公开(公告)号：DE2735946A1

公开(公告)日：1979-02-15

申请号：DE2735946

申请日：1977-08-10

Applicant: HOECHST AG

Inventor： BURG KARLHEINZ DIPL CHEM DR ,  HELLER ALWIN ,  SABEL HANS-DIETER DIPL CHEM DR ,  SCHLAF HELMUT DIPL CHEM DR ,  SEXTRO GUENTER DIPL CHEM DR

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

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.

公开(公告)号：DK140850B

公开(公告)日：1979-11-26

申请号：DK496675

申请日：1975-11-05

Applicant: HOECHST AG

Inventor： SEXTRO GUENTER ,  BURG KARLHEINZ ,  LEUGERING HANS JOACHIM ,  SCHLAF HELMUT ,  HELLER ALWIN

IPC: C08G2/00 ,  C08J3/14 ,  C08J3/16 ,  C08L59/00

Abstract: Oxymethylene polymers (POM) are obtained in granular form by cooling a POM solution or dispersion having a temperature above the sintering temperature of the POM in two stages to a temperature just below the said sintering temperature. The solvent or dispersion agent used is a mixture of methanol and water and the cooling agent is a methanol/water mixture which may contain POM suspended therein. The granular POM obtained is suitable as technical material for making shaped articles.

公开(公告)号：DE2508886A1

公开(公告)日：1976-09-09

申请号：DE2508886

申请日：1975-02-28

Applicant: HOECHST AG

Inventor： SEXTRO GUENTER DIPL CHEM DR ,  BURG KARLHEINZ DIPL CHEM DR ,  SCHLAF HELMUT DIPL CHEM DR ,  LEUGERING HANS-JOACHIM DIPL CH ,  HELLER ALWIN

IPC: C08G2/00 ,  B29B9/00 ,  B29B9/12 ,  B29B9/16 ,  C08G2/30 ,  C08J3/12 ,  C08J3/10

公开(公告)号：CA1076291A

公开(公告)日：1980-04-22

申请号：CA277735

申请日：1977-05-05

Applicant: HOECHST AG

Inventor： SEXTRO GUNTER ,  BURG KARLHEINZ ,  SCHLAF HELMUT ,  SABEL HANS-DIETER ,  HELLER ALWIN

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

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：CA1055192A

公开(公告)日：1979-05-22

申请号：CA246680

申请日：1976-02-27

Applicant: HOECHST AG

Inventor： SEXTRO GUNTER ,  BURG KARLHEINZ ,  SCHLAF HELMUT ,  LEUGERING HANS J ,  HELLER ALWIN

IPC: C08G2/00 ,  B29B9/00 ,  B29B9/12 ,  B29B9/16 ,  C08G2/30 ,  C08J3/12 ,  C08G2/28

Abstract: PROCESS FOR PREPARING OXYMETHYLENE POLYMERS IN A GRANULAR FORM of the disclosure: Oxymethylene polymers are obtained in a granular form by cooling a solution or dispersion of an oxymethylene polymer, the temperature of which solution or dispersion is above the sintering temperature of the oxymethylene polymer, to a temperature just below the sintering temperature of the oxymethylene polymer. As dissolving or dispersing agent as well as precipitating and cooling agent there is used a mixture of methanol and water having a methanol content of at least 75% by weight. The oxymethylene polymer obtained is suitable as engineering plastic for preparing moulded articles.

