公开(公告)号：AT163666T

公开(公告)日：1998-03-15

申请号：AT93116745

申请日：1993-10-16

Applicant: DEGUSSA

Inventor： NUN EDWIN DR ,  ARNOLDI DETLEF DR ,  SCHAUHOFF STEPHANIE DR

IPC: C08K5/09 ,  C08K5/098 ,  C08L59/00 ,  C08L71/00 ,  C08L75/04 ,  E03D9/00

公开(公告)号：AT138958T

公开(公告)日：1996-06-15

申请号：AT91116908

申请日：1991-10-04

Applicant: DEGUSSA

Inventor： ARNOLDI DETLEF DR ,  NUN EDWIN DR

IPC: C08K3/04 ,  C08K5/13 ,  C08L25/08 ,  C08L25/14 ,  C08L33/06 ,  C08L33/10 ,  C08L59/00 ,  C08L61/28

Abstract: Polyoxymethylene molding materials having improved thermal stability and reduced formaldehyde emission consisting essentially of a polyoxymethylene as the main component and containing in addition, relative in each instance to the weight of the polyoxymethylene, 0.1 to 10% by weight of an endocopolymerizate, 0.05 to 3% by weight of a phenolic antioxidant, 0 to 5% by weight carbon black and 0 to 3% by weight of further additives customary in polyoxymethylene molding materials.

公开(公告)号：DE4235958A1

公开(公告)日：1994-04-28

申请号：DE4235958

申请日：1992-10-24

Applicant: DEGUSSA

Inventor： NUN EDWIN DR ,  SCHAUHOFF STEPHANIE DR ,  ARNOLDI DETLEF DR

IPC: C08K5/09 ,  C08K5/098 ,  C08L59/00 ,  C08L71/00 ,  C08L75/04 ,  C08K5/3492 ,  C08L71/02

公开(公告)号：AT181342T

公开(公告)日：1999-07-15

申请号：AT95103823

申请日：1995-03-16

Applicant: DEGUSSA

Inventor： ARNOLDI DETLEF DR ,  GROPP UDO DR ,  NUN EDWIN DR

IPC: C08G2/28

Abstract: Process for working up crude polyoxymethylene (I) contg residual monomer, at least partly in the form of cyclic HCHO derivs, comprises dry treatment with an inert gaseous medium before opt stabilisation. The gaseous medium used contains at least 10 vol.% steam and less than 0.1 vol.% volatile base and/or less than 0.1 vol.% volatile solvent, so that (I) contg less than 2 wt% residual monomer is obtd..

公开(公告)号：DK0595137T3

公开(公告)日：1997-12-01

申请号：DK93116738

申请日：1993-10-16

Applicant: DEGUSSA

Inventor： SCHAUHOFF STEPHANIE DR ,  ARNOLDI DETLEF DR ,  NUN EDWIN DR

IPC: C08K5/09 ,  C08K5/3477 ,  C08K5/3492 ,  C08L59/00 ,  C08L61/28 ,  C08L71/02 ,  C08L75/04

Abstract: 2.1. Polyoxymethylene (polyacetal) is an excellent material from which, in particular, rigid articles can be produced in high accuracy. However, since polyoxymethylene is acid-sensitive, the object of the present invention is to provide a polyoxymethylene which has been stabilised towards acids and from which, in particular, fine or filigree mouldings can be injection-moulded. 2.2. By addition of melamine cyanurate, polyoxymethylene is stabilised against acid attack, where, in particular, as little as 3 parts of MCA per 100 parts of POM are effective. The weight loss of a stabilised POM can be less than 3% compared with an unstabilised POM on exposure to acid. 2.3. Areas of application in which the products are exposed to acidic agents, such as irrigation equipment, dishwashers and to the sanitary sector.

