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公开(公告)号：US4158091A
公开(公告)日：1979-06-12
申请号：US870148
申请日：1978-01-17
申请人： Pierino Radici , Sergio Custro , Mario Ermoni , Paolo Colombo
发明人： Pierino Radici , Sergio Custro , Mario Ermoni , Paolo Colombo
CPC分类号： C08G2/36
摘要： The thermal and chemical stability of etherified acetal homopolymers is improved by heat-treating the latter in the molten state at a temperature of at least 180.degree. C., in the presence of a halide of an alkali or alkaline earth metal, until substantially complete degradation of the unstable polyoxymethylene chains.
摘要翻译： 醚化的缩醛均聚物的热和化学稳定性通过在熔融状态下在至少180℃的温度下，在碱金属或碱土金属的卤化物的存在下热处理，直到基本上完全降解 的不稳定聚甲醛链。
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公开(公告)号：US4097453A
公开(公告)日：1978-06-27
申请号：US642811
申请日：1975-12-22
申请人： Pierino Radici , Sergio Custro , Paolo Colombo
发明人： Pierino Radici , Sergio Custro , Paolo Colombo
摘要： The unstable terminal hydroxyl groups of acetal polymers are etherified in a liquid reaction medium in the presence of organic additives.
摘要翻译： 在有机添加剂存在下，缩醛聚合物的不稳定末端羟基在液体反应介质中醚化。
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公开(公告)号：US4105638A
公开(公告)日：1978-08-08
申请号：US751299
申请日：1976-12-16
申请人： Pierino Radici , Sergio Custro , Mario Ermoni , Paolo Colombo
发明人： Pierino Radici , Sergio Custro , Mario Ermoni , Paolo Colombo
IPC分类号： C08G2/36
CPC分类号： C08G2/36
摘要： An etherified acetal homopolymer is stabilized by heat-treating said homopolymer suspended in a liquid diluent chosen from water or mixtures thereof with polar organic compounds, preferably in the presence of a basic compound, at a temperature of 100.degree.-160.degree. C and below the melting point of the homopolymer, thereby to substantially degrade the unstable fraction of said homopolymer.
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公开(公告)号：US4268643A
公开(公告)日：1981-05-19
申请号：US088250
申请日：1979-10-25
申请人： Pierino Radici , Sergio Custro , Paolo Colombo
发明人： Pierino Radici , Sergio Custro , Paolo Colombo
摘要： The terminal hydroxyl groups of an acetal polymer are esterified or etherified by reaction with an end-capping agent chosen from anhydrides of carboxylic acids, orthoesters and orthocarbonates, by forming an intimate mixture of polymer in powder form and liquid end-capping agent, the amount of said agent in the mixture being less than that which results in loss of the free-flowing characteristics of the powder, and reacting said mixture under stirring at 50.degree.-170.degree. C.
摘要翻译： 通过与选自羧酸，原酸酯和原碳酸酯的酸酐的封端剂反应，通过形成粉末形式的聚合物和液体封端剂的紧密混合物，缩醛聚合物的末端羟基被酯化或醚化， 所述混合物中的所述试剂的摩尔比小于粉末的自由流动特性的损失，并且在搅拌下使所述混合物在50-170℃下反应。
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公开(公告)号：US3998791A
公开(公告)日：1976-12-21
申请号：US605949
申请日：1975-08-19
申请人： Pierino Radici , Sergio Custro , Paolo Colombo
发明人： Pierino Radici , Sergio Custro , Paolo Colombo
CPC分类号： C08G2/34
摘要： Process for the stabilization of polyacetal resins having terminal hydroxyl groups, which comprises reacting a reagent capable of etherifying the hydroxyl groups with the polyacetal resins suspended in a reaction medium that is liquid under the conditions used, the said reaction medium consisting of at least one substance that is a solvent for the polymer and at least one substance that is a non-solvent for the polymer, the said solvent and non-solvent substances being completely miscible at the reaction temperatures but immiscible or partly miscible at temperature substantially lower than the reaction temperatures, and carrying out the operation in the presence of catalytic quantities of one or more compounds selected from the groups consisting ofA. strong or medium-strong mineral acids whose acid dissociation constant or first acid dissociation constant is higher than 10.sup..sup.-7 ;B. strong or medium-strong oganic acids whose acid dissociation constant is higher than 10.sup..sup.-6 ;C. alkyl, cycloalkyl, or alkylaromatic esters of strong or medium-strong mineral acids;D. alkyl, cycloalkyl or alkylaromatic esters of strong or medium-strong organic acids.
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公开(公告)号：US4160789A
公开(公告)日：1979-07-10
申请号：US734932
申请日：1976-10-22
申请人： Pierino Radici , Gaudenzio Bianchi , Paolo Colombo
发明人： Pierino Radici , Gaudenzio Bianchi , Paolo Colombo
IPC分类号： C08G2/00 , C08G2/38 , C08G63/664
CPC分类号： C08G2/38 , C08G63/664
摘要： Block copolymer of the structure A-B wherein:A is a polylactone block of recurring units: ##STR1## wherein PM is a linear polymethylene chain having from 2 to 13 carbon atoms,B is a polyoxymethylene block of recurring units --CH.sub.2 O--. The block copolymer contains at least 2 wt.% of block B and at least 0.1 wt.% of block A.The block copolymer can be used as modified polyacetal when rich in block B, or as special additive for plastics materials when rich in block A.
