公开(公告)号：US3629101A

公开(公告)日：1971-12-21

申请号：US3629101D

申请日：1969-02-25

Applicant: HOECHST AG

Inventor： HILLE MARTIN ,  ULMSCHNEIDER DIETER

IPC: C09K8/24 ,  C10M7/00 ,  E21B21/04

CPC classification number: C09K8/24

Abstract: Water-base, clayey drilling fluids are made suitable for the drilling of deep wells by addition thereto of a copolymer of vinyl-sulfonic acid and an N-vinyl-carboxylic acid amide or Nvinyl-pyrrolidone and, optionally, a small proportion of an anion-active vinyl compound that is polymerizable under the action of free radicals.

公开(公告)号：US3597314A

公开(公告)日：1971-08-03

申请号：US3597314D

申请日：1968-11-27

Applicant: HOECHST AG

Inventor： LAUBE KARLHEINZ ,  ULMSCHNEIDER DIETER ,  NISCHWITH EHRENFRIED

IPC: D21H17/45 ,  D21D3/00 ,  D21H3/40

CPC classification number: D21H17/45

Abstract: DEWATERING OF AQUEOUS CELLULOSE FIBER SUSPENSION IN THE FORMATION OF PAPER IS IMPROVED BY ADDING TO THE SUSPENSION FROM 0.05 TO 4% OF A WATER SOLUBLE POLYMER CONSISTING ESSENTIALLY OF UNITS DERIVED FROM N-VINYL-N-METHYLFORMAMIDE, SUCH AS N-VINYL-N-METHYL FORMAMIDE, HAVING 60-100% OF THE FORMIC ACID RADICALS OF THE POLYMER SPLIT OFF BY ACID HYDROLYSIS.

公开(公告)号：US3558581A

公开(公告)日：1971-01-26

申请号：US3558581D

申请日：1968-10-11

Applicant: HOECHST AG

Inventor： BEERMANN CLAUS ,  SCHNABEL HORST ,  ULMSCHNEIDER DIETER

IPC: C08F8/00 ,  C08F3/84 ,  C08F3/86 ,  C08F3/90

CPC classification number: C08F8/12 ,  C08F2800/20 ,  C08F20/54

Abstract: POLY-N-VINLY-N-METHYLAMINE AND COPOLYMERS OF NVINYL-N-METHYLAMINE WITH COMPOUNDS POLYMERIZABLE UNDER THE ACTION OF A FREE RADICAL LIBERATING CAYALYST ARE PRODUCED BY HYDROLYSIS OF HOMO- OR COPOLYMERS OF NVINYL-N-METHYLFORMAIMIDE WITH MINERIAL ACIDES.