular portion. It is suitable as engineering plastic for preparing molded articles.

公开(公告)号：AU507704B2

公开(公告)日：1980-02-21

申请号：AU2489277

申请日：1977-05-05

Applicant: HOECHST AG

Inventor： SEXTRO G ,  BURG K ,  SCHLAF H ,  SABEL H D ,  HELLER A

IPC: D01F6/66 ,  C08G2/00 ,  C08G2/18 ,  C08G2/28 ,  C08G2/30 ,  C08G2/38 ,  C08J3/12 ,  C08J3/14

公开(公告)号：DK351578A

公开(公告)日：1979-02-11

申请号：DK351578

申请日：1978-08-09

Applicant: HOECHST AG

Inventor： BURG K ,  HELLER A ,  SABEL H D ,  SCHLAF H ,  SEXTRO G

IPC: C08J3/14 ,  C08J3/12 ,  C08L59/04 ,  C08J

Abstract: Oxymethylene polymers (POM) are obtained in a granular form, by cooling a POM solution or dispersion, whose temperature is above the sintering temperature of the POM, to a temperature slightly below the sintering temperature of the POM, and extracting from the suspension obtained only those POM particles which show a grain diameter of more than 70 mu m. As solvent or dispersing agent as well as precipitating and cooling agent there is used a mixture of methanol and water with a methanol content of at least 75% by weight. The POM obtained is suitable as engineering plastic material for the manufacture of shaped articles having improved mechanical properties.