公开(公告)号：ES2105040T3

公开(公告)日：1997-10-16

申请号：ES93116738

申请日：1993-10-16

Applicant: DEGUSSA

Inventor： SCHAUHOFF STEPHANIE DR ,  ARNOLDI DETLEF DR ,  NUN EDWIN DR

IPC: C08K5/09 ,  C08K5/3477 ,  C08K5/3492 ,  C08L59/00 ,  C08L61/28 ,  C08L71/02 ,  C08L75/04

Abstract: 2.1. Polyoxymethylene (polyacetal) is an excellent material from which, in particular, rigid articles can be produced in high accuracy. However, since polyoxymethylene is acid-sensitive, the object of the present invention is to provide a polyoxymethylene which has been stabilised towards acids and from which, in particular, fine or filigree mouldings can be injection-moulded. 2.2. By addition of melamine cyanurate, polyoxymethylene is stabilised against acid attack, where, in particular, as little as 3 parts of MCA per 100 parts of POM are effective. The weight loss of a stabilised POM can be less than 3% compared with an unstabilised POM on exposure to acid. 2.3. Areas of application in which the products are exposed to acidic agents, such as irrigation equipment, dishwashers and to the sanitary sector.

公开(公告)号：AT154625T

公开(公告)日：1997-07-15

申请号：AT93116738

申请日：1993-10-16

Applicant: DEGUSSA

Inventor： SCHAUHOFF STEPHANIE DR ,  ARNOLDI DETLEF DR ,  NUN EDWIN DR

IPC: C08K5/09 ,  C08K5/3477 ,  C08K5/3492 ,  C08L59/00 ,  C08L61/28 ,  C08L71/02 ,  C08L75/04

Abstract: 2.1. Polyoxymethylene (polyacetal) is an excellent material from which, in particular, rigid articles can be produced in high accuracy. However, since polyoxymethylene is acid-sensitive, the object of the present invention is to provide a polyoxymethylene which has been stabilised towards acids and from which, in particular, fine or filigree mouldings can be injection-moulded. 2.2. By addition of melamine cyanurate, polyoxymethylene is stabilised against acid attack, where, in particular, as little as 3 parts of MCA per 100 parts of POM are effective. The weight loss of a stabilised POM can be less than 3% compared with an unstabilised POM on exposure to acid. 2.3. Areas of application in which the products are exposed to acidic agents, such as irrigation equipment, dishwashers and to the sanitary sector.

公开(公告)号：ES2087941T3

公开(公告)日：1996-08-01

申请号：ES91116908

申请日：1991-10-04

Applicant: DEGUSSA

Inventor： ARNOLDI DETLEF DR ,  NUN EDWIN DR

IPC: C08K3/04 ,  C08K5/13 ,  C08L25/08 ,  C08L25/14 ,  C08L33/06 ,  C08L33/10 ,  C08L59/00 ,  C08L61/28

Abstract: Polyoxymethylene molding materials having improved thermal stability and reduced formaldehyde emission consisting essentially of a polyoxymethylene as the main component and containing in addition, relative in each instance to the weight of the polyoxymethylene, 0.1 to 10% by weight of an endocopolymerizate, 0.05 to 3% by weight of a phenolic antioxidant, 0 to 5% by weight carbon black and 0 to 3% by weight of further additives customary in polyoxymethylene molding materials.

公开(公告)号：DE4409744A1

公开(公告)日：1995-09-28

申请号：DE4409744

申请日：1994-03-22

Applicant: DEGUSSA

Inventor： ARNOLDI DETLEF DR ,  GROPP UDO DR ,  NUN EDWIN DR

IPC: C08G2/28 ,  C08G2/08 ,  C08G2/10 ,  C08G2/18

Abstract: Process for working up crude polyoxymethylene (I) contg residual monomer, at least partly in the form of cyclic HCHO derivs, comprises dry treatment with an inert gaseous medium before opt stabilisation. The gaseous medium used contains at least 10 vol.% steam and less than 0.1 vol.% volatile base and/or less than 0.1 vol.% volatile solvent, so that (I) contg less than 2 wt% residual monomer is obtd..

公开(公告)号：DE59506191D1

公开(公告)日：1999-07-22

申请号：DE59506191

申请日：1995-03-16

Applicant: DEGUSSA

Inventor： ARNOLDI DETLEF DR ,  GROPP UDO DR ,  NUN EDWIN DR

IPC: C08G2/28

Abstract: Process for working up crude polyoxymethylene (I) contg residual monomer, at least partly in the form of cyclic HCHO derivs, comprises dry treatment with an inert gaseous medium before opt stabilisation. The gaseous medium used contains at least 10 vol.% steam and less than 0.1 vol.% volatile base and/or less than 0.1 vol.% volatile solvent, so that (I) contg less than 2 wt% residual monomer is obtd..