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公开(公告)号：CA1110009A
公开(公告)日：1981-10-06
申请号：CA322225
申请日：1979-02-23
Applicant: SNIA VISCOSA
Inventor： LEONI ROBERTO , BALDINI ALBERTO , ANGELINI GIANFRANCO
Abstract: : A process for the preparation of solutions of cellulose dericatives from which formed bodies, such as fibres or films, of regenerated cellulose can be obtained by coagulation and regeneration, e.g. by wet spinning, is disclosed. The cellulose is transformed into a methylol derivative containing more than 2 units of formaldehyde per anydroglucosidic unit, which derivative is soluble in organic solvents of the class consisting of polar aprotic solvents constituted by N-substituted amides pyridine and formamide. The methylol derivative is prepared by treating cellulose with paraformaldehyde and dimethylsulphoxide. The methylol derivative is then dissolved in one of the aforesaid solvents, preferably dimethylformamide od dimethylacetamide, to provide spinnable viscous solutions from which formed bodies can be obtained, e.g. by spinning in an aqueous alkaline bath.
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公开(公告)号：DE3021146A1
公开(公告)日：1980-12-18
申请号：DE3021146
申请日：1980-06-04
Applicant: SNIA VISCOSA
Inventor： LEONI ROBERTO , BALDINI ALBERTO , CALLONI ANGELO , ANGELINI GIANFRANCO , BUSCATE MAILAND
Abstract: A process for the preparation of high concentration solutions of cellulose derivatives in organic solvents comprises contacting with paraformaldehyde and the solvent a cellulose which has a polymerization degree lower than 300 and preferably not significantly higher than 200. The solvent is selected from among dimethylformamide, dimethylacetamide and N-methylpyrrolidone.
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公开(公告)号：IT1194603B
公开(公告)日：1988-09-22
申请号：IT2830679
申请日：1979-12-21
Applicant: SNIA VISCOSA
Inventor： BALDINI ALBERTO , LEONI ROBERTO , CALLONI ANGELO , ANGELINI GIANFRANCO
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公开(公告)号：DE3111276A1
公开(公告)日：1982-03-04
申请号：DE3111276
申请日：1981-03-19
Applicant: SNIA VISCOSA
Inventor： LEONI ROBERTO , BALDINI ALBERTO , ANGELINI GIANFRANCO
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公开(公告)号：FR2478645A1
公开(公告)日：1981-09-25
申请号：FR8105537
申请日：1981-03-19
Applicant: SNIA VISCOSA
Inventor： LEONI ALBERTO , BALDINI ALBERTO , ANGELINI GIANFRANCO
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Patent Agency Ranking
公开(公告)号：FR2458558A1
公开(公告)日：1981-01-02
申请号：FR8012675
申请日：1980-06-06
Applicant: SNIA VISCOSA
Inventor： LEONI ROBERTO , BALDINI ALBERTO , CALLONI ANGELO , ANGELINI GIANFRANCO
Abstract: A process for the preparation of high concentration solutions of cellulose derivatives in organic solvents comprises contacting with paraformaldehyde and the solvent a cellulose which has a polymerization degree lower than 300 and preferably not significantly higher than 200. The solvent is selected from among dimethylformamide, dimethylacetamide and N-methylpyrrolidone.
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公开(公告)号：DE2929946A1
公开(公告)日：1980-02-14
申请号：DE2929946
申请日：1979-07-24
Applicant: SNIA VISCOSA
Inventor： LEONI ROBERTO , BALDINI ALBERTO , ANGELINI GIANFRANCO
Abstract: A process for the preparation of regenerated cellulose formed bodies from solutions of cellulose derivatives in organic solvents is disclosed. The cellulose derivatives is firstly precipitated in a coagulating bath constituted of a cellulose non-solvent, non-regenerating organic liquid, then the coagulated body is drawn in subsequent baths and the cellulose is regenerated. The drawing and the regeneration occur, at least in part, concurrently.
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公开(公告)号：DE2929922A1
公开(公告)日：1980-02-14
申请号：DE2929922
申请日：1979-07-24
Applicant: SNIA VISCOSA
Inventor： BALDINI ALBERTO , LEONI ROBERTO , CALLONI ANGELO , ANGELIN GIANFRANCO
Abstract: A process for the preparation of formed bodies of regenerated cellulose from cellulose derivative solutions in dimethylsulphoxide is disclosed. The solution is extruded and coagulated in a coagulating bath which is a saline acqueous solution having a substantially non-alkaline or preferably a substantially neutral reaction, a formed body being thus produced.
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公开(公告)号：DE3021145A1
公开(公告)日：1980-12-18
申请号：DE3021145
申请日：1980-06-04
Applicant: SNIA VISCOSA
Inventor： BALDINI ALBERTO , LEONI ROBERTO , ANGELINI GIANFRANCO
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公开(公告)号：IT1192247B
公开(公告)日：1988-03-31
申请号：IT2054078
申请日：1978-02-24
Applicant: SNIA VISCOSA
Inventor： LEONI ROBERTO , BALDINI ALBERTO , ANGELINI GIANFRANCO
Abstract: A process for the preparation of solutions of cellulose derivatives from which formed bodies, such as fibres or films, of regenerated cellulose can be obtained by coagulation and regeneration, e.g. by wet spinning, is disclosed. The cellulose is transformed into a methylol derivative containing more than 2 units of formaldehyde per anydroglucosidic unit, which derivative is soluble in organic solvents of the class consisting of polar aprotic solvents constituted by N-substituted amides, pyridine and formamide. The methylol derivative is prepared by treating cellulose with paraformaldehyde and dimethylsulphoxide. The methylol derivative is then dissolved in one of the aforesaid solvents, preferably dimethylformamide or dimethylacetamide, to provide spinnable viscous solutions from which formed bodies can be obtained, e.g. by spinning in an aqueous alkaline bath.
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