摘要:
“The invention relates to a method for preparing a composite latex, including(a) a first step of free radical emulsion or microsuspension polymerization or copolymerization, leading to the production of a first polymer latex, and(b) a second step of free radical microsuspension, emulsion, or suspension polymerization or copolymerization in the presence of the first polymer latex obtained in the first step (a), characterized in that the first polymer forming the latex obtained in step (a) is a halogen-containing vinyl polymer and the polymer formed in step (b) is an associative copolymer, preferably compatible with the halogen-containing vinyl polymer, which contains units from a first monomer (A) and units from a second monomer (B) having at least one associative group; however the nature of both polymers are capable of being reversed. The invention also relates to a latex or polymer suspension obtained by said method and to a polymer composition obtained from the latter, as well as to the use of said latex, from said suspension or said polymer composition, for manufacturing rigid or plasticized materials.”
摘要:
The present invention relates to a method of preparing a polymer resin based on a halogenated vinyl polymer and a copolymer bearing associative groups, comprising the steps that consist in forming a latex of each of these polymers, blending said latices, then isolating and drying the polymers contained in said latices in order to form a pulverulent resin. The present invention also relates to said resin, to a pulverulent composition containing said resin, and also to the use of this composition for manufacturing rigid or plasticized materials.
摘要:
The present invention relates to a process for grafting an unsaturated monomer onto a fluoropolymer, having the steps of: a) melt blending the fluoropolymer with the unsaturated monomer; b) forming the blend obtained in a) into films, sheets, granules or powder; c) exposing the products from step b), in the absence of air, to photon (γ) or electron (β) irradiation with a dose of between 1 and 15 Mrad; and d) optionally treating the product obtained at c) in order to remove all or part of the unsaturated monomer that has not been grafted onto the fluoropolymer. Structures made with these materials are barriers to many fluids and in particular to petrol and to air-conditioning fluids and may be formed into bottles, tanks, containers, pipes, hoses and vessels of all sorts. They may also be converted into films with which packaging is made.
摘要:
The present invention relates to a process for grafting an unsaturated monomer onto a fluoropolymer, having the steps of: a) melt blending the fluoropolymer with the unsaturated monomer; b) forming the blend obtained in a) into films, sheets, granules or powder; c) exposing the products from step b), in the absence of air, to photon (y) or electron (β) irradiation with a dose of between 1 and 15 Mrad; and d) optionally treating the product obtained at c) in order to remove all or part of the unsaturated monomer that has not been grafted onto the fluoropolymer. Structures made with these materials are barriers to many fluids and in particular to petrol and to air-conditioning fluids and may be formed into bottles, tanks, containers, pipes, hoses and vessels of all sorts. They may also be converted into films with which packaging is made.
摘要:
The invention pertains to the field of PVC production. More particularly, the invention relates to a method for preparing a polymer including vinyl chloride monomers that are polymerized and grafted onto acrylic, styrene, and/or ethylene monomers polymerized in the form of an elastomer.
摘要:
The present invention relates to a process for oxidizing a fluoropolymer, comprising the steps of: a) forming a fluoropolymer is into a film, a sheet, granules or powder; b) exposing the products from step a), in the presence of oxygen, to photon (γ) or electron (β) irradiation with a dose of between 1 and 15 Mrad; and c) optionally treating the product obtained in b) in order to remove all or some of the by-product impurities. The oxidized fluoropolymer thus obtained may be used as such or in a blend with at least one polymer. Structures comprising at least one layer of this oxidized fluoropolymer and at least one layer of another material may be formed into bottles, tanks, containers, pipes, hoses and vessels of all sorts. They may also be converted into films with which packaging is made. The invention also relates to the oxidized fluoropolymer.
摘要:
Thermosetting Schiff base resins, their preparation and their applicationsre described.These thermosetting Schiff base resins can be defined as responding to the general formula: ##STR1## Radicals Ar.sub.1, Ar.sub.2 and Ar.sub.3 are chosen so that the softening temperature of the resins is less than about 150.degree. C.The resins can be prepared by direct condensation of an ethynyl benzaldehyde or acetophenone on a telechelic diamine oligomer obtained by reaction of a diamine containing flexibilizing groups on a derivative of benzhydrol tetracarboxylic acid. These Schiff base resins can be used by bulk thermal polymerization particularly to prepare adhesives or composite matrices.
摘要:
A subject-matter of the invention is a copolymer comprising at least 3 units, P1, P2 and P3, with the following general formulae: with X1, X2 and X3, which are identical or different, taken from the group of atoms consisting of H, F, Cl and Br; with R1 taken from the group of atoms consisting of H, F, Cl and Br; with R2 a carbonaceous group comprising from 1 to 10 partially or completely fluorinated carbon atoms; with Y1 and Y2, which are identical or different, taken either from the group of atoms consisting of H, F, Cl and Br or from the family of the carbonaceous groups comprising from 1 to 10 carbon atoms; with Y3 a carbonyl group or a divalent carbonaceous group; the content of P2 unit in the copolymer being between 30 and 70 mol % for respectively a content of P1 and P3 units in the copolymer of between 70 and 30 mol % and the weight-average molar mass (Mw) of the said copolymer being between 103 and 106 g/mol. Preferably, the copolymer is of CTFE/VCA/HFP or TFE/VCA/HFP type.
摘要:
The present invention relates to a structure comprising, in succession: a metal layer L1, optionally a fluorinated primer L2, which is a blend comprising, by weight, 1 to 100% of at least one modified fluoropolymer per 0 to 99% of fluoropolymer, respectively, and a layer of a fluoropolymer L3; such that, if the primer layer L2 is absent, the fluoropolymer L3 is a blend comprising, by weight, 1 to 100% of at least one modified fluoropolymer per 0 to 99% of fluoropolymer, respectively; the said modified fluoropolymer being chosen from: fluoropolymers grafted with an unsaturated monomer, the grafting being carried out in the absence of oxygen by irradiation of the unsaturated monomer and of the fluoropolymer that are melt-blended beforehand, and fluoropolymers irradiated in the presence of oxygen (also referred to as oxidized fluoropolymers). The structure is useful as a positive electrode for a lithium-ion battery.
摘要:
The polymer material is made from a first monomer and from a second monomer. The first monomer Ar includes at least one aromatic nucleus and the second monomer is a five links conjugated heterocyclic ring. The polymer material has the following general chemical formula: ##STR1## in which: X represents the group constituted by sulphur and selenium; R.sub.1 and R.sub.2 are chosen from the group constituted by hydrogen, and by the alkyl, alkoxyl, and hydroxyl groups; and n is the degree of polymerization. Such materials can be made conductive by adding a doping agent, and they can then be used for manufacturing electrodes, junctions, Schottky barriers, etc.