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公开(公告)号：DD134533A5
公开(公告)日：1979-03-07
申请号：DD20370078
申请日：1978-02-14
Applicant: STAMICARBON
IPC: C08F8/00 , C08F8/20 , C08F8/22 , C08F110/02
Abstract: An improved process for chlorinating high density polyethylene "in bulk" is described, with a two-stage reaction, the first at temperatures below the crystalline melting point, and the second above that temperature, and using a polyethylene starting material having a critical combination of characteristics, as described.
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公开(公告)号：CA1098249A
公开(公告)日：1981-03-24
申请号：CA296889
申请日：1978-02-15
Applicant: STAMICARBON
IPC: C08F8/00 , C08F8/20 , C08F8/22 , C08F110/02 , C08F10/02
Abstract: An improved process for chlorinating high density polyethylene "in bulk" is described, with a two-stage reaction, the first at temperatures below the crystalline melting point, and the second above that temperature, and using a polyethylene starting material having a critical combination of characteristics, as described.
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公开(公告)号：CA1083298A
公开(公告)日：1980-08-05
申请号：CA250483
申请日：1976-04-20
Applicant: STAMICARBON
Inventor： SCHOEN LOEWHARDT A A , BRULS WILHELMUS G M , DEBETS WILHELMUS A M
Abstract: Vinyl chloride polymers are chlorinated in a dry, two-step process including treating particulate vinyl chloride with gaseous chlorine at temperatures in the range of -20.degree.C to +150.degree.C, preferably 20-25.degree.C and without the use of radical-forming initiators or radiation for at least about 30 minutes, then increasing the temperature of the reaction to at least 70.degree.C until thermal radical formation occurs. In the second step the temperature is maintained below the point where the vinyl chloride is apt to agglomerate or discoloration occurs. This process avoids the use of liquid systems and provides a final product in a dry powder form having an increased dimensional stability.
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