公开(公告)号：DE2620017A1

公开(公告)日：1977-11-17

申请号：DE2620017

申请日：1976-05-06

Applicant: HOECHST AG

Inventor： SEXTRO GUENTER DIPL CHEM DR ,  BURG KARLHEINZ DIPL CHEM DR ,  SCHLAF HELMUT DIPL CHEM DR ,  SABEL HANS-DIETER DIPL CHEM DR ,  HELLER ALWIN

IPC: D01F6/66 ,  C08G2/00 ,  C08G2/18 ,  C08G2/28 ,  C08G2/30 ,  C08G2/38 ,  C08J3/12 ,  C08J3/14 ,  C08L59/02

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：CA1067245A

公开(公告)日：1979-11-27

申请号：CA239373

申请日：1975-11-06

Applicant: HOECHST AG

Inventor： SEXTRO GUNTER ,  BURG KARLHEINZ ,  LEUGERING HANS J ,  SCHLAF HELMUT ,  HELLER ALWIN

IPC: C08G2/00 ,  C08J3/14 ,  C08J3/16 ,  C08G2/28 ,  C08J3/12

Abstract: POLYMERS of the disclosure: Oxymethylene polymers (POM) are obtained in granular form by cooling a POM solution or dispersion having a temperature above the sintering temperature of the POM in two stages to a temperature just below the said sintering temperature. The solvent or dispersion agent used is a mixture of methanol and water and the cooling agent is a methanol/water mixture which may contain POM suspended therein. The granular POM obtained is suitable as technical material for making shaped articles.

公开(公告)号：DE2509924A1

公开(公告)日：1976-09-16

申请号：DE2509924

申请日：1975-03-07

Applicant: HOECHST AG

Inventor： SEXTRO GUENTER DIPL CHEM DR ,  BURG KARLHEINZ DIPL CHEM DR ,  SCHLAF HELMUT DIPL CHEM DR ,  HELLER ALWIN

IPC: C08J3/14 ,  C08J3/16 ,  C08L59/00

Abstract: Oxymethylene copolymers contg. 0.1-20 wt.% 2-8C oxyalkylene units, apart from oxymethylene units, in the main chain, are obtd. as grains by cooling a solution or dispersion of the polymer in a methanol/water mixt. having a temp. 5-65 degrees C higher than the fritting temp. (Tf) of the polymer, the cooling being effected in 2 stages, first at a temp. higher than Tf by 0-10 degrees C and then at a temp. lower than Tf by 1-10 degrees C. The polymer grains are separated and dried. The grains formed contain a max. of 15 wt. % particles of 0.2 mm max. dia. and >=50 wt. % particles of >=0.4 mm dia. Bulk density is generally >300, pref. 350-550 g/l.

公开(公告)号：DE2504482A1

公开(公告)日：1976-08-19

申请号：DE2504482

申请日：1975-02-04

Applicant: HOECHST AG

Inventor： SEXTRO GUENTER DIPL CHEM DR ,  BURG KARLHEINZ DIPL CHEM DR ,  LEUGERING HANS-JOACHIM DIPL CH ,  SCHLAF HELMUT DIPL CHEM DR ,  HELLER ALWIN

IPC: C08J3/14 ,  C08J3/16 ,  C08L59/02

Abstract: Oxymethylene copolymers contg. 0.1-20 wt.% 2-8C oxyalkylene units, apart from oxymethylene units, in the main chain, are obtd. as grains by cooling a solution or dispersion of the polymer in a methanol/water mixt. having a temp. 5-65 degrees C higher than the fritting temp. (Tf) of the polymer, the cooling being effected in 2 stages, first at a temp. higher than Tf by 0-10 degrees C and then at a temp. lower than Tf by 1-10 degrees C. The polymer grains are separated and dried. The grains formed contain a max. of 15 wt. % particles of 0.2 mm max. dia. and >=50 wt. % particles of >=0.4 mm dia. Bulk density is generally >300, pref. 350-550 g/l.

公开(公告)号：CH628657A5

公开(公告)日：1982-03-15

申请号：CH551477

申请日：1977-05-03

Applicant: HOECHST AG

Inventor： SEXTRO GUENTER DR ,  BURG KARLHEINZ DR ,  SCHLAF HELMUT DR ,  SABEL HANS-DIETER DR ,  HELLER ALWIN

IPC: D01F6/66 ,  C08G2/00 ,  C08G2/18 ,  C08G2/28 ,  C08G2/30 ,  C08G2/38 ,  C08J3/12 ,  C08J3/14 ,  C08L59/04