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公开(公告)号：US4393016A
公开(公告)日：1983-07-12
申请号：US297172
申请日：1981-08-28
CPC分类号： C08J9/143 , C08J2325/04 , Y10S264/05 , Y10S264/13
摘要： In a process for producing a plate-like polystyrene resin foam which comprises extruding a molten mixture consisting of a polystyrene resin and a volatile blowing agent by an extruder into a zone having a lower pressure than the inside of the extruder; the improvement wherein said volatile blowing agent is a mixture consisting of dichlorodifluoromethane, ethyl chloride and methyl chloride in which dichlorodifluoromethane accounts for 50 to 70% by weight of the mixture and the remainder consists of ethyl chloride and methyl chloride and the amount of ethyl chloride is at least 30% by weight based on the total amount of ethyl chloride and methyl chloride; and wherein said volatile blowing agent is present in said molten mixture in a proportion of 8 to 17 parts by weight per 100 parts by weight of the polystyrene resin component.
摘要翻译： 在制造板状聚苯乙烯树脂泡沫的方法中，其包括通过挤出机将由聚苯乙烯树脂和挥发性发泡剂组成的熔融混合物挤出到压力低于挤出机内部的区域中; 其中所述挥发性发泡剂是由二氯二氟甲烷，氯乙烷和氯甲烷组成的混合物，其中二氯二氟甲烷占混合物重量的50-70％，其余由氯乙烷和氯甲烷组成，氯乙烷的量为 至少30重量％，基于乙基氯和氯甲烷的总量; 并且其中所述挥发性发泡剂以每100重量份聚苯乙烯树脂组分8至17重量份的比例存在于所述熔融混合物中。
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公开(公告)号：US4451417A
公开(公告)日：1984-05-29
申请号：US450218
申请日：1982-12-16
CPC分类号： C08J9/143 , B29C44/50 , B29K2025/00 , B29L2007/002 , C08J2325/04 , Y10S264/05
摘要： In a method of producing a plate-like polystyrene resin foam which comprises extruding a molten mixture of a polystyrene resin and a volatile blowing agent from an extruder into a zone kept at a lower pressure than the inside of the extruder, the improvement wherein the volatile blowing agent is a mixture consisting of 50 to 80% by weight of dichlorodifluoromethane and 50 to 20% by weight of ethyl chloride and is present in said molten mixture in a proportion of 8 to 17 parts by weight per 100 parts by weight of the polystyrene resin.
摘要翻译： 在制造板状聚苯乙烯树脂发泡体的方法中，其包括从挤出机将聚苯乙烯树脂和挥发性发泡剂的熔融混合物挤出到保持在比挤出机内部更低的压力下的区域，其中挥发性 发泡剂是由50至80重量％的二氯二氟甲烷和50至20重量％的乙基氯组成的混合物，并且以每100重量份聚苯乙烯重量计8至17重量份的比例存在于所述熔融混合物中 树脂。
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公开(公告)号：US4260572A
公开(公告)日：1981-04-07
申请号：US40086
申请日：1979-05-17
CPC分类号： C08J9/0061 , C08J9/0014 , C08J9/143 , C08J2325/06 , C08J2425/00 , Y10S264/05
摘要： A foamed polystyrene board useful as a thermal insulating material is produced by melting a polystyrene having a melt index of from 0.5 to 5 under heat in an extruder, mixing the molten mass with a blowing agent composed of methyl chloride and dichlorodifluoromethane, and extruding the resulting foamable molten gel from the extruder. As a novel essential feature, a flowability improver having a melting point higher than 70.degree. C., such as an aromatic sulfonamide, a brominated aromatic compound, a brominated alicyclic compound or a poly(.alpha.-methylstyrene), is mixed with the polystyrene within the extruder to impart superior extrusion formability. The foam has good dimensional stability both at room temperature and higher temperature, high mechanical strength and superior thermal insulation properties.
摘要翻译： 用作绝热材料的发泡聚苯乙烯板通过在挤出机中在加热下熔融熔体指数为0.5至5的聚苯乙烯熔融而制得，将熔融物料与由氯甲烷和二氯二氟甲烷组成的发泡剂混合，并将所得的 来自挤出机的可发泡熔融凝胶。 作为新的基本特征，将熔点高于70℃的流动性改进剂如芳族磺酰胺，溴化芳族化合物，溴化脂环族化合物或聚（α-甲基苯乙烯）与聚苯乙烯混合 该挤出机具有优异的挤出成型性。 该泡沫体在室温和较高温度下具有良好的尺寸稳定性，高机械强度和优异的隔热性能。
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公开(公告)号：US4255371A
公开(公告)日：1981-03-10
申请号：US3540
申请日：1979-01-15
CPC分类号： C08J9/0023 , B29C44/56 , C08J9/06 , C08J2323/02 , Y10S264/18
摘要： In a process for producing an olefinic resin foam which comprises the steps of forming a composition comprising an olefinic resin, a chemical blowing agent and a crosslinking agent into an unfoamed sheet-like or rod-like shaped article and foaming it by heating, the improvement wherein the heat-forming step is carried out in an oxygen-free atmosphere or in an atmosphere containing not more than 10% of oxygen.
摘要翻译： 在制备烯烃树脂发泡体的方法中，其包括以下步骤：将包含烯烃树脂，化学发泡剂和交联剂的组合物形成到未发泡的片状或棒状成形制品中并通过加热使其发泡， 其中，所述发热步骤在无氧气氛或不超过10％的氧的气氛中进行。
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