公开(公告)号：ZA801163B

公开(公告)日：1981-03-25

申请号：ZA801163

申请日：1980-02-29

Applicant: SNIA VISCOSA

Inventor： CAZZARO G ,  CAVALLARO A ,  SALAN A ,  MATERA G

IPC: C08J3/215 ,  D01F1/07 ,  D01F6/18 ,  D01F6/40 ,  D01F6/54 ,  C07C ,  C08F

Abstract: A method for preparing flame-resisting modacrylic fibers containing pentavalent antimony oxide is described wherein the antimony oxide is suspended in a mixture of water and an organic solvent selected from dimethylformamide and dimethylacetamide and the suspension is then mixed with the viscose solution of the modacrylic polymeric material to be spun. The process yield high luster, flame-resisting modacrylic fibre of the "L.O.I. uprated" type.

公开(公告)号：ZA785914B

公开(公告)日：1979-09-26

申请号：ZA785914

申请日：1978-10-20

Applicant: SNIA VISCOSA

Inventor： CAVALLARO A ,  MALGERI D ,  CAZZARO G ,  MATERA G

IPC: D01F6/38 ,  D01F6/54 ,  C08F ,  C07C

公开(公告)号：NO134151C

公开(公告)日：1976-08-25

申请号：NO296273

申请日：1973-07-20

Applicant: SNIA VISCOSA

Inventor： SIOLI G ,  GIUFFRE L ,  RIGHI F ,  MATERA G

IPC: C07C51/56

公开(公告)号：NO134150C

公开(公告)日：1976-08-25

申请号：NO65171

申请日：1971-02-23

Applicant: SNIA VISCOSA

Inventor： SIOLI G ,  GIUFFRE L ,  RIGHI F ,  MATERA G

IPC: C07D239/42 ,  B01J31/00 ,  C07B61/00 ,  C07C45/00 ,  C07C45/89 ,  C07C49/88 ,  C07C51/00 ,  C07C61/09 ,  C07C67/00 ,  C07D307/89 ,  C07C45/18

Abstract: A method is disclosed for the preparation of alicyclic ketenes, useful as intermediates in the preparation of lactams. The instant method consists in a heat treatment of an alicyclic acid, or its anhydride, in a matallic reactor exempt from nickel, at high temperatures but under subatmospherical pressures. A catalyst of the type XP(OR)3 wherein X is selected from the group consisting of oxygen, sulphur and selenium and R is an alkyl radical is preferred for accelerating the reactions. The temperatures are in the range from 550 DEG to 750 DEG C and the preferred pressure is under 100 millimeters of mercury. High yields and conversion rates are obtained and the purity of the end product is more than satisfactory. The method can be applied to the preparation of a number of alicyclic ketenes.