公开(公告)号：JPH1087958A

公开(公告)日：1998-04-07

申请号：JP23359097

申请日：1997-08-29

Applicant: DEGUSSA

Inventor： KELLER BRUNO DR ,  SCHAUHOFF STEPHANIE DR ,  DORN KLAUS DR ,  DIETRICH MICHELCHEN ,  HARTMUT ALT

IPC: C08K5/13 ,  C08K5/134 ,  C08L59/00

Abstract: PROBLEM TO BE SOLVED: To efficiently carry out stabilization of a polyacetal subjected to oxidative decomposition and obtain a high-quality molding material, by mixing the polyacetal with a specific sterically hindering phenol ester of dialkylene glycol in an acting amount. SOLUTION: A polyacetal such as polyoxymethylene is mixed with preferably 0.05-2wt.% (based on polyacetal) sterically hindering phenol ester of dialkylene glycol represented by the formula to stabilize the polyacetal subjected to oxidative decomposition according to ordinary method.

公开(公告)号：SG74630A1

公开(公告)日：2001-07-24

申请号：SG1998001127

申请日：1998-05-23

Applicant: DEGUSSA

Inventor： JORG SAUER ,  THOMAS HAAS ,  BRUNO KELLER ,  ANDREAS FREUND ,  DIETRICH MICHELCHEN ,  MONKIA BERWEILER

IPC: B01J25/00 ,  B01J37/00 ,  C07B31/00 ,  C07B61/00 ,  C07C209/48

Abstract: A formed metal solid-bed catalyst, consisting entirely of catalyst alloy (and possibly promoters) with a total pore vol. of 0.1-0.6 ml/g and with a surface shell 0.1-2.0 mm thick which is activated by complete or partial leaching of an extractable alloy component (I). Also claimed is a process for the production of thE catalyst . Preferably the catalyst metal is nickel, cobalt, copper and/or iron, and component (I) is aluminium, zinc or silicon. The catalyst may also contain up to 15 wt% chromium, iron, cobalt, tantalum, molybdenum and/or titanium as promoters.