摘要翻译： 结构A-B的嵌段共聚物，其中：
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公开(公告)号：US4003960A
公开(公告)日：1977-01-18
申请号：US642810
申请日：1975-12-22
CPC分类号： C08G2/38
摘要： Block copolymer of the structure A-B, wherein: ##STR1##A is a polylactamic block of recurring units: t,0010 WHEREIN PM is a linear polymethylene chain having from 3 to 13 carbon atoms,B is a polyoxymethylene block of recurring units [CH.sub.2 O]. The block copolymer contains at least 2 wt.% of block B and at least 0.05 wt.% of block A.The block copolymer can be used as technopolymer when rich in block B, or in the field of yarns and molded products when rich in block A.
摘要翻译： 结构A-B的嵌段共聚物，其中：A是重复单元的聚乳酸嵌段：
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8.发明授权
公开(公告)号：US4000217A
公开(公告)日：1976-12-28
申请号：US642825
申请日：1975-12-22
申请人： Pierino Radici , Daniele Colombo , Paolo Colombo
发明人： Pierino Radici , Daniele Colombo , Paolo Colombo
摘要： Polyoxymethylene is prepared by feeding anhydrous formaldehyde into a reaction medium containing a liquid organic diluent non-solvent for the polyoxymethylene and non-reactive towards the other constituents of the reaction medium, and containing in a dispersed form a polymer A carrying a terminal ionic couple on its macromolecular chain, said polymer A being a polylactamic block of recurring units ##STR1## wherein PM is a linear polymethylene chain having from 3 to 13 carbon atoms, and being present in a proportion of from 0.001 to 0.1% by weight with respect to the polyoxymethylene.
摘要翻译： 描述了一种方法，其中进料到含有待获得的聚甲醛的惰性有机稀释剂或非溶剂的反应介质的无水单体甲醛在分散在反应介质中的催化量的催化剂存在下聚合，并由 下式的内酰胺单体的离子聚合的产物：其中m是3至13的整数，其中亚甲基的一个或多个氢原子可以被烷基，烷基芳基，环烷基或芳基取代 ，催化剂的分子量为1000〜50,000。 作为内酰胺的实例，可以提及ε-己内酰胺，α-吡咯烷酮，ω-月桂内酰胺，α-哌啶酮和ω-内酰胺。 所显示的主要优点是获得的内酰胺的分子量分散性显着降低。
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9.发明授权
公开(公告)号：US4000215A
公开(公告)日：1976-12-28
申请号：US639139
申请日：1975-12-09
申请人： Pierino Radici , Paolo Colombo , Roberto Croce
发明人： Pierino Radici , Paolo Colombo , Roberto Croce
摘要： Polyoxymethylene is obtained in a stabilized form by polymerizing formaldehyde in a liquid organic diluent containing in a dispersed form a catalyst-stabilizer consisting of a polylactamic polymer carrying a terminal ionic couple on its macromolecular chain, said catalyst-stabilizer being present in an amount of from 0.1 to 5 parts by weight for each 100 parts of polyoxymethylene.
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公开(公告)号：US3979479A
公开(公告)日：1976-09-07
申请号：US533267
申请日：1974-12-16
CPC分类号： C08G2/38 , C08G63/6852 , C08G69/44
摘要： A novel block copolymer HO--D--A--B--D--H, whereinA is a polylactonic block of recurring units ##EQU1## B is a polylactamic block of recurring units ##EQU2## C is a polyoxymethylene block of recurring units--CH.sub.2 O--is prepared by catalytic polymerization of at least one lactone ##EQU3## with at least one lactam ##EQU4## wherein: PM.sub.1 and PM.sub.2 are polymethylene linear chains having from 2 to 13 and 3 to 13 carbon atoms, respectively, and being either non-substituted or having at least one hydrogen atom replaced by an alkyl, aryl, alkylaryl or cycloalkyl radical, and reaction of the resulting A-B copolymer with monomeric formaldehyde.The block copolymer HO--D--A--B--D--H having a preponderant percentage in blocks A, B or D, respectively, behaves as a polylactone, polylactam or polyformaldehyde, respectively, having improved properties.
摘要翻译： 一种新的嵌段共聚物HO-DABDH，其中A是重复单元的聚乳酸嵌段-C（PM1）-O-- PARALLEL OB是重复单元的聚乳酸嵌段-C-（PM2）-N-- PARALLEL | OH C是重复单元-CH 2 O-的聚甲醛嵌段，其通过至少一种内酯（PM1）|| CO-O |与至少一种内酰胺（PM2），|| || | CO- -NH|其中：
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